Re: Triacs

• To: tesla-at-pupman-dot-com
• Subject: Re: Triacs
• From: "Bill Noble" <william_b_noble-at-email.msn-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 03 Dec 1999 23:01:32 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

you DO NOT want a solid state relay.  Here in the USA they make on/off
switches for hot tubs, etc that are operated pneumatically - this will be
good for your purposes.  A triac can self trigger or burn out (short) just
when you need to switch off the coil, so it's not safe for your purposes.

A solid state relay has other stuff in it besides an SCR - typically
isolation between the signal and the switched load, soft start and so on.

----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, December 02, 1999 5:27 PM
Subject: Triacs


> Original Poster: Max Erhard <max.erhard-at-softhome-dot-net>
>
> I'd like to make a remote on/off switch for my power supply. So I turned
> to the relay section of the maplin (a UK supplier) catalogue, looking
> for a suitable device. The only ones that made the requirements were the
> solid state relays, the 25A version costing around £25.00, I can't
> remember exactly. Then I thought about what a solid state relay consists
> of, must be a triac and a few miscilaneous cheap components.
> So I turned to the semiconductor section of the catalogue and looked
> under triacs. A 600v, 25A triac costing, just under £4.00. Now here
> comes my question, is the manufacturer of solid state relays making a
> 600% profit or is there some cost I'm missing out. I don't know that
> much about triacs.
>
>
>

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