Replace a Jung light switch only when it is the same function
Updated: October 2026
You are swapping a failed Jung mechanism for the same function, not designing a new lighting circuit. The rocker on the wall is the part that has failed. Turning that rocker off does not prove the cables are dead. If you cannot yet say whether the old switch is one-way, two-way or intermediate, stop and use [intermediate switch or two way](/hub/electrical-equipment/jung-switch/sub/jung-switch-intermediate-or-two-way) before you buy. The article numbers in this comparison are on the [Jung switch comparison](/hub/electrical-equipment/jung-switch). This page is the stop-and-swap boundary. It is not a wiring diagram. Figures are the listings noted on 21 October 2026.
You are swapping a failed Jung mechanism for the same function, not designing a new lighting circuit. The rocker on the wall is the part that has failed. Turning that rocker off does not prove the cables are dead.
You are swapping a failed Jung mechanism for the same function, not designing a new lighting circuit. The rocker on the wall is the part that has failed. Turning that rocker off does not prove the cables are dead. If you cannot yet say whether the old switch is one-way, two-way or intermediate, stop and use intermediate switch or two way before you buy. The article numbers in this comparison are on the Jung switch comparison. This page is the stop-and-swap boundary. It is not a wiring diagram. Figures are the listings noted on 21 October 2026.
Our top picks
| Badge | Product | Function | Mounting | Terminal | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Jung Jung 507 U | Intermediate | Flush insert | Not stated | 9.6 | about £14.97 | View offer |
| Best value |  Jung Jung 606 W | One-pole two-way | Surface unit | Screw on the listing | 9.6 | about £12.60 | View offer |
 Jung Jung 509 U | Two-gang two-way | Flush insert | Screw | 9.2 | about £22.75 | View offer |
On this page
Only replace the same function
Like-for-like means the new part does the same job as the one you take off: the same positions on that one light, and the same mounting. A 507 U intermediate insert does not stand in for a 509 U double-change insert, and neither flush insert stands in for a 606 W surface housing. Any Jung rocker is not close enough. The article number is the match. Before you lift a conductor, photograph the article number and the terminals with the conductors still in place. This page does not assign COM, L1 or L2, because those letters are not a recipe in the listings. If the photograph shows more cables than you expected, or two circuits sharing one box, stop. If you have not chosen the article, use the Jung switch buying guide.
What England treats as not notifiable
In England, Approved Document P says notifiable work is a new circuit, a consumer-unit replacement, or an addition or alteration in a special location. That special location is the space around a bath or shower, or a room containing a swimming pool or a sauna. Other work, including replacements, repairs and maintenance, is not notifiable. GOV.UK says most like-for-like replacements do not have to be told to a building-control body, except a fuse-box replacement and extra points around baths and showers. A hallway swap can sit in that group. Notifiable is not the same word as safe. Scotland and Northern Ireland publish their own rules. Do not paste England's list onto a flat in Glasgow or Belfast.
Isolate at the consumer unit and prove dead
The isolator is at the consumer unit, not the rocker you are about to remove. HSE's HSG85 and Electrical Safety First's Best Practice Guide 2 describe the same sequence in outline: identify the isolation point, secure it off, post a notice, prove the voltage indicator, prove the conductors dead, then prove the indicator again. Guide 2 advises a test lamp or a two-pole voltage detector. It does not accept a multimeter or a non-contact stick. If you cannot lock the breaker off, or you cannot prove the tester before and after, stop. None of these listings is an isolator. A review that says the cables clip in is not a permission to work live.
Insert, frame, rocker — or a complete surface unit
Swtch's Jung notes show the flush order as insert, then frame, then rocker. A square UK box is not a promise that every British back box accepts a Jung insert without an adapter. On Jung's UK pages the 507 U and the 606 W are screwless for rigid wire up to 2.5 mm², and the 509 U is screw terminals. The amazon.co.uk screw row on the 606 W conflicts with that page and is not the terminal type used here. The flush listings do not state a cover. One 606 W buyer says the rocker face is not sold separately. If a 507 U arrives with a terminal torn out, do not fit it.
Stop and call a professional
Call a qualified electrician for a new circuit, a consumer-unit change, or anything around a bath or shower. Call one when the box contains mixed circuits, the cable is damaged, or you still cannot name the function. One review says an electrician had to fit a link before a 509 U worked. Another says one side no longer switches. Neither sentence is a home method for adding a bridge. The same stop applies if you cannot prove dead. Part P is the notification boundary, not a terminal map.
Common questions
Does turning this rocker off isolate the circuit?
No. The rocker switches the load. It is not the isolator, and BS EN 60669-1, the switch standard named for this kind of product, does not turn it into one. Isolation is at the consumer unit: locked off, with a notice, and with the conductors proved dead by a test lamp or two-pole detector that you have proved before and after.
Is a like-for-like switch swap notifiable in England?
A replacement, repair or maintenance job is not notifiable under Approved Document P, including in most rooms. The notifiable cases are a new circuit, a consumer-unit replacement, and an addition or alteration in a bath, shower, pool or sauna location. GOV.UK makes the same split and still expects the work to be safe. Scotland and Northern Ireland are not this document.
What still needs an electrician when the swap is not notifiable?
You still need a competent person if you cannot secure the isolation and prove dead, if the cable or the box is damaged, or if the old wiring does not match a simple same-function swap. Notifiable is a building-control word. It does not mean a live conductor is acceptable because the council does not need a form.
What should I photograph before I disconnect anything?
Photograph the article number and the terminals with every conductor still seated. Do it before the first wire comes out, in enough light to read the marks. That photo is your map of this switch, not a diagram borrowed from another brand. If the photo is confusing, that is the moment to stop rather than the moment to guess.
Do I need the same article number, or will any Jung rocker do?
You need the same function and the same mounting. A 507 U, a 509 U and a 606 W are three different parts in this set. Another brand's insert is a further mismatch. The frame and rocker on a flush point may stay if they are the right series and undamaged. The mechanism still has to be the article the circuit uses.
Why might a 509 U need a link that a 507 U does not?
They are different mechanisms. The 509 U is two two-way switches on one insert. One review says an electrician fitted a bridge before it worked, and another says one side died. The 507 U is the intermediate insert, and a review talks about clip-in cables for three switches on one light. Do not copy a link from one article onto the other.
What if the new 507 U arrives with a terminal torn out?
Do not fit it. One buyer reported a cable-release terminal torn out on arrival and did not describe it as shipping damage. A damaged terminal is a return, not a repair on the kitchen table. The same caution applies if a 606 W rocker face is cracked: that face is not sold separately in the review that needed a whole new switch.
Related pages
Sources
Manufacturer pages and public UK sources are listed below. Shelf prices and star lines are the amazon.co.uk figures noted on 21 October 2026. Written reviews in the files are mostly from outside the United Kingdom.
- Jung 507 U, UK catalogue (retrieved 21 October 2026)
- Jung 606 W, UK catalogue (retrieved 21 October 2026)
- Jung 509 U, UK catalogue (retrieved 21 October 2026)
- Jung WG 600 range (retrieved 21 October 2026)
- Approved Document P (2013, England) (retrieved 21 October 2026)
- IET: BS 7671 status (retrieved 21 October 2026)
- BSI: BS EN 60669-1:2018 scope (retrieved 21 October 2026)
- amazon.co.uk listings for these three switches (retrieved 21 October 2026)