Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
you can use a mechanical or solid state relay depending on your voltage operation. just use the normally open terminal as the conduit of your current. there are 2 terminals on the relay, one is open and the other is close.
You are looking for a normally open relay (NO), The contacts can be single pole, single throw (SPST), or Double Pole Single Throw (DPST), or single throw double throw (SPDT), or, you get the idea. Go to www.digikey.com and type "relay" into the search engine. There will be many choices and may cause you to come back with more questions.