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The Live CB150B Single Pole MCB is a high-capacity miniature circuit breaker engineered to provide reliable protection for very high-power single-phase electrical circuits with predominantly resistive loads. Rated at 50 Amps with a B-curve tripping characteristic, this 1-pole breaker safeguards 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 resistive loads. With its robust construction and precision thermo-magnetic release, the CB150B ensures equipment protection and operational safety for high-power commercial and industrial resistive load applications.
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 (150A to 250A), specifically calibrated for resistive loads with minimal inrush.
Very High-Capacity 50A Protection: Ideal for large commercial water heaters, high-power lighting distribution, and resistive heating systems.
Single Pole Configuration: Protects one phase conductor for single-phase 230V high-capacity circuits.
Fast Fault Response: B-Curve provides quicker magnetic tripping for enhanced protection of sensitive equipment.
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 | CB150B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| Current Rating (In) | 50 Amperes |
| 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 benefit from a 50A B-Curve single pole breaker?
Large commercial water heaters (10-11kW), high-power lighting distribution boards, industrial resistive ovens, large-scale infrared heating systems, and electric boiler controls.
2. Why choose B-Curve over C-Curve for 50A resistive loads?
B-Curve (3-5x In) provides faster fault clearance (150-250A trip) than C-Curve (5-10x In), offering better protection for sensitive resistive elements while responding to actual fault conditions more quickly.
3. What is the maximum continuous load for this 50A breaker?
For continuous operation (3+ hours), follow the 80% rule: maximum 40A continuous load (9.2kW). This prevents thermal stress and ensures long breaker life in commercial applications.
4. Can this breaker protect a large commercial kitchen water heater?
Yes, most large commercial water heaters up to 11kW draw approximately 48A, making this 50A B-Curve breaker ideally sized for fast protection of resistive heating elements.
5. What cable size is required for 50A high-capacity circuits?
10mm² copper conductor minimum. 16mm² recommended for runs over 20m or high ambient temperatures. Terminals accept up to 16mm² directly for secure installation.
