Functioning
The application of control voltage S to the relay causes its activation and the resulting supply of voltage R to the controlled receiver. After decay of the control voltage, the operation of the receiving device is kept for the support time t (preset with the potentiometer). After the t time has been counted down, the controlled receiver is turned off automatically. If control voltage S is re-supplied before the lapse of the preset time, the relay will repeat its operational sequence.
Timing relays PO-415
On rail TH-35.
Lagged-pulse time relays are devised to support the power supply of the controlled receiver for a specified period of time after decay of the control voltage, e.g. in bathroom ventilation systems in which the upkeep of the fan operation (activated along with the lighting) is required for a specified period of time after turning off the accompanying lighting.