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The Live CB250B Double Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide comprehensive protection for very high-power single-phase circuits requiring simultaneous switching of both phase and neutral conductors. Rated at 50 Amps with a B-curve tripping characteristic, this 2-pole breaker safeguards 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 very high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CB250B ensures complete circuit isolation and equipment protection for demanding commercial and industrial applications requiring double pole switching for high-current circuits.
Complete Double Pole Protection: Simultaneously protects and switches both phase and neutral conductors, ensuring complete circuit isolation during fault conditions and maintenance.
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 very high-power resistive loads with minimal inrush.
Very High-Capacity 50A Protection: Ideal for large industrial heaters (11kW+), high-power commercial cookers, main distribution feeders, and large-scale catering equipment.
Complete Isolation: Neutral pole disconnects simultaneously with phase, preventing floating neutral conditions and ensuring safety during maintenance.
Industrial & Commercial Rating: 50A suits demanding applications in industrial facilities, large restaurants, hotels, and commercial buildings.
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 | CB250B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| 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 (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 a 50A double pole MCB with B-Curve?
Large industrial duct heaters (11-11.5kW), high-power commercial cooking suites, main distribution feeders for commercial units, large-scale water heating systems, and industrial resistive heating banks.
2. Can this 50A double pole breaker support an 11kW industrial heater?
Yes, an 11kW industrial heater at 230V draws approximately 47.8A, making this 50A breaker ideally sized with appropriate safety margin for continuous industrial operation.
3. What is the power capacity of this 50A double pole breaker?
Maximum resistive load: 11.5kW at 230V. Continuous load (80% rule): 9.2kW. Ideal for large industrial heating applications and main commercial distribution requiring complete isolation.
4. Why choose double pole for industrial heating equipment?
Double pole provides complete isolation of both phase and neutral, essential for safe maintenance of industrial heating equipment where high temperatures and multiple service access points create additional safety requirements.
5. What cable size is mandatory for 50A double pole circuits?
10mm² copper conductor minimum. 16mm² recommended for longer runs or high ambient industrial environments. Terminals accept up to 16mm² directly. Both phase and neutral conductors must be same size.
