Snubber component types for a triac-controlled dimmer

Thread Starter

electrophile

Joined Aug 30, 2013
166
What kind of capacitors and resistors would be used for a snubber in a triac controlled dimmer that would typically control say ceiling fans. For the resistor would a 1W carbon composition be sufficient? Also the local hardware store recommended these two types of capacitors. One of them has an AC voltage rating (275V) while the other has a DC voltage rating (630V). Which of these would be appropriate? (images attached).
 

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Alec_t

Joined Sep 17, 2013
12,309
The cap should be an X2 rated one (which the one in the first pic is).
Without knowing the dimmer spec/characteristics I can't comment on the resistor, except to say that it needs to be rated for the mains voltage you have.
 

takao21203

Joined Apr 28, 2012
3,702
Dont use the DC capacitor by all means.
The x2 parts are approved for mains connection.

0.1uF is for very small watts, 220nf or 0.47 is better for a dimmer.
 

Thread Starter

electrophile

Joined Aug 30, 2013
166
@takao21203 Thanks! That helps.

@Alec_t The dimmer is supposed to dim/speed control incandescent lamps and ceiling fans working with AC mains voltage. The lamps are rated for not more than 100W and the ceiling fan no more than 75W.
 
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