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Kasa EP40 vs KP401: Which Outdoor Plug Fits Your Setup?

The EP40 page documents two outdoor outlets usable together or individually; the KP401 US V1 guide depicts one Smart Outlet. If one outlet is enough, that count difference does not decide between them. Compare the listed dimensions with your actual clearance and verify KP401 axis orientation if a close fit matters.

Published by Pickoryx · Published 2026-10-15

Source checked 2026-10-15 21:45 UTC

Products compared

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The buying question

Do you need two independently usable outdoor outlets in one plug body, or is one enough—and how should you check the body dimensions against the space at your receptacle?

The EP40 page documents two outdoor outlets that can be used together or individually; the KP401 US V1 guide depicts one Smart Outlet. Their listed dimensions also differ, but the KP401 datasheet does not label its axis order, so dimensions are a clearance check rather than a fit guarantee.

Quick verdict

Choose Kasa KP401 Outdoor Smart Plug if

  • You are considering KP401, but one-outlet sufficiency alone is not a reason to prefer it over EP40; compare other needs and current offers. If placement matters, verify the KP401 dimension-axis order and measure your space.
View Kasa KP401 Outdoor Smart Plug on AmazonPaid link
When the recommendation changes
  • When one outlet is enough, outlet count alone does not decide between EP40 and KP401; compare other requirements and current offers. If you need two devices at one plug, EP40 documents two separately usable outlets while the KP401 US V1 guide depicts one.
  • If clearance is tight, use the full dimension lines and confirm axis orientation for KP401 before deciding; the listed numbers alone do not prove fit.

The differences that matter

Independently Controlled Outlet Count

Kasa EP40 Outdoor Smart Plug

The EP40 product page says one plug can serve two outdoor devices together or individually.[1]

Kasa KP401 Outdoor Smart Plug

The KP401 US V1 guide appearance page labels and depicts one Smart Outlet, and says the single control button turns the plug-in device on or off. The separate KP401 datasheet uses plural wording (“each outlet”), so the one-receptacle conclusion is scoped to the model-specific guide diagram.[3, 4]

What this changes: Choose by the number of devices you need to connect at one plug: EP40 documents two separately usable outlets, while the KP401 US V1 guide depicts one. If one outlet is enough, this evidence does not decide between them; consider other requirements and current offers. If your exact unit has a different hardware revision, check its matching guide.[1, 3, 4]

The better fit depends on your priorities

Stated Body Dimensions And Placement

Kasa EP40 Outdoor Smart Plug

TP-Link lists 4.3 × 1.5 × 3.2 in (110 × 39 × 81 mm) and labels the order H × W × D.[1]

Kasa KP401 Outdoor Smart Plug

TP-Link lists 3.1 × 2.8 × 1.5 in (80 × 70 × 38.5 mm) but does not label the axis order on the KP401 datasheet.[4]

What this changes: Compare the published dimensions with the actual clearance around your outdoor receptacle. The largest listed number is 110 mm for EP40 and 80 mm for KP401, but that screening comparison does not identify the KP401 axes or guarantee that either body, cable, or cover will fit a particular installation.[1, 4]

The better fit depends on your priorities

Best for your routine

One smart plug needs to connect two outdoor devices that you may operate separately.

Best fit: Kasa EP40 Outdoor Smart Plug

Based on listed features, not comparative testing.

TP-Link documents two EP40 outlets that can be used together or individually; the KP401 US V1 guide depicts one Smart Outlet. The KP401 datasheet’s plural wording is noted as a documentation conflict, so confirm the matching hardware guide if revision identity is uncertain.

View Kasa EP40 Outdoor Smart Plug on AmazonPaid link

One outdoor device is enough at the plug.

The better fit depends on your priorities

One outlet is enough for this setup, but that does not favor KP401: EP40 can also serve a single device, and the documented outlet count provides no reason to choose one over the other here. Compare other requirements and current offers.

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

No matched price comparison is included. If current offers differ, a higher price would need to make sense for your setup; the clearest documented distinction here is whether two outlets are useful to you.

Price history was not assessed, so this comparison makes no purchase-timing recommendation.

Limitations

  • The KP401 US V1 guide’s appearance page labels and depicts one Smart Outlet, while its separate datasheet uses generic plural wording about “each outlet.” This comparison follows the exact-model guide diagram for the one-outlet description; check the guide matching your hardware version if that distinction is decisive.
  • TP-Link labels the EP40 dimension order H × W × D. The KP401 datasheet gives a three-number dimension line without axis labels, so do not use it to claim width, height, depth, or a guaranteed fit for a specific cover or receptacle.
  • The listed dimensions describe the plugs, not clearance around a particular outdoor receptacle, cable path, or cover. Measure the installation space and verify fit before buying.
  • No hands-on or controlled test was performed. This page compares published configuration and dimension information, not smart-control reliability, wireless range, weather performance, safety, or electrical-load suitability.
  • No price-history analysis or purchase-timing recommendation is included.

Questions shoppers ask

Does the KP401 have one outlet or two?

The KP401 US V1 guide’s appearance page labels one “Smart Outlet” and depicts one receptacle. Its separate datasheet has generic plural wording, so use the guide that matches your hardware revision if outlet count is critical.

Will either plug fit behind my outdoor receptacle cover?

The published dimensions are a starting point, not a fit guarantee. EP40 dimensions are labeled H × W × D; the KP401 datasheet does not label the axis order. Measure your available clearance and confirm the KP401 orientation and cover clearance before ordering.

Methodology and sources

Compared outlet configuration using TP-Link’s EP40 product statement and the KP401 US V1 guide’s exact-model appearance diagram, while retaining the separate KP401 datasheet’s plural wording as a conflict. Compared only the published dimension lines and their axis-label scope; no installation fit or real-world performance was inferred.

AI assisted source research, comparison drafting, and consistency checking. Neither plug was physically inspected or hands-on tested.

View 4 sources
  1. 1.EP40 | Kasa Smart Wi-Fi Outdoor Plug | TP-LinkTP-Link · Official specifications · Source checked 2026-10-15 21:44 UTC
    Evidence used on this page
    • Product features, “Double The Outlets”; Specifications > General > Package Content and Dimensions (H × W × D).: The US EP40 page states that one plug can serve two outdoor devices together or individually. It lists a plug with 6-inch cable and dimensions 4.3 × 1.5 × 3.2 in (110 × 39 × 81 mm), explicitly in H × W × D order.
  2. 2.KP401 | Kasa Smart WiFi Outdoor Plug | TP-LinkTP-Link · Official specifications · Source checked 2026-10-15 21:44 UTC
    Evidence used on this page
    • Page heading and model label KP401.: The US product page identifies the product as Kasa Smart WiFi Outdoor Plug, model KP401. Its page notes that the product is being developed and pictures are design sketches for reference; its images are not used to determine outlet count.
  3. 3.KP401(US)_V1_User GuideTP-Link · Official specifications · Source checked 2026-10-15 21:44 UTC
    Evidence used on this page
    • Physical page 5 / printed page 3, “Appearance”: one diagram callout labelled “Smart Outlet,” one receptacle shown, and one “Control Button”; opening page identifies KP401 and US V1 guide.: The TP-Link US V1 guide identifies KP401 and depicts one receptacle labelled “Smart Outlet.” Its accompanying text says the single control button turns the plug-in device on or off. This exact-model guide is the basis for the one-outlet reading; the separate datasheet conflict is disclosed.
  4. 4.KP401 | Kasa Smart Wi-Fi Outdoor Plug (US V1 Datasheet)TP-Link · Official specifications · Source checked 2026-10-15 21:44 UTC
    Evidence used on this page
    • Page 4 (printed “Features”): generic plural phrases “each outlet” and “each device connected to the plug”; page 5 (“General”): dimensions 3.1 × 2.8 × 1.5 in (80 × 70 × 38.5 mm), with no axis order stated.: The datasheet identifies KP401 US V1 and lists the dimension triple without axis labels. Its generic plural outlet/device wording is retained as a documentation conflict and is not used to claim the KP401 has two outlets.

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