FAQ02163 of Solid-state Relays FAQ

FAQ No. FAQ02163

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Question

How are the internal Solid-state Relays circuits configured?

Answer

Examples of Solid-state Relays Internal Circuit Configuration

Load specifications

AC load

Zero cross function	Isolation	Circuit configuration	Model
Yes (See note 1.)	Photo- coupler		G3H G3B G3F G3NA (AC input)
No	Phototriac		G3NE G3J G3F G3H G3TA-OA
Yes (See note 1.)	Phototriac		G3PA-VD G3PB (single phase) G3NA (DC input) G3NE
Yes (See note 1.)	Phototriac		G3PB-2(N) (three phases) (See note 2.)
Yes (See note 1.)	Phototriac		G3PB-3(N) (three phases) (See note 2.)
Yes (See note 1.)	Photo- coupler		G3NA-4[][]B G3NH G3PA-4[][]B G3PB-5[][]B

Load specifications

DC load

Zero cross function	Isolation	Circuit configuration	Model
---	Photo-coupler		G3FD, G3HD G3BD G3TA-OD G3NA-D

Load specifications

AC/DC load

Zero cross function	Isolation	Circuit configuration	Model
No	Photo-diode coupler		G3FM

Note 1:
The zero cross function turns ON the Solid-state Relay when the AC load voltage is 0 V or close to 0 V. Solid-state Relays with the zero cross function are effective in the following ways.

・Clicking noise when a load is turned ON is reduced.

・Effects on the power supply are reduced by suppressing inrush current with loads, such as lamps, heaters, and motors, thereby reducing inrush current protection circuits.