Device profile · Specifications & compatibility
Sonoff WiFi Smart Plug S40
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- Sonoff WiFi Smart Plug S40 lists Maximum Load Power: 1800W; Maximum Load Current: 15A; Plug Format: Type B.
- Verify the load type and manufacturer instructions; a wattage figure alone does not establish compatibility with a particular appliance.
Browse more from Sonoff or explore all plugs in our catalog.
- Recorded year
- 2021
- Recorded warranty
- 1 year
- Dimensions
- 76 x 40 x 32 mm
- Weight
- 74g
The details that shape your choice
Sonoff WiFi Smart Plug S40 Quick Features
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From specification to decision
Sonoff WiFi Smart Plug S40: Capabilities And Limitations
Based on listed specifications, not hands-on testing. Manufacturer sources are linked where checked.
What it offers
A Home Assistant integration is listed, providing an integration path to verify for the exact model. Check the exact integration and firmware. A catalog integration label does not establish local control, official support or available entities.
View Home Assistant details →
What to consider
No specific limitation is established here. Check installation requirements and compatibility before choosing.
Still needs verification
Confirm these details if they matter to your setup.
Questions About Sonoff WiFi Smart Plug S40
What is the maximum load power of Sonoff WiFi Smart Plug S40?
Maximum Load Power: 1800W. Verify the load type and manufacturer instructions; a wattage figure alone does not establish compatibility with a particular appliance.
View Maximum Load Power specifications →What is the maximum current of Sonoff WiFi Smart Plug S40?
Maximum Load Current: 15A. Check voltage, load type and installation instructions alongside the current rating.
View Maximum Load Current specifications →Which plug format does Sonoff WiFi Smart Plug S40 use?
Plug Format: Type B. Match the physical format and electrical rating to the intended country and outlet.
View Plug Format specifications →Does Sonoff WiFi Smart Plug S40 support Matter?
Matter is listed as “SONOFF Hub required”. The stated condition applies to this feature. Verify the exact device type, firmware and features exposed in your chosen platform. Matter support is not proof of feature parity. The device is not Matter itself: SONOFF lists it among the eWeLink Wi-Fi models its Matter bridges (Zigbee Bridge Ultra, iHost, NSPanel Pro) republish into Matter.
View Matter specifications →Does Sonoff WiFi Smart Plug S40 work with Home Assistant?
Yes, according to the listed specifications. Check the exact integration and firmware. A catalog integration label does not establish local control, official support or available entities.
View Home Assistant specifications →Explore the full picture
Sonoff WiFi Smart Plug S40 Specifications
Recorded catalog values. Expand notes for qualifications; unknown values are not treated as missing features.
3 of 22 fields matched to manufacturer documentation. Source checks apply only to the named model and stated scope. Other fields remain catalog data. How we verify specifications →
Power7 fields
| Plug Format | Type B |
|---|---|
| Maximum Load Power | 1800W |
| Maximum Load Current | 15A |
| Load Voltage | 120V |
| Overheat Overload Protection | Yes |
| Energy Monitoring | Yes |
| Usb Charging | No |
Connectivity6 fields
| 2.4 GHz Wi-Fi | Yes |
|---|---|
| 5 GHz Wi-Fi | No |
| Bluetooth | For Pairing |
| Z Wave | No |
| Zigbee | No |
| Thread | No |
Features3 fields
| On Off Button | Yes |
|---|---|
| Zigbee Router | No |
| Automations | YesManufacturer sourceTimers can schedule switching. Sonoff WiFi Smart Plug S40 manufacturer product page →
The source covers S40 and S40 Lite. These shared controls do not establish energy metering for the Lite version. Document check only; not a hands-on test or verification of every regional or firmware variant. |
Integrations6 fields
| Google Home | YesManufacturer sourceGoogle Home voice control is supported. Sonoff WiFi Smart Plug S40 manufacturer product page →
The source covers S40 and S40 Lite. These shared controls do not establish energy metering for the Lite version. Document check only; not a hands-on test or verification of every regional or firmware variant. |
|---|---|
| Alexa | YesManufacturer sourceAlexa voice control is supported. Sonoff WiFi Smart Plug S40 manufacturer product page →
The source covers S40 and S40 Lite. These shared controls do not establish energy metering for the Lite version. Document check only; not a hands-on test or verification of every regional or firmware variant. |
| Apple Home | SONOFF Hub requiredDetails & conditionsSONOFF lists this model among the eWeLink Wi-Fi devices its Matter bridges (Zigbee Bridge Ultra, iHost, NSPanel Pro) publish to Matter, which is how it reaches the Apple Home app. |
| SmartThings | Yes |
| Home Assistant | Yes |
| Matter | SONOFF Hub requiredDetails & conditionsThe device is not Matter itself: SONOFF lists it among the eWeLink Wi-Fi models its Matter bridges (Zigbee Bridge Ultra, iHost, NSPanel Pro) republish into Matter. |
How this device compares
Sonoff WiFi Smart Plug S40 vs Other Similar Models
Statistical context from 37 plugs in this catalog. These figures describe our recorded data, not independent measurements.
Recorded feature coverage
2.4 GHz Wi-Fi: 23 of 37 known answers are Yes
Connectivity: 62% among explicit Yes/No answers; 0 of 37 devices have no resolved answer. Check the specifications for this model’s conditions.
Recorded feature coverage
Energy Monitoring: 25 of 37 known answers are Yes
Power: 68% among explicit Yes/No answers; 0 of 37 devices have no resolved answer. Check the specifications for this model’s conditions.
Recorded feature coverage
Overheat Overload Protection: 21 of 24 known answers are Yes
Power: 88% among explicit Yes/No answers; 13 of 37 devices have no resolved answer. Check the specifications for this model’s conditions.
Brand representation in this directory
10 of 37 models are from Sonoff
Counts plugs listed here, not sales or market share. Catalog inclusion does not imply a recommendation.
Side-by-side specification comparison
Compare Sonoff WiFi Smart Plug S40 vs Similar Plugs
See how Sonoff WiFi Smart Plug S40 stacks up against other plugs in this catalog. Compare specifications, compatibility and pricing.
Catalog specifications have not all been independently checked against manufacturer sources. Read our data and evidence methodology.