ENMG / LIMIT SWITCHES
ET8 / AT8
IP67 miniature limit switches
Prewired mechanical limit switches with multiple actuator options for position detection. The detailed selection data below uses the ET81 model codes shown on the official page.
Request a quote ↗TECHNICAL DATA / ET8 / AT8
Specifications & selection.
- Die-cast aluminium housing and silver-alloy mechanical contacts.
- Standard CF models have one SPDT changeover contact and a 2 m three-core cable.
- Roller, rod, plunger and slack-chain actuator options.
| Model | Actuator | Operating force (source: g) | PT | OT (source label) | MD |
|---|---|---|---|---|---|
| ET8104-CF-2 | Short nylon roller | 350 | 25° | 50° | 12° |
| ET8107-CF-2 | Adjustable rod lever | 350 | 25° | 50° | 12° |
| ET8108-CF-2 | Adjustable roller lever | 350 | 25° | 50° | 12° |
| ET8111-CF-2 | Top plunger | 1000 | 1 mm | 3 mm | 1 mm |
| ET8112-CF-2 | Top roller | 1000 | 1 mm | 3 mm | 1 mm |
| ET8166-CF-2 | Omnidirectional nylon rod | 200 | 30 mm | Not specified | Not specified |
| ET8167-CF-2 | Omnidirectional spring rod | 200 | 30 mm | Not specified | Not specified |
| ET8168-CF-2 | Omnidirectional steel rod | 200 | 30 mm | Not specified | Not specified |
| ET8158-CF-2 | Slack-chain actuator | Not specified | Not specified | Not specified | Not specified |
| Normally open | Normally closed | Actuator |
|---|---|---|
| ET8107-AF-2 | ET8107-BF-2 | Adjustable rod lever |
| ET8108-AF-2 | ET8108-BF-2 | Adjustable roller lever |
| ET8111-AF-2 | ET8111-BF-2 | Top plunger |
| ET8112-AF-2 | ET8112-BF-2 | Top roller |
| Parameter | Specification |
|---|---|
| Rated voltage | 250 VAC / 30 VDC |
| Resistive current | 3 A in technical table; overview says 5 A — confirm exact rating |
| Initial contact resistance | ≤30 mΩ |
| Insulation resistance | ≥100 MΩ at 500 VDC |
| Between non-continuous terminals | 500 VAC, 50/60 Hz, 1 min |
| Current-carrying to non-current-carrying parts | 1,500 VAC, 50/60 Hz, 1 min |
| Actuating speed | 0.5 mm/s to 50 cm/s, as stated |
| Mechanical frequency | 120 operations/minute |
| Mechanical endurance | ≥5,000,000 operations at stated rated travel |
| Electrical endurance | ≥500,000 operations at rated load |
| Operating temperature | −25 to +80°C |
| Protection | IP67; not intended for continuous immersion |
| Parameter | Specification |
|---|---|
| Body excluding actuator, cable and mounting ears | 39.84 × 22.5 × 17.4 mm |
| Overall body including ears | Approx. 48 mm long |
| Mounting holes / centre distance | 2 × diameter 4.2 mm / 21.0 mm |
| Recommended M4 mounting torque | 0.8–1.2 N·m |
| Cable / bend radius | 2 m, three cores / at least 30 mm |
| 8104 / 8108 roller | Diameter 8.2 mm |
| 8111 plunger | Diameter 7.2 mm; M8 thread |
| 8112 roller | Diameter 7.6 mm |
| 8107 / 8166 rod length | Approx. 100 mm adjustable / 101.5 mm |
| Weight | Not specified |
Selection & installation notes
- The source gives conflicting 3 A and 5 A ratings. Use the exact unit’s confirmed datasheet; do not assume a 5 A capability. Resistive ratings do not establish an inductive-load rating.
- Confirm COM/NO/NC with a continuity check while isolated; brown/blue/black are only typical colour assignments and may vary.
- The source labels OT as total travel and gives ambiguous rod-travel limits. Obtain the exact actuator drawing; do not use the switch as a mechanical stop.
- A slack-chain actuator is not by itself a certified emergency-stop device. Confirm the required safety architecture separately.
- Do not assume AT8 part numbers or ratings from ET81 codes. Confirm the exact family designation and any approval documents when ordering.
- Protect the cable root from pull and repeated flexing. Observe temperature limits and avoid corrosive or explosive atmospheres.
Based on the official Chinese product page and selection charts ↗. Checked 2026-09-15. Confirm the current specification for the exact model when ordering.
TECHNICAL RESOURCES
Plan your integration.
ET waterproof limit switch — English technical specification YZ26A15.
Confirm the model, actuator and rating against the technical specification and unit label before installation.