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The Live CB363B Triple Pole MCB is the highest-capacity miniature circuit breaker in the CB series, designed to provide reliable protection for maximum-power three-phase electrical circuits with resistive loads. Rated at 63 Amps with a B-curve tripping characteristic, this 3-pole breaker represents the maximum current rating available, safeguarding all three phases (L1, L2, L3) on AC systems up to 400V at 50/60Hz frequency. It features a powerful 10kA breaking capacity, making it suitable for installations with higher prospective short-circuit currents. The B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of maximum-power industrial and commercial resistive loads. With its robust construction and precision thermo-magnetic release, the CB363B ensures equipment protection and operational safety for the most demanding industrial and commercial applications requiring three-phase protection at maximum current ratings.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
Maximum 63A Rating: Highest capacity in the CB series for three-phase applications up to 43.6kW.
High 10kA Breaking Capacity: Powerful fault current interruption for installations with high prospective short-circuit currents up to 10,000 amps.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (189A to 315A), specifically calibrated for maximum-power circuits with minimal inrush.
Peak Capacity 63A Three-Phase Protection: Ideal for main distribution boards, large industrial heaters (up to 43kW), heavy commercial facilities, and maximum-scale resistive loads.
Wide Application Range: Suitable for heavy industrial facilities, large commercial buildings, and main distribution applications requiring maximum current resistive load protection.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all three poles.
Superior Electrical Isolation: 4000V impulse withstand rating and 500V insulation voltage for protection against voltage transients.
Extended Operational Life: 8,000 electrical operations for long-term reliability.
Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CB |
| Model Number | CB363B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 63 Amperes (Maximum series rating) |
| Trip Curve Type | B Curve (3-5 × In) |
| Operational Voltage | 230/400V AC |
| Rated Breaking Capacity | 10kA (10000 Amps) |
| Frequency Range | 50/60 Hertz |
| Insulation Rating (Ui) | 500 Volts |
| Impulse Withstand (Uimp) | 4000 Volts (1.2/50 µs) |
| Dielectric Test Voltage | 2kV for 60 seconds |
| Protection Mechanism | Thermo-magnetic (all poles) |
| Operating Temperature | -5°C to +40°C (daily average ≤35°C) |
| Calibration Reference | 30°C |
| Storage Temperature | -25°C to +70°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require the maximum 63A triple pole MCB with B-Curve?
Main distribution boards for large industrial facilities, massive industrial duct heaters (up to 43kW), large commercial building mains, heavy-duty catering facilities, and maximum-scale resistive heating systems.
2. What is the power capacity of this 63A maximum capacity three-phase breaker?
Maximum resistive load: 43.65kW at 400V three-phase. Per phase capacity: 14.5kW at 230V. Suitable for the largest industrial heating applications and main distribution at maximum capacity.
3. Can this breaker be used as a main switch for a large industrial facility?
Yes, it's ideal as a main isolation breaker for medium to large industrial facilities within the 63A capacity, providing protection for multiple high-power resistive loads with fast B-Curve response.
4. Why choose 10kA breaking capacity for 63A maximum capacity main distribution?
Provides essential protection in installations with highest fault currents, such as near main transformers in large industrial settings where fault levels may approach 10kA.
5. What cable size is MANDATORY for 63A three-phase circuits at maximum capacity?
16mm² copper conductor MANDATORY per phase - this matches the maximum terminal capacity. For runs over 15m, external termination with 25mm² or 35mm² is required. All three phase conductors must be same size. Never use smaller cable for 63A circuits.
