X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 07 Nov 2007 09:46:33 -0500 Message-ID: X-Original-Return-Path: Received: from [206.246.194.60] (HELO visi.net) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2459311 for lml@lancaironline.net; Tue, 06 Nov 2007 23:04:18 -0500 Received-SPF: none receiver=logan.com; client-ip=206.246.194.60; envelope-from=rpastusek@htii.com Received: from [69.143.130.212] (account rpastusek@htii.com HELO dlhtpax009) by visi.net (CommuniGate Pro SMTP 4.2) with ESMTP id 241545892 for lml@lancaironline.net; Tue, 06 Nov 2007 23:03:10 -0500 From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Fuses Vs. Breakers X-Original-Date: Tue, 6 Nov 2007 23:03:31 -0500 X-Original-Message-ID: <008701c820f3$2be85f90$83b91eb0$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0088_01C820C9.43125790" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Acgg3ulb09TAE1dxSBafd4GB03xQFwAEpmXA Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_0088_01C820C9.43125790 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Dennis Johnson writes: By the way, what is the reason for using breakers for high current devices like the hydraulic pump if other circuits are protected by fuses? Dennis, My rationale for using a circuit breaker on the hydraulic pump is to be able to power it down in flight if needed. There are several hydraulic/electrical system failures that will cause the pump to run continuously. This will destroy it in pretty short order; hence the ability to power it down if it tries to keep running. The trim system was the only other thing that I thought about powering down if a component failed, but I put that one on a switch. BOB ------=_NextPart_000_0088_01C820C9.43125790 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dennis Johnson writes:

By the way, what is the reason for using breakers = for high current devices like the hydraulic pump if other circuits are protected by fuses?

Dennis, =

My rationale for using a circuit breaker on the hydraulic = pump is to be able to power it down in flight if needed. There are several = hydraulic/electrical system failures that will cause the pump to run continuously. This will = destroy it in pretty short order; hence the ability to power it down if it tries = to keep running… The trim system was the only other thing that = I thought about powering down if a component failed, but I put that one on a = switch.

BOB

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