The Live CA363B Triple Pole MCB is the highest-capacity miniature circuit breaker in the CA series, engineered to serve as a main isolation and protection device for large commercial and light industrial electrical installations. Rated at 63 Amps with a B-curve tripping characteristic, this 3-pole breaker represents the maximum current rating available in the CA family, operating reliably 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 main distribution boards, large commercial complexes, and high-capacity resistive loads. With a substantial 6kA breaking capacity and precision-engineered thermo-magnetic release, the CA363B ensures safety, reliability, and long-term performance for mission-critical electrical infrastructure where maximum power delivery is required.

Key Features of Live CA363B 63A MCB

• Maximum Capacity B-Curve Protection: Trips instantaneously at 3-5 times the rated current (189A to 315A), specifically calibrated for the highest power resistive loads and main distribution applications within the CA series.

• Peak Power Distribution: 63A rating per pole represents the maximum current available in the CA range, ideal for main switch applications in large commercial establishments, small industrial units, and high-capacity sub-distribution boards.

• Large Commercial Infrastructure Protection: Perfect for protecting circuits in shopping malls, large restaurants, community centers, schools, small factories, and multi-story residential buildings requiring maximum power delivery.

• Maximum Breaking Capacity: Certified 6kA rating at 63A ensures safe interruption of high fault currents, protecting expensive downstream equipment and wiring infrastructure at the highest power levels.

• Precision Thermo-Magnetic Release: Combines thermal bimetal strip for accurate time-delayed overload protection and magnetic solenoid for instantaneous short-circuit response at maximum current ratings.

• Superior Electrical Isolation: With 4000V impulse withstand rating and 500V insulation voltage, providing excellent protection against voltage transients and power surges at full capacity.

• Extended Operational Life: Engineered for 8,000 electrical operations, ensuring decades of reliable service in commercial applications with regular switching requirements at maximum ratings.

• Professional Installation: Standard DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity for secure commercial panel integration at peak current levels.

Technical Specifications

Frequently Asked Questions (FAQs)

1. What are the primary applications for the Live CA363B 63A B-Curve MCB?
The CA363B is the highest capacity MCB in the CA series, specifically designed for main distribution and maximum power resistive loads. Ideal applications include:

• Main switch/isolation for large commercial sub-distribution boards requiring maximum capacity

• Large shopping mall tenant distribution

• Community halls and auditorium electrical mains at full capacity

• School and college building main distribution

• Small factory and workshop main switchgear

• Large commercial kitchen complexes with multiple high-power appliances

• Electric vehicle charging station infrastructure (multiple chargers)

• Large-scale commercial building services

• High-capacity water heating systems for hotels, hostels, and institutions

• Maximum capacity lighting distribution for large warehouses and exhibition halls

2. What is the maximum power capacity of this 63A 3-phase MCB?
For a standard 400V three-phase system, the CA363B represents the maximum power handling in the CA series:

• Maximum resistive load: P = √3 × V × I = 1.732 × 400V × 63A = 43.65 kW

• For continuous operation (80% rule): Maximum continuous load should not exceed 50.4A per phase, which equates to approximately 34.92 kW continuous resistive load.

• This makes it suitable as a main breaker for large commercial establishments, small factories, and multi-tenant residential complexes requiring maximum power delivery within the CA series range.

3. Why is the CA363B 63A B-Curve ideal for maximum capacity main distribution applications?
As a main switch at the maximum rating of the CA series, the B-Curve characteristic provides several advantages:

• Maximum power handling: 63A per phase delivers the highest possible power (43.65 kW) within the CA series

• Faster fault clearance at high currents: Responds more quickly to short-circuit conditions (3-5x In), limiting potential damage at maximum power levels

• Optimal coordination: Provides excellent discrimination with downstream C-Curve breakers protecting motor circuits

• Simplified distribution: One 63A main breaker can feed multiple sub-distribution boards, reducing panel complexity

• Future-proofing: Maximum rating provides headroom for future load additions

• Suitable for mixed loads: When the predominant loads are resistive (lighting, heating, general power), B-Curve offers optimal protection at the highest capacity

4. Can this 63A MCB be used as a main breaker for a small industrial unit with mixed loads?
Yes, the Live CA363B is well-suited as a main isolation and protection device for small industrial units, workshops, and light manufacturing facilities requiring maximum power. However, careful consideration should be given to:

• Load composition analysis: If significant motor loads are present (over 40% of total load), consider coordination requirements

• Starting current accumulation: If multiple large motors start simultaneously, the cumulative inrush current could approach the magnetic trip threshold (315A)

• Discrimination: Ensure proper coordination with downstream C-Curve or D-Curve breakers for motor circuits

• Power factor consideration: For mixed loads, the actual power delivered may be slightly less than 43.65 kW due to power factor

• Voltage drop: At 63A, voltage drop over distance must be carefully calculated

• Professional coordination study: For complex installations with significant motor loads, consult a qualified electrical engineer for proper coordination

5. What are the critical cable sizing considerations for a 63A main breaker installation?
For a 63A MCB in commercial or industrial applications, proper cable sizing is absolutely critical for safety, compliance, and performance:
Cable Sizing Requirements:

• Minimum copper conductor: 16 mm² for standard installations (matches terminal capacity)

• Recommended copper conductor: 16 mm² for optimal terminal compatibility and performance

• For longer runs (over 15 meters): Consider 25 mm² or 35 mm² cable (requires external termination as breaker accepts only 16mm²)

• Voltage drop calculation: For 63A loads over 30 meters at 400V, voltage drop with 16mm² cable is approximately:

  • 16mm²: ~2.5% drop (acceptable but near limit)

  • 25mm²: ~1.6% drop (preferred for longer runs)

• Temperature derating: In high ambient temperatures, cable ampacity must be derated

Important Installation Notes:

• The CA363B terminals accept cables up to 16 mm² maximum directly

• For 25mm² or larger cables, use:

  • External terminal enclosure with appropriate connectors

  • Distribution block mounted separately

  • Busbar system designed for higher currents

• Consider parallel runs of 16mm² cable if maintaining direct termination is required

• Ensure proper torque settings for terminal connections (typically 2.5-3.5 Nm)

• Use appropriate cable glands and supports for cable weight at 63A

• Consider aluminum cables only if specifically approved and with appropriate anti-oxidation compounds