Undervoltage release for circuit breaker

Claim 1

AN AUTOMATIC TRIPPING DEVICE FOR CIRCUIT BREAKERS COMPRISING: (A) A SUPPORT FOR MOUNTING ON AN ASSOCIATED CIRCUIT BREAKER; (B) A SOLENOID MOUNTED ON SAID SUPPORT; (C) AN ACTUATING ARMATURE RECIPROCALLY ENGAGED BY SAID SOLENOID; (D) A TRIPPING PLUNGER SLIDABLY MOUNTED ON SAID SUPPORT, SAID TRIPPING PLUNGER BEING ADJUSTABLE IN LENGTH FOR ENGAGEMENT WITH AND TO OPERATE A TRIP MEMBER OF THE ASSOCIATED CIRCUIT BREAKER; (E) A COMPRESSION SPRING MEANS MOUNTED ON SAID SUPPORT AND ENGAGING SAID TRIPPING PLUNGER FOR BIASING SAID TRIPPING PLUNGER FROM A LATCHED POSITION TO A TRIPPED POSITION TO ENGAGE AND OPERATE A CIRCUIT BREAKER TRIP MEMBER OF THE ASSOCIATED CIRCUIT BREAKER; (F) A LATCH MEMBER PIVOTALLY MOUNTED ON SAID SUPPORT AND ENGAGED WITH SAID ACTUATING ARMATURE, SAID LATCH MEMBER INCLUDING A LEG PORTION RELEASABLY ENGAGEABLE WITH SAID TRIPPING PLUNGER IN THE LATCHED POSITION THEREOF; (G) ADJUSTABLE TENSION SPRING MEANS MOUNTED BETWEEN SAID SUPPORT AND SAID LATCH MEMBER FOR BIASING SAID LATCH; AND (H) A RESETTING LEVER PIVOTALLY MOUNTED ON SAID SUPPORT AND HAVING A PORTION ENGAGED WITH SAID TRIPPING PLUNGER TO EFFECT SLIDING MOVEMENT THEREOF TO THE LATCHED POSITION.