Fusebox MT06B321 32A Single Pole B-Curve 6kA MCB (Miniature Circuit Breaker)

Introducing the Fusebox MT06B321 32A Single Pole B-Curve 6kA Miniature Circuit Breaker – Reliable DIN-Rail Protection available at SparksDirect.co.uk for the best price.

The Fusebox MT06B321 is a Single Pole miniature circuit breaker (MCB) designed to protect electrical circuits from overloads and short-circuit faults in consumer units and distribution boards. It is part of the popular Fusebox MT06 B-Curve range, which offers dependable over-current protection for residential and light commercial installations.

MCBs like the MT06B321 are critical safety devices: they automatically disconnect the circuit when the current exceeds a safe level, preventing cable overheating, potential fire hazards, or damage to electrical equipment. Unlike traditional fuses, these breakers can be reset simply by switching them back on once a fault has been addressed.

Specifically, this model uses a Type B tripping characteristic, meaning it trips quickly on relatively low levels of overload — ideal for standard lighting, socket circuits, and other typical household loads with minimal inrush current.

Built for easy fitment onto a standard 35mm DIN rail, the MT06B321 is compact, cost-effective, and designed to meet recognised safety standards such as IEC/EN 60898-1 and UK wiring regulations.

Features and Benefits

• Rated current 32A – suitable for medium-duty circuits (e.g., rings, showers, smaller appliances).
• Type B tripping curve – trips at 3–5× rated current, appropriate for residential circuits.
• 6kA breaking capacity – safely interrupts high fault currents.
• Thermal-magnetic mechanism – combines overload and short-circuit protection in one device.
• DIN-rail mountable (35mm) – installs easily into standard consumer units and boards.
• Compact single-module width – saves space in distribution panels.
• IP20 finger-safe – basic protection against contact with live parts.
• Meets safety standards – compliant with IEC/EN 60898-1 and UK wiring regs.

Technical Specifications

• Brand / Series: Fusebox MT06B321
• Product Type: Miniature Circuit Breaker (MCB)
• Rated Current: 32A
• Number of Poles: Single Pole (1P)
• Rated Voltage: 230V AC
• Frequency: 50/60 Hz
• Tripping Curve: B (Type B) – 3–5× In
• Rated Breaking Capacity: 6kA
• Tripping Type: Thermal-magnetic
• Terminal Capacity: Up to 16mm²
• Recommended Tightening Torque: 2.5 Nm
• Mounting: 35mm DIN rail
• Protection Rating: IP20 (finger-safe)
• Material: PA6 (Nylon 6) housing
• Mechanical Endurance: 10 000 operations
• Standards Compliance: IEC/EN 60898-1 and 18th Edition wiring regs compliant
• Dimensions: 83mm (height) x 17.6mm (width) x 69.6mm (depth)
• Weight: 0.09–0.12kg

Three Reasons Customers Recommend This

• Reliable circuit protection – trusted to safeguard against overloads and short circuits in everyday installations.
• Easy to install and reset – simple DIN-rail fitment and reset functionality improve convenience versus fuse replacements.
• Cost-effective safety – excellent value choice for standard consumer unit protection.

Who Needs It

• Electricians and electrical contractors specifying protective devices for residential and light commercial boards.
• Maintenance and facilities teams replacing or upgrading circuit protection modules.
• Homeowners with basic electrical understanding wanting compliant MCBs (to be installed by a qualified person).

Who Can Install It

• Qualified electricians and competent persons familiar with consumer units, wiring regs, and safe installation practices.
• Not recommended for inexperienced DIYers: internal panel work should always be done with power isolated and preferably by a qualified electrician.

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.