MCCB 3P 40A Circuit Breaker

Current Limiting Technology-test

U-shaped fixed contact design ensures pre-breaking to limit short-circuit current rise.

Reduces peak short-circuit current and I²t energy by up to 50% compared to standard breakers.

Modular Accessories

Compatible with shunt releases (F1-F4), under-voltage releases (Q1-Q4), and auxiliary switches.

Supports Modbus communication for integration with smart monitoring systems.

Compact Frame Design

125 frame class (75mm width) replaces traditional 63mm frames, saving panel space.

Horizontal or vertical installation flexibility.

High Durability

Thermal-magnetic trip unit ensures precise overload and short-circuit protection.

Corrosion-resistant materials withstand harsh environments (marine, damp, or high-vibration).

Applications

Industrial Power Distribution: Protect motors, HVAC systems, and machinery.

Marine & Offshore: Certified for shipboard vibration and saltwater exposure.

Renewable Energy: Solar/Wind farm circuit protection.

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.

Intelligent
YCM8 can be connected to Modbus communication system with special wire easily. With communication function, it can match with
monitoring unit accessories to realize the door display, reading, setting and control.

Arc extinguishing system is modular

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.