X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 22 Feb 2010 23:09:24 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-galgo.atl.sa.earthlink.net ([209.86.89.61] verified) by logan.com (CommuniGate Pro SMTP 5.3.2) with ESMTP id 4133741 for lml@lancaironline.net; Mon, 22 Feb 2010 12:34:34 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=klYv6ampv1a5kmDXm8qRkgtk8jtGGT9duSsek9emo3JlrziF8mBQQ3nnQ0i5/l0o; h=Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [216.57.118.190] (helo=ccaselt3) by elasmtp-galgo.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1NjcAP-0003CF-SB for lml@lancaironline.net; Mon, 22 Feb 2010 12:33:58 -0500 X-Original-Message-ID: <4DF3EEA47CDA48538D0023AB318E8ECB@nvidia.com> From: "Colyn Case at earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Solid State Contactors -- SuperSwitch? X-Original-Date: Mon, 22 Feb 2010 12:33:57 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_03D5_01CAB3BB.4D4A6D60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9406850f7df44a7942208b43337767372de350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 216.57.118.190 This is a multi-part message in MIME format. ------=_NextPart_000_03D5_01CAB3BB.4D4A6D60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Valin, I looked at this seriously but at the time there was very limited = information available on the web site for evaluating the failure mode. My biggest concern about a starter contactor is that there is the = potential for a dead short in the starter and I want to know I can get = the thing turned off. If you look at the dead short current on an = Odyssey battery, it's impressive. With a mechanical relay, you are = counting on the spring to open the contacts. With a solid state device = you are hoping that it doesn't fail in a way that conducts current. I = don't know what this one does and couldn't figure it out so I passed. = Maybe one of the EE's on the list could provide some insight and know = how to ask the question of the vendor. (e.g. what heppens to your = device when I give it 1500 amps for 1 sec?) Colyn ------=_NextPart_000_03D5_01CAB3BB.4D4A6D60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Valin,
 
I looked at this seriously but at the = time there=20 was very limited information available on the web site for evaluating = the=20 failure mode.
My biggest concern about a starter = contactor is=20 that there is the potential for a dead short in the starter and I want = to know I=20 can get the thing turned off.  If you look at the dead short = current on an=20 Odyssey battery, it's impressive.  With a mechanical relay, you are = counting on the spring to open the contacts.   With a solid = state=20 device you are hoping that it doesn't fail in a way that conducts=20 current.   I don't know what this one does and couldn't figure = it out=20 so I passed.  Maybe one of the EE's on the list could provide some = insight=20 and know how to ask the question of the vendor.  (e.g. what heppens = to your=20 device when I give it 1500 amps for 1 sec?)
 
Colyn
 
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