Siemens 3RP25

Description
3.6 Area of application
3RP25 Time Relays
20 Manual, 09/2019, A5E31947765002A/RS-AC/003
3.6 Area of application
Functions
Time relays with ON-delay
● Interference pulse suppression (gating of interference pulses)
● Gradual startup of motors so as not to overload the power supply
Time relays with OFF-delay
● Generation of overtravel functions following removal of voltage
● Gradual, delayed shutdown, e.g. of motors or fans to allow a plant to be shut down
selectively
Star-delta (wye-delta) time relay
● Motor changeover from star (wye) to delta with a changeover delay of 50 ms to prevent
interphase short-circuit
Multifunction time relays
● Maximum flexibility, with a device for every application
Additive ON-delay, instantaneous OFF with control signal
● e.g. for the control of cyclical machine lubrication operations dependent on operating
hours
Flasher relay, symmetrical, starting with pulse
● Gradual adjustability of longitudinal feed on punching/embossing machines
Pulse-delayed relay
● Time relay with which the timing period starts when the control supply voltage is applied
and the output briefly switches to the working position after expiry of the set time delay
Pulse-delayed relay with control signal
● Time relay with which the timing period starts when the supply voltage and the control
signal are applied, and the output briefly switches to the working position after expiry of
the set time delay