Circuit breaker 3‑pole Hager MC363A, 63 A, C‑characteristic, 6 kA breaking capacity

Hager MC363A three‑pole miniature circuit breaker rated 63 A provides thermal‑magnetic protection for three‑phase circuits in residential and light commercial electrical installations. With a C‑characteristic trip curve and 6 kA rated breaking capacity, this device is intended for distribution boards where coordinated overload and short‑circuit protection is required. The unit is designed for DIN‑rail mounting and standard screw or clamp terminals to fit common panel layouts.

Advantages

The circuit breaker combines a 63 A continuous rating with a C‑type tripping characteristic to ensure reliable protection for moderately inductive loads such as motors, lighting and general-purpose circuits. The 6 kA breaking capacity meets typical requirements for small installations and helps limit damage during short‑circuit events. DIN‑rail compatibility and conventional terminal connections simplify installation and integration into existing distribution boards.

Suitable for

• Protection of three‑phase feeder circuits in residential distribution boards
• Light commercial applications with moderate fault current levels
• Circuits supplying motors, lighting, socket outlets and general equipment with inrush currents

When it may not be suitable

This breaker may not be appropriate where prospective short‑circuit currents exceed the 6 kA breaking capacity; in such cases a higher breaking capacity device is required. It is also not intended for use as a main incoming energy limiter in large commercial or industrial installations where higher continuous currents or selective coordination are necessary.

Key specifications

• Poles: 3‑pole (three‑phase protection)
• Rated current: 63 A continuous
• Tripping characteristic: C‑type (thermal‑magnetic)
• Rated breaking capacity: 6 kA
• Mounting: DIN‑rail compatible
• Terminal type: standard screw/clamp terminals for distribution boards

How to use

Install the breaker on a compatible DIN‑rail inside the distribution board following local electrical codes. Connect the three phase conductors to the line terminals and the load conductors to the load terminals, ensuring secure tightening to the manufacturer’s recommended torque. Use appropriate cable sizes and protective earthing as required by the circuit design. Test the installation by switching the breaker on and off and verify downstream protection and coordination with other protective devices.

What to consider before purchase

• Verify the maximum prospective short‑circuit current at the installation location and ensure it does not exceed 6 kA
• Confirm that a C‑characteristic trip curve suits the connected loads (motor inrush, lighting, general loads)
• Ensure panel space and DIN‑rail compatibility for a three‑pole device
• Choose appropriate conductor cross‑sections and torque settings for 63 A applications

Usage recommendations

For proper coordination, pair this three‑pole 63 A C‑characteristic breaker with upstream and downstream protective devices selected based on fault current levels and discrimination requirements; follow local wiring regulations and periodic inspection schedules to maintain reliable protection.