The Live CA350C Triple Pole MCB is a heavy-duty industrial-grade miniature circuit breaker engineered to serve as a main isolation and protection device for demanding industrial electrical systems. Rated at 50 Amps with a C-Curve tripping characteristic, this 3-pole breaker operates reliably on AC systems up to 400V at 50/60Hz frequency. It delivers robust protection against overloads and short circuits, specifically designed for circuits powering large inductive loads, main distribution feeders, and heavy machinery in industrial environments. With a formidable 6kA breaking capacity and precision-engineered thermo-magnetic release, the CA350C ensures operational continuity and equipment safety in factories, processing plants, and heavy commercial facilities.

Key Features of Live CA350C 50A MCB

• Industrial-Grade C-Curve Characteristic: Trips instantaneously at 5-10 times the rated current (250A to 500A), perfectly calibrated to handle the massive start-up surges of large industrial loads without nuisance tripping.

• Heavy-Duty Inductive Load Protection: Specifically designed for large 3-phase motors (25-30HP), industrial compressors, large pumps, HVAC chillers, conveyors, and heavy machinery.

• Main Distribution Capability: 50A rating per pole makes it ideal for main switch applications in small factories, industrial sub-distribution boards, and heavy commercial installations.

• High Fault Current Interruption: Certified 6kA breaking capacity ensures safe and reliable disconnection under severe short-circuit conditions, protecting expensive industrial equipment and wiring.

• Precision Thermo-Magnetic Mechanism: Features a heavy-duty bimetallic strip for accurate time-delayed overload protection and a robust solenoid coil for instantaneous short-circuit response.

• Substantial Power Handling: 50A rating per pole makes it suitable for main distribution feeders, large industrial machines, and critical process equipment.

• Superior Dielectric Strength: Withstands impulse voltages up to 4000V and test voltages of 2kV, ensuring safety during voltage spikes and lightning surges in industrial environments.

• Durable Industrial Construction: Rated for 8,000 electrical operations, providing long-term reliability in harsh industrial settings with regular switching requirements.

• Professional Installation: Compact DIN-rail design with IP20 finger-safe terminals and 16mm² wiring capacity for secure industrial panel integration.

Technical Specifications

Frequently Asked Questions (FAQs)

1. What types of industrial equipment are best protected by the Live CA350C 50A C-Curve MCB?
The CA350C is specifically engineered for heavy industrial loads. Ideal applications include:

• Large 3-phase induction motors (25HP to 30HP / 18.5kW to 22kW)

• Industrial air compressors and large refrigeration compressors

• Large centrifugal and submersible pumps (borewell pumps, irrigation pumps)

• HVAC chillers and large air handling units for industrial facilities

• Conveyor systems and industrial material handlers

• Plastic injection molding machinery

• Industrial extruders and mixers

• Large workshop machinery (heavy lathes, milling machines, planers)

• Main distribution feeders for small to medium industrial units

2. What is the maximum motor power (HP/kW) this 50A 3P MCB can support?
For a 400V 3-phase motor with typical efficiency and power factor, a 50A C-Curve MCB can generally support:

• Induction motors (DOL start): Up to 22kW (30HP) under standard starting conditions

• Induction motors (Star-Delta start): Up to 30kW (40HP) due to reduced starting current

• High-efficiency motors: May support up to 25kW (33HP) depending on starting characteristics
  However, motor starting current (Locked Rotor Current) can vary significantly by manufacturer and design. Always verify the motor nameplate data, starting method (DOL vs. Star-Delta), and consult local electrical codes for proper sizing. For motors with high starting currents, consider using a D-Curve breaker or implementing soft-starters.

3. How does the 50A C-Curve handle the substantial starting currents of large motors?
Large industrial motors (25-30HP) typically draw 6 to 8 times their full-load current during startup. For a 50A motor, this starting surge could reach 300A to 400A. The C-Curve characteristic (5-10x In) allows currents up to 500A for brief moments without tripping the magnetic mechanism. The thermal element also has a built-in time delay, giving the motor sufficient time (typically 3-15 seconds depending on load inertia) to reach running speed before the breaker would trip from overload. This precise engineering prevents nuisance tripping while maintaining full fault protection. For particularly hard-starting loads, consider Star-Delta starters or soft-starters to reduce inrush current.

4. Can this 50A MCB be used as a main breaker for an industrial facility?
Yes, the Live CA350C is an excellent choice as a main isolation and protection device for small to medium industrial facilities, workshops, and manufacturing units. When used as a main breaker:

• Capacity assessment: 50A at 400V provides approximately 34.6kW of power, suitable for facilities with moderate power requirements

• Coordination: Ensures proper discrimination with downstream breakers (smaller C-Curve or D-Curve for specific loads)

• Load composition: Ideal for facilities with significant motor loads, compressors, and industrial equipment

• Future expansion: Consider whether 50A provides adequate capacity for planned equipment additions

• Selective coordination: Work with a qualified electrical engineer to ensure the main breaker coordinates with all downstream protection devices

5. What are the cable sizing and installation requirements for a 50A industrial MCB?
For a 50A MCB in industrial applications, proper cable sizing and installation are critical:
Cable Sizing:

• Minimum copper conductor: 10 mm² for very short runs with proper ventilation

• Recommended copper conductor: 16 mm² for standard industrial installations (maximizes terminal capacity)

• For longer runs (over 20 meters): Consider 25 mm² or 35 mm² cable (requires external termination as breaker accepts only 16mm²)

• Voltage drop: For 50A loads, voltage drop must be kept below 3-5% depending on application

Installation Considerations:

• The CA350C terminals accept cables up to 16 mm² maximum directly

• For larger cables, use a separate terminal enclosure, distribution block, or busbar system

• Consider ambient temperature in industrial panels (may require derating)

• Ensure proper torque settings for terminal connections as specified

• Use appropriate cable glands and supports for cable weight