The design of the CNSV series of MCCB (shorted as moulded case circuit breaker) reflects the latest current limiting principle and manufacturing technology, characterized by compact structure, full modularization, high breaking, and zero arc cover. Its rated insulation voltage is 750V, rated operating voltage is AC50/60Hz, 690V and below rated working current up to 630A. It's used to generate infrequent conversions and motor startup. A circuit breaker is equipped with an overload short circuit and under voltage protection devices, so as to protect the circuit and type compact power equipment from damage.

International standards

• EC947-1: general rules
• EC947-2: circuit breakers
• EC947-4: contactors and motor starters
• lEC947-5.1: control circuit devices and switching elements; automatic control components.

National standards

• GB14048.1: general rules
• GB14048.2: circuit breakers

• The altitude below 2,000m;
• Circuit Breaker may be used between -25ºC and +70ºC. For temperatures higher than 40ºC (65ºC for circuit breakers used to protect motor feeders), devices must be derated;
• It can withstand the impact of humid air, salt spray, oil mist, and mold;
• It should be installed in places with no danger of explosion, and no conductive dust, and no substance enough to corrode metal or damage the insulation;
• In places with no rain and snow erosion;
• Pollution degree 3;
• Installation category III