Datasheet
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B-298
APEM
Switches & 
Pilot Lights
Control Boxes
Emergency 
Stop Switches
Enabling 
Switches
Safety Products
Explosion Proof
Terminal Blocks
Relays & Sockets
Circuit 
Protectors
Power Supplies
LED Illumination
Controllers
Operator 
Interfaces
Sensors
AUTO-ID
Switches & Pilot Lights
Flush Silhouette
ø16
ø22
ø30
Miniature
Pilot Lights
HW
TW
YW
ø22 YW Series Switches & Pilot Lights
•Turn off the power to the YW series before starting installation, 
removal, wiring, maintenance, and inspection of the products. Failure 
to turn power off may cause electrical shocks or re hazard.
•To avoid burning your hand, use the lamp holder tool when replacing 
lamps.
•For wiring, use wires of a proper size to meet the voltage and current 
requirements. Tighten the M3.5 terminal screws to a tightening 
torque of 1.0 N·m. Failure to tighten the terminal screws may cause 
overheating and re.
Panel Mounting
•Remove the contact block from the operator (for pilot lights, remove 
the transformer or full voltage unit from the pilot light). Remove the 
locking ring from the operator. Insert the operator into the panel cut-
out from the front, tighten the locking ring from the back, then install 
the contact block to the operator.
Removing and Installing the Contact Block
➀ Pull up the locking lever.
➁ Turn the lever to the left.
➂ Pull out the contact bloc
k
1.   To remove the operator from the contact block, pull up the locking 
lever and turn it to the left. Then the operator can be pulled out.
2.   To reinstall, place the TOP marking on the operator and the TOP 
marking on the contact block mounting adapter in the same 
direction, and insert the operator into the contact block mounting 
adapter. Then turn the locking lever to the right.
Removing and Installing the Transformer 
1.   Insert a flat screwdriver (5 mm wide at maximum) into the latch 
hole on the transformer unit as shown in the photo below, and 
disengage the latch. Then pull out the operator.
2.   To reinstall, place the TOP marking on the operator and the latch in 
the same direction, and push the operator into the transformer.
➀
➁
Removing the Full Voltage Unit
➁
➀
1.   To remove the full voltage unit, squeeze the full voltage unit from 
both sides to disengage the latch as shown, and pull it out. Like 
the transformer unit, the full voltage unit can also be pulled out by 
inserting a flat screwdriver into the latch hole as shown.
2.   To reinstall, place the TOP markings on the operator and the latch 
on the full voltage unit in the same direction, and insert the operator 
into the full voltage unit.
Notes for Panel Mounting
1. 
Use the optional locking ring wrench (MW9Z-T1) to mount the 
operator onto a panel. Tightening torque must not exceed 2.0 N·m. 
Do not use pliers. Excessive tightening will damage the locking ring.
2.   For contact blocks and transformers housing LED and incandescent 
lamps, make sure not to press the lamps too hard, otherwise the 
lamp socket may be damaged.
Insertion Order of Lens and Marking Plate
Illuminated Pushbutton  Pilot Light
Marking Plate
Lens
Extended
Marking Plate
Lens
Mushroom
With Full Shroud
Marking Plate
Lens
Full Shroud
Flush
Extended
Dome
Flush Marking
Marking Plate
Lens
Lens
 Safety Precautions
Instructions
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