1. Apply to 50Hz380V,13~125KW 3-Phase asynchro-nous motor's infrequently start and stop;2. Al-alloy diecasted or steelplate welded shell with plastic-sprayed surface;3. Inside mounted breaker, AC contactor, thermal-relay, time relay, changeover switch and indicator, etc;4. Delay automatic time-control relay can be set within0.4~60 seconds;5. Apply to 8 hours work system, continuity work system and continuous period work system the operation cyclic per hour. The interval time of twice continuously sarts is not less than 90 seconds;6. Possessing the guarding function against overload and phase failure, etc;7. Steelpipe and cable wiring.8. Can be customized according to user's requirements.9. Suitable for GB3836-2000IEC60079, GB12476.1-2000IEC61241 standard request.