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The Live CB340B Triple Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for high-power three-phase electrical circuits with resistive loads. Rated at 40 Amps with a B-curve tripping characteristic, this 3-pole breaker safeguards all three phases (L1, L2, L3) on AC systems up to 400V at 50/60Hz frequency. It features a powerful 10kA breaking capacity, making it suitable for installations with higher prospective short-circuit currents. The B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of high-power industrial and commercial resistive loads. With its robust construction and precision thermo-magnetic release, the CB340B ensures equipment protection and operational safety for demanding industrial and commercial applications requiring three-phase protection at higher current ratings.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
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 (120A to 200A), specifically calibrated for high-power circuits with minimal inrush.
High-Capacity 40A Three-Phase Protection: Ideal for industrial heaters, large commercial kitchen suites, main distribution boards, and high-power resistive loads.
Wide Application Range: Suitable for industrial facilities, large restaurants, hotels, and commercial buildings requiring three-phase protection for high-power resistive loads.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all three 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 | CB340B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 40 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 (all poles) |
| 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 40A triple pole MCB with B-Curve?
Industrial duct heaters (up to 27kW), large commercial kitchen suites, main distribution boards for industrial facilities, high-power catering equipment, and large-scale resistive heating systems.
2. What is the power capacity of this 40A three-phase breaker?
Maximum resistive load: 27.71kW at 400V three-phase. Per phase capacity: 9.2kW at 230V. Suitable for large industrial heating applications and main distribution.
3. Can this breaker be used for main distribution in an industrial facility?
Yes, it's ideal as a main distribution breaker for small to medium industrial facilities, providing protection for multiple resistive loads with fast B-Curve response.
4. Why choose 10kA breaking capacity for 40A industrial circuits?
Provides enhanced protection in installations with higher fault currents, such as near main transformers in industrial settings where fault levels may exceed standard 6kA ratings.
5. What cable size is recommended for 40A three-phase circuits?
10mm² copper conductor minimum per phase. 16mm² recommended for longer runs or higher ambient temperatures. All three phase conductors must be same size. Terminals accept up to 16mm².
