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6 way extension lead with surge protection explained

Updated: 22 October 2026

You are about to plug a television, a console or a PC into a 6 way extension lead that says surge protection. That claim is about short spikes. It is not extra amps, and it is not a battery if the power cuts. A joule rating limits some spikes for a while. It does not stop lightning, and it does not let you add a heater beside the computer. Load totals sit on the [how to use a 6 way extension lead](/hub/sockets-and-extension-leads/6-way-extension-lead/sub/6-way-extension-lead-how-to-use) page, and prices are in the [6 way extension lead comparison](/hub/sockets-and-extension-leads/6-way-extension-lead).

You are about to plug a television, a console or a PC into a 6 way extension lead that says surge protection. That claim is about short spikes. It is not extra amps, and it is not a battery if the power cuts.

Our top picks

Masterplug Masterplug SRG6210N

Best overall

Masterplug Masterplug SRG6210N
8.5/10about £10.82
View offer
Masterplug Masterplug SWSRG6210N

Rank 2

Masterplug Masterplug SWSRG6210N
9.0/10about £12.49
View offer
Dewenwils Dewenwils 6-way

Alternative

Dewenwils Dewenwils 6-way
8.6/10about £16.99
View offer
On this page
  1. 1.What a surge lead is for
  2. 2.The joule claims in this set
  3. 3.The indicator and the warranty
  4. 4.When a UPS is the other product

What a surge lead is for

A plug-in surge lead is there to absorb some switching spikes before they reach a television or a computer power supply. The parts are often metal-oxide varistors, and they wear out. A useful lead shows they are still in circuit, because the sockets can stay live after the surge parts have failed. A neon that only means power on is a different lamp. A 6 way extension lead with surge protection in this set is still 13 A. An RCD does not clamp a spike. None of these indoor bars belongs in a bathroom or a garden. A bar under the television is not an SPD at the consumer unit under BS 7671.

The joule claims in this set

The Masterplug SRG6210N and the switched SWSRG6210N state 370 joules, with surge and power LEDs, 2 m and connected-equipment wording up to £1,000 within three years. The switched model is £12.49. The unswitched model is £10.82. The best 6 way extension lead page uses the switched bar as the top pick when you want the joules and the switches. The Dewenwils bullets say 270 joules on a 3 m lead at £16.99, while a specification cell says 13 amps, which is not joules. The Pro Elec claims surge protection and does not state joules. The basic Masterplug lists 1 joule, and reviews say there is none.
Masterplug Masterplug SRG6210N

Testsieger

Masterplug Masterplug SRG6210N
8.5/10about £10.82
View offer

The indicator and the warranty

On the Masterplug surge bars the bullets name a power LED and a surge LED. If the surge lamp is out and the power lamp is on, treat the bar as an ordinary extension until you have checked the instructions. A strip can keep supplying power after the surge parts have died. The Pro Elec neon is described as an indicator, not as a surge-health lamp. The Status neon only shows that a non-surge lead is live. Masterplug's warranty is up to £1,000 for three years on the SRG page. The text says the lead is not a lightning arrestor, and that it must not be daisy-chained. The Dewenwils listing does not copy that sentence.

When a UPS is the other product

A surge lead does not keep a PC running when the lights go out. A UPS does, for as long as its battery lasts. Schneider Electric's UK guidance says not to plug a UPS into a surge strip, and not to plug a surge strip into a UPS output. For a lamp and a radio, the plain Status bar at £6.97 has no joule claim to misunderstand.

Common questions

Do I need surge protection for a television?
It is worth it when the set matters enough that a few pounds for a stated joule rating and an indicator feels sensible. Here that is the Masterplug bars at 370 J, or the Dewenwils if you need 3 m and you use the 270 J bullet. It is not a legal requirement in an existing living room, and it is not an SPD in the consumer unit. A lamp and a radio do not need it.
Is 370 joules enough?
It is the figure Masterplug states on the SRG and SWSRG leads, with a surge LED and wording up to £1,000. No source here sets a UK minimum of 370 J or 600 J. The number is a claim about spike energy, and Masterplug says the lead is not a lightning arrestor. If the listing states no joules, you cannot compare it with 370.
Does the neon mean the surge parts still work?
Only if the listing says the lamp is a surge indicator. The Masterplug surge bars name a power LED and a surge LED. A neon on the Status lead, which does not claim surge protection, shows that the bar is powered. The Pro Elec neon is an indicator, not proof that unnamed surge parts are intact.
Is a surge lead a UPS?
No. A surge lead has no battery. When the power fails, the television goes off. A UPS bridges a short cut so you can save work. Schneider Electric UK says not to feed a UPS from a surge strip or to hang a surge strip off a UPS. Use one arrangement.
What does the £1,000 warranty actually cover?
On Masterplug's surge warranty the promise is up to the sum on the pack, for three years, and the SRG page states £1,000. It is not a lightning arrestor, and the lead must not be daisy-chained. It covers kit plugged into that lead, on the maker's terms. It is not a test result, and the same sentence is not on every surge-worded listing here.
Which leads in this set do not have surge protection?
The Status S6W2MS12, the Toomke, the Desiretech and the switched SE UKASE bar do not claim it in the bullets. The basic Masterplug lists 1 J and reviews say there is none, so that cell is not a real claim. The tower claims surge protection without joules. The two Masterplug surge bars and the Dewenwils bullets are the ones with a number.

Related pages

6 way extension lead buying guide

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Best 6 way extension lead for desk, budget or reach

How to use a 6 way extension lead without overloading

6 way extension lead with USB for phones, not laptops

Sources

Sources taken from the research digest. Listings were scored on 19 October 2026. This page did not run a lab test.

  1. Plugs and Sockets etc. (Safety) Regulations 1994 (retrieved 19.10.2026)
  2. Electrical Safety First — extension leads (retrieved 19.10.2026)
  3. Electrical Safety First — plugs and fuses (retrieved 19.10.2026)
  4. BEAMA — extension lead safety check-list (retrieved 19.10.2026)
  5. OPSS — ETSC 6 way USB lead (retrieved 19.10.2026)
  6. Kent Fire and Rescue Service — electricity safety (retrieved 19.10.2026)
  7. London Fire Brigade — cables, fuses and leads (retrieved 19.10.2026)
  8. Masterplug — surge warranty (retrieved 19.10.2026)