Siemens 3RP25 Manual page 21

Retriggerable interval relay with activated control signal and instantaneous contact
(watchdog relay)
● Cyclic monitoring of a start contact (dead man's circuit)
Supply voltage present at A1/A2. When the control signal is applied, the relay switches
immediately to the working position. The relay switches to idle after the set time
independently of the presence of the control signal (watchdog function). The time delay is
restarted each time the control signal is applied.
Retriggerable interval relay with deactivated control signal
● Time relay for which the output switches immediately to the working position when the
supply voltage is applied and the control signal is deactivated. The time starts and the
output switches to the idle position after the set delay has expired. The time function is
restarted each time the control signal is switched off.
ON and OFF-delay
● Closed-loop control (pre-travel and overtravel) of heating or cooling systems
Passing make contact
● Forced ventilation of rooms
● Stairwell lighting and elevator lighting
Passing break contact
● Emptying a conveyor belt / chip conveyor at end of process
3RP25 Time Relays
Manual, 09/2019, A5E31947765002A/RS-AC/003
Description
3.6 Area of application
21