Solid State Relay, 3 phase, load current 80A, AC-AC, equipped with LED indicator, zero-crossing switch, built-in RC, optical isolation, no electric spark, no noise, no contact, high switching speed and wide applications.
|On-state voltage drop
|Off-state leakage current
||2500V AC (1min)
||500МΩ with 500V DC
||Heat sink or fan needed for cooling
Tips: Solid state relay's working principle
SSR can be divided into AC SSR and DC SSR according to application, which can act as the load switch in the AC or DC power supply respectively, and therefore, cannot be mixed. The AC SSR is taken as an example to illustrate the working principle solid state relay. As a whole, SSR has only two inputs (A and B) and two outputs (C and D), which is a four-terminal device.
In its operation, as long as the A, B are given a certain control signal, you can control on-off state between C and D to achieve the switch function, in which the function of the coupling circuit is to provide an input/output channel for control signals input from A and B, but electrically disconnect input and output of SSRs to prevent the output from affecting the input. Components used in the coupling circuits are optical couplers, which has good action sensitivity, high response speed, high level of input/output insulation (withstand voltage). The load at the input is a light-emitting diode, which makes the SSR input very easy to match input signal level. In the usage, it can be directly connected with the computer output interface, that is, it is controlled by the logic level of "1" and "0".