MS40ZT, PTC-Resistor-Relay with time monitoring, AC 220-240 V, for elevators

MS40ZT, PTC-Resistor-Relay with time monitoring, AC 220-240 V, for elevators
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  • T221120
built-in time monitoring tN adjustable 5...50 s more

PTC-Resistor-Relay for elevators, with time monitoring


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-resistor
  • integrated RESET-button
  • LED for temperatur alarm
  • LED for watchdog alarm

At 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.


Technical Data

Rated supply voltage US


AC 220 - 240 V ±10 %, 50/60 Hz, 3VA


connectable PTC resistors


1... 6 PTC according to DIN VDE V 0898-1-401 (formerly DIN 44081/82)


switching point


< 4000 Ω


output relay


1 change-over contact (co)


type of contact


type 2 (see general technical informations)


test conditions


see general technical informations


rated ambient temperature range


-20... +55 ∞C


dimensions (h x w x d) attachment


design S 12: 82 x 42 x 121 [ mm ] on 35 mm DIN rail according to DIN EN 50 022 or with screws M4


protection housing / terminals


IP 30 / IP 20




approx. 280 g

Input / measuered parameter: Measuring input PTC, Digital input
Outputs: Alarms/relays
Design: Mount in switchgear cabinet
Extras: 1 sensor input
Applications: Protection of motors, Protection of pumps, Heat and power plants