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ANSI (American National Standards Institute) established some numeral notations for protective devices. 52 means AC breaker.

52. A-C Circuit Breaker. is a device that is used to close and interrupt an a-c power circuit under normal conditions or to interrupt this circuit under fault of emergency conditions.

20.2) defines the meaning of 52a and 52b switches, which (paraphrased) are: 52a - a circuit breaker operating mechanism actuated switch that is closed when the main contacts are closed. 52b - a circuit breaker operating mechanism actuated switch that is closed when the main contacts are open.

ANSI/IEEE Device Numbers ANSI/IEEE codeDevice41Field circuit breaker52AC power circuit breaker57Shorting/grounding switch63Pressure switch8 more rows

79 AC reclosing relay A relay that controls the automatic reclosing and locking out of an AC circuit interrupter.

Protects rotating equipment from the damaging effects of excessive negative-sequence voltage resulting from phase failure, phase unbalance, and reversed-phase sequence.

94. Tripping or Trip-Free Relay. is a relay that function to trip a circuit breaker, contactor or equipment, or to permit immediate tripping by other devices; or to prevent immediate re -closure of a circuit interrupter if it should open automatically even though its closing circuit is maintained closed.

ANSI (American National Standards Institute) established some numeral notations for protective devices. 52 means AC breaker. When you look at drawings or schematics and see the number 52, there is an AC breaker somewhere.