I have this Siemens electrical panel and I am looking for a way to install a lock on the panel door so that it can only be opened with a key. Any suggestions? Are there latches that already have built in locks?

(click to enlarge pictures)

  • 1
    Even if the door is locked, the entire front cover can be removed with two screws. You’ll need some kind of bar that goes across the whole thing that has mounting concealed. That said, should be migrated to diy.stackexchange
    – hacktastical
    May 23 '21 at 22:47
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    How about ordering the door lock kit mentioned in the panel accessory list?
    – Justme
    May 23 '21 at 23:11
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    To clarify what @Justme said, on the photo you posted, it lists the following product as a lock. Looks like it can be had on Amazon/eBay for $25-30 USD. mall.industry.siemens.com/mall/en/us/Catalog/Product/… May 24 '21 at 1:16
  • @DanIsFiddlingByFirelight oops, thanks for catching that. I've submitted another edit ...
    – Glorfindel
    May 24 '21 at 15:16

Your panel already has the knockout for a lock. It is immediately above the latch.

See graphic.

enter image description here

Read the label, it calls out the Siemens part number for a lock kit.

Or you can bring the deadfront to your locksmith and I'm sure they can figure something out.

Remember, it is illegal to deny a tenant access to their circuit breakers. A locksmith may be able to build a lock that operates on a tenant's key.

  • 1
    Aren't these panels generally installed inside the residence they are connected to? In which case, the locks on the doors to that residence should be sufficient security. Adding a lock to the panel would be really annoying to the tenant - even if they have a key it can get lost - I expect most tenants would just leave the key in the lock all the time in order to keep track of it, defeating any possible security advantage. May 24 '21 at 13:48
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    Is there a deleted comment somewhere stating that this panel is in a rental? My first thought was a concern that a kid might decide it was fun to turn off all the lights at once. May 24 '21 at 14:57
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    I never stated that this was a rental,even though it is a rental. This panel is for the common area electric and the tenants should not have access to it
    – iambdot
    May 24 '21 at 15:21
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    experience gave me a hunch... never hurts to mention it, since StackExchange's whole model is other people with this question finding this on Google. May 24 '21 at 18:40

The door appears to have a breakout formed above the latch. Check with a local Siemens distributor.


I believe I've seen breaker panels with locking latches in schools and some commercial buildings.

You could always add a small padlock hasp on a panel that has no provision for a lock.

  • As noted in another answer, this panel does have provision for a lock, and even specifies the exact part number to order. This is, however, reasonable advice for others who may not have a panel door designed to take a lock.
    – FreeMan
    May 24 '21 at 11:08

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