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The Live CB163B Single Pole MCB is the highest-capacity miniature circuit breaker in the CB series, engineered to provide reliable protection for maximum power single-phase electrical circuits with predominantly resistive loads. Rated at 63 Amps with a B-curve tripping characteristic, this 1-pole breaker represents the maximum current rating available, safeguarding the phase conductor on AC systems up to 230V 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 large resistive loads. With its robust construction and precision thermo-magnetic release, the CB163B ensures equipment protection and operational safety for the most demanding high-power commercial and industrial resistive load applications.
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 large commercial water heaters, main distribution feeders, high-power lighting distribution, and industrial resistive heating systems.
Single Pole Configuration: Protects one phase conductor for single-phase 230V maximum capacity circuits.
Fast Fault Response: B-Curve provides quicker magnetic tripping for enhanced protection of sensitive equipment at maximum power levels.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response.
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 in demanding commercial environments.
Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CB |
| Model Number | CB163B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| 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 |
| 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 B-Curve single pole capacity?
Large commercial instant water heaters (14kW+), main distribution feeders for small commercial units, high-capacity lighting distribution boards, industrial resistive ovens, and large-scale electric boiler controls.
2. What is the maximum continuous power at 63A and the 80% rule?
Maximum resistive load: 14.5kW at 230V. For continuous operation (3+ hours), follow 80% rule: 50.4A continuous load (11.6kW) to prevent thermal stress and ensure long breaker life.
3. Why choose maximum capacity 63A B-Curve over C-Curve for resistive loads?
At maximum capacity, B-Curve provides faster fault clearance (189-315A trip) than C-Curve (315-630A), offering better protection for large resistive elements while responding to actual fault conditions more quickly.
4. What are the critical cable requirements for 63A maximum capacity 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 a main switch for a small commercial unit?
Yes, it's ideal as a main isolation switch for small shops, restaurants, and offices requiring up to 14.5kW total load, providing maximum single-phase capacity in the CB series.
