... formotor operating; 5, According to overload release type: Magnetic release (only instantaneous) the modynamicmagnetic type (dual), electronical release; 6, According to number of poles ... the other three poles. 9, Type B: No overload release on N pole, which closing and opening with the other ... three poles. 10, Type C: With overload release on N pole, which closing and opening with the other ...