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Adapt non-CFL-rated timer to operate CFL table lamp? Answered

Can someone help me create a box with a relay inside that sits between, electrically speaking, a non-CFL-rated timer and a table lamp with CFL bulbs? Ideally the non-CFL timer which I have plugs into wall outlet, relay box will plug into timer, and lamp will plug into relay box. What spec relay should I use for a lamp with a CFL equivalent to a 60 watt incadescent?



Best Answer 8 years ago

The relay will need to be - rated for 0.2A, as steveastrouk points out - rated for 15W - rated for use with CFLs. The last part is probably the hardest to determine. I suspect the time-switch is rated as not for use with CFLs because of its switching behaviour, but I can't say off the top of my head whether commercial relays will act the same way- you'd probably have to check with the vendor. I suspect solid state relays (SSRs) may behave better because they won't suffer the physical properties of mechanically switching relays, but I can't be sure- again, ask the relay vendor.

most relays I just searched for need a dc current to operate the relay coil itself (I know there are ac models, I just cant find any... To use a dc one you'll need a rectifier (wall wart) to close the circuit - also hooked up to the timer output...then the relay would close the circuit for the inductive load.

only trouble with the big ones is they cost big dollars... :( You are however, correct :D

get a wall wart, (like a cellphone charger thing) when power is applied, the wall wart will put out DC to the relay, the relay will turn on

Any relay that can handle more than 0.2 A of AC load will be fine. Make sure the coil of the relay is mains rated too.