Relays are commonly used components in automotive control circuits. It uses the principle of electromagnetic induction to control the on/off of a certain circuit, thereby controlling the large current with a small current, thereby reducing the current load on the control switch contacts and protecting the switch contacts from erosion. Electromagnetic relays are widely used in automobiles. Common relays include power relay, start relay, horn relay, fog lamp relay, wiper relay, etc. The structure of an electromagnetic relay generally consists of an iron core, coil, armature, return spring, contacts, etc. The following figure shows the internal structure of a normally open and normally closed hybrid relay
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