Introduction the relay main components of electromagnetic relay

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    The relay is an electrical control device, when the input (excitationvolume) changes to the requirements, the electrical output circuit to make the controlled quantity of an electric appliance the occurrence of a predetermined step change. It has a control system (also known as the input circuit) and the controlled system (also known as the output circuit) the interaction between. 

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     The control circuit is usually applied to automation, it is actually a kind of "automatic switch to control large currentoperation with small current". It plays in the automatic adjustment circuit, safety protection, the role of conversion circuit.

Electromagnetic relay is generally composed of iron core, coil,armature, reed contacts.

       As long as the coil ends with a certain voltage, coil current will flow through certain, so as to generate electromagnetic effect, the armature will attract in the electromagnetic force to overcome thespring tension to return to core, which drives the armature of themoving contact and the fixed contact (normally open). When the coil power, the electromagnetic force disappears, the armaturewill return to its original location in the spring reaction, makecontact with the original static contact (normally closed contact)release. 

     This pull, release, so as to achieve the turn in the circuit,the purpose of cutting. For the relay "normally open, close"contact, it can be to distinguish between: relay coil is not energized in off the static contact state, called "normally open contact"; in the static contact state are called "normally closed contact". Relay generally have two shares for low voltage circuit,control circuit and high voltage circuit.