How to choose a relay?

Relay This is a kind of electrical appliance that is more common in industrial electrical appliances. For those who choose a lot of relays, they are not well aware of it. There are many questions in this regard. So how do you choose relays? Below we ask the editor of China Relay Network to give us a detailed introduction.

1. Select the rated operating current of the electromagnetic relay coil: a DC electromagnetic relay driven by a transistor or integrated circuit, whose coil rated operating current (generally 2 times the pull-in current) should be within the output current range of the driving circuit.

2. Select the type of electromagnetic relay contact and contact load: The same type of relay usually has a variety of contact forms for selection (electromagnetic relays are: single contact, double contact, multiple contact and normally open contacts, often Closed contacts, etc.) should be chosen for the contact type of the application circuit.

3, select the electromagnetic relay coil power supply voltage: When using electromagnetic relays, the first choice should be relay coil power supply voltage is AC or DC. The rated operating voltage of the relay should generally be less than or equal to the operating voltage of its control circuit.

4, choose the appropriate size of electromagnetic relay: the size of the relay is usually related to the size of the relay contact load, the choice of how much the size of the relay, but also should be based on the requirements of the application circuit.