Molded Case Circuit Breaker Hager MC350A — 3P 50A Type C, 6 kA Breaking Capacity

The Hager MC350A is a molded case circuit breaker in a three-pole configuration rated for 50 A with a Type C tripping curve and 6 kA short-circuit breaking capacity. It is intended for protection of low-voltage electrical installations where combined thermal and magnetic protection is required. The device is suitable for installation in distribution boards and for protection of feeders, lighting circuits and small motors in residential and light commercial environments.

Advantages

The breaker combines thermal protection for overloads with a magnetic trip element for short-circuit protection, providing dependable interruption of fault currents up to 6 kA. As a three-pole unit, it ensures simultaneous disconnection of all phases for balanced safety. The Type C tripping characteristic gives a defined inrush tolerance suitable for circuits with moderate motor starting currents or transformer inrush.

Suitable for

• Protection of three-phase distribution circuits in homes and small businesses
• Feeder protection for lighting, sockets and HVAC units with moderate inrush
• Short-circuit and overload protection for small motors and pumps

When it may not be suitable

This breaker may not be appropriate where extremely high short-circuit levels exceed 6 kA or where selective coordination with upstream devices requires different breaking capacities. It may also be unsuitable in installations that demand a different tripping characteristic (for example Type B for very sensitive circuits or Type D for high inrush applications) or where earth leakage protection is required as an integrated solution.

Key specifications

• Poles: 3-pole (three-phase)
• Rated current: 50 A
• Tripping characteristic: Type C (thermal-magnetic)
• Short-circuit breaking capacity: 6 kA
• Function: Overload and short-circuit protection for low-voltage circuits

How to use

Install the breaker into the appropriate DIN-rail or panel cutout according to the electrical layout and local wiring regulations. Ensure correct tightening of line and load conductors and observe phase sequence when connecting three-phase supplies. Set and coordinate upstream protection devices as required for discrimination and system safety. Test the installation after wiring and before commissioning by applying operational and trip tests in accordance with local standards.

What to consider before purchase

• Verify that 50 A rated current matches the expected continuous load of the circuit.
• Confirm that a Type C trip curve is appropriate for any motor or transformer inrush present.
• Check that a 6 kA breaking capacity is sufficient for the installation's prospective fault level.
• Determine whether additional protective devices (RCDs, surge protection) are required for compliance.

Usage recommendations

Select the breaker as part of a coordinated protection scheme: match upstream and downstream devices to avoid nuisance trips while ensuring safety. Regularly inspect connections for tightness and signs of overheating, and include the breaker in periodic electrical maintenance and testing schedules.