From: Bob Blick <bobblick@outlook.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Wed, 4 Aug 2021 15:32:57 -0700
Subject: [EE] Latching relay ratings
Thread-Topic: [EE] Latching relay ratings
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I'm helping a friend out with his camper's auxiliary 12 volt power, and I'd=
 like to set up an automatic low battery disconnect. His solar controller h=
as a low battery voltage dry contact output but it's rated for only 0.5A. I=
 know I could just connect a 40 Amp automotive relay to that, but then ther=
e'd be a constant 120 milliamp drain until the battery disconnected. So I a=
m thinking of using a high current latching relay and some logic. But all t=
he affordable latching relays, such as this 120 Amp Omron G9TB-K1ATW-E DC12=
  are rated for AC only. I'm assuming it's because high DC current could ca=
use the relay to unlatch due to electromagnetism, and running 12VDC at 30 A=
mps through the 277VAC 120A contacts isn't really going to be a problem. Or=
 am I wrong?

Bob
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