DZ518(GV1,GV2,GV3) the series electric motor protection circuit breaker, uses the modular design, the contour is artistic, the volume is small, breaks protects, inside sets Hot Relay, the function is strong, the versatility is good. The DZ518 series conforms to IEC60947.2 and IEC60947-4.1 as well as the EN60947-1 standard. The switch and the contact device may compose the electric motor is direct starts. The DZ518 series outer covering protection rank may achieve IP65. This series pooled three types model products: DZ518 (GV2-M, ME) is the electric motor belt thermo magnetism protection circuit breaker which the button controls; DZ518 (GV2-RS) is the electric motor belt thermo magnetism protection circuit breaker which the change-over switch controls; DZ518 (GV2-LS, LE) is the electric motor belt magnetism protection circuit breaker which the change-over switch controls (does not bring hot protection).