Tele 2390103 G2TF01 Gamma Temperature Monitoring Relay, PTC Temperature monitoring with a PTC 2390103 Scheda Tecnica

Subject to alterations and errors

If the supply voltage U is applied (green LED illuminated) and the 
cumulative resistance of the PTC-circuit is less than 3.6k

Ω (standard 

temperature of the motor), the output relay switches into on-position.
Pressing the test/reset key under this conditions forces the output 
relay to switch into off-position. They remain in this state as long as 
the test/reset key is pressed and thus the switching function can be 
checked in case of fault. The test function is not effective using an 
external reset key.
When the cumulative resistance of the PTC-circuit exceeds 3.6k

Ω (at 

least one of the PTCs has reached the cut-off temperature), the out-
put relay switches into off-position (red LED illuminated). The output 
relay again switch into on-position (red LED not illuminated), if the 
cumulative resistance drops below 1.8k

Ω by cooling down of the PTC 

and either a reset key (internal or external) was pressed or the supply 
voltage was disconnected and re-applied.