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Installation must be carried out by a qualified electrician.
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Suitable for indoor use.
The Live CA450B 4 Pole MCB is a high-capacity miniature circuit breaker engineered to provide comprehensive protection for large-scale three-phase commercial electrical distribution systems requiring simultaneous neutral conductor switching. Rated at 50 Amps with a B-curve tripping characteristic, this 4-pole breaker safeguards all three phases and the neutral conductor on AC systems up to 400V at 50/60Hz frequency. It delivers robust protection against overloads and short circuits, making it the ideal choice for large commercial main distribution boards, shopping centers, industrial commercial facilities, and high-power resistive load applications where complete isolation of all conductors is essential for safety compliance. With a substantial 6kA breaking capacity and precision thermo-magnetic release, the CA450B ensures safety and reliability for demanding large-scale commercial installations.
Complete 4-Pole Protection: Simultaneously protects and switches all three phases (L1, L2, L3) and the neutral (N) conductor, ensuring complete circuit isolation for high-power commercial applications.
High-Capacity B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (150A to 250A), calibrated for high-power resistive loads and main distribution applications.
Large Commercial Main Distribution Rating: 50A per phase provides substantial capacity for large commercial main distribution boards and high-power resistive equipment.
Integrated Neutral Switching: Neutral pole disconnects simultaneously with phases, preventing floating neutral conditions during maintenance.
Reliable Breaking Capacity: Certified 6kA rating ensures safe interruption of fault currents, protecting downstream equipment.
Precision Thermo-Magnetic Release: Thermal bimetal strip for overload protection and magnetic solenoid for short-circuit response across all four 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 commercial applications.
Professional Installation: DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Model Number | CA450B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 4 Pole (3P + N) |
| Current Rating (In) | 50 Amperes |
| Trip Curve Type | B Curve (3-5 × In) |
| Operational Voltage | 230/400V AC |
| Frequency Range | 50/60 Hertz |
| Short-Circuit Capacity | 6kA (6000 Amps) |
| 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) |
| Neutral Pole Protection | Switched neutral |
| Operating Temperature | -5°C to +40°C |
| Calibration Reference | 30°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standard | IEC 60898-1 |
1. What are the main applications for the CA450B 50A 4P MCB?
Large commercial main distribution boards, shopping center anchor tenancies, hotels, large restaurants, commercial water heating, HVAC mains, and high-power resistive loads.
2. What is the power capacity of this 50A 4-pole MCB?
Maximum resistive load: 34.6kW at 400V three-phase. Per phase capacity: 11.5kW at 230V. Continuous load (80% rule): 27.7kW.
3. Why choose B-Curve for commercial main distribution?
B-Curve (3-5x In) provides faster response for predominantly resistive loads (lighting, heating, general power) and excellent discrimination with downstream C-Curve breakers.
4. What cable size is recommended for 50A commercial circuits?
16mm² copper conductor recommended for runs up to 30m. For longer runs, use 25mm² with external termination (breaker accepts max 16mm²).
5. When is 4-pole switching required for commercial buildings?
TN-C-S to TN-S transition points, IT earthing systems, generator changeover panels, construction sites, marinas, and where local codes mandate complete isolation.
