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Installation must be carried out by a qualified electrician.
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Suitable for indoor use.
The Live CA332B Triple Pole MCB is a high-capacity miniature circuit breaker engineered to protect heavy-duty electrical distribution systems in commercial and industrial environments. Rated at 32 Amps with a B-curve tripping characteristic, this 3-pole breaker operates flawlessly on AC systems up to 400V at 50/60Hz frequency. It delivers robust protection against overloads and short circuits, making it the preferred choice for high-power resistive loads, large commercial kitchens, and industrial heating applications. With a substantial 6kA breaking capacity and precision-engineered thermo-magnetic release, the CA332B ensures safety, reliability, and long-term performance for demanding electrical installations.
High-Current B-Curve Protection: Trips instantaneously at 3-5 times the rated current (96A to 160A), specifically calibrated for high-power resistive loads with negligible inrush currents.
Heavy-Duty Power Handling: 32A rating per pole makes it ideal for large commercial ovens, industrial water heaters, massive lighting banks, and high-capacity distribution feeders.
Commercial Grade Protection: Perfect for protecting circuits in hotels, hospitals, shopping malls, commercial kitchens, and large office complexes.
Substantial Breaking Capacity: Certified 6kA rating ensures safe interruption of high fault currents, protecting expensive downstream equipment and wiring infrastructure.
Precision Thermo-Magnetic Release: Combines thermal bimetal strip for accurate time-delayed overload protection and magnetic solenoid for instantaneous short-circuit response.
Superior Electrical Isolation: With 4000V impulse withstand rating and 500V insulation voltage, providing excellent protection against voltage transients and surges.
Extended Operational Life: Engineered for 8,000 electrical operations, ensuring decades of reliable service in commercial applications.
Professional Installation: Standard DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity for secure commercial panel integration.
| Specification | Details |
|---|---|
| Brand | Live |
| Model Number | CA332B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 32 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 |
| Operating Temperature | -5°C to +40°C (daily average ≤35°C) |
| Calibration Reference | 30°C |
| Storage Conditions | -25°C to +70°C |
| Electrical Lifespan | 8,000 cycles |
| Enclosure Protection | IP20 (finger-safe) |
| Terminal Capacity | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Certification Standard | IEC 60898-1 |
1. What are the primary applications for the Live CA332B 32A B-Curve MCB?
The CA332B is specifically designed for high-power resistive loads. Ideal applications include:
Commercial kitchen equipment (3-phase ovens, large griddles, industrial dishwashers)
Electric boilers and industrial water heating systems
Large-scale commercial lighting installations (sports halls, warehouses, retail spaces)
Distribution sub-feeders in hotels and hospitals
HVAC auxiliary heating elements
Large capacity socket outlets in workshops and commercial spaces
2. What is the maximum power capacity of this 32A 3-phase MCB?
For a standard 400V three-phase system, the CA332B can handle approximately:
Resistive load: P = √3 × V × I = 1.732 × 400V × 32A = 22.17 kW
For continuous operation, follow the 80% rule: maximum continuous load should not exceed 25.6A per phase, which equates to approximately 17.7 kW continuous resistive load.
Always verify actual load requirements against local electrical codes.
3. Why would I choose a 32A B-Curve MCB over a C-Curve for commercial applications?
For purely resistive commercial loads like electric ovens, water heaters, and large lighting installations, there are no significant inrush currents during startup. The B-Curve provides faster magnetic tripping response (3-5x In) compared to C-Curve (5-10x In), offering superior sensitivity and protection for these applications. It ensures that any actual fault condition is cleared more rapidly, reducing potential damage to equipment.
4. Can this MCB be used for motor protection in industrial settings?
Generally, the CA332B B-Curve is not recommended for motor protection. Motors draw significant inrush current during startup (6-8x running current), which would likely cause nuisance tripping with a B-Curve breaker. For motor circuits of this capacity, a C-Curve or D-Curve breaker would be more appropriate. The CA332B is optimized for resistive loads only.
5. How does the 32A rating affect cable sizing requirements?
For a 32A MCB, the connected cables must be appropriately sized to handle the current safely. According to standard wiring practices, you should use:
Minimum copper conductor size: 6 mm² for standard installations
Recommended copper conductor size: 10 mm² for runs with moderate length
The CA332B terminal accepts cables up to 16 mm², allowing for proper conductor sizing
Always ensure cable insulation rating matches the installation environment and complies with local electrical regulations to prevent overheating and fire hazards.
