Siemens 7PA2740 - CR4 Discussion Thread

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engilis Power-User Join Date: Mar 2010 Posts: 105	Siemens 7PA2740 07/15/2010 2:48 PM
	Have you ever heard problem about 7pa2740 relay of siemens ? contact isolation is weak auto transformer's circuit breakers trips while have no reason thanks ahead for your answers. __________________ Either exist as you are or be as you look. Rumi
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#1 Re: SIEMENS 7PA2740 07/15/2010 3:29 PM
	How are you using them? These are 110VDC fast acting relays for use in switchgear protection circuit contact amplification. What does that have to do with an autotransformer? The circuit dielectric rating is 2.5kV, but that doesn't mean you can switch that! __________________ All I every really wanted to be, was... A LUMBERJACK!.
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