How to choose an electromagnetic relay?

The so-called relay refers to an electric control device, which is an electric appliance that causes a predetermined step change of the controlled quantity in the electrical output circuit when the change of the input amount (excitation amount) reaches the specified requirement. A wide range of electrical products used in the industry is not very familiar with the choice of relays. There are many questions about this, so how should the relay be chosen? Today, Xiaobian will take you to learn and learn!

Electromagnetic relay purchase points and precautions:

1. Select the rated working current of the electromagnetic relay coil:

For DC electromagnetic relays driven by transistors or integrated circuits, the rated operating current of the coil (generally 2 times the pull-in current) should be within the output current range of the drive circuit.

2. Select the electromagnetic relay contact type and contact load:

The same type of relay usually has a variety of contact forms available (electromagnetic relays are: single set of contacts, double sets of contacts, multiple sets of contacts and normally open contacts, normally closed contacts, etc.), should be selected for the application circuit Contact type.

3. Select the electromagnetic relay coil power supply voltage:

When using an electromagnetic relay, first select whether the 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. Select the appropriate volume for the electromagnetic relay:

The size of the relay is usually related to the size of the relay contact load. The size of the relay should be selected according to the requirements of the application circuit.

Of course, the products produced by the regular formal enterprises have certain quality and performance guarantee. In order to ensure the quality and performance of the relays, Xiaobian suggests that you should choose the industry brand enterprises to purchase the products!

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