CCM8 Series MCCB

Feature

Feature 1: Current limiting ability
Limiting the rise of short circuit current of circuit. The peak short circuit current and I2t power are much lower than the value expected.

U shape fixed contact design
The U shape fixed contact design achieves the technique of pre-breaking:
When the short circuit current pass through the contact system, there are forces that repel each other on the fixed contact and moving contact. The forces were produced with short circuit current synchronous and enlarge while short circuit current enlarge. The forces make the fixed contact and moving contact apart before tripping. They elongated the electric arcing to enlarge their equivalent resistance to limit the rise of short circuit current.

Feature 4: Contact repulsion
The technical scheme:
See figure1, this new contact device is mainly consist of fixed contact, moving contact, shaft 1, shaft 2, shaft 3 and spring.
When the circuit breaker is closed, shaft 2 is at the right of spring angle. When there is large fault current, the moving contact rotate around the shaft 1 under the electric repulsion caused by current itself. When shaft 2 rotate over the top of spring angle, the moving contact rotate upward quickly under the reaction of spring and breaking the circuit fast. The breaking capacity is improved with the optimized contact structure.

Working Environment and Installation Condition

• Altitude: Below 2000m
• Temperature: The temperature of media is not higher than 40℃ ( +45℃ for marine products) and not lower than -5℃.
• Can withstand the bad environment of damp air, mold, radiation.
• The maximum inclination is 22.5 degree.
• Can work reliably under normal vibration of ship.
• Can work reliably under earthquake(4g).
• Should be no rain and snow hit.
• The media should be no explosion danger and no gas which can corrode the metal or destroy the insulating or conductive dust.