COMPACT CIRCUIT INTERRUPTER HAVING MULTIPLE AMPERE RATINGS

摘要

A compact circuit breaker containing an electronic trip unit for interrupting overcurrent conditions within a protected cir- cuit is made operable over a wide operating current range by means of current transformers having multiple turn primary wind- ings. The primary windings are selected to provide a constant ampere-turns ratio to the current transformers without changing the size of the secondary winding or the volume of the trans- former core.