PTC-Resistor-Relay Type MSR220K2

PTC-Thermistor-Relay, 2 PTC-circuits, with RESET

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Part number

AC 230 V
AC/DC 24 V


Product description


ZIEHL PTC-termistor 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 of

  • blocking rotors, heavy starts, countercurrent operation
  • undervoltage and phase failure
  • increased ambient temperature and hindered cooling

The 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 overview

  • 2 PTC-resistor sets, each 1...6 PTC resistors, or bimetal contacts
  • output relays 2 x 1 change-over contact (co)
  • LEDs for operation and alarm
  • electronic reclosing lock (disconnectable)
  • integrated RESET-button
  • link for external RESET
  • automatic RESET at voltage recovery
  • UL-Recognized Component


Technical data

Rated supply voltage Us


AC 230 V ± 10 %, 50/60 Hz ≤ 2 VA
AC/DC 24 V,  ± 10 % DC 21- 30 V < 2 VA,
without potential separation


Connectable PTC resistors


2 x 1...6 PTC according to DIN VDE V 0898-1-401 (formerly DIN 44081/82) or bimetal contacts (Klixon)


Switching point


< 4000 Ω


Output relay


2 x 1  change-over-contact (co)


Type of contact


Type 2 (see general technical information)


Test conditions


see general technical information


Rated ambient temperature


-20...+55 °C


Dimensions h x w x d


Design K: 75 x 22.5 x 115 [mm]




on 35 mm DIN rail according to EN 60 715 or screws M4 (option)


Protection Housing/Terminals






approx. 145 g




Operating manual