Reliable circuit protection forms the backbone of safe power distribution for homes and light commercial premises. The CJM5-63 miniature circuit breaker (MCB) delivers robust overload and short circuit protection, serving as an ideal main switch for household and similar electrical installations. Built to international standards, this compact DIN-rail MCB supports broad current ranges, multiple trip curves, and high short circuit breaking performance for global low voltage projects.
As demand rises for space saving, dependable AC circuit breakers, the CJM5-63 series stands out with a 6000A (6kA) short circuit breaking capacity, effectively cutting fault currents to defend wiring and connected equipment from electrical damage. Engineers, panel builders and electrical contractors can select exact configurations to match diverse load requirements.
★ Core Advantages of the CJM5-63 MCB
- ✔ Contact position indication: Clear visual status shows breaker ON/OFF status for safer inspection and troubleshooting.
- ✔ Compact 18 mm module size per pole, maximizing space inside distribution boxes.
- ✔ Simple mounting on standard 35 mm DIN Rail, compatible with PIN busbar systems for fast panel assembly.
- ✔ High mechanical electrical endurance rated for 4000 operation cycles, ensuring long service life under regular switching.
- ✔ Wide working ambient temperature from -5 °C to 40 °C, delivering stable performance across typical indoor environments.
This 6kA MCB works well as the primary incoming main switch or branch circuit protection within domestic apartments, retail outlets, and light commercial electrical cabinets.
Complete Technical Specifications of CJM5 63
Every key parameter complies with IEC60898-1 and EN60898-1 international safety standards for miniature circuit breakers.
| Item | Specification |
|---|---|
| Rated Current | 6A,10A,16A,20A,25A,32A,40A,50A,63A |
| Rated AC Voltage | 230/400VAC (240/415V) |
| Rated Frequency | 50/60Hz |
| Pole Options | 1P, 2P, 3P,4P (1P+N, 3P+N) |
| Trip Curve Types | B curve, C curve, D curve |
| Breaking Capacity | 6000A (6kA) |
| Single pole Module Width | 18 mm |
| Operating Temperature | -5 °C ~ 40 °C |
| Terminal Tightening Torque | 2.5 N.m |
| Top & Bottom Terminal Capacity | 25 mm² copper cable |
| Endurance Cycles | 4000 electro-mechanical cycles |
| Mounting | 35 mm DIN Rail, suitable for PIN Busbar |
Multiple trip curve options (B, C, D) allow matching different load types:
- B curve MCB: For resistive household loads; trips at 3 5× rated current.
- C curve MCB: General purpose for lighting and common appliances; trips at 5 10× rated current.
- D curve MCB: For motor and high inrush equipment; trips at 10 20× rated current.
Application Scenarios for CJM5-63 Miniature Circuit Breaker
Thanks to flexible pole choices and current ratings up to 63A, this 6kA MCB fits many low-voltage distribution projects:
- Household distribution box main switch and branch circuit protection
- Small office and retail commercial power panels
- Light industrial auxiliary circuits
- OEM electrical cabinet assembly for export oriented markets
The 25 mm² terminal capacity accepts heavy gauge input output wiring, and the specified 2.5 N.m torque requirement helps installers achieve secure, heat reduced cable connections.
Why Choose CJM5-63 MCB for Your Project
When selecting DIN rail miniature circuit breakers, compliance, breaking capacity, size and trip characteristics are critical buying factors. The CJM5 63 checks all boxes:
- Certified to IEC / EN 60898-1, supporting global market acceptance.
- 6kA high short circuit withstand capability for reliable fault interruption.
- Full selection of poles, currents and B/C/D trip curves to cover resistive, inductive and motor type loads.
- Slim 18 mm per pole module for space constrained distribution enclosures.
- Visible contact position indicator improves site safety during maintenance work.
- Compatibility with standard 35 mm DIN rail and PIN busbar streamlines panel building workflows.
Safety and installation flexibility are key for modern low voltage distribution. The CJM5-63 miniature circuit breaker gives contractors a versatile, standard compliant option for both residential and light commercial protection jobs.
— Product Engineering Team
Frequently Asked Questions
Q1: What does the breaking capacity of 6000A (6kA) mean for this MCB?
A: It means the CJM5 63 miniature circuit breaker can safely interrupt short circuit fault currents up to 6000 Amperes without internal damage.
Q2: Can I use CJM5-63 as a main house switch?
A: Yes, the product is explicitly designed to act as a main switch for household and similar installations, with maximum rated current reaching 63A.
Q3: What trip curve should I pick?
A: Use B curve for pure resistive home circuits; C curve for lights and standard appliances; D curve for motors or devices with large starting inrush current.
Q4: Is this breaker compatible with PIN busbar?
A: Yes, CJM5 63 supports PIN Busbar and standard 35 mm DIN-rail mounting.
About C&J Electrical
We are a professional manufacturer focusing on low voltage electrical components, supplying high quality MCB, RCD and distribution accessories for worldwide distributors, electrical contractors and system integrators. Our products strictly follow international safety standards to guarantee stable circuit protection performance for household and commercial projects.
Post time: Nov-05-2026