Regarding of the molded case circuit breaker mold the most popular products, which is the automatic Tripping Devices possessed 3 types of thermal –magnetic type of the molded case circuit breaker mold, hydraulic-magnetic type and electronic type. The first one is trip with the power of bimetal and electromagnet of the molded case circuit breaker mold, which has an overcurrent heats and warps the bimetal to trip by rotate the trip bar. 2 If the overcurrent is excessive, movable core rotates clockwise and the armature is attracted and to trip by rotate the trip bar of the molded case circuit breaker mold. The second is the trip with the power of electromagnet.

1. At an overcurrent flow, the magnetic force of the coil overcomes the spring; the core closes to the pole piece, attracts the armature, and actuates the trip bar of the molded case circuit breaker mold. The delay is obtained by the viscosity of silicon oil of the molded case circuit breaker mold. For another case, if the overcurrent is excessive, the armature is instantly attracted, without the influence if the moving core.

Standard of molded case circuit breaker mold

UL Standards (Underwriter's Laboratories) Safety Standards of US (UL 489 UL 1077)

UL is an organization in the US which established safety standards,i.e. UL Standards, conducts safety verification test based on the UL Standards, issues the certificates to approved the molded case circuit breaker mold and allows the manufacturers to attach the certification mark to the molded case circuit breaker mold. The UL certification mark has been spread widely in the US. Some states and cities oblige manufacturers to receive the UL certification. When devices, control panels of the molded case circuit breaker mold and machine are exported to the US these molded case circuit breaker mold must be UL certified, UL certified molded case circuit breaker mold have received UL recognition or UL listing in conformity to UL standards and allowed to be used in control panels of molded case circuit breaker mold and machines to be exported to the US.

The second one is CSA standards (Canadian Standard Association) STANDARDS OF CANADA, the CSA Standards are product safety standards established by CSA.UL certified products have received CSA certification from the testing body UL and allowed to be used in control panels and machines to be export to Canada UL has been authorized as a testing,cetification and the quality certification body by SCC, and CSA certified products tested by UL have been approved by the safety regulations in all states of Canada. Of course, it is allowed to attach any of the marks of the molded case circuit breaker mold for the US and Canada as before.

Technial Parameter

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