Molded case circuit breaker

A molded case circuit breaker comprising:

• an electronic trip unit configured to determine that a fault current has occurred and provide an indication of the determined fault current;
• and
• a relay assembly configured as a single module detachably attached to an interior of the molded case circuit breaker, the relay assembly comprising:
• a plurality of fault indicating relays configured to generate a fault current indication signal by opening or closing a contact when the indication of the determined fault current is received;
• a printed circuit board (PCB) which the plurality of fault indicating relays mounted thereon, the PCB electrically connected to the plurality of fault indicating relays and the electronic trip unit;
• a signal output terminal electrically connected to the PCB and configured to externally transmit the generated fault current indication signal;
• a case comprising an open upper portion that encloses the plurality of fault indicating relays, the PCB and the signal output terminal;
• and
• a cover that covers the case and comprises a signal line connection hole configured to externally expose the signal output terminal connection to an external signal line.