NORMALLY CLOSED – NORMALLY OPEN
The TM1 series thermal motor protector is single pole and is normally not current sensitive when operating in its nominal current range. There are different versions for nominal current value: 2.5; 5 or 10 amps available.
The operating principle of TM1 is both simple and effective. When a fault condition occurs, the increased current and ambient temperature make the bimetal disk snap, which opens the protector contacts.
The contacts close again automatically as the device cools down to a safe operating temperature (automatic reset function).
Contact configuration has two modes: normally closed (NC) or normally open (NO).