Product Overview
The WLNJ-30 is a heavy duty limit switch equipped with a high-strength coil spring lever actuator. It is used for mechanical position detection, travel limit control, and movement feedback in industrial automation equipment. The coil spring lever actuator allows contact from different directions, making it suitable for moving machine parts where the contact direction may vary during operation.
This page describes model WLNJ-30 only. The switch is commonly used on machine tools, conveyors, cranes, hoists, elevators, industrial doors, packaging equipment, and other systems that require reliable position or stroke detection.
Product Display
The WLNJ-30 uses a heavy duty switch body with a long coil spring lever actuator. The product structure includes an operating head, contact mechanism, metal-reinforced enclosure, terminal section, and conduit connection for industrial wiring.
Key Technical Data
| Item | WLNJ-30 |
|---|---|
| Product type | Heavy duty limit switch |
| Actuator type | High-strength coil 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
- High-strength coil spring lever actuator for flexible mechanical contact.
- Double-circuit contact structure for NO and NC control logic.
- Suitable for travel limit, position detection, and movement direction control.
- Reinforced industrial housing for heavy duty machine applications.
- 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, coil spring lever direction, actuator clearance, and conduit connection position of the WLNJ-30. Before installation, check that the moving part can contact the spring lever smoothly without excessive impact or permanent deformation.
Contact Form
WLNJ-30 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-30 only. The high-strength coil spring lever should be contacted within the allowable operating range and should not be used as a rigid mechanical stopper.
| Parameter | Description | WLNJ-30 |
|---|---|---|
| OF | Operating force, maximum | 1.47 N |
| RF | Release force, minimum | – |
| PT | Pre-travel | 40 ± 20 mm |
| OT | Overtravel | – |
| MD | Movement differential | – |
Selection Guide
Actuator Direction
WLNJ-30 is suitable for applications where a moving part may contact the actuator from different directions. The coil spring lever can absorb small alignment variations, but the contact should remain smooth and controlled.
Electrical Load
Confirm the operating voltage, load type, current, and contact logic before selection. For motor, lamp, or inductive loads, consider the inrush current rather than only the steady-state current.
Mechanical Stroke
The WLNJ-30 has a pre-travel value of 40 ± 20 mm. The installation should provide enough travel for reliable actuation while preventing permanent bending or excessive force on the spring lever.
Environment
The IP66 protection degree supports use in dusty, oily, and wet industrial environments when the switch is properly installed. Avoid continuous immersion and direct high-pressure water jets unless additional protection is provided.
Wiring Logic
Use terminals 3–4 for NO logic and 1–2 for NC logic. The final wiring method should match the machine control design and safety requirements.