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The Live CB250C Double Pole MCB is a heavy-duty industrial-grade miniature circuit breaker designed to provide comprehensive protection for the largest single-phase circuits requiring simultaneous switching of both phase and neutral conductors while handling massive inrush currents. Rated at 50 Amps with a C-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 C-curve characteristic (5-10x In) provides excellent protection for circuits with significant inductive loads while accommodating the inrush currents typical of the largest industrial motors, heaviest pumps, and major compressors. With its robust construction and precision thermo-magnetic release, the CB250C ensures complete circuit isolation and equipment protection for the most demanding industrial applications requiring double pole switching with substantial inductive load tolerance.
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.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (250A to 500A), specifically calibrated for circuits with the largest inductive loads and massive inrush.
Very High-Capacity 50A Protection with Extreme Inductive Tolerance: Ideal for largest single-phase motors (up to 10HP), heaviest industrial pumps, major compressors, and heavy industrial machinery.
Complete Isolation: Neutral pole disconnects simultaneously with phase, preventing floating neutral conditions and ensuring safety during maintenance.
Industrial Heavy-Duty Protection: Handles massive inrush currents from the largest motor-driven industrial equipment without nuisance tripping.
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 in demanding industrial 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 | CB250C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| Current Rating (In) | 50 Amperes |
| 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 (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 heavy industrial applications require a 50A C-Curve double pole MCB?
Largest single-phase motors up to 10HP (7.5kW), heaviest industrial pumps, major air compressors, large industrial mixers, heavy conveyor systems, and major machine tool main drives requiring neutral switching.
2. Can this 50A C-Curve breaker handle a 7.5kW industrial motor?
Yes, it's ideal for 7.5kW motors. The C-Curve tolerates starting currents up to 500A (6-7x FLC) while the 50A rating provides excellent running protection without nuisance tripping.
3. What is the advantage of double pole for heavy industrial machinery?
Double pole provides complete isolation of both phase and neutral, essential for safe maintenance of heavy industrial machinery per IEC 60204, especially where multiple power sources may be present and for equipment in harsh environments.
4. Why choose C-Curve over B-Curve for 50A heavy industrial motor circuits?
C-Curve (5-10x In) handles starting currents up to 500A where B-Curve (3-5x In) would trip at 250A, making C-Curve essential for the largest industrial motors with very high locked-rotor currents.
5. What cable size is mandatory for 50A C-Curve heavy industrial circuits?
10mm² copper conductor minimum. 16mm² strongly recommended for longer runs to minimize voltage drop during motor starting and for mechanical robustness. Terminals accept up to 16mm². Both phase and neutral must be same size.
