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From: agn@bovic.Eng.Sun.COM (Andreas G. Nowatzyk)
Newsgroups: sci.electronics
Subject: Re: light switches in germany
Keywords: switch hermahy lighting control query
Message-ID: <7926@exodus.Eng.Sun.COM>
Date: 13 Feb 91 06:57:54 GMT
References: <1991Feb13.055251.8240@watdragon.waterloo.edu>
Sender: news@exodus.Eng.Sun.COM
Organization: Sun Microsystems, Mt. View, Ca.
Lines: 8


Said switches were usually based on a pneumatic monoflop in a remote
wiring closet. The relay coil depresses an air-piston with a valve to
let the air rush out and an adjustable leak that determines the time delay
until the contacts open. It is retriggerable: the delay starts from the
moment you release the momentary light switch. All switches are wired
in parallel and are frequently illuminated with a neon light that draws
a small current through the relay.