Product Overview
The TZ-8166 is a vertical limit switch equipped with a spring rod actuator. It is used for mechanical position detection, stroke limit control, and equipment operation feedback in industrial automation systems. The spring rod actuator is suitable for applications where the moving part contacts the actuator through a flexible stroke and the switch needs to return automatically after operation.
This page describes model TZ-8166 only. The product is suitable for automation equipment, conveyors, machine tools, elevator equipment, mechanical travel control, and other industrial control systems that require flexible self-reset position sensing with IP65 protection.
Product Display
The TZ-8166 uses a vertical switch body with a spring rod actuator. The product structure includes a reinforced housing, aluminum alloy mounting base, spring actuator mechanism, terminal cover, and conduit section for wiring.
Key Technical Data
| Item | TZ-8166 |
|---|---|
| Product type | Vertical limit switch |
| Actuator type | Spring rod actuator |
| Contact form | 1NO + 1NC |
| NO terminal | 13–14 |
| NC terminal | 11–12 |
| Protection degree | IP65 |
| Operating force | 150 g max. |
| Release force | Not specified |
| Pre-travel | 30 mm max. |
| Overtravel | Not specified |
| Movement differential | Not specified |
| Operating position | Refer to drawing |
| Electrical life | 500,000 operations or above |
Features
- Double-circuit contact structure for NO and NC control logic.
- Spring rod actuator for flexible mechanical position detection.
- Self-reset actuation suitable for applications with moving parts contacting the actuator from the correct direction.
- Built-in contact box with double-spring mechanism for stable contact action.
- Reinforced plastic housing and aluminum alloy base for mechanical strength.
- Compact body structure suitable for industrial equipment installation.
- Water-proof and oil-proof construction for general industrial environments.
- IP65 protection degree when properly installed and sealed.
- Conduit design for convenient field wiring.
- The TZ-8 series provides other actuator configurations for different machine structures. This page focuses on the TZ-8166 spring rod type.
Drawing
Outline and Mounting Dimensions
The drawing is used to confirm the outline structure, mounting hole position, actuator movement direction, spring rod clearance, and cable entry direction of the TZ-8166. Before installation, check that the moving mechanical part can operate the spring actuator smoothly without excessive side force or permanent deformation.
Before installation, check the mounting hole position, actuator clearance, cable entry direction, and available operating stroke. The spring rod should be contacted smoothly by the moving mechanical part and should return reliably after the machine part leaves the operating area.
Contact Form
TZ-8166 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 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 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 | 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 |
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-8166 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-8166 |
|---|---|---|
| OF | Operating force, maximum | 150 g |
| RF | Release force, minimum | Not specified |
| PT | Pre-travel, maximum | 30 mm |
| OT | Overtravel, minimum | Not specified |
| MD | Movement differential, maximum | Not specified |
| OP | Operating position | Refer to drawing |
Selection Guide
Actuator and Motion Direction
TZ-8166 uses a spring rod actuator. It is suitable for applications where the moving part contacts the actuator through a flexible stroke and the switch needs to reset automatically after operation. The actuator should not be bent beyond its usable operating range or used as a mechanical stopper.
Electrical Load and Contact Rating
Before selecting TZ-8166, 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 and Reset
For TZ-8166, the operating force is 150 g maximum and the pre-travel is 30 mm maximum. The moving part must operate the spring rod reliably without permanent deformation. After actuation, the spring actuator must return smoothly to its original position.
Installation Environment
TZ-8166 has an IP65 protection degree and is suitable for industrial environments with dust, oil mist, and light water exposure. It is not designed for continuous immersion. Avoid direct high-pressure water jet unless additional protection is used. The cable entry must be properly sealed, and the ambient temperature should remain within -20°C to +70°C.
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.