Miniature breaker with safety device

Abstract

The invention provides a miniature breaker with a safety device. The miniature breaker comprises a closed shell which is composed of an upper shell and a lower shell. The closed shell is provided with an arc extinguish chamber, a first buffer area, a second buffer area, and a handle electromagnetic zone inside. The handle electromagnetic zone is provided with an electromagnetic system, a handle, a driving shaft, and an execution mechanism. The execution mechanism is provided with a lever and a contact support which is fixedly connected with a moving contact. Both the moving contact and a fixed contact of the electromagnetic system are provided in the arc extinguish chamber. The handle electromagnetic zone is closed space which is separated from the first buffer area, the second buffer area and the arc extinguish chamber. Air gap is provided between the first buffer area and the arc extinguish chamber. Air gap is provided between the second buffer area and the arc extinguish chamber. An outboard of the arc extinguish chamber is opened with a gas outlet. According to the miniature breaker with the safety device, impact of a handle spraying arc to a human body is effectively stooped, refitting is convenient, and cost is low.

Description

technical field

[0001] The invention relates to a small circuit breaker with a safety protection device. technical background

[0002] The existing small circuit breaker (hereinafter referred to as the circuit breaker), because the handle is connected with the internal mechanism of the circuit breaker, and limited by the space to ensure normal operation, there is inevitably an installation gap between the handle and the closed case, so when the circuit breaker In the event of a short circuit in the circuit and protection is then achieved, part of the arc will fly out from the gap between the handle and the enclosure. With the improvement of the quality of life of users, the power consumption has also increased, and the peak value of short-circuit fault current on the line has also gradually increased. Therefore, the arc safety protection requirements of circuit breakers have gradually become mandatory type test requirements in relevant standards.

[0003] In the prior art ...

Examples

Embodiment Construction

[0027] Refer to attached Figure 1-3 , a small circuit breaker with a safety protection device, including a closed case composed of an upper case 11B and a lower case 11A, the closed case is provided with an arc extinguishing chamber 12, a first buffer zone 15, a second buffer zone Area 17, handle electromagnetic area 16, electromagnetic system 1, handle 3, drive shaft 5, actuator 6 are installed in the handle electromagnetic area 16, lever 8 is installed on the actuator 6 and fixedly connected with movable contact 10 The contact support 4, the moving contact 10 and the static contact of the electromagnetic system 1 are installed in the arc extinguishing chamber 12;

[0028] The lower housing 11A is provided with a first baffle 2 and a second baffle 7A, the upper housing 11B is provided with a third baffle 7B at a position corresponding to the second baffle 7A, and the handle electromagnetic area 16 A closed space surrounded by the first baffle 2, the second baffle 7A, the t...

technical field

[0001] The invention relates to a small circuit breaker with a safety protection device. technical background

[0002] The existing small circuit breaker (hereinafter referred to as the circuit breaker), because the handle is connected with the internal mechanism of the circuit breaker, and limited by the space to ensure normal operation, there is inevitably an installation gap between the handle and the closed case, so when the circuit breaker In the event of a short circuit in the circuit and protection is then achieved, part of the arc will fly out from the gap between the handle and the enclosure. With the improvement of the quality of life of users, the power consumption has also increased, and the peak value of short-circuit fault current on the line has also gradually increased. Therefore, the arc safety protection requirements of circuit breakers have gradually become mandatory type test requirements in relevant standards.

[0003] In the prior art ...

Examples

Embodiment Construction

[0027] Refer to attached Figure 1-3 , a small circuit breaker with a safety protection device, including a closed case composed of an upper case 11B and a lower case 11A, the closed case is provided with an arc extinguishing chamber 12, a first buffer zone 15, a second buffer zone Area 17, handle electromagnetic area 16, electromagnetic system 1, handle 3, drive shaft 5, actuator 6 are installed in the handle electromagnetic area 16, lever 8 is installed on the actuator 6 and fixedly connected with movable contact 10 The contact support 4, the moving contact 10 and the static contact of the electromagnetic system 1 are installed in the arc extinguishing chamber 12;

[0028] The lower housing 11A is provided with a first baffle 2 and a second baffle 7A, the upper housing 11B is provided with a third baffle 7B at a position corresponding to the second baffle 7A, and the handle electromagnetic area 16 A closed space surrounded by the first baffle 2, the second baffle 7A, the t...

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