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NNTP-Posting-Date: Fri, 23 Aug 2024 15:09:48 +0000
From: john larkin <jlarkin_highland_tech>
Newsgroups: sci.electronics.design
Subject: Re: DC relay latching voltage
Date: Fri, 23 Aug 2024 08:09:48 -0700
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On Fri, 23 Aug 2024 16:07:38 +0530, Pimpom <Pimpom@invalid.invalid>
wrote:

>A quick question:
>Is it reasonable to assume that most small general-purpose DC relays 
>will not engage at 50% or the rated coil voltage? If not, how about 40%?
>(This is *not* about the release voltage).

Most data sheets have a must-operate voltage and a must-release
voltage,  but typicals are well, typically, very different.

Test a few! I'd expect that it would be very unlikely for an em relay
to operate at 40%.

We test parts and document whatever we learn.



FTR-B3 relay  non-latch  12 volts  JL  June 2015

Coil measures 1.0K

Typical pickup  = 7.7 volts    spec is 9
        dropout = 2.1          spec is 1.2

The 5 volt version pulls in at about 2.5 and drops at 1.4.

One non-energized relay measured 47 and 44 mohms on its NC contacts,
measured at both 1.3 amps and 100 mA.

JL  Jan 2024