PTC-Resistor-Relay Type MS40ZT
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.
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)
< 4000 Ω
1 change-over contact (co)
type of contact
type 2 (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