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Motor-protective circuit-breaker
PKZ2 – overview
 
Special motor-protective trip block ZMR-...-PKZ2
 
This trip block features an overload relay function which allows the following interesting application:

In the event of an overload, the circuit-breaker does not trip. Instead, a normally closed contact (95-96) is actuated which switches off the contactor in the control circuit (contactors up to 18.5 kW, AC-3). At the same time, a normally open contact (97-98) is actuated, which ensures remote indication. The normally closed contact and normally open contact are suitable for carrying two different potentials.

The trip block has a manual and an automatic position:
  • Automatic position: The normally closed contact and normally open contact automatically return to the original position after the bimetallic strips have cooled down. The contact can be actuated again by actuation, for example, of a pushbutton.
  • Manual position: An acknowledgement locally, at the unit, moves the contacts back to the original position after tripping.
 
 

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