CNC | YCM8-HU Molded Case Circuit Breaker

MCCB stands for Molded Case Circuit Breaker. It is a type of circuit breaker that is commonly used in electrical distribution systems to protect circuits and electrical equipment from overcurrent and short circuits. MCCBs are designed to provide automatic and manual means of switching and isolating circuits in case of faults or overloads.

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 2: Modular accessories

The size of accessories is same for YCM8 with same frame.
You can choose the accessories according to your needs to extend the function of YCM8.

Feature 3: Frame miniaturization
5 frame class: 125 type, 160 type, 250 type, 630 type, 800 type
The rated current of YCM8 series: 10A~1250A

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.

Feature 5: 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.

Feature 6: Arc extinguishing system is modular