When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name: contactor.
Contactors typically have multiple contacts, and those contacts are
usually (but not always) normally-open, so that power to the load is
shut off when the coil is de-energized.
http://www.youtube.com/watch?v=RjYyAPcr_7k&feature=related
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