High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Multiple break
Patent
1997-12-12
1998-12-01
Donovan, Lincoln
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Multiple break
218 1, 218148, 335201, H01H 3314, H01H 940
Patent
active
058441875
ABSTRACT:
A circuit breaker having a movable load contact arm (14'), which pivots between an open position and a closed position, and a stationary line contact arm (16'). The circuit breaker includes an arcing contact structure (210) which is pivotally mounted on the stationary line contact arm. The arcing contact structure is generally "J" shaped, having a straight portion and a curved portion. The straight portion includes a bearing surface (211) which engages a bearing surface (221) on the bottom side of the line contact arm. The curved portion of the arcing contact extends beyond the end of the line contact arm and includes an electrical contact (212) which extends above the line contact arm when the load contact arm is in the open position. The arcing contact structure includes a biasing spring (214) which biases the arcing contact toward the load contact arm when the load contact arm is in the open position but allows the load contact arm to engage both the arcing contact structure and the electrical contact on the load contact arm when the load contact arm is in the closed position. As the load contact arm moves from the closed position to the open position, the spring urges the arcing contact structure to maintain an electrical connection with the electrical contact on the load contact arm as the load contact arm breaks electrical connection with the line contact arm. By breaking electrical contact with the load contact arm after the line contact arm has broken electrical contact with the load contact arm, electrical arcing between the electrical contacts on the load contact arm and line contact arm are significantly reduced.
REFERENCES:
patent: 4019097 (1977-04-01), Miller et al.
patent: 4484045 (1984-11-01), Seymour et al.
patent: 4595896 (1986-06-01), DiMarco et al.
patent: 4882556 (1989-11-01), Fujii et al.
patent: 4970481 (1990-11-01), Arnold et al.
patent: 4973805 (1990-11-01), Paton et al.
Donovan Lincoln
Siemens Energy & Automation Inc.
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