6kA MCB's 6-63A 1 Pole B/C Curve
Our single pole 6kA Miniature Circuit Breakers (MCBs) provide reliable overcurrent and short-circuit protection for domestic and light commercial circuits. Available in 6A to 63A ratings with B or C curve characteristics, these breakers are DIN rail mounted and fully compliant with BS EN 60898. Suitable for use in Whitecliffe...
Our single pole 6kA Miniature Circuit Breakers (MCBs) provide reliable overcurrent and short-circuit protection for domestic and light commercial circuits. Available in 6A to 63A ratings with B or C curve characteristics, these breakers are DIN rail mounted and fully compliant with BS EN 60898.
Suitable for use in Whitecliffe consumer units and most standard distribution boards, these MCBs are designed for quick installation, long service life, and consistent tripping performance.
Available variants:
- 6A, 10A, 16A, 20A, 32A, 40A, 50A, 63A – B curve
- 6A, 10A, 16A, 20A, 32A, 40A, 50A, 63A – C curve
Curve type guide: B curve – trips at 3–5× rated current, suitable for domestic lighting and socket circuits. C curve – trips at 5–10× rated current, suitable for circuits with higher inrush currents such as motors, pumps, and some EV chargers. D curve (special order) – trips at 10–20× rated current, used for industrial loads with very high inrush (not standard stock).
- Breaking capacity: 6kA at 230/400V
- Electrical life: 8,000 operations
- Mechanical life: 20,000 operations
- Safety: IP20 contact position indicator
- Dimensions: 18mm width per module
What does 6kA mean on an MCB?
6kA is the rated breaking capacity – the maximum fault current the MCB can safely interrupt without damage.
When should I use a C curve MCB instead of B curve?
C curve breakers are used on circuits with higher inrush currents such as motors, pumps, or EV chargers. B curve is suitable for general domestic lighting and socket circuits.
Are these MCBs compatible with Whitecliffe boards?
Yes – they are designed for Whitecliffe consumer units and fit standard 18mm DIN rail enclosures.
Do you stock D curve MCBs?
Type D MCBs (10–20× trip current) are available on request for industrial applications with very high inrush currents.
- Type: Single pole MCB
- Rated current (In): 6A – 63A
- Curves: B or C (D available on request)
- Rated voltage (Ue): 230/400V AC
- Rated frequency: 50/60Hz
- Breaking capacity (Icn): 6kA
- Insulation voltage (Ui): 500V
- Impulse withstand voltage (Uimp): 4kV
- Dielectric test voltage: 2kV for 1 minute
- Thermal element reference temperature: 30°C
- Operating temperature: -5°C to +40°C (daily average <35°C)
- Storage temperature: -25°C to +70°C
- Standards: BS EN 60898, BS7671:2018 (Amendment 2)
MCBs must be installed in a suitable distribution board by a qualified electrician. Always match the rating and curve type to the circuit design.
- Ensure secure DIN rail mounting
- Fit only into enclosures with correct busbar compatibility
- Select B curve for standard domestic circuits
- Select C curve for circuits with higher inrush currents
- For industrial or Type D applications, confirm with design calculations
