Relay mainly used in what occasions
In the equipment control circuit, the relay is a common device, generally used in small current, most of the role as a play pole to control the work of other large devices.
For how to select a relay:
1. Load voltage conditions: Relay application load is 125 to 270 up to 400VAC, DC is usually the largest switching 30VDC
2. Load current situation: dozens of milliampere A to 200A AC
3. Medium pressure requirements: up to about 5000VAC and then consider the addition of a relay.
4. Electrical life requirements. Usually 100,000 times. According to the commitment of the manufacturers.
5. Design installation volume requirements
6. Design and installation requirements.
These conditions are considered full, choose the kind of relay, but it has those properties, weigh the pros and cons like.
