Selective tripping device for low voltage circuit breaker

Abstract

The invention discloses a selective tripping device for a low-voltage circuit breaker, which comprises three electrode conductors, an insulating case and an adjustment piece fixed on the insulating case. The adjustment rod is installed in parallel, the two ends of the adjustment rod are suspended on the adjustment piece, and there are three pendant rods and one adjustable rod on the adjustment rod; each position is opposite between the adjustment rod and the three conductors, and there is a gap between them. The armature and the moving armature, the fixed armature is fixedly installed on the conductor, the lower part of the moving armature can pivot; the upper end of the extension spring is hung on the pendant rod, the lower end is connected to the moving armature, and the upper end of the adjustable rod extends into the groove at the lower part of the knob. The invention forms an air gap between the fixed armature and the moving armature. When the current exceeds the corresponding threshold value, the moving armature moves from the rest position to the fixed armature to realize the tripping function. Different tension springs and adjustable rods can be obtained by adjusting the tension spring and the adjustable rod. Tripping current, reliable tripping action.

Description

technical field [0001] The invention relates to a low-voltage electrical equipment, in particular to a tripping device of a multi-pole low-voltage circuit breaker, especially a device with a magnetic tripping and a thermal tripping on each pole. Background technique [0002] When the low-voltage circuit breaker detects the passage of overcurrent in the main circuit system, its tripping unit generates a tripping action to protect the circuit system and various components in the main circuit from damage. The tripping unit includes a magnetic tripping unit And the thermal trip unit, the magnetic trip unit generally adopts the oil cup type or the magnetic yoke type structure, the oil cup type magnetic trip unit adopts the upper and lower armatures, and there is a spring between the armatures. When the short-circuit current passes, the upper armature is sucked, so that The trip lever moves and the mechanism trips. Since the magnetic trip unit sets a fixed threshold value, it cann...

AI Technical Summary

Problems solved by technology

Thermal trip unit Since the trip rod is not movable in the axial direction, resulting in a fixed distance between the trip rod and the bimetal, the thermal trip unit is also not selective

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