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Re: [Amps] rotary switch - shorting/non-shorting

To: Tom Rauch <>, David G4FTC <>,"" <>
Subject: Re: [Amps] rotary switch - shorting/non-shorting
From: Bill Fuqua <>
Date: Thu, 30 Aug 2007 15:22:43 -0400
List-post: <>
Shorting and non-shorting are common terms in describing rotary switches.
The make-before-break , etc. are common for toggle switches and relays.

Bill wa4lav

At 10:26 AM 8/30/2007 -0400, Tom Rauch wrote:
> >
> > Aren't these switches known as "Make-Before-Break" and
> > "Break-Before-Make".
>Yes, that's another name in technical descriptions. In
>catalogs and by manufacturers (at least on this side of the
>pond) they are more commonly called "shorting" and
>"non-shorting" rather than the "make before break".
>For example Centralab uses "shorting" to describe a "make
>before break" contact. Non-shorting is used in their
>catalogs to describe "break before make".
>Amp Supply was big on ordering the wrong switch. What they
>wanted was "pick up and hold" design but with "non-shorting"
>contacts. What they always seemed to order was a "shorting"
>You have to be very careful to look at what the manufacturer
>does, but in general (at least in the USA) the term
>"shorting" means make before break. That generally means the
>switch has much lower contact to contact voltage holdoff on
>adjacent contacts.
>73 Tom
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