There are two types of automotive relays: change over relay and make and break relay. Each one has a high current circuit and a contact that is either normally open (NO) or normally closed (NC). The position of the contact depends on the type of relay and its design. Normally open relays have a broken contact at rest, whereas normally closed ones have a closed contact. The switch used to activate a make and break automotive relay is typically a toggle switch or push switch. You may be familiar with these switches from your daily life - the ignition switch on your car, for example.