Fusebox MT06B401 40A Single Pole B-Curve 6kA MCB (Miniature Circuit Breaker)

This is the Fusebox MT06B401 40A Single Pole B-Curve 6kA Miniature Circuit Breaker – Reliable Overcurrent Protection available at SparksDirect.co.uk for the best price.

The Fusebox MT06B401 is a Single Pole Miniature Circuit Breaker (MCB) designed to guard electrical circuits against overloads and short-circuit faults in domestic, commercial, and light industrial distribution boards. MCBs like this replace old-style fuses by providing resettable protection — once a fault is cleared, the breaker can be switched back on instead of replacing a blown fuse.

This model uses a Type B tripping characteristic, which is tailored to trip at roughly 3–5× the rated current, making it suitable for general circuits where moderate inrush currents occur — for example lighting circuits, socket circuits, and standard appliances.

As part of the Fusebox MT06 range, the MT06B401 fits on a standard 35mm DIN rail and complies with commonly accepted safety standards (IEC/EN 60898-1 and UK wiring regulations). Its robust construction and reliable performance make it a go-to choice for electricians when building or extending consumer units.

In modern electrical installations, such breakers are essential for protecting wiring from overheating and preventing electrical fires by disconnecting the circuit when dangerous current levels are detected.

Features and Benefits

• 40A current rating — protects mid-range circuits such as power outlets and dedicated appliances.
• Type B tripping curve — responsive to overloads and low inrush currents typical in residential circuits.
• 6kA breaking capacity — safely interrupts fault currents up to 6 000A.
• Thermal-magnetic trip unit — combined protection against sustained overloads and sudden short circuits.
• DIN-rail mounting — easy installation into standard consumer units and distribution boards.
• Compact single-module width — saves space inside electrical panels.
• IP20 protection rating — basic finger-safe enclosure for enhanced safety.
• Resettable protection — automatically trips under fault and can be reset without replacing components.

Technical Specifications

• Product Code: MT06B401
• Device Type: Miniature Circuit Breaker (MCB)
• Rated Current: 40A
• Tripping Curve: Type B (3–5× In)
• Rated Voltage: 230V AC
• Frequency: 50/60 Hz
• Number of Poles: 1P (single pole)
• Rated Breaking Capacity: 6000A (6kA)
• Mounting: 35mm DIN rail
• Terminal Capacity: Up to 16mm²
• Recommended Tightening Torque: 2.5 Nm
• Protection Rating: IP20 (finger-safe)
• Material: PA6 (Nylon 6) housing
• Mechanical Endurance: 10 000 operations
• Standards: IEC/EN 60898-1 compliant
• Dimensions: 83mm (height) x 17.6mm (width) x 69.6mm (depth)
• Weight: 0.12kg

Three Reasons Customers Recommend This

1. Reliable protection for essential circuits — trusted to guard domestic and light commercial circuits from overcurrents.
2. Easy to install and reset — DIN-rail fitting and simple reset mean maintenance and fault recovery are quick.
3. Compact and cost-effective — offers good value while meeting safety standards.

Who Needs It

• Electricians and installers specifying circuit protection in consumer units and distribution boards.
• Maintenance professionals replacing or upgrading MCBs in existing installations.
• Homeowners or building owners who want compliant protective devices in modern electrical systems (fitted by a professional).

Who Can Install It

• Qualified electricians or competent persons familiar with consumer unit wiring and local electrical regulations.
• Experienced DIYers with proper safety knowledge and power isolated might fit this (though internal board work is best left to professionals).

Note: Some images and pictures are for reference only. The item may differ from the image/picture due to manufacturer's change. Should you require the exact item in the picture, please call or email us to enquire.