IP40 Metal Garage Unit – 100A Main Switch + 6A & 20A MCB (WMMS/620)
£25.50
£50.96
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WMMS/620 is a durable IP40 metal garage consumer unit supplied with a 100A main switch incomer and pre-fitted 6A and 20A B-curve MCBs. Designed for garages, workshops, and small outbuildings, it provides reliable isolation and circuit protection for lighting and heavier socket or radial circuits in full compliance with...
The WMMS/620 is a durable IP40 metal garage consumer unit supplied with a 100A main switch incomer and pre-fitted 6A and 20A B-curve MCBs. Designed for garages, workshops, and small outbuildings, it provides reliable isolation and circuit protection for lighting and heavier socket or radial circuits in full compliance with BS 7671:2018 Amendment 2.
Use the 6A way for lighting and the 20A way for radial sockets or heavier tools. Built in the UK with a steel IP40 enclosure, integrated neutral/earth bars, and earthed drop-down lid for safe, straightforward installation.
Installer Tip: Ideal for radial circuits feeding sockets or heavier garage tools. Verify that cable size, protective coordination, and disconnection times remain within BS 7671 limits for the 20A breaker.
- IP40 all-metal enclosure with earthed drop-down lid
- 100A double-pole main switch for local isolation
- Pre-fitted 6A and 20A B-curve MCBs – suited to lighting and socket circuits
- Integrated neutral and earth bars for fast, neat terminations
- Surface-mount design with compact footprint
- Built to order in the UK – typically dispatched within 3 working days
- Fully compliant with BS EN 61439 and BS 7671 Amendment 2
| Part Code | Incomer | MCB Set | Typical Use |
|---|---|---|---|
| WMMS/616 | 100A Main Switch | 6A + 16A (B) | Lighting + light power/tool circuit |
| WMMS/620 | 100A Main Switch | 6A + 20A (B) | Lighting + heavier socket/radial circuit |
| WMMS/632 | 100A Main Switch | 6A + 32A (B) | Lighting + high-load (e.g. compressor, welder) |
The WMMS/620 delivers balanced protection for lighting and heavier socket circuits in one metal garage consumer unit. For higher current loads or RCD-equipped versions, see our RCD incomer range or consider a Type A RCBO configuration for additional earth leakage protection.
What’s the difference between WMMS/616, WMMS/620 and WMMS/632?
The difference lies in the MCB ratings. WMMS/616 includes 6A + 16A, WMMS/620 includes 6A + 20A, and WMMS/632 includes 6A + 32A. All models share the same IP40 steel enclosure and 100A main switch incomer.
Does this garage unit include RCD or RCBO protection?
No, this model is a Main Switch version. For earth leakage protection, choose an RCD incomer garage unit or use individual RCBOs as required by your design.
Is the WMMS/620 suitable for outdoor installations?
No. The unit is rated IP40 and must be installed indoors (e.g. within a garage or workshop). For outdoor circuits, use our IP65+ weatherproof range.
How quickly can I receive this product?
All WMMS units are built to order and typically dispatched within 3 working days from our UK warehouse.
Can I replace the MCBs with different ratings?
Yes, compatible MCBs can be swapped by a qualified electrician if your load requirements change. Always ensure coordination, cable sizing, and test values remain compliant with BS 7671.
- Part Code: WMMS/620
- Incomer: 100A double-pole main switch (non-RCD)
- Outgoing Ways (fitted): 2
- MCBs Fitted: 6A B-curve + 20A B-curve
- MCB Curve: B curve (for standard lighting and socket circuits)
- Enclosure: Steel, IP40, earthed drop-down cover
- Bars: Integrated neutral and earth bars
- Mounting: Surface mount
- Dimensions: 130 (W) × 258 (H) × 110 (D) mm
- Colour: White powder-coated steel
- Standards: BS EN 61439; installs to BS 7671:2018 (Amendment 2)
- Typical Applications: Lighting + heavier socket/radial circuit for garage or workshop
The WMMS/620 is supplied pre-configured with a 6A and 20A B-curve MCB pair for fast installation. Final connection and testing must always be carried out by a qualified electrician in accordance with BS 7671.
- Allow 3 working days for build and dispatch
- Install in a dry indoor environment only (IP40)
- Confirm sub-main cable and upstream protective device ratings
- Verify that 6A/20A settings align with design current and protective coordination
- Maintain CPC continuity and ensure proper gland/knockout use
- Record outgoing circuit details on your test and inspection documentation
