Working principle of DC relay

Relay is an electronic control device, it has a control system (also known as the input circuit) and control system (also known as the output circuit), usually used in automatic control circuit, it is actually a "automatic switch to control a larger current with small current". Electromagnetic relay is generally composed of iron core, coil, armature, contact etc.. As long as the coil ends with a voltage and current will flow through the coil in a, resulting in electromagnetic effects, the armature will attract the electromagnetic force to overcome the spring to return to the core rally absorption, thereby driving the armature static and dynamic contact (normally open). When the coil power, the electromagnetic force disappears, the armature will return to the original position in the spring reaction, the dynamic contact with the original static contact (normally closed contact). This pull and release, in order to achieve the circuit in conducting cutting purposes. From the working principle of the relay can be seen, it is a kind of mechanical and electrical components, through the mechanical action to achieve the contact off, is a contact element.

The advantages of the relay output is available with AC and DC load different between different common points, and the voltage can also be different, with current up to 2A/ load load; but the relay output is not suitable for high frequency operation, which is decided by the life of the relay. The life with the load current increases, usually in the hundreds of thousands of times to Jl million times, some products can reach more than 10 million times, the response time is 10ms. Relay manufacturers