Trip assembly for a circuit breaker

In a fluid immersible primary circuit breaker which is responsive to fault and overload conditions in a fluid filled electrical apparatus, said breaker including

• a frame adapted to be mounted in the fluid in the apparatus,
• a first contact mounted on said frame,
• a second contact mounted for movement into and out of engagement with said first contact,
• a first spring assembly connected to bias said second contact away from said first contact, a second spring assembly movable between a first position biasing said second contact into engagement with said first contact and a second position biasing said second contact away from said first contact,
• a latch operably connecting said second spring assembly to said first spring assembly whereby said second contact responds to the position of said second spring assembly,
• the improvement comprising a temperature responsive trip assembly for releasing said latch from said first spring assembly, said trip assembly includes a magnet member and a nickel-iron alloy element having a predetermined Curie temperature whereby said first spring assembly will move said second contact away from said first contact in response to a fault or overload condition.