STWA4MH is a measuring transducer. It measures AC up to 60A and has an RS485 interface (Modbus RTU). The measured analog current value is made available as a digital signal and can be read by a PLC, an IPC or a master computer.The conductor to be measured is passed through an opening (Ø 11 mm). In case of small currents, the sensitivity of the current transducer can be increased by looping through the current-carrying conductor several times, e.g. double looping doubles the sensitivity. The measuring range of the STWA4MH is reduced by multiple looping. To measure currents of any size, the STWA4MH is simply looped into the secondary circuit of a large current transformer with a secondary output of 5A (lead the cable through STWA4MH several times).Application:The STWA4MH enables the space-saving an cost-effective measurement of the actual value of an alternating current. Compared to transducers with analog output, the bus technology significantly  reduces the effort for the hardware (inputs) and the wiring. Applications are e.g. the recording of the current consumption of electrical motors in processing machines. Here the feed can be regulated depending on the load on the motor. Another example is the monitoring of consumers, e.g. heating elements, for failure.

PTC-relay for the application as a protection device against inadmissible heating up at electrical equipment in areas with explosive gases (zones 1 and 2) and areas with combustible dust (21 and 22), e.g. for direct temperature-monitoring of explosion-proof motors EEx e and EEx d. Vertically arranged terminals. Each terminal remains accessible even if all others are already occupied.Changes from T222471 to T228130: Version with spring terminals RoHS/REACH compliantChanges from T222476 to T228138: Version with spring terminals RoHS/REACH compliantChanges from T222475 to T228134: Version with spring terminals RoHS/REACH compliantFurther information can be found in our customer information: "New terminals for K-type devices"FeaturesATEX approval according to directive 2014/34/EUSIL 1 according to IEC 61508PL c according to ISO 138491 PTC-resistor (thermistor) set, each 3 or 6 PTC-sensorsshort-circuit monitoring of sensor-circuitoutput-relay with 1 or 2 change-over contacts (co)electronic reclosing lock (disconnectable)integrated RESET-buttonlink for external resetautomatic reset at voltage recoveryRESET-Button with integrated LEDs for power-ON (green) and ALARM (red)K-housing, vertically arranged terminals housing 22.5 mm wideassembly on DIN-rail or with 2 screws M4 (option)UL Recognized ComponentOption: other supply voltages 

The Pt100 thermostat TR250 monitors up to 3 sensors Pt100 (RTD), Pt1000, KTY83 KTY84 or thermistors (PTC) at the same time. Different types of sensors, e.g. Pt 100 and PTC can be monitored simultaneously.The unit is especially suitable for monitoring motors, generators and transformers.An other application is the use as a 2- or 3-step-controller with additional monitoring of over- or under-temperature. monitoring of differences in temperatures of 2 sensors  or  temperature controller for heat pumps. FunctionMeasuring an dmonitoring range -199...+850 °CResolution 0.1 °C for measuring range –19.9...99.9 selectable3 relay-outputs K1 to K3 with change-over-contactsUniversal power-supply AC/DC 24-240 VEasy settingStoring of values of MIN- and MAX temperatureAlarm counter for 3x99 alarms with display of sensor and elapsed timeCode-lock against manipulation of settingsReplacement for Elbag/Joppich TS-023 Sensor inputs: Pt 100 (RTD) or Pt 1000, 2- or 3-wire-connection, KTY83, KTY84Thermistors (PTC) each 1...6 in seriesMonitoring of short-circuit and breakDisplays:3 digit 7 segment display for temperature and programming3 LEDs for sensors, for alarms/relaysdisplay °C or °F selectable, resolution 0.1 °CSwitching functions:3 relayswarmest/coldest sensor switches relay3 LEDs for alarm/relayprogrammable for every relay:hysteresisautoreset or electronic reclosing lockdelay time for switching and switching backoperating- or closed current-modecyclic check of functionmonitoring of difference in temperature6 preset programs:Motor /generator 3x Pt 100transformer with 3x Pt 100transformer with 2x PTC and 1x Pt 100transformer with 2x PTC / 3x PTC3 x 1 alarm per sensorAccessory: Front mounting kit type ER4Alternative: Temperature relay Type TR640IP

PTC-relay for the application as a protection device against inadmissible heating up at electrical equipment in areas with explosive gases (zones 1 and 2) and areas with combustible dust (21 and 22), e.g. for direct temperature-monitoring of explosion-proof motors EEx e and EEx d. Vertically arranged terminals. Each terminal remains accessible even if all others are already occupied.Changes from T222451 to T228114; T222455 -> T228115; T222445 to T228116: Version with spring terminals RoHS/REACH compliantFurther information can be found in our customer information: "New terminals for K-type devices"FeaturesATEX directive 2014/34/EUSIL 1 according to IEC 61508PL c according to ISO 138491 PTC-resistor (thermistor) set, each 3 or 6 PTC-sensorsshort-circuit monitoring of sensor-circuitoutput-relay with 1 or 2 change-over contacts (co)2 LEDs for ON and ALARMK-housing, vertically arranged terminals housing 22.5 mm wideassembly on DIN-rail or with 2 screws M4 (option)UL Recognized ComponentOption: other supply voltages 

ZIEHL PTC-resistor relays protect motors, transformers, machines and equipment against thermal overload. With ZIEHL PTC Sensors MINIKA ® applied they offer best solutions for nominal response temperatures 60°C…180°C.ZIEHL PTC-resistor relays are designed for PTC-sensors according to DIN 44081 and DIN 44082. Therefor sensor and relays are exchangeable. PTC-resistor sensors are suitable for the installation into windings of electrical machines, bearings and transformers as well as to monitor the temperature of liquid media, airflow and gases.Used in conjunction, they provide a effectively and reliable protection in case ofblocking rotors, heavy starts, countercurrent operationundervoltage and phase failureincreased ambient temperature and hindered coolingReplaces the following items:  MS220K: T221741, T221743, T221761, T221765 and T221749MSR220K: T221771 and T221775Functional overview1 PTC-resistor set with up to 6 PTC-sensors (250O), or bimetal contacts in seriesoutput relay with 1 or 2 change-over contact (co)operating status display with LEDK-Housing, vertical terminal orderwidth 22.7 mmsnap mounting on 35 mm standard DIN rail or screw mountingelectronic reclosing lock (disconnectable)integrated RESET-buttonlink for external RESETautomatic RESET at voltage recoveryLEDs for power ON (green) and ALARM (red) in reset-buttonUL recognized componentOption: other supply voltagesVersion with spring terminals RoHS/REACH compliantFurther information can be found in our customer information: “New terminals for K-type devices” 

This compact device is the smallest version of all our PTCresistor relays.terminals outsideprotection terminals IP 20Relays 1 change-over-contact (co)Replacement for foreign device Zeidler TÜS 

Temperature Relays TR660IP monitor up to 6 sensors for up to 7 limits. Different sensors can be connected at the same time, e.g. Pt 100 (RTD) and PTC thermistors. Typical applications are monitoring of motors, generators or transformers. An other application is the use as a two or more step controller with additional monitoring of over- or undertemperature or monitoring of differences in temperatures of 2 sensors.Preset programs allow easy setting e.g. monitoring of transformers with/without monitoring of temperature of core or with/without controlling a ventilator.If the evaluation "2 out of x" is activated with several connected sensors, an alarm is only triggered when the limit value is exceeded in 2 sensors. This prevents false alarms due to a fault in one sensor. Operation can be made at the device or with a standard browser via Ethernet.6 inputs for sensors Pt 100, Pt 1000 and PTC, mixed sensors possible7 alarms / relay outputsalarm 2 of x = alarm only when limit is exceeded in min. 2 sensorsmonitoring of difference of temperaturesmonitoring of rate of change of temperaturelogging of temperatures and historypreset programs for protection of motors, transformers and moreinterface ethernet TCP/IP, values available via modbus TCPprogramming with browser via TCP/IP or with joystick at devicecoloured LED display for clear display of temperatures and states of alarmsuniversal power supply AC/DC 24-270 VAccessory: Installation frame ER8 for panel mountTR660IP RS485:  interface RS485 (modbus RTU)TR660IP analog:  4 analog outputs 2x 0/4 - 20 mA and 2x 0/2 - 10 V, isolated from sensor inputs, individually programmable. 

Attention: Discontinued model - remaining stock available.We recommend the following devices as alternatives: Characteristics TR640IP TR660IP Sensors PTC, PT100, PT1000 PTC, PT100, PT1000 Number of sensor inputs 6 6 Outputs 4x alarm relay 6x alarm relay, 2x analog (only T224370) Alarm type Threshold value, difference, rate of change, 2 out of X Threshold value, difference, rate of change, 2 out of X Display Display, LED Display, LED Parameterization Joystick, web interface Joystick, web interface Network / Communication Ethernet RS485, Ethernet Other functions Switch-on and switch-off delay, simulation, cyclic relay test, 2 digital inputs Switch-on and switch-off delay, simulation, cyclic relay test, 2 digital inputs Housing design V6 V8 Main areas of application Extended monitoring for motors, Transformers, differential monitoring Additional alarms, analog outputs, versatile application in all industrial sectors Description TR600:The Pt 100 thermostat TR600 is a temperature controller and monitors up to six Pt 100 sensors at the same time. Six switching points and six relays allow almost any combination of switching action. It can also select the highest temperature of a group of three or six sensors. The temperatures of two sensors or groups of sensors can be issued to two analog outputs i.e. for remote displays or further evaluation. Programming is very variable and simple.Due to the fact that 6 type Pt 100 sensors can be connected, the unit is especially suitable for temperature monitoring wherever up to 6 different measuring points must be monitored simultaneously:motors and generators with simultaneous monitoring of bearings and coolant.transformers with additional monitoring of the core temperature also.power machines and plantsApprovalUL E377414 Process Control Equipment, Electrical - ComponentOverview of functionsMeasuring and monitoring range -199 ... +800 °C6 sensor inputs with 2- or 3-wire connection7 relay outputs with change-over contactAlarm 1 … 6 relay K1 (11/12/14) ... K6 (61/62/64)Sensor Error Relay K7 (71/72/74) monitors sensor break or sensor short circuit.2 analog outputs, 0/4...20 mA and 0/2...10 V, with individual scaling.Universal power supply. 2 ranges AC/DC 24-60V or AC/DC 90-240 VUniversal power supply AC/DC 24-240 VTerminal for USB-Stick for up- and downloads of sets of parameters and for firmware-updatesAccessory: Installation frame ER8 for panel mount 

Phase-sequence relays DRR10 measure the sequence of the phases when being switched on and switch - if necessary - the rotation of the field by changing 2 phases.The integrated PTC-monitor protects the motor from overheating.Applications are especially machines and equipment, that is operated at variable locations e.g. at building sites. Pumps, compressors and vacuum cleaners always run correctly. Nomore search for faults or change of wiring necessary.Overview of Functionautomatic change of wrong phase-sequence when connected falselyrunning backward of motors is avoidedintegrated PTC-protection for motorenable-input for direct switching on/off of the motor with DRR 10max. 3 x 12 Aswitch-on currents 30 A / max. 4 s / 60 A / max. 1 shigher currents with external contactorsintegrated protection for relay contactsintegrated protection from over-temperaturehousing for mounting in fuse-boxes or switchgearcabinets, mounting height 55 mm

Temperature relay to protect transformers against excess temperature and to control a fan.The temperatures in the windings are monitored with three Pt 100 sensors. The core temperature can be monitored with a fourth sensor.The 4 alarms/output relays are used to control the fan, to signal an advance warning and to switch-off the transformer. Various programs facilitate using the alarm ideally for each application. Depending on the program, e.g. an extra relay is available for the fault message or for triggering due to exceeding the maximum core temperature.Other usesAlternatively, with the fourth sensor the temperature of the room the transformer is located in can be monitored and, with the alarm, the room ventilation can be controlled. The device can also be used for other tasks for temperature monitoringe.g., for motors.Overview of the functions4 Sensor inputs Pt 100 (RTD), 2 or 3-wire connectionLarge monitoring range -199…+850°C / -199...+999°F4 Alarms / Relays3-digit digital display (resolution 1°C / 1°F)4 LEDs sensor4 LEDs relay4 LEDs alarm1 LED errorControl voltage AC/DC 24-240 VClear displays and simple programmingMin and max sensor values can be savedCode lock against unintended / unauthorised changes to the settingsOptional RS 485 interface with Modbus RTU protocolEasySimulation for simple sensor value simulation 

ZIEHL PTC-resistor relays protect motors, transformers, machines and equipment against thermal overload. With ZIEHL PTC Sensors MINIKA ® applied they offer best solutions for nominal response temperatures 60°C…180°C.ZIEHL PTC-resistor relays are designed for PTC-sensors according to DIN 44081 and DIN 44082. Therefor sensor and relays are exchangeable. PTC-resistor sensors are suitable for the installation into windings of electrical machines, bearings and transformers as well as to monitor the temperature of liquid media, airflow and gases.Used in conjunction, they provide a effectively and reliable protection in case ofblocking rotors, heavy starts, countercurrent operationundervoltage and phase failureincreased ambient temperature and hindered coolingThe MSR220K2 monitors 2 PTC resistor sets at the same time. If a temperature rise occurs in one set, the appropriate output relay releases. With this relay, 2 PTC-sets can be independently monitored. Functional overview2 PTC-resistor sets, each 1...6 PTC resistors, or bimetal contactsoutput relays 2 x 1 change-over contact (co)LEDs for operation and alarmelectronic reclosing lock (disconnectable)integrated RESET-buttonlink for external RESETautomatic RESET at voltage recoveryUL-Recognized Component  ATTENTION:Replacement item for T221923 AC/DC 24V = T221943: Version with reset functionReplacement item for T221925 AC 230V = T221945: Version with reset function

Web-IO universal limit value relay with Ethernet interface, built-in web server and 8 inputs for temperature sensors or other analog signals. The UR840IP can be connected to the internet or an intranet and operated via TCP/IP from a normal PC with a suitable browser.The device can simultaneously evaluate and monitor up to 8 different input signals. Each of the 4 output relays can be assigned up to 8 limit values, one per input. If a limit value is reached, an alarm is triggered and a relay switches. Example: Alarm 1 is activated when a temperature is exceeded at sensor input 3 (e.g. Pt 100) or the signal from a pressure transmitter (e.g. 4-20 mA) at input 5 falls below a limit value. The device also has an RS485 interface (Modbus RTU) or analogue outputs 0/2-10 V or 0/4-20 mA.Accessory: Installation frame ER8 for panel mount ApplicationsThe UR840IP is used where one or more of the following features a required:The UR840IP is used to advantage wherever the following features are requiredmonitor up to 8 different analogue measured values and transfer them to the InternetMeasured value query and remote maintenance via intranet/internet Discover the difference between our TR800Web and the new UR840IP! Features TR800Web UR840IP Inputs 8 analog inputs 8 analog inputs, 4 digital outputs Sensors Pt100, Pt1000, KTY83/84, thermoecouples (Type B, E, J, K, L, N, R, S, T), DC 0-10 V, DC 0/4-20 mA, resistance 0-500 Ohm, 0-30 kOhm Pt100, Pt1000, PTC, thermocouples (Type B, E, J, K, L, N, R, S, T), DC 0/2-10 V, DC 0/4-20 mA, resistance 0-500 Ohm, 0-30 kOhm Alarms 4 relays, programmable, E-mail notification in the event of alarms 4 relays, programmable, Alarm triggering of 2 of x sensors possible Interfaces Ethernet (HTTP, HTTPS, UDP, Modbus), RS485 (Modbus RTU, ZIEHL-protocol) Ethernet (HTTP, Modbus TCP), RS485 (Modbus RTU), 2 x analog outputs (1x voltage, 1x current) – optional RS485 or analog can be activate in the menu Web-Interface Operation and programming via web browser Operation and programming via web browser Data logging Up to 150.000 values per input, interval 2 seconds to 24 hours Per input, interval 10 seconds to 30 minutes Supply voltage AC/DC 24-240 V, 0/50/60 Hz, 4-13 VA AC/DC 24-240 V, 0/50/60 Hz, 4-11 VA Special features Day/night switchover for limit values, E-mail notification Joystick and LCD display for easy operation

The PTC-resistor relay MS 40 ZT monitors particularly engines at elevator cars and lifts. A pulse input monitors the movement of the elevator car as long as the motor is switched on.watchdog timing adjustable 5 - 50 s.temperature monitoring with PTC-resistorintegrated RESET-buttonLED for temperatur alarmLED for watchdog alarmAt elevator systems the temperature of the motor and the travelling motion have to be monitored. With the car at rest and contact between terminals 2 and 5 closed, the integrated relay picks up (terminals 8, 9 connected). The time monitoringstarts with the opening of the contact between terminals 2 and 5. Then the pulse input between terminals 3 and 6 must continously open and closeduring travelling motion. When the pulse stops or the nominal response temperature of the PTC-resistor is exceeded, the relay releases. Each disconnection is locked. A restart by pressing the RESET-button is only possiblewith closed contact between terminals 2 and 5 and low-resistive sensor.

Transducers for motor protection TMU300 are transducers for 1-3 sensors Pt100 (RTD). A new, current-saving measuringsystem makes it possible to evaluate 3 sensors with a transducer that is supplied by a loop 4-20 mA. This design is protected. The sensors Pt100 are connected in 2-wire-technique. The output signal is a current 4-20 mA. The value of the output current corresponds with the temperature of the hottest sensor.ApplicationRecording of temperatures at e.g. motors, generators, transformers or compressors and forward them to relais or controls for evaluation.In difference to PTC with sensors Pt100 a adjustable switching temperature can be realized. The temperature protection can be adapted to the requirements at any time. Optimal operation and longer life by intelligent management possible. E.g. no start at high motor temperatures. The cast-resign sealed electronics can be used at temperatures up to 85 °C and thus be placed near the sensors, e.g. in the terminal box of a motor. This reduces influence of EMC and line resistance. The signal 4-20 mA can be transmitted over long distances.Characteristicsconnection of 1-3 sensors Pt 100 in 2-wire-techniquemeasuring range 0...200 °Cautomatic selection of warmest sensorI < 3,5 mA at short circuit in any sensorI > 25 mA at interruption in any sensoranalog output 4-20 mArated ambient temperature up to 85 °Cno supply voltage required (supplied by 4-20 mA loop)with sealed-in electronics

Ziehl PTC thermistor relays protect motors, transformers, machines and equipment against thermal overload. These are according to DIN EN 60947-8 and are thus exchangeable. Used in conjunction with respective PTC thermistors they provide a reliable temperature protection in the temperature range 60 °C up to 180 °C.PTC-thermistors according DIN 44081 and DIN 44082 shall be connected. PTC thermistors are suitable for the installation into windings of electrical machines, bearings and transformers as well as to monitor the temperature of liquid media, airflow and gases. With ATEX approval, explosion-protected equipment in explosive gas atmospheres (marking G: gas) or in areas with combustible dust (marking D: dust) can be protected.FeaturesATEX directive 2014/34/EU1 circuit for 3 or 6 PTC thermistorsShort-circuit detection within the thermistor circuitOutput relay with 1 change-over contact (co)Operating status display with LEDelectronic reclosing lock (disconnectable)integrated RESET-buttonlink for external RESETautomatic RESET at voltage recoveryOperating status display with LED 

Relays for 3-phase networks type PSSW1 monitor 3-phase networks for phase-sequence, asymmetry and over- and undervoltage.ApplicationsMonitoring of 3-phase-networks at heat pumps, compressors or at machines at building sites.FunctionsOver- and undervoltage, adjustable ± 2-20 % (common)Asymmetry adjustable 5-15%Phase lossPhase sequenceSwitching delay adjustable 0,1-12 s (for voltage and asymmetry)Bifrequential measuring input 50/60 HzDisplays (4 LEDs for)Over-/undervoltageAsymmetryPhase-sequence/lossState of relay 

The MSR820V monitors up to 8 PTC-resistor-circuits at the same time. A common relay signals an alarm or an error in a sensorcircuit. The inputs can be enabled or disabled during operation. The MSR820V can also be used as a fault annuciator for collective reports.1-8 PTC-circuits, each 1…6 PTC in series (max. coldresistance 1500O/circuit)Easy activating/deactivating of PTC-circuits (display with LEDs)2 potential-free relay-outputs, display of switching state with LEDsDisplay of state of PTC-circuits with 2 LEDs per circuitElectronic reclosing-lock (disconnectible with bridge Y1-Y2)monitoring of contacts for collective fault-reportsProgrammable functions:– Monitoring of short-circuit of PTCs (OFF / ON)– External Reset as normally closed (nc) or open (no) contact (Y1, Y2)– Power-fail-safe reclosing lock (OFF / ON)– Function of relay:    – K1 and K2 closed-current mode    – K1 and K2 operating-current mode    – K1 closed- and K2 operating-current-modeUniversal supply-voltage AC/DC 24 – 240 VMounting on DIN-rail 35mm EN 60715 or wallmount (Option)Mounting height 55 mmAccessory: Installation Frame ER4 for panel mount

The current relay STW20V monitors the current in up to 3 lines with current transformers STWA 1 (AND circuit). If there is a current in all 3 monitored lines, the relay (2 change-over contacts) picks up. If there is no current in at least one of the lines, the relay releases.The relay works in closed circuit current. When voltage is applied to the STW, the relay signals an alarm until the it has picked up. This can be avoided if the device is constantly alive and monitoring is started by closing a contact at the Enable input. With a bridge at the Enable input, monitoring is automatically started when voltage is applied.3 inputs (transformer STWA1)3 x current-sensor S1 (powersupply required)AND-evaluationoutput relay 2 COswitching point app. AC 1 AEnable-inputstorage of alarms or Auto-ResetLEDs power on and alarm housing V4 for mounting on DIN-rail or wall-mountApplicationsIdentifies power failure with 1- or 3-phase electrical consumers, e.g. with monitoring of heating elements or heating installations where a constant heating has to be guaranteed.A further application is the identification of phase failure, monitoring of fuses, or triggering of operating hours counters.

Motor load monitors monitor motors for overload and/ or underload. They are simply wired into the motor supply line and evaluate the phase angle between the voltage and the motor current or, optionally, the active current. That facilitates monitoring drive motors which enables, for instance, detecting a break in a V-belt or the blockage of a filter or valve.As current directional relays, they monitor the direction of the flow of current to generators and whether current is being supplied or consumed.The digital display and many adjustment facilities allow optimising the device for each task. The resolution of the measuring input is 0.1 A. When using a current transformer, multiply this by the transformer factor.Cosfi application / Active currentV-belt monitoringFan monitoringPump monitoringConveying equipment (message if low is too low)StirrersWear monitoringTool wearLoad protection of motors, plants and drivesCurrent direction applicationWarning or shutdown if a generator is consuming instead of supplying currentIn an alternating current motor (inductive load), the current follows phase angle. If the load is decreasing, it increases so that the power factor (cosfi) decreases. This change of phase angle is a gauge of the change of the load on the motor. The COSFI 100 V motor load monitor is suitable for sinusoidal alternating current signals.Digital displays for the power factor (cosfi) and active currentInductive / capacitive load display2 limits / output relayEach adjustable for min, max, or min/maxMonitoring of 2 x cosfi, 2 x active current or 1 x cosfi and 1 x active currentCurrent display scalable (converter factor)Hysteresis and switching delay adjustableAuto-reset or locked shutdownRestarting attempts programmable 0…10Auto-enable via current (> 0.2A) or via start signal (open bridges E1 - E2)Auto-Enable (Strom) oder über StartsignalPower-on delay can be adjusted 0…99sCurrent input max. 10A through current transformer (sec. 5A) 999 AWire break in current measurement circuitPTC thermistor input with short-circuit detectionDistributor housing for panel mounting 4TE, front-to-back size 55mmMounting on 35mm DIN EN 60715 standard rail or with screws (optional)

Phase asymmetry relays PS2DK are used for the protection of electric motors against asymmetries in the 3-phase mains without neutral and for monitoring the phase-sequence.The switching-point is adjustable and can be adapted to the situation in the mains. If a motor, running with 2 phases, creates the 3rd phase, the sensitivity can be increased. With mains with high harmonics it can be necessary to reduce the sensitivity.When the sensitivity is reduced to minimum (25% = potentiometer turned fully right) , the device works as a phase-sequence relay. It trips only at wrong phasesequence or missing phase.If there is a wrong phase-sequence when switching on the device, the relay does not pick up.Monitoring of phase-asymmetryMonitoring of phase-sequenceAdjustable sensitivity 5…25 %Output-relay with 2 change-over contactsSwitching delay adjustable 0,1 … 5 sLED for display state of operationChanges from P222505 to P227105: Version with spring terminals RoHS/REACH compliantFurther information can be found in our customer information: "New terminals for K-type devices"

The current relay STW20K monitors the current in up to 3 lines with current transformers STWA1 (AND circuit). If there is a current in all 3 monitored lines, the relay (2 change-over contacts) picks up. If there is no current in at least one of the lines, the relay releases. The relay works in closed circuit current. When voltage is applied to the STW, the relay signals an alarm until the it has picked up.ApplicationsIdentifies power failure with 1- or 3-phase electrical consumers, e.g. with monitoring of heating elements or heating installations where a constant heating has to be guaranteed.A further application is the identification of phase failure, monitoring of fuses, or triggering of operating hours counters.If the switching threshold is not reached due to low currents of less than 1 A, the monitored wire should be led multiple times through the transformer. Not required inputs have to be connected to a occupied input.Features3 current transformers STWA1AND-evaluationrelay output 2 COSwitching point approx. AC 1 ALED-display for power on and alarmhousing design K

ZIEHL PTC thermistor relays protect motors, transformers, machines and equipment against thermal overload. Used in conjunction with respective PTC thermistors they provide a reliable temperature protection in the temperature range 60 °C up to 180 °C.PTC-thermistors according DIN 44081 and DIN 44082 shall be connected. PTC thermistors are suitable for the installation into windings of electrical machines, bearings and transformers as well as to monitor the temperature of liquid media, airflow and gases. With ATEX approval, explosion-protected equipment in explosive gas atmospheres (marking G: gas) or in areas with combustible dust (marking D: dust) can be protected.?FeaturesATEX directive 2014/34/EU1 circuit for 3 or 6 PTC thermistorsShort-circuit detection within the thermistor circuitOutput relay with 1 change-over contact (co)Operating status display with LED

Discontinued model - remaining stock available: Please contact our sales department: +49 791 504-103, sales@ziehl.deNEW: Universal Relay Type UR840IPView the numerous improvements and new functions, including:A revised web interface for more user-friendly operationVirtual sensors for linking measured values (difference, MIN/MAX)Two analogue outputs 0/2-10 V / 0/4-20 mA, parameterizable (optionally instead of RS485Expandable with our URB40Modbus TCP via RJ45 (network connection) The TR800Web can be connected to the internet or an intranet and operated via TCP/IP from a normal PC with a suitable browser. No special software and no special instruction is necessary. The Universal-Relay TR800Web monitors and logs signals from up to 8 inputs. Up to 8 limits (one per input) can be programmed for each of the 4 output-relays. Thus e.g. alarm 1 can be activated when the temperature at a sensor (e.g. Pt100) at input 1 exceeds a limit or when the signal of a transmitter for pressure (e.g. 4-20 mA) at input 5 falls below a limit. It can also send an email when a limit is exceeded and/or when the signals falls short of the limit again. A day/night switchover allows to vary limits depending on daytime. In addition the device has an interface RS485 with the protocols Modbus and ZIEHL-standard.Accessory: Installation frame ER8 for panel mountApplicationsThe TR800Web is used where one or more of the following features a required:measuring of up to 8 analog signals and transmit the data via TCP/IPreading of measured values and teleservice via internet/intranetsignalling of alarms via email when limits are exceededmonitoring of filling level (water, gasoil) with ZIEHL filling level probe NS6123-6logging of measured values and remote inquiry e.g. for monitoring temperatures at engines and in plants

Changes from T221741, T221743, T221761, T221765 to T228111: Version with spring terminals RoHS/REACH compliant. Further information can be found in our customer information: "New terminals for K-type devices"ZIEHL PTC-resistor relays protect motors, transformers, machines and equipment against thermal overload. With ZIEHL PTC Sensors MINIKA ® applied they offer best solutions for nominal response temperatures 60°C…180°C.ZIEHL PTC-resistor relays are designed for PTC-sensors according to DIN 44081 and DIN 44082. Therefor sensor and relays are exchangeable. PTC-resistor sensors are suitable for the installation into windings of electrical machines, bearings and transformers as well as to monitor the temperature of liquid media, airflow and gases.Used in conjunction, they provide a effectively and reliable protection in case ofblocking rotors, heavy starts, countercurrent operationundervoltage and phase failureincreased ambient temperature and hindered coolingFunctional overview1 PTC-resistor set with up to 6 PTC-sensors (250O), or bimetal contacts in seriesoutput relay with 1 or 2 change-over contact (co)operating status display with LEDK-Housing, vertical terminal orderwidth 22.7 mmsnap mounting on 35 mm standard DIN rail or screw mounting