RE: Relay types - impulse vs latch?

["Keith Doxey" <ukha@xxxxxxx>]

1. No. They are designed to be operated for long periods.

2. Another pulse. One thing to beware of. If a latching relay was operated
when the power failed, it would still be operated when the power is
restored
whereas a normal relay would release and would not operate again unless you
specifically applied voltage to the coil.

Keith

-----Original Message-----
From: Andrew Richards [mailto:andrew.richards@xxxxxxx]
Sent: 15 February 2002 15:37
To: ukha_d@xxxxxxx
Subject: [ukha_d] Relay types - impulse vs latch?


I'm planning to use 12/24v relays for mains switching of lights etc, but
I've come across two different types of relay - impulse and latch.  As I
understand it, impulse relays are active only when the coil is energised,
whereas latching relays just require a momentary signal through the coil to
become and stay active.

Assuming this is right, I have a couple of qs:

1. Is an impulse relay damaged by keeping the coil active all the time?

2. How do you switch off a latching relay?

Any electricians out there?

Regards

Andrew


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