Back-up protection tripping device of electronic type molded case circuit breaker

Abstract

The invention discloses a back-up protection tripping device of electronic type molded case circuit breaker, which is mainly applied to B phase super current short circuit protection for electronic type molded case circuit breaker. The back-up protection tripping device comprises a breaker manipulator, a connecting rod and a back-up protection tripper; the breaker manipulator is provided with a drag bar; the connecting rod is arranged between the drag bar and an armature to be hinged on the breaker manipulator, two ends of the connecting rod are respectively buckled with the armature and the drag bar, thus avoiding the back-up protection tripper applied on B phase in the invention to be in the same line with the existing back-up protection trippers on A phase and C phase, namely, the back-up protection tripper on B phase is arranged in stagger way with the back-up protection trippers on A phase and C phase, thus avoiding interference of the breaker manipulator and leaving space for installation of the back-up protection tripper on B phase; therefore, while A phase and C phase are provided with back-up short circuit protection, back-up short circuit protection of B phase can be realized.

Description

technical field [0001] The invention relates to a backup protection tripping device of an electronic molded case circuit breaker, which is mainly used in the protection of the super large short-circuit current of the B phase of the electronic molded case circuit breaker in the prior art. Background technique [0002] The electronic molded case circuit breaker uses the control signal generated by the intelligent controller to control the trip unit to break the circuit breaker, so that the circuit breaker can protect the circuit. However, when there is a large short-circuit current passing through the circuit, the electronic molded case circuit breaker Circuit breakers cannot break faults very quickly and effectively protect lines. [0003] Therefore, in the prior art, an electromagnetic backup protection release is generally installed in the electronic molded case circuit breaker to realize rapid breaking of the extremely large short-circuit current. The electromagnetic backu...

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Problems solved by technology

[0003] Therefore, in the prior art, an electromagnetic backup protection release is generally installed in the electronic molded case circuit breaker to realize rapid breaking of the extremely large short-circuit current. The electromagnetic backup protection release generally includes an armature, a bracket, and The base of the circuit breaker is fixedly connected to the yoke, the pin shaft and the reaction force spring. The armature is hinged to the upper end of the bracket through the pin shaft, while the yoke is fixedly connected to the lower end of the bracket. The reaction force spring is sleeved on the pin shaft, and the The two ends of the reaction force spring are respectively connected with the armature and the bracket, and the backup protection releases on the two phases of the circuit breaker A and C are installed in the following way: that is, two connecting parts are respectively arranged on the armature and the drawbar respectively, In order to realize the interlocking between the armature and the drawbar, when there is an abnormally large short-circuit current, the rotation of the armature will affect the rotation of the drawbar due to the attraction between the armature and the yoke, so that the operating mechanism of the circuit breaker will be released, and the circuit breaker will be quickly operated. Breaking, it can be seen that two connecting parts for the armature of the electromagnetic backup protection release on the two phases of A and C have been set at intervals on the drawbar. For small-capacity electronic molded case circuit breakers , due to the limitation of the installation space, it is no longer possible to install the B-phase backup protection release according to the installation method of the A and C two-phase electromagnetic backup protection releases. Therefore, in the prior art, the B-phase of the circuit breaker is not With extra large short-circuit current protection

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