I recently bought a condo (2002 construction) and have no experience with electric systems. So please bear with me if I am using incorrect terms.

A few days ago, the plug point where the water kettle was connected stopped working. On the opposite wall of the kitchen, the microwave also stopped working. Both the kettle and microwave were connected to the lower plug points in the outlet. When this happened, I checked the circuit breaker box and only one half of the tandem breakers (circled in red) was in a kind of off position. (I say "kind of off" because the yellow circled breaker is in a "full off" position, but the red ones are not moving at all.)

When half of the red circled breaker tripped, the lower half of outlets stopped working. I switched the appliances to the upper half. (Stupid thing to do in hindsight). Now the top half of the outlets also tripped and both halves of the red circled breaker are stuck in this position. I am not able to reset them. I have removed all appliances from the two outlets it was powering.

1) Can someone please help me understand what is the problem? Like why did half the tandem breaker trip half way.
2) How do I diagnose the problem and what do I need to do to fix this? (I am handy with fixing electronics, but have never done anything with electric appliances)
3) What is this half tripped position called? I am not sure what to look for.

I would've gotten an electrician to look at, but I cannot have anyone come home till the COVID situation is done... my immuno-compromised mom stays with me.

Thank you for your time!

Breaker box - Red circled tripped breaker, yellow circled normal breaker switched off position Breaker Box

One of the two Outlets that tripped Tripped Receptacle

  • 6
    try switching the breaker all the way "off" before you move it back to the "on" position.
    – Z4-tier
    May 8, 2020 at 21:34
  • and make sure none of those appliances is plugged in when you do that. It sounds like something is broken and causing a short circuit.
    – Z4-tier
    May 8, 2020 at 21:35

3 Answers 3


First, unplug anything connected to the tripped circuit. Then, try swinging the breakers all the way to the "off" position before you try moving them back to "on".

Sounds like something that you had plugged in is causing a short circuit. You might be able to test that with a continuity tester or a multimeter, if you have one. Look for an appliance with a closed circuit or very low resistance between the 2 prongs on the plug. If you plug them back in, be prepared for the breaker to trip again and possibly a bit of electrical arcing. Probably not a good idea to test things this way, but some folks might be tempted to try.

Also, if you have any GFCI outlets, make sure that those are not tripped too. These are the kind you usually see in the bathroom with a "TEST" and "RESET" switch. Pushing the "TEST" firmly should make a snapping noise and turn off power to that outlet. Firmly pressing the "RESET" switch will turn the outlet back on.

The outlet in the picture you posted should probably be a GFCI because of how close it is to the sink. It might be connected to a GFCI breaker, or wired with another GFCI on the same circuit that protects both outlets. I'm not sure what the details of the NEC have to say about that, but someone will probably be along that will be able to tell if this is up to code or not.

Regarding the last question (and not trying to be cheeky here... well, not too cheeky...) but I think this condition is just called "tripped" :)

  • 1
    The one right there beside the sink doesn't have to be a GFCI receptacle, but you're right that it does need GFCI protection somewhere along the line. Assuming that this receptacle by the sink actually is GFCI protected, it should have a "protected by GFCI" label on the face as well -- but it does seem rare to actually find those labels installed in residences.
    – Greg Hill
    May 8, 2020 at 22:16
  • Thank you! This helped. I was able to reset the breaker. I think I may have to replace the outlets with GFCI receptacles. The outlets on both sides of the kitchen sink don't seem to be connected to any GFCI outlet. The same in the bathroom also. Time to run to a Home Depot I guess :)
    – insat3D
    May 8, 2020 at 22:17
  • Check the breaker panel too. The breakers themselves can be GFCI's, although i don't see it marked anywhere in the photo.
    – Z4-tier
    May 9, 2020 at 0:26
  • @GregHill: I wonder why the convention is to say "GFCI protected" but not indicate where the protecting GFCI is located?
    – supercat
    May 9, 2020 at 16:57
  • @supercat Good question - I suppose the thrill of the hunt would be spoiled if the location were clearly indicated.
    – Greg Hill
    May 10, 2020 at 18:01

It is tripped

The halfway position is the normal "tripped" position.

For more about what the breakers are generally, here.

To reset it, move it all the way to the "off" position, and then back to the "On" position. Don't make a habit of that. Whatever you're doing to overload the breaker, stop doing that :)

Adapting from Euro power

You have 240V power on that side of the pond. Here, we have 240V, however we center-split it (just like UK does on construction sites) giving us two "sides" of 120V. We use that for small appliances. Unfortunately that includes kitchen appliances.

enter image description here

Now, let's have a word about US and EU appliances, particularly heat appliances. In the EU (checks calendar, after Jan 31, yup) and Britain, appliances just use as much energy as they need for their job. In the US, appliances are limited to 1500 watts, which is not really enough for a lot of jobs by EU standards. However your breakers have an 1800W (120V x 15A) capacity, so it means you can't run 2 of them at once regardless!

So you either tripped it from running a Euro appliance or from running 2 things at once on the same half-circuit.

Two half-circuits

Remember how I said America splits the 240V to make 120V "legs"? That circuit is a "Multi-wire branch circuit" which uses both "legs" to provide two half-circuits of 120V and 15 amps each. Some of your receptacles (and possibly microwave) are on one half-circuit, and something else is on the other half-circuit. If you can figure out which ones (an electrician can easily mark this for you), you can arrange your appliances so you have one big heat appliance on each one, and then you won't trip!

  • 1
    Wow! Thank you for the detailed explanation. This helps! I moved the kettle to the other end of the kitchen - away from the outlet with the microwave. The kettle is 1000W and the microwave is 1200W, now I understand why the breaker tripped when I had both on!
    – insat3D
    May 8, 2020 at 22:23
  • 4
    I'm not sure this answer needs the meander into Euro appliances - almost certainly that has no bearing on OP's situation. It's almost certainly a MWBC and likely both outlets are split duplex - OP is in Toronto and this is a very common wiring strategy in Canadian kitchens of that age. Shifting the kettle to the top outlet in the duplex is probably the answer - OP should check the wiring layout under the receptacle cover to be sure.
    – J...
    May 9, 2020 at 14:15
  • 2
    @J... agreed. Yes at the time I didn't know the issue. May 9, 2020 at 17:07
  • @J... I am supposing it would be helpful if the OP's Microwave was on a standalone Circuit - I believe in the USA that is code to be on a dedicated circuit if over the range. I could be wrong - but I am thinking it is - either way if one were to put it on its own dedicated circuit - it will not likely trip unless there is a real issue and not an oops too much stuff at once issue.
    – Ken
    Jul 19, 2021 at 3:04
  • 1
    @Ken Yes, it's code in Canada also, but as in the US it wasn't always and we also have older homes here. Running a new circuit is sometimes not an option for OP, financially or otherwise, but yes that would naturally be ideal.
    – J...
    Jul 19, 2021 at 9:23

The 1/2 off position shows that the breaker tripped. It sounds like your house is wired like I used to wire. A multi wire branch circuit with the top receptacle on 1 breaker and the bottom on another. To reset the breakers pull them completely to the off position. Then pull them to the on position. If one of them clicks and returns to the mid position the over current may be due to a short in the wires. I have not had issues with square D resetting when properly cycled to off then on positions.

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