No neutral wire in three-phase circuits
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I would like to ask: if the neutral wire is not connected in a three-phase system, will the circuit breaker trip in case of a short circuit? And why? Please ask an expert to explain
The operation of a three-pole air switch is independent of the neutral wire. First, understand the working principle of the air switch: it simply turns the circuit to be controlled into an electromagnetic coil with fewer turns. A core is placed inside the coil, and on top of this core there is a ferromagnetic plate that can be attracted by the tripping mechanism; as a result, such coils require a strong current in order to function. When a short circuit occurs in the circuit, a short-circuit current that is 80 to 200 times greater than the circuit’s rated current is generated, causing the coil to activate and the switch to trip. This is the short-circuit protection of the air switch.
The circuit breaker will operate in the case of a load short circuit, regardless of whether a neutral wire is present or not. Because circuit breakers all come equipped with short-circuit protection.
The circuit breaker itself has short-circuit protection, which is independent of the neutral wire.