Square D PowerPacT P, M and R-frame circuit breakers are designed to protect electrical systems from damage caused by overloads and short circuits Molded case circuit breakers are available with either basic electronic trip system or Micrologic electronic trip units. Spring-charging motors for electrically-operated P-frame circuit breakers automatically charge the spring mechanism for closing the circuit breaker and recharges the spring mechanism when the circuit breaker is in the ON position. This motor spring-charging is rated for 100 to 130VAC and could be field installed.