Importance

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Abstract

A circuit-breaker including a moving assembly having a moving main contact (14) electrically connected to a first terminal (2A), a fixed assembly having a fixed arcing contact electrically connected to a resistance (5) which is connected to a second terminal (3A), and a temporary insertion assembly for temporarily inserting the resistance when closing the circuit-breaker. The fixed arcing contact is an elongated metal rod (11) having a first end (11A). The temporary insertion assembly includes a ring (22) that slides along and electrically contacts the metal rod. The ring has first contacts (25) that cooperate with the moving main contact (14), and second contacts (31) that cooperate with third contacts (32) connected electrically to the second terminal (3A). A first biasing member (29) biases a cylindrical insulating pusher (28) toward the moving assembly, and a second biasing member (40) biases the insertion assembly in the same direction. The moving main contact (14), first contacts (25), second contacts (31), and third contacts (32) are arranged so that, when the circuit-breaker is in the disengaged position, a first distance (d1) between the first contacts (25) and the moving main contact (14), and a second distance (d2) between the second contacts (31) and the third contacts (32) are both equal to or greater than a corresponding isolation distance for preventing re-striking of an arc between the contacts.

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First Claim