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.
Standard CF model selection| Model | Actuator | Operating force (source: g) | PT | OT (source label) | MD |
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| ET8104-CF-2 | Short nylon roller | 350 | 25° | 50° | 12° |
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| ET8107-CF-2 | Adjustable rod lever | 350 | 25° | 50° | 12° |
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| ET8108-CF-2 | Adjustable roller lever | 350 | 25° | 50° | 12° |
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| ET8111-CF-2 | Top plunger | 1000 | 1 mm | 3 mm | 1 mm |
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| ET8112-CF-2 | Top roller | 1000 | 1 mm | 3 mm | 1 mm |
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| ET8166-CF-2 | Omnidirectional nylon rod | 200 | 30 mm | Not specified | Not specified |
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| ET8167-CF-2 | Omnidirectional spring rod | 200 | 30 mm | Not specified | Not specified |
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| ET8168-CF-2 | Omnidirectional steel rod | 200 | 30 mm | Not specified | Not specified |
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| ET8158-CF-2 | Slack-chain actuator | Not specified | Not specified | Not specified | Not specified |
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Published NO / NC variants| Normally open | Normally closed | Actuator |
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| ET8107-AF-2 | ET8107-BF-2 | Adjustable rod lever |
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| ET8108-AF-2 | ET8108-BF-2 | Adjustable roller lever |
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| ET8111-AF-2 | ET8111-BF-2 | Top plunger |
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| ET8112-AF-2 | ET8112-BF-2 | Top roller |
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Electrical and mechanical data| Parameter | Specification |
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| Rated voltage | 250 VAC / 30 VDC |
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| Resistive current | 3 A in technical table; overview says 5 A — confirm exact rating |
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| Initial contact resistance | ≤30 mΩ |
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| Insulation resistance | ≥100 MΩ at 500 VDC |
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| Between non-continuous terminals | 500 VAC, 50/60 Hz, 1 min |
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| Current-carrying to non-current-carrying parts | 1,500 VAC, 50/60 Hz, 1 min |
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| Actuating speed | 0.5 mm/s to 50 cm/s, as stated |
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| Mechanical frequency | 120 operations/minute |
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| Mechanical endurance | ≥5,000,000 operations at stated rated travel |
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| Electrical endurance | ≥500,000 operations at rated load |
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| Operating temperature | −25 to +80°C |
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| Protection | IP67; not intended for continuous immersion |
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Dimensions and installation| Parameter | Specification |
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| Body excluding actuator, cable and mounting ears | 39.84 × 22.5 × 17.4 mm |
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| Overall body including ears | Approx. 48 mm long |
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| Mounting holes / centre distance | 2 × diameter 4.2 mm / 21.0 mm |
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| Recommended M4 mounting torque | 0.8–1.2 N·m |
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| Cable / bend radius | 2 m, three cores / at least 30 mm |
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| 8104 / 8108 roller | Diameter 8.2 mm |
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| 8111 plunger | Diameter 7.2 mm; M8 thread |
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| 8112 roller | Diameter 7.6 mm |
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| 8107 / 8166 rod length | Approx. 100 mm adjustable / 101.5 mm |
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| Weight | Not specified |
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ET8104-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8104-CF-2 |
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| Actuator | Ø17.8 mm roller; 6 mm width |
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| Operating force OF | 350 gf |
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| Release force RF | 10 gf |
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| Pretravel PT | 25° |
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| Overtravel OT | 50° |
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| Differential travel MD | 12° |
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| Cable | 2 m, three cores; custom lengths by factory order |
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ET8104-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | 111.75 mm |
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| Body width / maximum pictured depth | 31.2 / 41.73 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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ET8107-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8107-CF-2 |
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| Actuator | Ø2.8 mm rod, 120 mm long in drawing |
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| Operating force OF | 350 gf |
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| Release force RF | 100 gf |
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| Pretravel PT | 25° |
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| Overtravel OT | 50° |
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| Differential travel MD | 12° |
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| Cable | 2 m, three cores; custom lengths by factory order |
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ET8107-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | Adjustable; 88.15 mm body/head datum |
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| Body width / maximum pictured depth | 31.2 / 45.7 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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ET8111-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8111-CF-2 |
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| Actuator | Top plunger Ø7.2 mm |
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| Operating force OF | 1000 gf |
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| Release force RF | 150 gf |
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| Pretravel PT | 1 mm |
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| Overtravel OT | 3 mm |
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| Differential travel MD | 1 mm |
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| Cable | 2 m, three cores; custom lengths by factory order |
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ET8111-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | 93.38 mm |
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| Body width / maximum pictured depth | 31.2 / 28.2 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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ET8112-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8112-CF-2 |
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| Actuator | Roller Ø12.7 mm; 7.2 mm width annotation |
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| Operating force OF | 1000 gf |
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| Release force RF | 150 gf |
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| Pretravel PT | 1 mm |
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| Overtravel OT | 3 mm |
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| Differential travel MD | 1 mm |
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| Cable | 2 m, three cores; longer cable by factory order |
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ET8112-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | 104.5 mm |
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| Body width / depth | 31.2 / 28.2 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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ET8166-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8166-CF-2 |
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| Actuator | Nylon rod taper Ø3–6 mm with metal spring section |
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| Operating force OF | 200 gf |
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| Release force RF | 100 gf |
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| Pretravel PT | 30 mm |
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| Overtravel OT | Not specified in original selection table |
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| Differential travel MD | Not specified |
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| Cable | 2 m, three cores; longer cable by factory order |
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ET8166-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | 163.8 mm |
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| Body width / depth | 31.2 / 28.2 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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ET8167-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8167-CF-2 |
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| Actuator | Spring rod Ø6 mm |
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| Operating force OF | 200 gf |
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| Release force RF | 100 gf |
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| Pretravel PT | 30 mm |
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| Overtravel OT | Not specified in original selection table |
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| Differential travel MD | Not specified |
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| Cable | 2 m, three cores; longer cable by factory order |
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ET8167-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | 166.7 mm |
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| Body width / depth | 31.2 / 28.2 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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ET8168-CF-2 — Exact model and motion data| Parameter | Value |
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| Model | ET8168-CF-2 |
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| Actuator | Smooth steel rod Ø5.6 mm; spring section Ø6 mm |
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| Operating force OF | 200 gf |
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| Release force RF | 100 gf |
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| Pretravel PT | 30 mm |
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| Overtravel OT | Not specified in original selection table |
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| Differential travel MD | Not specified |
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| Cable | 2 m, three cores; longer cable by factory order |
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ET8168-CF-2 — Original drawing — dimensions exclude cable| Parameter | Value |
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| Height datum in drawing | 162.3 mm |
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| Body width / depth | 31.2 / 28.2 mm |
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| Mounting-flange height | 65 mm |
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| Mounting centers | 21 mm horizontal / 56 mm vertical |
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| Through holes | Ø4.2 mm; check exact diagonal mounting arrangement |
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| Drawing tolerance | ±0.3 mm |
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| Mass | Not specified |
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Individual-model shared electrical and environmental reference| Parameter | Value |
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| Load voltage | 250 VAC / 30 VDC, resistive |
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| Current conflict | Original product image: 5 A; prose technical table: 3 A. Confirm current production rating. |
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| Operating speed | 0.5 mm/s to 50 cm/s |
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| Mechanical frequency | 120 operations per minute |
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| Initial contact resistance | 30 mΩ |
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| Insulation resistance | ≥100 MΩ; prose specifies 500 VDC test |
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| Dielectric withstand | 500 VAC between non-connected terminals; 1500 VAC live parts to non-live parts / earth; 50/60 Hz, 1 minute |
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| Mechanical / electrical life | ≥5 million at rated OT / ≥500,000 operations; exact electrical test load requires confirmation |
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| Ambient | −25 to +80 °C in general technical image |
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| Protection | IP67; no continuous-submersion rating established |
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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.
- The shared prose gives a much smaller 39.84 × 22.5 × 17.4 mm body; it conflicts with the model-specific original drawing. The dimensions above follow the original drawing. Confirm the production outline before mounting.
- The published 5 A and 3 A ratings conflict. Obtain the exact switch and load-category rating before load sizing; do not infer an inductive-load rating from the resistive figure.
- PT is pretravel and OT is overtravel beyond actuation in the original table. Set the actuator travel using the production drawing; do not use the switch as a mechanical end stop.
- Identify COM, NO and NC by the supplied wiring diagram and a de-energized continuity check; the typical brown/blue/black color mapping can vary by batch.
- Protect the cable entry from pulling and repeated bending, preserve seals and isolate the circuit before wiring. IP67 does not imply resistance to all liquids, pressure washing or indefinite immersion.
- This position switch page does not establish a safety integrity level or suitability as a complete emergency-stop device.
- For rod models, 30 mm is pretravel PT, not a verified maximum overtravel. Set the mechanism using the exact permissible travel; do not use the switch as a mechanical end stop.
- Series-level and individual-model references are retained separately where published data differ. Confirm the ordered model rather than treating every value as interchangeable.
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.
