Product Overview
The CJM1-63 Miniature Circuit Breaker (MCB) offers reliable overload and short-circuit protection for residential, commercial and light-industrial electrical installations. Built to IEC 60898-1 & EN 60898-1 international standards, this compact DIN-rail mounted circuit breaker safely cuts power when over-current faults occur, safeguarding wiring, home appliances, office equipment and preventing potential electrical fire hazards.
Designed for AC power networks at 50/60 Hz, CJM1-63 supports flexible pole options, multiple rated currents, plus B/C/D tripping curves to match different load types, making it a universal pick for distribution panel retrofits and new-build projects.
Core Advantages & Key Features
- ●B Curve: For resistive loads such as lighting & heating circuits
- ●C Curve: General-purpose for sockets, small motors and mixed residential-commercial loads
- ●D Curve: For high-inrush loads including transformers and large startup motors
- ●4500A breaking capacity (4.5kA): Safely interrupt short-circuit faults for standard building wiring systems.
- ●Compact 18 mm module width: Saves precious space inside distribution boxes.
- ●Rugged mechanical-electrical endurance: 4000 operation cycles, guaranteeing long-term service life.
- ●Broad working temperature: Operates reliably from -5 °C to +40 °C for varied indoor environments.
- ●Heavy-duty terminals: Both top and bottom terminals accept up to 25 mm² cables, tightening torque rated at 2 N-m.
- ●Standard 35 mm DIN-rail mounting: Quick installation, compatible with global standard electrical enclosures.
- ●Compatible with PIN busbar, easy for busbar distribution wiring.
- ●Compliance: IEC 60898-1, EN 60898-1 certified for global market acceptance.
Internal Construction
Inside each CJM1-63 unit, proven electromechanical components deliver dual protection:
- Bi-metal strip: Thermal element that trips for slow overload conditions
- Coil (solenoid): Magnetic element for instant short-circuit tripping
- Connecting wire & move contactor: Stable contact system for repeated switch-on / switch-off cycles.
Full Technical Specifications
| Item | Parameter |
|---|---|
| Model | CJM1-63 Miniature Circuit Breaker |
| Rated Current | 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A |
| Rated Voltage | 230/400VAC (240/415V) |
| Rated Frequency | 50 / 60 Hz |
| Number of Poles | 1P, 2P, 3P, 4P (1P+N, 3P+N) |
| Module Width | 18 mm per pole |
| Trip Curve | B, C, D |
| Breaking Capacity | 4500 A |
| Optimum Operating Temperature | -5 °C ~ 40 °C |
| Terminal Tightening Torque | 2 N-m |
| Terminal Cable Capacity | Max 25 mm² |
| Electro-mechanical Endurance | 4000 cycles |
| Mounting Type | 35 mm DIN Rail |
| Suitable Busbar | PIN Busbar |
| Standards | IEC 60898-1, EN 60898-1 |
Typical Applications
FAQ (Frequently Asked Questions)
Q: What is the difference between B, C and D curve MCB?
● B curve trips at 3-5× rated current: lighting, heating resistive loads.
● C curve trips at 5-10× rated current: most common for home sockets, fans and small motors.
● D curve trips at 10-20× rated current: for motors, transformers with heavy starting inrush current.
Q: Can CJM1-63 install with PIN busbar?
A: Yes, CJM1-63 is fully compatible with PIN-type busbar for fast multi-pole wiring.
Q: What is the mechanical lifetime of CJM1-63?
A: 4000 electro-mechanical operation cycles under rated condition.
Q: What maximum wire size fits this MCB?
A: Both upper and lower terminals accept cables up to 25 mm²; recommended tightening torque: 2 N-m.
About C&J Electrical
C&J Electrical focuses on R&D and manufacturing of low-voltage switchgear and protection components, supplying reliable circuit-protection solutions for industrial, commercial and infrastructure markets worldwide.
For more information on the MCB series, please visit our official website or contact our sales team.
Post time: Oct-14-2026