3E series solid state relay is a DC input control, three-phase AC zero conduction, zero-turn-off-type non-contact relay outputs, opto-isolated inputs and outputs, flame retardant epoxy potting materials engineering, three-way normally open switch type. Can directly control the three-phase motor loads, transformers and heaters, etc., with fast switching speed, no noise, corrosion resistance, anti-jamming features, when used with a solid state relay control appliances is the beginning of starting from zero voltage and zero current turn-off, so The ratio has a di / dt of small, smooth start-up performance, low on power radiated interference can be reduced when the back-EMF inductive load off, have a protective effect on the use of electrical appliances and solid-state relays, etc., and with the computer system, automatic control devices interface directly, can be widely used in various fields of military, industrial automation, and other enterprises.