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The Live CB263B Double Pole MCB is the highest-capacity miniature circuit breaker in the CB series, designed to provide comprehensive protection for maximum-power single-phase circuits requiring simultaneous switching of both phase and neutral conductors. Rated at 63 Amps with a B-curve tripping characteristic, this 2-pole breaker represents the maximum current rating available, safeguarding both the phase and neutral conductors on AC systems up to 230/400V at 50/60Hz frequency. It features a powerful 10kA breaking capacity, making it suitable for installations with high prospective short-circuit currents near main distribution points. The B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of maximum-power resistive loads. With its robust construction and precision thermo-magnetic release, the CB263B ensures complete circuit isolation and equipment protection for the most demanding commercial and industrial applications requiring double pole switching at maximum capacity.
Complete Double Pole Protection: Simultaneously protects and switches both phase and neutral conductors, ensuring complete circuit isolation during fault conditions and maintenance.
Maximum 63A Rating: Highest capacity in the CB series for single-phase applications up to 14.5kW.
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 resistive loads with minimal inrush.
Peak Capacity 63A Protection: Ideal for main distribution feeders, large industrial heaters, high-power commercial cookers, and maximum-load catering equipment.
Complete Isolation: Neutral pole disconnects simultaneously with phase, preventing floating neutral conditions and ensuring safety during maintenance.
Industrial & Commercial Rating: 63A suits the most demanding applications in industrial facilities, large commercial kitchens, and main distribution boards.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on both 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 | CB263B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| 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 (both poles) |
| Neutral Pole Protection | Fully protected and switched |
| 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 double pole MCB with B-Curve?
Main distribution feeders for large commercial units, industrial duct heaters up to 14kW, high-power commercial cooking suites, large-scale water heating systems, and main isolation switches for heavy industrial resistive loads.
2. Can this 63A double pole breaker support a 14kW industrial heater?
Yes, a 14kW industrial heater at 230V draws approximately 60.9A, making this 63A maximum capacity breaker ideally sized with appropriate safety margin for continuous industrial operation.
3. What is the power capacity of this 63A maximum capacity double pole breaker?
Maximum resistive load: 14.5kW at 230V. Continuous load (80% rule): 11.6kW. Ideal for main distribution and the largest industrial heating applications requiring complete isolation.
4. What cable size is mandatory for 63A maximum capacity double pole circuits?
16mm² copper conductor MANDATORY - this matches the maximum terminal capacity. For runs over 15m, external termination with 25mm² is required. Never use smaller cable for 63A circuits.
5. Can this breaker serve as main switch for a large commercial kitchen?
Yes, it's ideal as a main isolation switch for large commercial kitchens requiring up to 14.5kW total resistive load, providing maximum single-phase capacity in the CB series with complete phase and neutral isolation.
