A single pole circuit breaker is only one point in the switch circuit, that is, the incoming line of the FireWire. The 2 pole circuit breaker simultaneously turns off the firing line and the zero line, so if the 2 pole circuit breaker controls the incoming and outgoing lines of the single-phase circuit, there will be no current in the circuit after shutting down.

1. Single pole circuit breaker
and 2 pole circuit breaker
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2. A single pole circuit breaker
is only one point in the
switch circuit, that is, the
incoming line of the FireWire
The 2 pole circuit breaker simultaneously
turns off the firing line and the zero line, so
if the 2 pole circuit breaker controls the
incoming and outgoing lines of the single-
phase circuit, there will be no current in the
circuit after shutting down.
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3. Some original parts of the some
device are very sensitive, and the zero
line may cause damage to the original
parts. so it is necessary to cut off the
fire line and zero line with 2 poles;
some circuits do not need to turn off
the fire line and zero line, but must be
opened and closed at the same time.
In this case, the 2 pole circuit breaker
is also used to ensure synchronization.
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4. 01
02
Circuit breaker with leakage protection
are generally more than 2 poles,
because leakage protection mus
t measure the currents of incoming
and outgoing poles.
If there is leakage protection in the circuit, but it need
to be controlled by a single pole switch the single
pole circuit breaker can be used.
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7. Thank You!
Editor: Action
action@xinlielectric.com
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