Thermal Circuit Breaker Schematic Symbol. The diagram symbols in table 1 are used by square d and where applicable conform to nema national electrical manufacturers a ssociation standards. Circuit breakers symbols for use in electrical pneumatic and hydraulic schematic diagrams.
It operates on the temperature rather than the current unless the current is sufficient to increase the temperature above the threshold point. Comparison of nema and iec schematic diagrams keywords. Disconnect circuit interrupter circuit breakers w thermal ol circuit breakers w magnetic ol limit switches foot switches pressure vacuum switches liquid level switches temperature actuated.
It operates on the temperature rather than the current unless the current is sufficient to increase the temperature above the threshold point.
Disconnect circuit interrupter circuit breakers w thermal ol circuit breakers w magnetic ol limit switches foot switches pressure vacuum switches liquid level switches temperature actuated. Circuit breaker thermal magnetic 3p single line symbols. 41 field circuit breaker 42 running circuit breaker 43 manual transfer or selector device 46 reverse phase or phase balance relay 47 phase sequence voltage relay 48 incomplete sequence relay 49 machine or transformer thermal relay 50 instantaneous overcurrent 51 ac time overcurrent relay 52 ac circuit breaker. The purpose of this document is to provide a simple cross reference of common schematic wiring diagram symbols used throughout various parts of the world.
