Transformer protection temperature relay TR440

Pt100 Temperature-Relay,  protection of transformers,  4 Sensors Pt100, 4 Limits, Monitoring of core, fan control, Panel mount

Transformer protection temperature relay TR440

Part number

no interface RS485
Interface RS485

Product description

 

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 uses

Alternatively, 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 monitoring
e.g., for motors.

Overview of the functions

  • 4 Sensor inputs Pt 100 (RTD), 2 or 3-wire connection
  • Large monitoring range -199…+850°C / -199...+999°F
  • 4 Alarms / Relays
  • 3-digit digital display (resolution 1°C / 1°F)
  • 4 LEDs sensor
  • 4 LEDs relay
  • 4 LEDs alarm
  • 1 LED error
  • Control voltage AC/DC 24-240 V
  • Clear displays and simple programming
  • Min and max sensor values can be saved
  • Code lock against unintended / unauthorised changes to the settings
  • Optional RS 485 interface with Modbus RTU protocol
  • EasySimulation for simple sensor value simulation

 

Technical Data

Control voltage Us

.......

AC/DC 24 – 240 V, 0/50/60 Hz, <2 W < 4 VA

 

Limits

.......

DC 20.4 - 297 V
AC 20 - 264 V

 

Sensor connection

.......

Pt 100 according to EN 60751 (2/3-wire version)

 

Measuring range

.......

-199°C. 850°C / -199°F .. 999°F

 

Sensor resistance + line res.

.......

max. 500 Ohm

 

Sensor current

.......

≤ 0.7 mA

 

Measurement cycle/measurement time

.......

< 2.5 s

 

Tolerance

.......

± 1°C, ± 1 Digit

 

Temperature drift

.......

<0.04°C/K

 

Relay data K2, K3 and K4

.......

3 x 1 change-over contact

 

Switching voltage

.......

max. AC 415 V

 

Switching current

.......

max. 6 A

 

Switching capacity

.......

max. 2000 VA (Ohmic load)
max. 120 W at DC 24 V

 

Nominal operating current for reversing switch

.......

3 A AC15 250 V; 2 A DC13 24 V

 

Recommended series fuse

.......

3.15 A slow-to-blow ( gL )

 

Contact service life, mechanical

.......

3 x 107 operating cycles

 

Contact service life, electrical

.......

1 x 105 operating cycles at 240 V / 6 A

 

Reduction factor at cos ϕ 0,3

.......

0,5

 

Relay data K1

.......

1 reversing switch

 

Switching voltage

.......

max. AC 400 V

 

Conventional thermal current Ith

.......

max. 10 A

 

Inrush current (at 10 % ED)

.......

30 A max. 4 s

 

Nominal operating current Ie (AC 15)

.......

6 A AC 250 V

 

Recommended series fuse

.......

gG/gL 10 A

 

Contact service life, mechanical

.......

30 x 106 operating cycles

 

Contact service life, electrical

.......

1 x 106 operating cycles at AC 250 V / 6 A
2 x 105 operating cycles at AC 250 V / 10A cos ϕ 0,6

 

Test conditions (EN 50178 / EN 61010-1)

Rated impulse withstand voltage

.......

4000 V

 

Pollution level

.......

3

 

Rated insulation voltage Ui

.......

250 V

 

Operating time

.......

100 %

 

Permissible ambient temperature

.......

-40 °C ... +65 °C
EN 60068-2-2 dry heat

 

EMC compatibility

.......

EN 61000-6-2

 

EMC electrical interference

.......

EN 61000-6-3

 

Vibration resistance EN 60068-2-6

.......

2…25 Hz ±1.6 mm
25 ... 150 Hz5 g

 

Galvanic insulation

.......

Us – relays, sensors, (RS 485)  ..... DC 3820 V
relays – sensors, (RS 485)  ..... DC 3820 V

 

No Galvanic insulation (Only devices with RS 485 interface)

.......

RS 485 – sensors

 

Housing (Panel monitoring housing SE 2)

Dimensions (W x H x D)

.......

96 x 96 x 80 mm

 

Line connection single strand

.......

per 1 x 2.5 mm2

 

Finely stranded with wire end sleeve

.......

per 1 x 2.5 mm2

 

Housing internal protection

.......

Front panel IP 54 (with seal), rear IP 20

 

Terminal strip protection type

.......

IP 20

 

Mounting

.......

Panel mounting,
Cut-out 91+0.7 x 91+0.7 mm

 

Weight

.......

app. 310 g