The difference between leakage circuit breaker and air switch

The difference between leakage circuit breaker and air switch

The air switch can also be called an air circuit breaker, and due to its appearance, structure, size and material, it is also divided into plastic case and small (micro).

Leakage circuit breakers are also called leakage protection circuit breakers, leakage protectors, residual current action protectors, etc. Of course, in daily life, most people still habitually call it leakage switches and leakage protection switches, which is better understood. In fact, this equipment is a protection device that combines air switch and leakage protection accessories to improve safety. The installation methods are divided into assembled and integrated types. Usually, leakage circuit breakers and air switches are applied to Used in low-voltage power circuits.

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The air switch in the circuit generally plays a role in protecting the circuit when there is an overload, short circuit and other faults. The main switch in the circuit can be a molded case circuit breaker, and a small (miniature) circuit breaker can be used in the end circuit.

The leakage circuit breaker is designed to prevent personal electric shock. When the leakage current in the circuit exceeds a predetermined value, it can automatically provide a protective action. It can be selected according to the requirements of direct or indirect contact with electric shock protection.

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The schematic diagram of electrical symbols is shown below, where the left is an air switch, the middle is an isolating switch, and the right is a leakage circuit breaker. Regardless of the type of switch, these parameters will be printed on the shell, and the leakage switch will also be marked with the leakage action current such as 30mA, 100mA, etc., which is also one of the technical parameters worth considering when selecting.

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The difference between a leakage circuit breaker and an air switch is a bit more layman, it is a kind of ordinary air switch that will not act when leakage occurs, and the other is that the leakage air switch has leakage protection. When a switch with leakage protection is used in a circuit operated by personnel (such as a socket circuit in a household), it can effectively ensure personal safety.

In addition, the two also have a certain difference in appearance. The shell appearance of the leakage circuit breaker has a test (test) button with a raised "T" on it, which is next to the words "Press once a month" That one. There is also the reset button, which is the one next to the words "press before closing". It is possible that some leakage circuit breakers are not marked with words, but in general, these two buttons exist.

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The difference between 1P+N and 2P in leakage circuit breaker

1. The air switch is different: the 1P+N pole leakage circuit breaker uses a 1P air switch, while the 2P pole leakage circuit breaker uses a two-pole two-wire leakage protector, a 2P air switch plus a leakage current Module.

2. The disconnection circuit is different: when the 1P+N leakage occurs, the leakage module will drive the air switch to trip. At the same time, the live wire is disconnected but the neutral wire is not disconnected. The main reason is that the live wire has a thermal magnetic trip function, which only The role of protection and control of the line of fire. When the 2P leakage occurs, the circuit breaker leakage module drives the air switch to trip and disconnect the live wire and the neutral wire, both of which have a thermal magnetic trip function.

3.There are also differences in technical parameters such as rated voltage, current, and size.

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