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The Live CB363C Triple Pole MCB is the highest-capacity industrial-grade miniature circuit breaker in the CB series, designed to provide reliable protection for maximum-power three-phase electrical circuits with the largest inductive loads. Rated at 63 Amps with a C-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 C-curve characteristic (5-10x In) provides excellent protection for circuits with the largest inductive loads while accommodating the massive inrush currents typical of the biggest industrial motors, heaviest pumps, and major machinery. With its robust construction and precision thermo-magnetic release, the CB363C ensures equipment protection and operational safety for the most demanding heavy industrial 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.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (315A to 630A), specifically calibrated for circuits with the largest inductive loads and massive inrush.
Peak Capacity 63A Three-Phase Protection with Extreme Inductive Tolerance: Ideal for the largest industrial pumps (up to 18.5kW+), biggest air compressors, major industrial HVAC chillers, heaviest conveyors, and largest machinery.
Inductive Load Capability: Handles massive inrush currents from the largest motor-driven equipment without nuisance tripping.
Heavy Industrial-Grade Protection: Suitable for the most demanding heavy industrial applications requiring maximum capacity three-phase 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 | CB363C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 63 Amperes (Maximum series rating) |
| Trip Curve Type | C Curve (5-10 × 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 C-Curve triple pole MCB?
Largest industrial pumps up to 18.5kW (25HP), biggest air compressors, major industrial HVAC chillers, heaviest conveyor systems, largest machine tool main drives, and massive industrial refrigeration compressors.
2. Can this 63A C-Curve breaker handle an 18.5kW three-phase industrial pump?
Yes, it's ideal for 18.5kW pumps at maximum capacity. The C-Curve tolerates starting currents up to 550-630A while the 63A rating provides excellent running protection without nuisance tripping.
3. What is the power capacity of this 63A maximum capacity three-phase C-Curve breaker?
Maximum three-phase load: 43.65kW at 400V. For motor applications, suitable for motors up to 18.5kW depending on starting characteristics and duty cycle at maximum capacity.
4. Why choose C-Curve over B-Curve for maximum capacity heavy industrial motor circuits?
C-Curve (5-10x In) handles starting currents up to 630A where B-Curve (3-5x In) would trip at 315A, making C-Curve essential for the largest industrial motors with highest locked-rotor currents.
5. What cable size is MANDATORY for 63A three-phase maximum capacity heavy industrial motor circuits?
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.
