| 摘要 |
Disclosed is a molded case circuit breaker having an instantaneous trip mechanism capable of instantaneously breaking a circuit upon occurrence of a fault current, the circuit breaker comprising: a main circuit unit (21, 22, 23) present in a lower compartment (20) of the molded case circuit breaker, and configured to open or close a circuit by having a stationary contactor (21) and a movable contactor (22) rotatable to contact with or separated from the stationary contactor; a switching mechanism (50) present in an upper compartment (10) of the molded case circuit breaker, and having an open position where the switching mechanism is connected to the main circuit unit to drive the main circuit unit to open a circuit, and a closing position where the switching mechanism drives the main circuit unit to close a circuit; an instantaneous trip mechanism (1, 2, 3) present in the upper compartment, and operating by an electromagnetic attraction in response to generation of a fault current on a circuit so as to trigger the switching mechanism to the open position; and an intermediate insulation barrier (60) installed between the upper compartment and the lower compartment for electrical insulation by partitioning the lower compartment having the main circuit unit and the upper compartment having the instantaneous trip mechanism and the switching mechanism. |
