Product Overview
TZ-8108 is an adjustable roller lever vertical limit switch designed for mechanical position detection, stroke limit control, and machine operation feedback in industrial automation systems. The switch uses a roller lever actuator, allowing a moving cam, guide rail, plate, or mechanical stopper to contact the roller and actuate the internal contact mechanism.
This model is suitable for conveyors, packaging machinery, machine tools, access mechanisms, automated fixtures, and other equipment where stable mechanical position sensing is required. This page describes model TZ-8108 only.
Key Technical Data
| Item | TZ-8108 |
|---|---|
| Product type | Vertical limit switch |
| Actuator type | Adjustable roller lever |
| Contact form | 1NO + 1NC double-circuit contact |
| NO terminal | 13–14 |
| NC terminal | 11–12 |
| Protection degree | IP65 |
| Operating force | 7.84 N max. |
| Release force | 0.49 N min. |
| Pre-travel | 20° max. |
| Overtravel | 75° min. |
| Electrical life | 500,000 operations or above |
Product Display
The TZ-8108 adopts a vertical switch body with an adjustable roller lever actuator. The product structure includes a reinforced housing, aluminum alloy mounting base, roller lever mechanism, terminal cover, and conduit section for cable entry.
Features
- Double-circuit contact structure for NO and NC signal output.
- Adjustable roller lever actuator for mechanical position detection.
- Built-in contact box with double-spring mechanism for stable operation.
- Reinforced plastic housing with aluminum alloy base structure.
- Compact body design suitable for machine and panel installation.
- Water-proof and oil-proof construction for industrial environments.
- IP65 protection degree for dust, oil mist, and light water exposure.
- Conduit design for convenient cable entry and wiring.
- Smooth actuation with sufficient overtravel allowance.
- The TZ-8 series also provides other actuator configurations; this page focuses on the TZ-8108 adjustable roller lever type.
Drawing
Outline and Mounting Dimensions
The drawing is used to confirm the product outline, mounting hole position, actuator direction, roller lever clearance, and cable entry direction before installation. The moving part should contact the roller smoothly and should not apply excessive impact to the actuator.
Contact Form
TZ-8108 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 Load Table
| Rated Voltage | Resistance Load | Lamp Load | Inductive Load | Motor Load | ||||
|---|---|---|---|---|---|---|---|---|
| NC | NO | NC | NO | NC | NO | NC | 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 motor, lamp, or inductive 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 | 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 |
| Approx. weight | 130 g to 150 g |
Environmental
| Item | Specification |
|---|---|
| Ambient temperature | -20°C to +70°C, with no icing |
| Humidity | <95% RH |
| Degree of protection | IP65 |
Operating Characteristics
The following operating characteristics apply to model TZ-8108 only. The mechanical stroke and actuator position should be checked according to the installation direction and the moving part of the machine.
| Parameter | Description | TZ-8108 |
|---|---|---|
| OF | Operating force, maximum | 7.84 N |
| RF | Release force, minimum | 0.49 N |
| PT | Pre-travel, maximum | 20° |
| OT | Overtravel, minimum | 75° |
| MD | Movement differential, maximum | 10° |
| TT | Total travel, minimum | 95° |
| OP | Operating position | Refer to drawing |
Selection Guide
Actuator and Motion Direction
TZ-8108 uses an adjustable roller lever actuator. It is suitable when the moving part contacts the switch through a cam, guide rail, plate, or mechanical stopper. The roller lever helps reduce friction during repeated mechanical contact. The actuator direction and roller contact angle should be confirmed before installation.
Electrical Load and Contact Rating
Before selecting TZ-8108, confirm whether the control circuit is AC or DC and identify the load type: resistance, lamp, inductive, or motor load. 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
The moving part should provide enough travel to operate the roller lever reliably while avoiding excessive mechanical impact. For TZ-8108, the pre-travel is 20° maximum, the overtravel is 75° minimum, and the total travel is 95° minimum. After operation, the lever must be able to reset smoothly.
Installation Environment
TZ-8108 is suitable for dusty, oily, and light water-exposure industrial environments. It is not designed for continuous immersion. Avoid direct high-pressure water jet unless additional protection is used. The cable entry should be properly sealed, and the ambient temperature should remain within the rated range.
Wiring and Contact Logic
The normally open contact uses terminals 13–14, and the normally closed contact uses terminals 11–12. Select NO or NC logic according to the control system. Safety or fault-detection circuits often use NC logic, but the final wiring design should follow the equipment control scheme.