With the increased automation, control circuit and field circuit isolation between technology increasingly shows the importance of Optical coupling terminal blocks using common terminals and installed electronic devices, optical transmission coupled to the input signal and output signals are electrically isolated, with the true signal instructions.

Optical coupling terminal blocks has the following advantages: 1.small signal consumption, high switching frequency; 2. no mechanical movement, no contact bounce, the mill reported switching, long life, high insulation voltage; 3. not afraid of vibration; 4.volume regardless of location restrictions, easy to wire.

Purposes: for power system protection of the AC voltage, current loop, according to the points against measures called for strengthening the place of anti-interference capacitor.

 
Through the terminals, the AC input circuit: state protection to filter out "noise" interference "noise" interference can be filtered through the terminal.

Characteristics: 1, directly through the terminal connection to the anti-interference function, eliminating the need for anti-jamming box, boxes, and to broaden the protection screen position; 2, terminal-to-ground (and capacitors) can withstand DC2500V lasted 1min the pressure test.