Two-circuit Limit Switch
WL-N/WL
Two-circuit limit switches that can be
selected to match the operating
environment and application
• Wide variety of head shapes, including Roller Lever,
Plunger, Flexible Rod, and Fork Lock Lever Switches.
• You can select the optimum actuator shape for the
workpiece shape and movement from a variety of
actuators.
• In addition to general detection, we also have environment
resistant models for harsh environments, sputter resistant
models for welding processes, and long-life models for
high-frequency use.
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Be sure to read
Safety Precautions
on page 62 to 67
and
Safety Precautions for All Limit Switches.
Features
General-purpose Switches
A Wide Range of Models
You can select the optimum product for the workpiece shape and
movement from a variety of actuators, including Roller Lever,
Plunger, Flexible Rod, and Fork Lock Lever Switches.
Features Common
DPDB Operation
The two-circuit double-break structure ensures circuit braking.
• Basic/Retention type Switches (WL-N)
11
14
13
Environment-resistant Switches
Six environment resistant models are available
Airtight Switches, Hermetic Switches, Heat-resistant Switches, Low-
temperature Switches, Corrosion-proof Switches, and Weather-proof
Switches are available.
You can select the model based on the onsite environment.
Za
(NO)14
13(NO)
12
(NC)11
12(NC)
Load
Load
• High-sensitivity/High-precision Switches (WL)
1
4
3
Spatter-prevention Switches
(NO)4
Za
3(NO)
2
Ideal for Welding Sites
Uses stainless steel and plastic materials that prevent the adhesion
of spatter.
They can be used to reduce problems caused by zinc power
generated during welding.
(NC)1
2(NC)
Load
Load
Degree of Protection; IP67
Models with Connectors to Reduce Wiring
A neon lamp or LED indicates the operating status. This makes
startup checks and maintenance easy.
Long-life Switches
Long-life Models for High-frequency
Applications
A mechanical durability of over 30 million cycles is achieved by
improving slidability and the wear resistance of the head.
Sensor I/O Connector Models to Match Wiring
Specifications
Direct-wire types and pre-wired types are available for easy
replacement of limit switches.
1
WL-N/WL
Product Configuration
Head/Actuator
Operating Characteristic
Typical models
General-
purpose
Standard *1
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
WLC@-N
WLG@
WLGCA2
WLD@-N
WLSD@-N
WLNJ-@-N
Plunger Actuators
Flexible Rod Actuators
Basic Switches
Fork Lock Lever Actuator
Retention type Switches
WLCA32-4@-N
Operation indicators *1
Roller Lever
Actuators
Indicator-equipped
Switches:Neon lamps
Indicator-equipped
Switches: Light emitting
diodes (LED)
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
WLC@-LE-N
WLG@-LE
WLGCA2-LE
WLC@-LD-N
WLG@-LD
WLGCA2-LD
WLD@-LE-N
WLSD@-LE-N
WLD@-LD-N
WLSD@-LD-N
Plunger
Actuators
Indicator-equipped
Switches:
Neon
lamps
Indicator-equipped
Switches: Light emitting
diodes (LED)
Basic Switches
Flexible Rod
Actuators
Indicator-equipped
Switches:
Neon
lamps
Indicator-equipped
Switches: Light emitting
diodes (LED)
Basic Switches
WLNJ-@LE-N
Basic Switches
WLNJ-@LD-N
Fork Lock
Lever Actuator
Indicator-equipped
Switches:
Neon
lamps
Indicator-equipped
Switches: Light emitting
diodes (LED)
Retention type Switches
WLCA32-4@LE-N
Retention type Switches
WLCA32-4@LD-N
Sensor I/O connectors
Roller Lever
Actuators
Direct-wired Types
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
High-sensitivity Switches
High-precision Switches
WLCA2-LDK@-N
WLG2-LDK@
WLGCA2-LDK@
WLCA2-@LD-M1@@-N
WLCA2-@LD-D@J-N
WLG2-@LD-M1@@
WLG2-@LD-D@J@
WLGCA2-@LD-M1@@
WLGCA2-@LD-D@J@
WLD28-@LDK@-N
WLD28-@LD-M1@@-N
WLD28-@LD-D@J-N
Pre-wired Types
Plunger
Actuators
Direct-wired Types
Pre-wired Types
Basic Switches
Basic Switches
*1. The standard wiring specification is the Screw terminal type.
*2. Wiring specification: Smart-click type is also available.
2
WL-N/WL
Head/Actuator
Operating Characteristic
Typical models
Environment-
resistant
*1
Airtight seal *4
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
WLC@-55-N
WLG@-55
WLGCA2-55
WLD@-55-N, WLSD@-55-N
Plunger Actuators
Flexible Rod Actuators
Basic Switches
WLNJ-@55-N
Hermetic seal *4
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
WLC@-139-N
WLG@-139
WLGCA2-139
WLD@-139-N, WLSD@-139-N
Plunger Actuators
Basic Switches
Flexible Rod Actuators
Basic Switches
WLNJ-@139-N
Heat-resistant
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
WLC@-TH-N
WLG@-TH
WLGCA2-TH
WLD@-TH-N, WLSD@-TH-N
Plunger Actuators
Flexible Rod Actuators
Basic Switches
WLNJ-@TH-N
Low-temperature
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
WLC@-TC-N
WLG@-TC
WLGCA2-TC
WLD@-TC-N, WLSD@-TC-N
Plunger Actuators
Flexible Rod Actuators
Basic Switches
WLNJ-@TC-N
Corrosion-proof
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
WLC@-RP-N
WLG@-RP
WLGCA2-RP
WLD@-RP-N, WLSD@-RP-N
Plunger Actuators
Basic Switches
Flexible Rod Actuators
Basic Switches
WLNJ-@RP-N
Weather-proof
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
WLC@-P1-N
WLG@-P1
Spatter-prevention *1 *3
Roller Lever Actuators
Basic Switches
High-sensitivity Switches
High-precision Switches
Basic Switches
WLCA2-@S-N
WLG2-@S
WLGCA2-@S
WLD28-@S-N
Plunger Actuators
Long-life *1 *2 *3
Roller Lever Actuators *4
Basic Switches
High-sensitivity Switches
High-precision Switches
WLMCA2-@-N
WLMG2-@
WLMGCA2-@
*1.
*2.
*3.
*4.
The standard wiring specification is the Screw terminal type.
Wiring specification: Direct-wire Connector type is also available. Contact your OMRON sales representative for further information.
Wiring specification: Pre-wired Connector type is also available. Contact your OMRON sales representative for further information.
A type with an operation indicator light is also available. For details, see Ordering Information.
3
WL-N/WL
Selection
WL-N/WL Actuator Types and Selection
Head
Appearance
Classification
Operating
force (OF)
Repeat
accuracy *1
Shock and
vibration
resistance *1
Description
• Can be used over a wide range, from positioning to
workpiece detection.
• Easy to use because the stroke in the direction of revolution
can be set to an angle from 45° to 90° (varies by model),
and the lever can be set to any angle over 360°.
• High-sensitivity Switches with minimal movement before
activation (example: WLG2) and High-precision Switches
with high repeatability (example: WLGCA2) are available.
• Adjustable length between dog and lever. (Consideration
must be given to telegraphing.)
• Can be used over a wide range, from positioning to
workpiece detection.
• High-sensitivity Switches with minimal movement before
activation (example: WLG12) are also available.
• Suitable for detection of a dog or workpiece with a large
amount of play. (Consideration must be given to
telegraphing.)
• Also good for detection of irregularly shaped workpieces.
• Lightest activation (WLCL-N) among rotating-type limit
switches.
• Rod length is adjustable.
• High-sensitivity Switches with minimal movement before
activation (example: WLG2) are also available.
• High repeatability, good for positioning detection.
• The workpiece movement direction and plunger movement
direction must be matched so that an unbalanced load is not
applied to the plunger.
★★★
Roller Lever
Medium
★★
*2
Roller Lever
Models
Adjustable
Roller Lever
Medium
★★
★★★
★★
Adjustable Rod
Lever
Medium
★★
★★
Plunger
Plunger Models
Large
★★★
★★★
Roller plunger
Large
★★★
★★★
• A wide range of operation is possible by attaching an
auxiliary actuator to a cam, dog, cylinder, or other part.
• High repeatability, good for positioning detection.
Ball plunger
Large
★★
★★★
• The tip of the plunger is made of a steel ball, which can be
operated in any direction with no limitations.
• The ball plunger is convenient when the mounting side is not
aligned with the movement direction of the dog or the Limit
Switch is actuated by two dogs in X and Y directions.
• Operation from any direction over 360° is possible,
excluding the axial direction.
• Lowest activation force of the limit switches. Effective for
detection of non-uniform directions and shapes.
• Large tolerance for workpiece play because the actuator
absorbs movement after activation.
• The resin rod minimizes damage to the workpiece.
• Operation from any direction over 360° is possible,
excluding the axial direction.
• Lowest activation force of the limit switches. Effective for
detection of non-uniform directions and shapes.
• Large tolerance for workpiece play because the actuator
absorbs movement after activation.
• The steel wire enables easy workpiece length adjustment,
and easy bending is possible.
• Operation from any direction over 360° is possible,
excluding the axial direction.
• Lowest activation force of the limit switches. Effective for
detection of non-uniform directions and shapes.
• Large tolerance for workpiece play because the actuator
absorbs movement after activation.
• Self-rotates when operated to a position of 55°, holds state
at the 90° position.
• Reciprocating motion can be detected with a single dog.
• To allow greater deviation in the roller position, two dogs can
be used.
Coil spring
Flexible rod
Models
Small
★
★
Resin rod
Small
★
★
Steel wire
Small
★
★
Fork Lock Lever
Models
Fork Lock Lever
Medium
★★
★★★
*1. Indications for repeat accuracy and shock and vibration resistance are as follows:
★:
OK,
★★:
Good,
★★★:
Excellent
*2. The top line shows High-precision Switches. The bottom line shows Basic Switches.
4
WL-N/WL
OMRON will combine the switch, Actuator, and wiring method required to build the ideal switch for your application.
According to Operating Environment
Environment
Normal
Ambient operating temperature
Water-resistant
to IP67.
Key specifications
−10°C
+80°C
General-purpose
Switches
Long-life Switches
Models
Standard model
High-sensitivity,
High-precision model
Standard model
High-sensitivity,
High-precision model
Standard model
*1
High-sensitivity,
High-precision model
*1
WL@-N
WLG@
WLM@-N
WLMG@
+5°C
High-temperature
+120°C
Environment-resistant,
Heat-resistant Switches
To increase heat resistance, the rubber material have
been
changed.
WL@-TH-N
WLG@-TH
−40°C
Low-temperature
+40°C
To increase resistance to cold, epichlorhydrin rubber
and other measures are
used.
A rubber material resistant to temperature changes is
used.
Stainless steel is
used
for the screws.
The roller is made of stainless steel
with
superior corrosion
resistance.
Corrosion-proof specifications have
been used
for the
housing, fluorine rubber has
been used
for rubber
parts, and stainless steel has
been used
for screws
and nuts (except for the actuator) to increase
resistance to oils, chemicals, and
weather.
Uses an airtight
built-in
switch.
Cables are attached. Uses a general-purpose
built-in
switch.
The cover screws, case cover, and conduit opening are
molded from epoxy resin to increase the seal. (The
cover cannot
be
removed.)
Standard model
*1
Environment-resistant,
Low-temperature Switches
High-sensitivity,
High-precision model
*1
WL@-TC-N
WLG@-TC
Outdoors
Environment-resistant,
Weather-proof
Switches
Standard model
*1
High-sensitivity,
High-precision model
*1
WL@-P1-N
WLG@-P1
Chemicals and oil
Environment-resistant,
Standard model
*1
Corrosion-proof Switches
High-sensitivity,
High-precision model
*1
Environment-resistant,
Airtight Switches
WL@-RP-N
WLG@-RP
Water
drops and mist
Standard model
*1
High-sensitivity,
High-precision model
*1
WL@-55-N
WLG@-55
Standard model
*1*2
Environment-resistant,
Molded-terminal Switches
High-sensitivity,
High-precision model
*1*2
WL@-139-N
WLG@-139
Operating environment
Constant
water
drops and mist
Cables are attached. Uses an airtight
built-in
switch.
The case cover and conduit opening are molded from
Standard model
*1*2
epoxy resin to increase the seal. (The cover cannot
be
Environment-resistant,
Molded-terminal Switches
High-sensitivity,
removed.)
High-precision model
*1*2
The SC connector can
be
removed, so it is possible to
use
flexible conduit for the cable.
Cables are attached. Uses an airtight
built-in
switch.
Environment-resistant,
Standard model
*1*2
The cover screws, case cover, and conduit opening are
Molded-terminal Switches
High-sensitivity,
molded from epoxy resin to increase the seal. (The cover
High-precision model
*1*2
cannot
be
removed.)
Cables are attached. Uses an airtight
built-in
switch.
The cover screws, case cover, and conduit opening are
molded from epoxy resin to increase the seal. (The
cover cannot
be
removed.)
Two-layer seal on actuator rotation shaft.
-141: The Head section is molded from epoxy resin;
Head direction cannot
be
changed.
-145: The Head section is molded from epoxy resin;
Head can
be
in any of 4 directions.
Cables are attached. Uses an airtight
built-in
switch.
The cover screws, case cover, conduit opening, and
head screws are molded from epoxy resin to increase
the seal.
(The cover and head cannot
be
removed.)
Rubber parts are made from fluorine rubber to
increase resistance to coolant.
To prevent spatter during
welding,
a heat-resistant
resin is
used
for the indicator cover and screws and
rollers are all made from stainless steel.
Environment-resistant,
Standard model
*1*2
Molded-terminal Switches
High-sensitivity,
High-precision model
*1*2
Environment-resistant,
Standard model
*1*2
Molded-terminal Switches
High-sensitivity,
High-precision model
*1*2
WL@-RP40-N
WLG@-RP40
WL@-140-N
WLG@-140
Constant
water
drops or splattering
cutting powder
WL@-141-N
WLG@-141
WL@-145-N
WLG@-145
Coolant
Environment-resistant,
Anti-coolant Switches
Standard model
*1*2
High-sensitivity,
High-precision model
*1*2
WL@-RP60-N
WLG@-RP60
Spattering from
welding
Spatter-prevention
Switches
Standard model
High-sensitivity,
High-precision model
WL@-@S-N
WLG2-@S
WLGCA2-@S
*1. Not all functions can be combined with environment-resistant models.
*2. For details on the hermetic structure, see the hermetic mold specifications on pages 40 and 41.
5
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