The front-mounted TEF4 electronic time relays are used for time control tasks that are independent of the control system and are available with response and release delay., TEF4 electronic time relays are mounted and locked on the front of AF contactors or NF auxiliary contactors. A mechanical display shows the contactor status., TEF4 electronic time relays are powered via a direct connection connected in parallel to the coil terminals A1 - A2 of the contactor or auxiliary contactor. A varistor is integrated into the time relay to protect against surge voltages in the contactor coil., With TEF4-ON or TEF4-OFF, time-delayed functions of up to 100 s in three different time ranges are possible, regardless of the control system. The time delay ranges are selected using a switch, and the time delay is set using a rotary switch. The time control function is activated by closing or opening the device on which the time relay is mounted., The version with release delay works without additional control voltage.
| Property | Value |
| Number of contacts as normally closed: | 1 |
| Number of contacts as normally open: | 1 |
| Switching function: | delayed release |
| Setting time: | 0.1 to 100 s |
| Activity principle: | electronic |
