초록 ▼

A compact current transformer is formed by arranging a pair of secondary windings on opposite sides of a single turn primary winding. A core is then wound about the primary winding and part of the secondary winding coils from a continuous roll of metal strap. The secondary windings are arranged on a

A compact current transformer is formed by arranging a pair of secondary windings on opposite sides of a single turn primary winding. A core is then wound about the primary winding and part of the secondary winding coils from a continuous roll of metal strap. The secondary windings are arranged on a pair of bobbins on opposite sides of the transformer core. A modular twin bobbin arrangement allows the secondary windings to be wound from a continuous source of transformer wire. The continuous wound core eliminates air gaps and improves magnetic transfer between the primary winding and the secondary winding. The continuous transformer wire eliminates the need for soldering or welding to connect between the two secondary windings.

대표청구항 ▼

[ We claim:] [1.] A compact circuit breaker having variable ampere ratings for providing circuit current to a protected circuit comprising:a molded plastic circuit breaker cover and a molded plastic circuit breaker case;a pair of separable contacts within said case and arranged for interrupting the

[ We claim:] [1.] A compact circuit breaker having variable ampere ratings for providing circuit current to a protected circuit comprising:a molded plastic circuit breaker cover and a molded plastic circuit breaker case;a pair of separable contacts within said case and arranged for interrupting the circuit current upon an occurrence of an overcurrent condition through said contacts;an electronic trip unit arranged within said circuit breaker cover for controlling operation of said contacts; anda current transformer within said case connected with said trip unit for providing operating power to said trip unit and providing a current signal to said trip unit representative of the circuit current, said current transformer comprising:a primary winding;a metal core arranged about said primary winding;first and secondary windings arranged on opposite sides of said primary winding, said first secondary winding comprising first wire turns arranged on a first bobbin having first and second first bobbin ends, said second secondary winding comprising second wire turns arranged on a second bobbin having first and second bobbin ends, said first end of said first bobbin being joined to said first end of said second bobbin, said first wire turns being arranged on said first bobbin in a first direction and said second wire turns being arranged on said second bobbin in a second direction opposite said first direction, said first and second wire turns being formed from a continuous wire.