The accurate selection of relays is as follows:
1. Selection of the contact load
The first is the choice of contact, different relays and his contact contact and materials are very different, according to the needs of the circuit to choose the appropriate contact. Contact load refers to the exposure of the contact. The contacts of the relay can suffer a certain voltage and current when changing. Therefore, when using the relay, we should consider the voltage added to the contact and the current passing through the contact can not cross the contact load of the relay. For example, a relay has a contact load of 28V (DC) 10A, indicating that the relay touch can only be responsible on the circuit with a DC voltage of 28V, and the contact current is 10A, spanning 28V or 10A, which will affect the normal operation of the relay and even burn the touch.
2, the relay coil power supply selection
This means that the relay coil is used in direct current electricity (DC) is still replacement electricity (AC). Usually, the initial experts in the electronic manufacturing series, are the choice of electronic lines, and electronic lines usually choose DC power supply, so it is necessary to choose the coil is DC voltage relay.
3, the relay rated voltage selection
When selecting the relay rated voltage, the following aspects should be considered:
(1) Power voltage: the rated voltage of the relay should match the supply voltage, otherwise it will
Causes the relay to be unable to work properly.
(2) Load voltage: the rated voltage of the relay should be greater than or equal to the load voltage, otherwise the relay switch will be unstable or burned out.
(3) Ambient temperature: the rated voltage of the relay is also affected by the ambient temperature. Usually love
In condition, the higher the ambient temperature, the higher the rated voltage of the relay to ensure its normal operation.
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