PT3

Earth fault definite time residual current relay with 1 operation threshold and for coupling with a separate toroidal transformer; its employement is peculiar for motor feeders. The device is made with a high immunity level against electrical disturbances so that it is particularly suitable, along with small size and mounting system for assembly into modular elements of MCC and PMCC.

PT4

Earth fault definite time residual current relay with 1 alarm threshold and 1 operation threshold with toroidal transformer mounted in the same case of the relay; its employement is peculiar for motor feeders.
The unit is made with a high immunity level against electrical disturbances so that it is particularly suitable, along with small size and mounting system, for assembly into modular elements of MCC and PMCC.
Options:

• Repeating signal device RPT