Combined accessory and trip actuator unit for electronic circuit breakers

A combined trip actuator and undervoltage release for electronic circuit breakers comprising:

• magnetic support means;
• a trip coil mounted within said support means having a movable armature extending partially within said trip coil and biased into a tripping position by a compression spring:
• an undervoltage release coil within said support means providing a predetermined magnetic holding flux to retain said armature in a non-trip position against said compression spring when said undervoltage release coil is energized by a first predetermined voltage;
• and
• a magnetic flux diverter intermediate said undervoltage release coil and said trip coil for diverting said magnetic holding flux away from said armature when said trip coil is energized to allow said armature to extend to said tripping position under the urgence of said compression spring, said flux diverter comprising a dual-diameter magnetic cylinder the smaller diameter being arranged partially within said trip coil, the larger diameter being arranged in abutment with said undervoltage release coil, said undervoltage release coil providing less than said predetermined holding flux to said armature when said undervoltage release coil is energized by a voltage less than said predetermined voltage whereby said armature becomes extended to said tripping position under the urgence of said compression spring.