Product Overview
The TZ-8122 is a waterproof vertical limit switch equipped with a sealed plunger actuator. It is used for mechanical position detection, stroke limit control, and machine operation feedback in industrial automation equipment. The sealed plunger actuator is suitable for applications where a moving part operates the switch through a controlled linear stroke.
This page describes model TZ-8122 only. The product is suitable for automation equipment, conveyors, packaging machines, machine tools, mechanical travel control, and other industrial control systems that require compact plunger-type position sensing with IP65 protection.
Product Display
The TZ-8122 uses a vertical switch body with a sealed plunger actuator. The product structure includes a reinforced housing, aluminum alloy mounting base, plunger mechanism, terminal cover, and conduit section for wiring.
Key Technical Data
| Item | TZ-8122 |
|---|---|
| Product type | Waterproof vertical limit switch |
| Actuator type | Sealed plunger |
| Contact form | 1NO + 1NC |
| NO terminal | 13–14 |
| NC terminal | 11–12 |
| Protection degree | IP65 |
| Operating force | 900 g max. |
| Release force | 150 g min. |
| Pre-travel | 1.5 mm max. |
| Overtravel | 4 mm min. |
| Movement differential | 1 mm max. |
| Operating position | 37 ± 0.8 mm |
| Electrical life | 500,000 operations or above |
Features
- Double-circuit contact structure for NO and NC control logic.
- Sealed plunger actuator for compact mechanical position detection.
- 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.
- Suitable for machinery requiring compact plunger actuation with controlled stroke.
- The TZ-8 series provides other actuator configurations for different machine structures. This page focuses on the TZ-8122 sealed plunger type.
Drawing
Outline and Mounting Dimensions
The drawing is used to confirm the outline structure, mounting hole position, actuator movement direction, plunger clearance, and cable entry direction of the TZ-8122. Before installation, check that the moving mechanical part can operate the plunger smoothly without side load or excessive impact.
Before installation, check the mounting hole position, actuator clearance, cable entry direction, and operating stroke of the sealed plunger. The actuator should be contacted smoothly by the moving mechanical part without excessive impact.
Contact Form
TZ-8122 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 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 | 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-8122 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-8122 |
|---|---|---|
| OF | Operating force, maximum | 900 g |
| RF | Release force, minimum | 150 g |
| PT | Pre-travel, maximum | 1.5 mm |
| OT | Overtravel, minimum | 4 mm |
| MD | Movement differential, maximum | 1 mm |
| OP | Operating position | 37 ± 0.8 mm |
Selection Guide
Actuator and Motion Direction
TZ-8122 uses a sealed plunger actuator. It is suitable when a moving plate, mechanical stop, cam surface, or machine part operates the plunger in a straight and controlled direction. The actuator should not receive excessive side load or direct heavy impact.
Electrical Load and Contact Rating
Before selecting TZ-8122, 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 TZ-8122, the pre-travel is 1.5 mm maximum, overtravel is 4 mm minimum, movement differential is 1 mm maximum, and release force is 150 g minimum. The moving part must operate the plunger reliably without excessive compression. After actuation, the plunger must return smoothly to its original position.
Installation Environment
TZ-8122 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.