Snsx mccb is suitable for the circuit of ac 50/60 hz, rated isolation voltage 750v, rated working voltage up to 690v and rated current up to 630a. The installation height above sea level can not exceed 2000 meters.The breaker can be used at a temperature between -25 to +70 .When the temperature exceeds 40(or for the motor protection it exceeds 65), the capacity must be reduced for the equipment. It can withstand the impact from humid air, salt fog, oil mist and mildew fog. It should be installed in the medium without explosive hazard or non conductive dust, and the media is not strong enough to corrode the metal or destroy the insulation.It complies with the international standards of iec 60947-1.-2.-3.-4-5.1 Port:ningbo, shanghai Place of origin:zhejiang, china (mainland) Brand name:safesave Model number:snsx-250 Type:moulded case Poles number:1p, 2p, 3p, 4p Color:black Current:100-250 Certification:ccc/ce Rated voltage:690v Rated frequency:50/60 Standard:iec947-1, -2, -4, -5.1 Mechanical life:10000 times Packaging details: Standard export packing or according to the customer's requirements Delivery detail:within 20days