On Sun, 19 Jul 2020 17:45:57 +0100, Cursitor Doom wrote:

On Sun, 19 Jul 2020 17:13:00 +0100, PeterC
wrote:

On Sun, 19 Jul 2020 15:31:19 +0100, Mike McLeod wrote:

I only ask because I'm making up a controller for one. I don't find
the 3 heat settings provide enough choice so I'll be controlling a
small triac via a PWM chip. Although the max current draw of this
appliance is only 350mA, the triac (a Z0607) is pretty puny and I
don't want it operating at too close to its max ratings obviously. I'm
using a snubber to be on the safe side WRT to back EMF anyway.

Here's the datasheet for the triac:

https://www.st.com/resource/en/datasheet/z00607.pdf

Will that do it or is something more meaty required?

Mine's 16/31/60W nd the PF is 1; VA and W show no difference.
Given the possible ****it! level (fire - bedding - unattended) having a good
margin is well worth it.

It would appear to be already sufficiently de-rated, though. That
triac is good for 800mA (and 600V!) and he's only putting a maximum of
350mA through it. Given the load is near enough purely resistive as
you say, there should be no problem. Where's the fire going to come
from??

Electronic components - magic smoke and pretty lights seem quite common.
--
Peter.
The gods will stay away
whilst religions hold sway