Product Overview
The WLNJ-S2 is a heavy duty limit switch equipped with a stainless steel cats whisker spring lever actuator. It is used for mechanical position detection, travel limit control, and movement feedback in industrial automation equipment. The flexible spring actuator allows contact from different directions, making it suitable for machine structures where the moving part may approach the switch from a variable angle.
This page describes model WLNJ-S2 only. The switch is commonly used on conveyors, cranes, hoists, elevators, machine tools, packaging equipment, and other industrial systems that require reliable travel limit or position detection under dusty, oily, or general outdoor industrial conditions.
Product Display
The WLNJ-S2 uses a heavy duty limit switch body with a long stainless steel cats whisker spring actuator. The product structure includes an operating head, contact mechanism, reinforced enclosure, terminal section, and conduit connection for industrial wiring.
Key Technical Data
| Item | WLNJ-S2 |
|---|---|
| Product type | Heavy duty limit switch |
| Actuator type | Stainless steel cats whisker spring lever |
| Contact form | Double-circuit NO + NC |
| NO terminal | 3–4 |
| NC terminal | 1–2 |
| Operating force | 1.47 N max. |
| Pre-travel | 40 ± 20 mm |
| Operating speed | 1 mm to 1 m/s |
| Operating frequency | Electrical: 30 operations/min |
| Protection degree | IP66 |
| Electrical life | 500,000 operations or above |
Features
- Stainless steel cats whisker spring lever actuator for flexible multi-direction contact.
- Double-circuit contact structure for NO and NC control logic.
- Suitable for travel limit, position detection, and movement direction control.
- High mechanical strength with a reinforced industrial housing.
- Water-proof and oil-proof construction for harsh industrial environments.
- Built-in contact box with double-spring mechanism for long mechanical life.
- Conduit connection design for convenient field wiring.
- IP66 protection degree when properly installed and sealed.
Drawing
Outline and Mounting Dimensions
The drawing is used to confirm the body outline, mounting hole position, cats whisker lever length, actuator clearance, and conduit connection position of the WLNJ-S2. Before installation, check that the moving part can contact the spring lever smoothly without excessive impact or permanent deformation.
Contact Form
WLNJ-S2 uses a double-circuit contact structure. The normally open contact uses terminals 3–4 and closes when the actuator is operated. The normally closed contact uses terminals 1–2 and opens when the actuator is operated.
The contact logic should be selected according to the control circuit. Safety-related or fault-detection circuits often use NC logic, but the final wiring method must follow the electrical design of the equipment.
Ratings
Rated Load
| Rated Voltage | Resistance Load NC | Resistance Load NO | Lamp Load NC | Lamp Load NO | Inductive Load NC | Inductive Load NO | Motor Load NC | Motor Load NO |
|---|---|---|---|---|---|---|---|---|
| 125VAC | 10A | – | 3A | 1.5A | 10A | – | 5A | 2A |
| 250VAC | 5A | – | 2A | 1A | 5A | – | 3A | 1A |
| 480VAC | 3A | – | 1.5A | 0.8A | 3A | – | 1.5A | 0.8A |
| 600VAC | 1A | – | 1A | 0.5A | 1.5A | – | 1A | 0.5A |
| 8VDC | 10A | – | 6A | 3A | 10A | – | 6A | – |
| 14VDC | 10A | – | 6A | 3A | 10A | – | 6A | – |
| 30VDC | 6A | – | 4A | 3A | 6A | – | 4A | – |
| 125VDC | 0.8A | – | 0.2A | 0.2A | 0.8A | – | 0.2A | – |
| 250VDC | 0.4A | – | 0.1A | 0.1A | 0.4A | – | 0.1A | – |
Load Notes
- Surge current: NC 30A under, NO 20A under.
- Inductive load has a power factor of 0.4 minimum for AC and a time constant of 7 ms maximum for DC.
- Lamp load inrush current is approximately 10 times the steady-state current.
- Motor load inrush current is approximately 6 times the steady-state current.
- For inductive, lamp, or motor loads, the inrush current should be considered during circuit design.
Specifications
Electrical
| Item | Specification |
|---|---|
| Contact resistance | 25 mΩ max., initial value |
| Insulation resistance | 100 MΩ min. at 500 VDC |
| Dielectric strength 1 | 1000 VAC, 50/60 Hz for 1 minute between terminals of the same polarity |
| Dielectric strength 2 | 1500 VAC, 50/60 Hz for 1 minute between current-carrying and non-current-carrying metal parts |
| Dielectric strength 3 | 1500 VAC, 50/60 Hz for 1 minute between each terminal and ground |
| Electrical life | 500,000 operations or above |
Mechanical
| Item | Specification |
|---|---|
| Operating speed | 1 mm to 1 m/s |
| Operating frequency | Electrical: 30 operations/min |
| Vibration | 10–55 Hz, 1.5 mm double amplitude |
| Shock durability | 1000 m/s², approx. 100G |
| Shock malfunction | 300 m/s², approx. 30G |
Environmental
| Item | Specification |
|---|---|
| Ambient temperature | -20°C to +80°C, with no icing |
| Humidity | <95% RH |
| Degree of protection | IP66 |
Operating Characteristics
The following operating characteristics apply to model WLNJ-S2 only. The spring lever movement range and contact direction should be checked according to the machine structure and the movement of the operating part.
| Parameter | Description | WLNJ-S2 |
|---|---|---|
| OF | Operating force, maximum | 1.47 N |
| RF | Release force, minimum | Not specified |
| PT | Pre-travel, maximum | 40 ± 20 mm |
| OT | Overtravel, minimum | Not specified |
| MD | Movement differential, maximum | Not specified |
Selection Guide
Actuator and Contact Direction
WLNJ-S2 uses a stainless steel cats whisker spring lever actuator. It is suitable when the moving part may contact the actuator from different directions or when a long and flexible sensing area is required. The actuator should be contacted smoothly and should not be bent beyond its allowable operating range.
Electrical Load and Contact Rating
Confirm the circuit voltage, current, load type, and contact logic before selection. For motor, lamp, or inductive loads, select the switch according to inrush current as well as steady-state current.
Stroke and Reset
For WLNJ-S2, the operating force is 1.47N maximum and the pre-travel is 40 ± 20mm maximum. The operating part should actuate the spring lever reliably and allow the actuator to return to its neutral position after operation.
Installation Environment
WLNJ-S2 has IP66 protection and is suitable for dusty, oily, and general industrial environments when properly installed. The cable entry and conduit connector should be sealed correctly. Avoid continuous immersion and excessive direct impact.
Replacement Check
Before replacing an existing limit switch with WLNJ-S2, check actuator type, spring lever length, mounting dimensions, operating direction, rated load, conduit size, wiring logic, and available space around the actuator.