| 摘要 |
<p>A molded plastic current limiting circuit breaker having for each pole, a stationary contact (28) and movable contact (26) separable upon occurrence of a current higher than a predetermined level. The stationary and movable contacts are positioned inside an over-molded magnet opening to greatly increase the magnetic repulsion force between them and rapidly accelerate their separation by concentrating the magnetic fields generated upon an occurrence of a high level short circuit. The over-molded magnet (34) is composed of a plurality of steel plates grouped together and being over-molded with a thermoplastic material. The thermoplastic material has grooves integrally formed therein for retaining insulator inserts (37, 39) that protect the thermoplastic material during separation of the stationary and movable contacts.</p> |
