The EL3H4 (A) (TA)-G is a Transistor Output Optocoupler manufactured by Everlight. It is an optoelectronic device that provides electrical insulation between two ports, usually between a low-voltage control circuit and a high-voltage output circuit. It uses a light-emitting diode (LED) and a photosensitive detector to transfer electrical signals from one side to the other without direct contact. The EL3H4 (A) (TA)-G optocoupler has a CTR range of 30~40%, isolation voltage of 1000Vrms (min) at 50/60Hz and can handle a maximum peak current up to 30mA. This optocoupler is suitable for applications such as power supplies, motor controls, high-voltage and high-power devices, instrumentation and industrial process controllers.