Supplied with either a MAG-GARD® motor circuit protector or a thermal magnetic circuit breaker, these combination starters are available in NEMA sizes 0-7.
For applications requiring a breaker-type combination starter, Square D provides both a thermal magnetic circuit breaker and a motor circuit protector for flexibility. The most widely used overcurrent protection devices are thermal-magnetic circuit breakers, which use bi-metals and electromagnets to provide both thermal and magnetic over-current protection. MAG-GARD motor circuit protectors are similar in construction but provide only short circuit protection. When MAG-GARD devices are used with motor starters, the adjustable instantaneous trip provides maximum motor protection based on specific amperage and application.
