Bright Toward Industrial Co., Ltd.

Sole Agent

OKITA

TELEDYNE RELAYS

JEL SYSTEM

JEL

Application Circuit

Application Circuit Examples

(1)Connection to Sensor

The SSR connects directly to the Proximity Sensor and Pontoelectric Sensor.

(2)Switching Contorl of Incandescent Lamp Application Circuit

(3)Temperature Contorol of Electric Furnace
Application Circuit

(4)Forward and Reverse Operation of Singlephase Motor
Note:	1.	The voltage between the load terminals of either SSR 1 or SSR 2 turned OFF is approximately twice as high as the supply voltage due to LC coupling.Bo sure to apply an SSR model with a rated output voltage of at least twice the supply voltage. For example,if the motor operates at a supply voltage of 100 VAC, the SSR must have an output voltage of 200 VAC or higher.
	2.	Make sure that there is a time lag of 30 ms or more to switch over SW1 and SW2.

(5)ON/OFF Control of Three-Phase Inductive Motor

Single SSRs in Combination

(6)Forward and Reverse Operation of Threephase Motor

Single SSRs in Combination

Make sure that signals input into the SSR Units are proper
if the SSR Units are applied to the forward and reverse
operation of a three-Phase motor.If SW1 and SW2 as shown in
the following circuit diagram are switched over simultaneously,a phase short-circuit
will result on the load side.which may damage the output elements of the SSR Units.
This is because the SSR has a triac as an output element that is turned ON until the
load current becomes zero regardless of the absence of input signals into the SSR. Application Circuit

Therefore,make sure that there is a time lag of 30 ms or more to switch over SW1 and
SW2.

The SSR may be damaged due to phase short-circuiting if the SSR malfunctions with noisein the input circuit of the SSR. To protect the SSR from phase short-circuiting damage,the
protective resistance R may be inserted into the circuit.

The value of the protective resistance R must be determined according to the with- standing inrush current of the SSR.For example,the G3NA-220B withstands an inrush current of 220 A.
The value of the protective resistance R is obtained from the following.

Considering the circuit current and weld time,insert the protective resistance into the side that reduces the current consumption.
Obtain the consumption power of the resistance from the following.
Application Circuit

Selection Guide PCB mount model	Selection Guide Panel mount model
Selection Guide built-in heat sink model	Option product list of SSR
Operating principle of SSR	Glossary
Considerations on Use of SSR	Application Circuit