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koolkinkajou asked How can I add supplment overcurrent for my relay-transformer?
I'm putting in a 240vac to 24 v relay transformer to hook up an thermostat. Even though it is already on a 20amp two pole circuit breaker in my house out of an abundance of caution I want to add supplemental over-current in the electrical box. To do this I would like to add an extra circuit breaker or fuse in the box but I don't see any parts to do this?
And got the following answer:
You can fuse either the high or low voltage side of the transformer, but it is impractical to fuse the 120 volt side of a small transformer, since it would be a very small amperage requiring a special order fuse. You will also not be able to find a small panel mount circuit breaker locally, but you may find one on eBay. That is why they are usually fused. Find the VA rating on your transformer, or KVA if it is a larger one. If it is shown in KVA, multiply the number by 1000 to get the VA rating. Do not leave out any decimal points. Divide the VA number by 24. This will give you the maximum amperage the transformer is rated for on the 24 volt side. If your are fusing the 120 side, divide the VA by 120 instead. Install an inline fuse holder with a fuse rated at the amperage you calculated (or as close as you can get without going over) in series with one of the 24 VAC wires. You may have to order the fuse if you can't find it at an electronics store. The voltage rating of the fuse and fuseholder should be 24 volts AC or DC (automotive is okay) or higher. If you choose to fuse the 120 volt side instead, the fuse and holder will have to be rated at 120 VAC (automotive not okay) or higher, also. Many manufacturers oversize the fuse on control circuits to avoid nuisance trips due to inrush currents when using fast-blow fuses. It is not uncommon to see 3 amp fuses used on a 40 VA transformer secondary.
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