Double Pole Circuit Breaker Symbol

A circuit breaker that is connected to a 110 volt circuit is called a single pole breaker.

Double pole circuit breaker symbol. A 2 way changeover switch directs the flow of current to one of two routes according to its position. Circuit breakers symbols for use in electrical pneumatic and hydraulic schematic diagrams. Provide 240 volts 20 60 amps and have two hot wires that share one neutral wire. Dual on off switch dpst dpst double pole single throw.

A different type of doubled up breaker is a quad breaker which serves two 240 volt circuits but is the same width as a standard double pole breaker. We ll take a closer look at the differences between each of these breakers and discuss when you should use one over the other. Horizontal symbol vertical symbol description hcb2 vcb2 circuit breaker 2nd pole hcb21th vcb21th thermal 2nd pole hcb21thi vcb21thi current limit thermal 2nd pole hds21 vds21 disconnect 2nd pole hds21aux vds21aux disconnect normally open auxiliary contact hds22aux vds22aux disconnect normally closed auxiliary contact hcb2120f vcb2120f auto return hcb2121f vcb2121f with mechanical block and. This symbol represents circuit breaker with three poles.

For all practical purposes conductors for circuit breakers are sized based on the 75 c column of table. Unlike a fuse which operates once and then must be replaced a circuit breaker can be reset either manually or automatically to resume. A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit its basic function is to interrupt current flow after a fault is detected. Circuit breakers come in several styles including the standard single pole breakers that serve 120 volt household circuits and double pole breakers that take up two slots in a breaker box and serve 240 volt appliances a special kind of circuit breaker is the tandem breaker which is designed to allow two 120 volt circuits to be fit into a single slot in the circuit breaker box.

It connects three phases whenever there is an overload or short circuit in any phase the circuit breaker trips all three phases simultaneously. Some spdt switches have a central off position and are described as on off on. Single pole breakers are the narrow switches located on your home s electrical panel. Spdt single pole double throw.

Unlike a double pole breaker which serves a single 240 volt circuit a cheater serves two 120 volt circuits. Such kind of breakers is used in three phase systems in industries. Two pole breakers can be either slash or straight voltage rated whereas 3 pole breakers are all straight voltage rated.