X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Apr 2012 16:24:01 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-scoter.atl.sa.earthlink.net ([209.86.89.67] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5506384 for lml@lancaironline.net; Wed, 25 Apr 2012 12:34:58 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.67; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=KbzeIEV5CEa9oWL0dHRk0/ZtvDb0BPdtEztqAoDh5MF2WEQIVheDBvWnNdsuN9Xw; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [64.222.159.235] (helo=[192.168.1.24]) by elasmtp-scoter.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1SN5Ac-00018F-V1 for lml@lancaironline.net; Wed, 25 Apr 2012 12:34:23 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-1365-582177040 Subject: Re: [LML] Contactors vs Solid State Relays X-Original-Date: Wed, 25 Apr 2012 12:34:22 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <303BD3EA-A01E-4F1C-9B5A-1BC41AD756D6@earthlink.net> X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9400afbc254bb9420d9c5361ca3e2e61dbd350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.222.159.235 --Apple-Mail-1365-582177040 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Stan, I think if you take a hammer to one of those contactors and look inside = you will not be favorably impressed. I had one fall apart on my power grid as a result of an installation = error. This caused me to look into the specs. Here are some issues to think about: - What is the max current at which the unit will disconnect? - What is the coil hold current (amount to keep it closed)? - What is the susceptibility to contact deformation....and what kind of = electronic protection do I want to provide for that? - Max # cycles I ended up going with Kilovacs. These are still mechanical. They are = expensive but quite a bit more robust. You can look up on the web. I'm sorry I don't know much about solid state relays. I bet VP has = some opinions. Colyn On Apr 25, 2012, at 10:19 AM, Stan Fields wrote: I am doing the wiring of my Legacy and would like the group's advice on = the use of Solid State Relays like SSRDC50V80A Relay = Datasheet =20 =20 or a traditional mechanical contractor like a Cole Hershee 24115. =20 =20 They are about the same cost, and handle the same load but are there = other reasons why I haven't seen the SSRs used. I am using the Vertical = Power VP-X which makes extensive use of Solid State Relays so I wonder = if their time has come and I should design the power distribution with = SSRs? =20 Stan Fields L2K - 201 Austin --Apple-Mail-1365-582177040 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Hi Stan,

I think if you take a = hammer to one of those contactors and look inside you will not be = favorably impressed.

I had one fall apart on my power grid as = a result of an installation error.

This caused me to look into = the specs.

Here are some issues to think about:

- = What is the max current at which the unit will disconnect?

- = What is the coil hold current (amount to keep it closed)?

- = What is the susceptibility to contact deformation....and what kind of = electronic protection do I want to provide for that?

- Max # = cycles

I ended up going with Kilovacs. = These are still mechanical. They are expensive but quite a = bit more robust.

You can look up on the = web.

I'm sorry I don't know much about solid = state relays. I bet VP has some = opinions.

Colyn

On Apr = 25, 2012, at 10:19 AM, Stan Fields wrote:

I am doing the wiring of my Legacy = and would like the group's advice on the use of Solid State Relays = like <image002.png>SSRDC50V80A Relay Datasheet =

or a traditional mechanical = contractor like a Cole Hershee = 24115.

They are about the same cost, and = handle the same load but are there other reasons why I haven't = seen the SSRs used. I am using the Vertical Power VP-X which makes = extensive use of Solid State Relays so I wonder if their time has come = and I should design the power distribution with = SSRs?

Stan = Fields

L2K - 201