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12v fuse box vs consumer unit

Updated: October 2026

A 12v fuse box vs consumer unit search usually means you have both phrases in one job: a camper with a leisure battery, a boat, or a shed that might also have mains sockets. The two boxes protect different voltages, and buying one does not cover the other. Use a blade fuse box for 12 V to 32 V DC. Use a consumer unit for 230 V. A camper with hook-up can need both, in separate enclosures. This page is that conditional choice. Named picks and star counts stay on the [fuse box comparison](/hub/electrical-equipment/fuse-box). Prices are amazon.co.uk figures from 20 October 2026. This is not a van wiring design and not a lab test.

A 12v fuse box vs consumer unit search usually means you have both phrases in one job: a camper with a leisure battery, a boat, or a shed that might also have mains sockets.

Our top picks

Tawveml Tawveml 6-way 12 V fuse box

Best overall

Tawveml Tawveml 6-way 12 V fuse box
8.5/10about £11.39
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KAOLALI KAOLALI 12-way 12 V fuse box

Best value

KAOLALI KAOLALI 12-way 12 V fuse box
7.9/10about £14.57
View offer
Lifegogo Lifegogo 2-way IP65 consumer unit

Rank 3

Lifegogo Lifegogo 2-way IP65 consumer unit
6.3/10about £14.99
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On this page
  1. 1.Same words, different voltage
  2. 2.Battery circuits only
  3. 3.Mains circuits only
  4. 4.A camper that has both

Same words, different voltage

Both products are sold as a fuse box, which is why the results mix. A blade box in this set is an ATC or ATO holder. ISO 8820-3 is the standard for those fuse-links, typically at 32 V. A consumer unit here is a small mains board with a 30 mA RCD, described for a garage, caravan or workshop. The IET's rules for that RCD describe 230 V installations. They do not describe a blade block on a leisure battery. A lower price on a blade block is not a cheaper way to protect a 230 V socket. If you have not fixed the voltage yet, the fuse box buying guide is the longer order of decisions. Named picks stay on the best fuse box page.

Battery circuits only

Buy only a blade box when the loads are 12 V or 24 V and there is no 230 V hook-up to protect. Most of these blocks state 30 A per circuit and 100 A for the whole panel, from 12 V to 32 V DC. That 30 A figure limits the fuse position. It does not size the cable, and an inverter feed from the battery does not belong there. Fuse that cable at the battery. ENDARK and KAOLALI reviews report voltage still on the terminal with the fuse removed. A lit LED is not isolation. If your only supply is the battery, choose a blade box and meter an empty position. Do not add a consumer unit to be safer. It has nothing to connect to.
Tawveml Tawveml 6-way 12 V fuse box

Testsieger

Tawveml Tawveml 6-way 12 V fuse box
8.5/10about £11.39
View offer

Mains circuits only

Buy only a consumer unit when the circuits are 230 V and there is no leisure-battery board to build. A shed fed from the house is the usual case: a 6 A breaker and a 16 A breaker under a 40 A 30 mA RCD, which is the pattern on PATNFR, Lifegogo and the JIODEKEYI title. None of the four states BS EN 61439-3. A blade box cannot stand in for that board. Connecting ATC fuses to garage sockets puts a vehicle fuse-link on mains, which ISO 8820-3 does not cover. Regulation 421.1.201 calls for a non-combustible enclosure inside a dwelling. In England a new circuit is notifiable under Approved Document P. That paperwork is for the 230 V work, not for a 12 V block.

A camper that has both

A camper or boat with shore power can need both boxes, and they stay in separate enclosures. The blade block feeds the 12 V lights, pump and fridge from the leisure battery. The consumer unit feeds the 230 V hook-up sockets. You do not pass battery current through the RCD, and you do not land hook-up live and neutral on blade terminals. If a meter shows volts with the fuse out, stop. That fault is reported on ENDARK and on KAOLALI. Part P does not travel unchanged into a vehicle. A blade box on a leisure battery is not that notice. One voltage means one box. Both voltages mean both boxes.

Common questions

When do you buy only a blade box?
When every load is 12 V to 32 V DC: van lights, a pump, a fridge on the leisure battery, a small solar split. You do not add a consumer unit if there is no 230 V to protect. Do not put an inverter's main battery cable on a 30 A blade position. Fuse that feed at the battery.
When do you buy only a consumer unit?
When the job is 230 V lights and sockets in a garage, shed or hook-up, and there is no 12 V board to build. A 6 A and 16 A pair under a 30 mA RCD matches the small-shed sketch. A blade box cannot feed those sockets. In England the new circuit is notifiable.
When does a camper need both?
When it has a leisure battery and 230 V shore power, or an inverter output that needs its own AC protection. The blade box covers the DC circuits. The consumer unit covers the mains. They sit in separate enclosures. The RCD does not protect the 12 V fridge.
Can the garage IP65 unit fuse a leisure battery?
No. Those four units are 230 V boards with a 30 mA RCD and MCBs. A leisure battery is 12 V DC. The RCD is the wrong device. Use a blade fuse box for the battery circuits. The IP65 claim does not retask the board.
Can a 12-way blade box protect 230 V hook-up sockets?
No. A 12-way block such as the ENDARK is still a 12 V to 32 V ATC/ATO holder, even at £21.99 and 2,310 reviews. Hook-up sockets need a consumer unit. More ways do not raise the voltage.
What does 30 A per circuit actually limit?
It is the holder's stated ceiling on that fuse position, not the size of your cable and not the whole van. The panel figure, often 100 A, is separate. A 30 A fuse does not make a thin wire safe. High-current DC feeds belong on their own fuse at the battery.

Related pages

Garage consumer unit

How to test a fuse box

Fuse box

Best fuse box: one pick inside each voltage family

Fuse box buying guide: voltage, then ways and trip

Sources

Public UK sources are listed below. Shelf prices and star lines are the amazon.co.uk figures checked on 20 October 2026.

  1. Approved Document P (2013, England) (retrieved 20 October 2026)
  2. IET: consumer units and protective devices FAQs (retrieved 20 October 2026)
  3. Electrical Safety First: wiring regulations help (retrieved 20 October 2026)
  4. Electrical Safety First: How safe is your home (2025) (retrieved 20 October 2026)
  5. IET: supply to a detached outbuilding (retrieved 20 October 2026)
  6. IET: external consumer units (retrieved 20 October 2026)
  7. ISO 8820-3:2026, blade fuse-links for road vehicles (retrieved 20 October 2026)
  8. 12 Volt Planet: Blue Sea 5026 12-circuit fuse block (retrieved 20 October 2026)