Double Pole MCB 20A Kenya

Description

Double Pole MCB 20A — SCB8-63 2P 400VAC AC Circuit Breaker

The Double Pole MCB 20A (model SCB8-63) is a compact AC miniature circuit breaker built to protect Kenyan homes, solar installations, and commercial wiring against overload and short-circuit faults. With a 2-pole configuration, this MCB simultaneously breaks both the live and neutral conductors, giving you full circuit isolation in a single, easy-to-reset switch.

Rated at 20 amps and 400VAC, the SCB8-63 double pole MCB is engineered for the most common branch-circuit loads in Kenyan installations — sockets, lighting circuits, AC output from solar inverters, water pumps, freezers, and small motor loads. It mounts on a standard 35mm DIN rail, so it drops directly into any distribution board, consumer unit, or solar combiner box without modification.

Where this MCB fits in your system

• Solar AC side: Protect the AC output of a hybrid or grid-tie inverter feeding your home consumer unit.
• Distribution boards: Use as a sub-main breaker for a kitchen circuit, a workshop, or a separate outbuilding.
• Borehole and water pumps: Two-pole isolation is recommended for any single-phase motor load up to 20A.
• Commercial panels: Branch protection for office sockets, refrigeration, POS terminals, and lighting rings.
• Backup systems: Isolate the line between your inverter and the changeover switch tied to the national grid.

Why a 2-pole MCB instead of single pole?

A single pole MCB only breaks the live conductor. If a fault develops on the neutral side, the circuit can stay partly energised even after the breaker trips. A double pole MCB cuts both conductors at once, which is the safer choice for solar AC outputs, large appliances, outbuildings, and anywhere you need to fully isolate a sub-circuit before servicing.

Technical Specifications

Key Features

• True double-pole disconnection — both live and neutral break simultaneously for complete isolation.
• C-curve trip characteristic — handles inrush from motors, transformers, and inverter capacitors without nuisance tripping.
• Thermal-magnetic mechanism — slow thermal trip for overloads, instant magnetic trip for short circuits.
• 6 kA breaking capacity — sufficient for almost every residential and light-commercial installation in Kenya.
• Clip-on DIN rail mount — installs and removes without tools in seconds.
• Visible status window — green/red indicator confirms ON, OFF, or tripped state at a glance.
• Wide cable tolerance — terminals accept solid or stranded copper up to 25mm².
• Heat- and flame-retardant housing — built to handle long hours under fault current without deformation.

Typical Applications in Kenya

• Solar inverter AC output protection (hybrid and grid-tie systems)
• Backup changeover switches between solar and the national grid
• Domestic ring circuits for sockets and lighting
• Borehole and surface-pump single-phase motor protection
• Workshop tools and welding-bench sub-circuits
• Office and retail sub-main protection
• Outbuilding, garage, and SHED feeder circuits
• Solar combiner box AC bus protection

Installation Notes

This double pole MCB should always be installed by a qualified electrician. Each pole must be wired with the same gauge of cable, the supply (line) terminals are at the top, and the load terminals are at the bottom. Tighten terminal screws to the manufacturer’s torque specification to avoid loose-contact heating, which is one of the most common causes of MCB failure in Kenyan installations. For solar AC-side protection, the breaker should be located inside the inverter’s dedicated AC isolator enclosure or in the main consumer unit, never exposed to direct sunlight or rain.