Shunt release capable of detecting working state of circuit breaker

Abstract

A shunt release able to check working status of a circuit breaker includes a shell (1), an electromagnet (2) composed of a coil (21) and an armature (22), a control circuit (3), a current mutual inductor (4), etc. Switch working status indication circuit includes a resistance R1 and an integrated circuit IC1. When the switch K is disconnected, the bridge rectifiers D1-D4 do not have voltage output. The integrated IC1's pins (1) and (2) do not have current, and pins (3) and (4) are disconnected. The switch control circuit of the control circuit (3) includes an integrated circuit IC2, a resistance R2, a controllable silicon Q1, the bridge rectifiers D1-D4, and the electromagnet. When the pins (1) and (2) of the integrated circuit IC2 receive external signals, the pins (3) and (4) of the integrated circuit IC2 are connected so as to further connect the controllable silicon Q1, thus making the electromagnet TQ drive the link gear to disconnect switch K; the invention has the function of checking the working status of breaker, and the trip coil will not be burned because of frequent actions. Due to wide application, the invention can receive a or a plurality of external control signals to control the circuit breaker.

Description

[0001] Explanation: The switch in this article is equal to the circuit breaker, and the air switch is a kind of circuit breaker. technical field [0002] The invention relates to a low-voltage electrical product, in particular to a shunt tripper used in combination with a circuit breaker. Background technique [0003] Existing shunt trippers equipped with circuit breakers, such as shunt trippers matched with leakage protection switches, also known as air switches, generally include a casing, and a device composed of a coil and an armature is arranged in the casing. Tripping mechanism, mutual induction coil, control circuit and terminal, etc. The mutual induction coil is set on the phase line and the neutral line. When the current on the phase line and the neutral line changes, the mutual induction coil will generate a current, which is input into the control circuit, and the thyristor in the control circuit is turned on. A loop is formed between the neutral line and the pha...

AI Technical Summary

Problems solved by technology

However, when it is necessary to disconnect the air switch in time in other situations, it cannot be realized.

In the event of a fire, it is generally necessary to manually cut off the power supply after the firefighters arrive at the scene.

For another example, in the process of power management, if someone loosens the electronic seal of the meter box, it cannot disconnect the circuit in time; It only acts when it is active, and does not act in other cases. Therefore, the use of various circuit breakers with this kind of shunt release (air switch is only one of them) is greatly limited.

In addition, after the circuit breaker with this kind of shunt release works, people cannot know the working state of the circuit breaker, that is, it is not known whether the circuit breaking action is really completed.

Furthermore, the previous shunt release also has the defect that the coil is easily burned when the coil is frequently tripped.

After searching the Chinese patents, it was found that although the Chinese patent documents disclosed some patent documents related to shunt releases, most of the circuits of these releases had the defects of complex circuits and poor versatility, that is, they could only target one or a certain For some specific purposes, such as trip units used in IC card watt-hour meters, etc.

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