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Installation must be carried out by a qualified electrician.
Ensure power is switched off before installation.
Suitable for indoor use.
The Live CA320B Triple Pole MCB is a premium-grade miniature circuit breaker designed to provide reliable protection for high-capacity electrical distribution systems. Rated at 20 Amps with a B-curve tripping characteristic, this 3-pole breaker is engineered for AC networks operating at 50/60Hz with voltages up to 400V. It offers comprehensive protection against overloads and short circuits, making it the ideal choice for commercial lighting circuits, large residential complexes, and resistive heating applications. With a robust 6kA breaking capacity and precision thermo-magnetic technology, the CA320B ensures safety, durability, and peace of mind for your electrical infrastructure.
High-Current B-Curve Protection: Trips instantaneously at 3-5 times the rated current (60A to 100A), specifically calibrated for high-power resistive loads and lighting circuits with minimal inrush currents.
Enhanced Power Handling: 20A rating per pole makes it suitable for heavy-duty lighting banks, commercial water heaters, large ovens, and high-capacity socket outlets in hotels and offices.
Superior Breaking Capacity: Certified 6kA rating ensures safe interruption of high fault currents, protecting downstream wiring and connected equipment.
Precision Thermo-Magnetic Release: Combines thermal bimetal strip for accurate time-delayed overload protection and magnetic solenoid for instantaneous short-circuit response.
Excellent Dielectric Strength: Withstands impulse voltages up to 4000V and test voltages of 2kV, ensuring safety during voltage transients and surge events.
Durable Construction: Engineered for 8,000 electrical operations, providing long-term reliability in commercial and industrial environments.
Easy Installation: Compact DIN-rail design with IP20 finger-safe terminals and 16mm² wiring capacity for quick and secure panel integration.
| Specification | Details |
|---|---|
| Brand | Live |
| Model | CA320B |
| Product Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Rated Current (In) | 20 Amps |
| Tripping Curve | Type B (3-5 x In) |
| Rated Voltage (Ue) | 230/400V AC |
| Rated Frequency | 50/60 Hz |
| Ultimate Breaking Capacity | 6kA (6000A) |
| Insulation Voltage (Ui) | 500V |
| Rated Impulse Voltage (Uimp) | 4000V (1.2/50µs) |
| Dielectric Test Voltage | 2kV for 1 minute |
| Release Type | Thermo-magnetic |
| Operating Temperature | -5°C to +40°C (Daily avg ≤35°C) |
| Calibration Temperature | 30°C |
| Storage Temperature | -25°C to +70°C |
| Electrical Endurance | 8,000 cycles |
| Protection Class | IP20 (Finger-safe) |
| Terminal Capacity | 16 mm² (Max) |
| Mounting Style | DIN Rail (35mm) |
| Standards Compliance | IEC 60898-1 |
1. What specific applications are best suited for the Live CA320B 20A B-Curve MCB?
The CA320B is specifically designed for high-power resistive loads. Ideal applications include:
Large commercial lighting circuits (LED banks, fluorescent lighting)
Electric water heaters and storage geysers (3-phase)
Commercial kitchen equipment (ovens, toasters, grills)
High-capacity socket outlets in offices and conference halls
Heating, ventilation, and air conditioning (HVAC) auxiliary heaters
2. Why choose a 20A B-Curve MCB over a C-Curve for lighting applications?
For pure lighting circuits with electronic drivers (LEDs) or standard incandescent/fluorescent fittings, the inrush current is minimal. The B-Curve (3-5x In) provides faster magnetic tripping response compared to C-Curve (5-10x In), offering better sensitivity and protection for sensitive electronic components while still handling normal startup currents.
3. Can this 20A Triple Pole MCB be used for a 3-phase air conditioning unit?
Yes, but with caution. The CA320B is suitable for the power supply protection of larger split AC units or small package AC units that are primarily resistive in their power draw. However, if the AC unit has a large hermetic compressor with high starting current, a C-Curve breaker (like the CA320C) would be more appropriate to prevent nuisance tripping during startup.
4. What is the maximum power (kW) this 20A 3P MCB can handle?
For a 3-phase 400V system, the maximum power capacity is approximately:
** resistive load:** P = √3 × V × I = 1.732 × 400V × 20A = 13.86 kW
Always ensure the connected load does not exceed 80% of the breaker rating for continuous use as per electrical safety standards (continuous load should not exceed 16A for a 20A breaker).
5. How does the ambient temperature affect the performance of the CA320B?
The CA320B is calibrated at 30°C. If the ambient temperature inside the panel consistently exceeds 40°C, the thermal element (bimetal strip) may become more sensitive, causing the breaker to trip at currents slightly lower than 20A. Ensure adequate ventilation in the panel and consider derating if installing in consistently hot environments. The safe operating range is -5°C to +40°C.
