50A 4 Pole 10kA MCB B Curve – WKC450B

The WKC450B is a 50A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral systems. With a B Curve trip characteristic, it is intended for resistive load applications such as socket outlet groups, small power distribution boards, and general lighting circuits in commercial three-phase systems, EV distribution boards, and solar PV installs.

Providing a 10kA breaking capacity, the WKC450B offers reliable protection against overload and short-circuits while ensuring complete neutral disconnection. It is bi-directional, DIN-rail mounted, and manufactured to BS 7671 (18th Edition) standards.

Key Features

• 50A 4 Pole MCB – B Curve characteristic
• 10kA breaking capacity – safe for commercial & industrial systems
• Full neutral isolation: 4P switching (L1, L2, L3, N)
• Bi-directional feed: top or bottom cable entry
• DIN-rail mounted: 18mm per module
• Complies with BS 7671 (18th Edition)

Compare WKC 4 Pole 10kA MCBs (B Curve)

• Model: WKC450B
• Type: Miniature Circuit Breaker (MCB)
• Current Rating: 50A
• Curve: B Curve
• Poles: 4P (L1, L2, L3 + Neutral)
• Breaking Capacity: 10kA
• Mounting: 35mm DIN rail, 18mm width per pole
• Dimensions: Approx. 72mm (W) x 90mm (H) x 77mm (D)
• Compliance: BS 7671 (18th Edition), IEC/EN 60898-1
• Brand: WCED

The WKC450B must be installed by a qualified electrician in accordance with BS 7671 wiring regulations.

• Mount on 35mm DIN rail (18mm per pole)
• Check that system fault current ≤10kA
• Use only for resistive load applications (B Curve)
• Apply correct tightening torque on terminals
• Ensure adequate enclosure space for 4P switching

What applications suit a 50A B Curve breaker?

It is typically used for high-demand resistive load circuits such as large socket groups or small commercial distribution panels.

Why use a 4-pole breaker here?

A 4-pole breaker disconnects the neutral as well as all three phases, giving full protection for three-phase + N circuits.

Is the WKC450B suitable for EV or solar installs?

Yes — provided the load is resistive and the board fault level does not exceed 10kA. For inductive or inrush loads, select a C or D Curve variant.

Does it comply with UK standards?

Yes, it is manufactured to BS 7671 (18th Edition) and IEC/EN 60898-1 standards.