WL-4A201/1A100 OMRON

• Mounting interchangeability with MY-series Relays.

• Operation indicator mechanism incorporated for at-a-glance 

monitoring of ON/OFF operation. In addition, a built-in operation 

indicator model is also included in this Relay Series.

• Do not touch the terminal section (charged section) of the Relay or 

Socket while power is being supplied. Electric shock may occur. 

• Never use a Relay for a load that exceeds the contact ratings of the 

Relay, such as the switching capacity. Doing so may result in 

reducing Relay performance for insulation failure, contact welding, 

and contact faults, and might even result in burning or other 

damage to the Relay itself. 

• Do not drop the Relay or dismantle it. Doing so may reduce Relay 

performance and might even result in burning or other damage to 

the Relay itself. 

• Relay durability is greatly affected by the switching conditions. 

Always test the Relay under actual application conditions to confirm 

applicability and use the Relay only for the number of switching 

operations that will not affect performance. Continued application of 

a Relay with reduced performance may result in insulation failure 

between circuits or in burning in the Relay itself. 

• Do not apply an overvoltage or incorrect voltage to the coil, and do 

not wire the terminals incorrectly. Incorrect application may prevent 

the Relay from performing its designed function, may affect 

external circuits, and may even result in burning or other damage to 

the Relay itself.

• Do not use the Relay in atmospheres containing inflammable or 

explosive gases. Switching arcs or Relay heating may result in fire 

or explosion. 

• Wire the Relay correctly according to the Precautions for Correct 

Use when performing wiring or soldering. If the Relay is used with 

wiring or soldering that is defective, abnormal heating while power 

is supplied may result in burning. 

Relay Application

• Before actually using the Relay, perform all possible tests to 

confirm applicability. Unexpected trouble can occur in actual 

operation that would not be anticipated in theoretical planning. 

• Unless otherwise specified, all ratings and performances given in 

this catalog are for JIS C5442 standard test conditions 

(temperature: 15 to 35°C, humidity: 25% to 75%, pressure: 86 to 

106 kPa). When testing the Relay in the actual application, use the 

operating environment that will exist in actual applications along 

with the actual load conditions. 

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