IP40 Metal Garage Unit – 100A Main Switch + 6A & 20A MCB (WMMS/620)
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...
Read full descriptionThe 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
