Aqara U200 vs. U400: Different Door and Ecosystem Boundaries
Compare Aqara U200 and U400 by door mechanism, regional path, package, and Matter/Thread prerequisites.
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The U200 and U400 are not interchangeable door-fit options. Aqara documents the U200 as a retrofit lock whose motor operates an existing cylinder or deadbolt. The current US U400 page describes a replacement single-cylinder deadbolt. Start by identifying the door hardware and the exact regional kit; shared Aqara branding or Matter support does not bridge the mechanical difference.
The two installation paths use different door hardware. This comparison is schematic; use the matching regional manual and measurements for an actual door.
Compare the documented door paths
| Model and source boundary | Door mechanism described | Checks before treating it as a candidate |
|---|---|---|
| U200, Europe | Retrofit over a compatible existing cylinder in a European standard mortise lock; Aqara also lists selected Scandinavian cylinders with an Emergency Function | Match the cylinder profile and confirm the Emergency Function. Check the exact manual for cylinder position, key operation, mounting clearance, and door state. The wording does not approve every Euro or Scandinavian cylinder. |
| U200, United States | Retrofit for a single-cylinder deadbolt; the manual lists 60 mm or 70 mm backset | Confirm that the existing lock is the documented single-cylinder type and measure the backset. Do not transfer this US screen to another U200 market package. |
| U400, United States | Replacement single-cylinder deadbolt with a supplied strike | Compare the existing preparation with the current U400 dimensions and use its supplied strike. Aqara says modification may be needed when dimensions differ. The cited US page does not establish a complete international fit matrix. |
The U200 manual says the retrofit installation does not require drilling or modifying the door, but that does not remove the cylinder and clearance conditions. The U400 is a replacement path; a matching deadbolt type alone is not a complete installation verdict. If your profile, handing, dimensions, or package is outside the named instructions, leave the result unknown and ask Aqara or a qualified installer. See the U200 Lite guide for a separate model and product record.
Record the exact package and electronic prerequisites
On Aqara’s US U200 specification page, EL-D02D and EL-D02E are separate product codes with different accessories listed. The page does not prove that either code belongs exclusively to one territory. The current US U400 page lists DL-D06E, DL-D16E, DL-D06D, DL-D16D, DL-D17D, and DL-D15D, with package groupings that vary by included battery and M100 hub. Check the full code and box contents against the live offer; the model-code lookup gives the documented package boundary without treating a code as proof of fit.
Both models have Matter-over-Thread paths, but the ecosystem result remains separate from door fit. Aqara’s U200 manual calls for a 2-in-1 Matter controller and Thread border router to use third-party Matter automation. The U400 US page also requires a Thread-enabled Matter controller for the chosen ecosystem. Confirm the particular controller, app, market, and feature you intend to use. A controller requirement being met does not make an unsupported cylinder or deadbolt fit.
Complete a physical result from the model’s manual and an ecosystem result from the controller and platform requirements. Keep either one marked unknown if its evidence is missing.
For a purchase or installation record, write down model code and package, country page, existing door mechanism, dimensions, supplied parts, required hub or controller, and the source date. Then record three outcomes separately: physical fit, required door operation, and electronic feature support. Use the exact-model checklist and pairwise compatibility method; do not convert an unknown into a family-wide yes.
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