초록 ▼

A low voltage switchgear with a single or multipole contact arrangement (1) with a corresponding number of fixed contacts (2) and movable contacts (3), a magnet armature (4) that moves the movable contacts (3), at least one magnet coil (5) that is energized by direct current and a setpoint switch re

A low voltage switchgear with a single or multipole contact arrangement (1) with a corresponding number of fixed contacts (2) and movable contacts (3), a magnet armature (4) that moves the movable contacts (3), at least one magnet coil (5) that is energized by direct current and a setpoint switch release (9). The magnet armature (4) operates in a bistable way and is kept in the respectively reached switching position The switchgear is universally usable and becomes reliable by providing an overcurrent protective circuit (13) that energizes the magnet coil (5) after a predetermined time delay by direct current in the conduction direction necessary to reach the switching-off position of magnet armature (4) when an overcurrent that lies below a threshold overcurrent appears at least at one connected pole (12), and when a current that reaches or exceeds a threshold overcurrent appears at least at one connected pole (12), the magnet coil (5) is energized with direct current in the conduction direction necessary to reach the switching-off position of magnet armature (4) as rapidly as possible.

대표청구항 ▼

Low voltage switchgear for use in alternating voltage systems, comprising at least one pole contact element with a corresponding number of fixed contacts and movable contacts, a magnet armature coupled to the movable contacts for moving them, at least one magnet coil which is energized by direct cur

Low voltage switchgear for use in alternating voltage systems, comprising at least one pole contact element with a corresponding number of fixed contacts and movable contacts, a magnet armature coupled to the movable contacts for moving them, at least one magnet coil which is energized by direct current and a setpoint switch release for operating the magnet armature in a bistable way so that a brief direct current energizing of the magnet coil in one of two possible conduction directions that is released by the setpoint switch release brings the magnet armature into a respective one of a switching-on and a switching-off position where it remains until a subsequent energization; wherein an overcurrent protective circuit is provided, said overcurrent protective circuit being operative for energizing the magnet coil with direct current in the conduction direction necessary to reach the switching-off position of magnet armature with a predetermined time delay after an overcurrent that lies below a threshold overcurrent appears at least at one connected pole, and for energizing the magnet coil with direct current in the conduction direction necessary to reach the switching-off position of the magnet armature as soon as possible after a current that at least reaches the threshold overcurrent appears at least at one connected pole.