Abstract: Some embodiments of the inventive subject matter provide an apparatus for driving a shunt trip actuator for a circuit breaker or other switch. The apparatus includes an energy storage device and an accumulator circuit configured to store energy in the energy storage device responsive to a shunt trip control signal. The apparatus further includes a detector circuit configured to generate a detection signal responsive to a state of the energy storage device meeting a predetermined criterion and a driver circuit configured to drive the shunt trip actuator using the energy stored in the energy storage device responsive to the detection signal.

Abstract: An electronic trip unit having a number of trip unit settings includes: a first input member; a second input member; a multi-position selector configured to select one of plurality of positions corresponding to values of the trip unit settings; a plurality of indicators each corresponding to one of the plurality of trip unit settings; and a processor having a routine, wherein the routine of the processor is structured to, in response to actuation of the first input member, increment a ring counter value and selectively activate one of the indicators corresponding to the ring counter value; and wherein the routine of the processor is further structured to, in response to actuation of the second input member, set a value of the trip unit setting corresponding to the activated indicator based on the selected position of the multi-position selector.

Abstract: Some embodiments of the inventive subject matter provide an apparatus for driving a shunt trip actuator for a circuit breaker or other switch. The apparatus includes an energy storage device and an accumulator circuit configured to store energy in the energy storage device responsive to a shunt trip control signal. The apparatus further includes a detector circuit configured to generate a detection signal responsive to a state of the energy storage device meeting a predetermined criterion and a driver circuit configured to drive the shunt trip actuator using the energy stored in the energy storage device responsive to the detection signal.

Abstract: An electronic trip unit having a number of trip unit settings includes: a first input member; a second input member; a multi-position selector configured to select one of plurality of positions corresponding to values of the trip unit settings; a plurality of indicators each corresponding to one of the plurality of trip unit settings; and a processor having a routine, wherein the routine of the processor is structured to, in response to actuation of the first input member, increment a ring counter value and selectively activate one of the indicators corresponding to the ring counter value; and wherein the routine of the processor is further structured to, in response to actuation of the second input member, set a value of the trip unit setting corresponding to the activated indicator based on the selected position of the multi-position selector.