Product Overview
The LSA-003 is a vertical limit switch with a sealed plunger actuator. It is used for mechanical position detection, stroke limit control, and machine operation feedback in industrial automation equipment. The plunger actuator is suitable for applications where a moving mechanical part presses the actuator directly to change the contact state.
This page describes model LSA-003 only. The product is suitable for machine tools, conveyors, lifting equipment, door mechanisms, packaging machinery, and other industrial control systems that require compact position sensing with water-proof and oil-proof construction.
Product Display
The LSA-003 uses a compact switch body with a sealed plunger actuator, reinforced housing, contact mechanism, terminal cover, and three-way cable outlet structure. The design supports flexible wiring direction and helps protect the internal contact unit from dust, oil, and water exposure.
Key Technical Data
| Item | LSA-003 |
|---|---|
| Product type | Vertical limit switch |
| Actuator type | Sealed plunger actuator |
| Contact form | 1NO + 1NC |
| NO terminal | 13–14 |
| NC terminal | 11–12 |
| Protection degree | IP66 |
| Operating force | 800 g max. |
| Release force | 400 g min. |
| Pre-travel | 1.8 mm max. |
| Tripping position | 2.0 mm, TP ±10% |
| Movement differential | 1.2 mm max. |
| Overtravel | 4.0 mm min. |
| Total travel | 5.8 mm min. |
| Electrical life | 300,000 operations or above |
Features
- Double-circuit contact structure for NO and NC control logic.
- Sealed plunger actuator for direct mechanical position detection.
- Built-in contact box with double-spring mechanism for stable contact action.
- Reinforced housing structure for mechanical strength.
- Water-proof and oil-proof construction for industrial environments.
- IP66 protection degree when properly installed and sealed.
- Three-way cable outlet design for flexible wiring direction.
- Compact body structure for installation in limited equipment space.
- Smooth operation with sufficient overtravel allowance.
- The LSA series provides other actuator configurations for different machine structures. This page focuses on the LSA-003 sealed plunger type.
Drawing
Outline and Mounting Dimensions
The drawing is used to confirm the outline structure, mounting hole position, actuator travel direction, plunger clearance, and cable outlet direction of the LSA-003. Before installation, check that the moving mechanical part can press the plunger smoothly and within the allowable travel range.
The actuator should be contacted by the moving part without excessive side load or impact. The mounting surface should keep the switch body stable, and the cable outlet should be sealed according to the installation environment.
Contact Form
LSA-003 uses a double-circuit contact structure with one normally open contact and one normally closed contact. The normally open contact uses terminals 13–14 and closes when the actuator is operated. The normally closed contact uses terminals 11–12 and opens when the actuator is operated.
Wiring logic should be selected according to the control circuit. Safety-related circuits often use NC logic, but the final selection should follow the electrical design of the equipment.
Ratings
| 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 | 5A | 5A | 1.5A | 0.7A | 3A | 3A | 2A | 1A |
| 250VAC | 5A | 5A | 1A | 0.5A | 3A | 3A | 1.5A | 0.8A |
| 8VDC | 5A | 5A | 3A | 3A | 5A | 4A | 3A | 3A |
| 14VDC | 5A | 5A | 3A | 3A | 4A | 4A | 3A | 3A |
| 30VDC | 5A | 5A | 3A | 3A | 4A | 4A | 3A | 3A |
| 125VDC | 0.4A | 0.4A | – | – | – | – | – | – |
| 250VDC | 0.2A | 0.2A | – | – | – | – | – | – |
Load Type Notes
- Inrush current: NC below 24A, NO below 12A.
- 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 | 300,000 operations or above |
Mechanical
| Item | Specification |
|---|---|
| Operating speed | 5 mm to 0.5 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 +70°C, with no icing |
| Humidity | <95% RH |
| Degree of protection | IP66 |
| Conduit connector | Default M18 × 1.5; PG11.5 type available with model suffix “-P” |
Operating Characteristics
The following operating characteristics apply to model LSA-003 only. The mechanical stroke and actuator position should be checked according to the installation direction and the moving part of the machine.
| Parameter | Description | LSA-003 |
|---|---|---|
| OF | Operating force, maximum | 800 g |
| RF | Release force, minimum | 400 g |
| PT | Pre-travel, maximum | 1.8 mm |
| TP | Tripping position | 2.0 mm, TP ±10% |
| MD | Movement differential, maximum | 1.2 mm |
| OT | Overtravel, minimum | 4.0 mm |
| TT | Total travel, minimum | 5.8 mm |
| Rotary indexing | Rotary indexing angle | Not applicable |
Selection Guide
Actuator and Motion Direction
LSA-003 uses a sealed plunger actuator. It is suitable for applications where the moving part presses the actuator in a straight direction. Avoid side loading, twisting force, or heavy impact on the plunger, as these conditions may affect movement accuracy and service life.
Electrical Load and Contact Rating
Before selecting LSA-003, confirm whether the circuit is AC or DC, the operating voltage, current, load type, and whether the control system uses NO or NC logic. For motor, lamp, or inductive loads, select the switch according to the inrush current and not only the steady-state current.
Stroke, Overtravel and Reset
For LSA-003, the pre-travel is 1.8 mm maximum, tripping position is 2.0 mm with TP ±10%, overtravel is 4.0 mm minimum, and total travel is 5.8 mm minimum. The moving part must operate the plunger reliably and allow the actuator to return smoothly after release.
Installation Environment
LSA-003 has an IP66 protection degree and is suitable for industrial environments with dust, oil mist, and water exposure. It is not designed for continuous immersion. The cable outlet and conduit connector should be properly sealed according to the installation environment.
Wiring and Contact Logic
The normally open contact uses terminals 13–14, and the normally closed contact uses terminals 11–12. Select the contact logic according to the control circuit. Safety or fault-detection circuits often use NC logic, but the final wiring method must follow the machine electrical design.