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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!local-1.nntp.ord.giganews.com!Xl.tags.giganews.com!local-4.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 23 Aug 2024 15:09:48 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: DC relay latching voltage Date: Fri, 23 Aug 2024 08:09:48 -0700 Message-ID: References: User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 33 X-Trace: sv3-4ja6mhnTv9PR+y1RqIG8CT3MSpzTiqJy2P8nkn3+WSkVqTQ1TqO8BCefHFWrx1jO+1EC4KTRLQz9OYi!X/dZIwX/Z547ClYzGxbb2DGpLjn2NzUl+tUDzalhxI0RYDGuNQHTpPdfroqlE/QVpwzQmaqV4Rp0!lqL0HQ== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 1946 On Fri, 23 Aug 2024 16:07:38 +0530, Pimpom 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