Our take
Sharp R-431ZS is a stainless countertop Carousel with a documented 1.3-cu.-ft. cavity and 1,000 W microwave output. Its owner manual lists 1,400 W input separately, while the exact-model retailer record adds a 12.8-in. turntable and a concrete set of automatic and one-touch controls. That makes its cavity and rotating surface larger than the 1.1-cu.-ft. Sharp R-309YV packet already in this shortlist, although both models are listed at 1,000 W output. The evidence does not show that R-431ZS uses sensor cooking or supports an optional trim kit, so those fields remain unconfirmed. The historical candidate ASIN B008RBM0V6 was not verified as an exact current listing; the shopping route searches by model and carries the affiliate tag. This is a source-based comparison, not a personal cooking test or a claim about current price, stock, or buyer-review results.
A countertop shortlist option when a 1.3-cu.-ft. cavity, 1,000 W stated output, and larger documented Carousel turntable matter; compare the countertop footprint and verify the exact model on any offer..
Choose another model if you need confirmed humidity-sensor cooking, a manufacturer-documented trim-kit installation, a verified direct Amazon ASIN, or an explicitly classified foodservice microwave.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The exact owner manual identifies R-431ZS and states 1.3 cu. ft., 1,000 W microwave output, and a separate 1,400 W input rating.
- Lowe's exact-model record lists a 12.8-in. Carousel turntable and stainless finish, giving a useful dimensional comparison point for dishes.
- The documented controls include five auto-cook programs, four one-touch programs, time and weight defrost, a clock, and minute-plus/30-second controls.
What to weigh up
- The sources reviewed do not establish sensor cooking; preset cooking functions alone do not prove that a sensor measures food moisture.
- No exact-model optional trim kit or explicit commercial/foodservice duty classification was found, so installation and duty filters should treat both as unknown.
- The historical ASIN is not verified for this model, and the listed retailer says it no longer sells the item; the tagged destination is a model search, not proof of present availability.
The key details
| Model covered | R-431ZS |
|---|---|
| Capacity | 1.3 cu. ft.; the Sharp owner manual identifies model R-431ZS. |
| Microwave output | 1,000 W microwave energy output; the owner manual lists 1,400 W input separately. |
| Cooking approach | Five auto-cook programs, four one-touch programs, time/weight defrost, clock, and minute-plus/30-second controls; sensor cooking is unconfirmed. |
| Installation options | The owner manual gives countertop installation instructions; no R-431ZS trim-kit option is confirmed. |
| Finish and turntable | The exact-model Lowe's record lists a stainless finish and 12.8-in. Carousel turntable. |
Performance figures are manufacturer claims. Source checked October 4, 2026. Regional models and included accessories can differ.
What the features mean for you
Keep the R-431ZS identity separate from nearby Sharp models
The Sharp owner-manual cover names R-431ZS, and Lowe's exact-model record also gives R-431ZS while describing a stainless countertop microwave. That is enough to verify a real microwave model and distinguish it from the previously reviewed R-309YV, whose model code and listed capacity differ. It does not verify that the frozen historical ASIN B008RBM0V6 still resolves to this exact variant. For that reason the profile keeps the historical ASIN as an unresolved clue and directs shoppers to a tagged search for the exact R-431ZS code. Check the model plate and full suffix on an offer before relying on its finish or dimensions.
Use output and electrical input as separate numbers
The R-431ZS manual states a 1.3-cu.-ft. cavity and 1,000 W of microwave energy output. It lists 1,400 W input in a separate line. Compare the 1,000-W output with other stated cooking-output ratings; the input figure describes the electrical rating and should not be substituted for output. The model is documented for a standard 120-V, 60-Hz supply in the manual. These ratings help with a like-for-like specification check but do not predict the time a particular food or container will need.
Preset cooking is not the same claim as sensor cooking
The exact-model retailer record lists five auto-cook programs, four one-touch programs, time and weight defrost, a digital clock/timer, and minute-plus and 30-second controls. The manual also documents the model's operating controls and auto-cook functions. These are useful distinctions for people who want shortcut choices in addition to entering a time and power setting. The reviewed sources do not describe humidity-based sensor cooking for R-431ZS. Because auto menus can exist without a moisture sensor, sensorCooking stays null rather than being marked true or false by inference.
Measure dishes against the 12.8-inch rotating surface
Lowe's exact-model specifications list a 12.8-inch Carousel turntable. That is a useful way to compare this model with smaller rotating trays, including the 11.25-inch tray documented for Sharp R-309YV. A nominal diameter is not a promise that every platter fits: account for the dish's widest point, the cavity walls, and room for rotation. The retailer also identifies a 1.3-cu.-ft. cavity and stainless finish. Treat those as sourced dimensions and finish information, not as a claim about cooking results or the condition of a particular used or renewed item.
Plan for countertop placement and verify built-in requirements
The owner manual includes a countertop installation guide with ventilation and clearance instructions. Follow the exact manual when selecting a counter location rather than assuming that an oven with a flat exterior can sit inside any cabinet opening. The evidence reviewed here does not name an R-431ZS trim kit or authorize built-in use with a kit, so trimKitCompatible remains null. The same documents do not expressly label this exact model household-only or commercial/foodservice equipment. Its commercialDuty tag therefore also stays null; a commercial kitchen should confirm duty classification and electrical requirements with the manufacturer before selecting it.
Treat the historical offer and current search as different evidence
B008RBM0V6 is the ASIN in the frozen source record, but the review did not verify a current exact listing tied to R-431ZS. This packet consequently does not use a direct ASIN link or imply that the product is currently stocked. Its Amazon destination searches the exact model code and includes buyershortlists-20. Check the offered unit's model label, condition, finish, and seller details before purchase. The Lowe's page used for product dimensions states that Lowe's no longer sells the item, so it is retained as specification evidence rather than an availability claim.
What else to compare
Sharp R-309YV is a more compact 1.1-cu.-ft. alternative with the same stated 1,000 W output and an 11.25-in. turntable. R-431ZS offers a documented 1.3-cu.-ft. cavity and 12.8-in. tray. The existing GE Profile PEM31DFWW profile documents humidity-sensor cooking and optional trim kits but has a smaller 1.1-cu.-ft. cavity and 800 W output. Compare tray size, installation needs, and exact suffix rather than assuming all three Sharp/GE feature sets overlap.
Before you buy
What are the capacity and microwave output?
The R-431ZS manual states 1.3 cu. ft. and 1,000 W microwave energy output; it lists 1,400 W input separately.
How large is the turntable?
Lowe's exact-model R-431ZS record lists a 12.8-in. Carousel turntable. Measure your dish and allow room for it to rotate.
Do its auto-cook programs confirm sensor cooking?
No. Five auto-cook programs are listed, but the reviewed exact-model sources do not document a humidity sensor, so that feature remains unconfirmed.
Does ASIN B008RBM0V6 prove the current listing is R-431ZS?
No exact current ASIN mapping was established. The affiliate link searches Amazon for the R-431ZS model code and carries the required tag.
Can I install R-431ZS in a cabinet with a trim kit?
The owner manual gives countertop installation instructions, but no exact R-431ZS trim kit was confirmed in the reviewed sources. Do not assume built-in compatibility.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Sharp R-431ZS owner manual hosted by ManualsLib ↗ — checked October 4, 2026.
- Sharp R-431ZS owner manual: exact model cover, 1.3-cu.-ft. capacity, 1,000-W output and separate 1,400-W input, controls, and countertop installation guide ↗ — checked October 4, 2026.
- Lowe's exact-model R-431ZS record: stainless finish, 12.8-in. turntable, capacity, output, and listed control programs ↗ — checked October 4, 2026.
- Historical Amazon ASIN reference; exact current product identity was not established ↗Paid link · We may earn a commission. — checked October 4, 2026.
The decision
R-431ZS belongs on a countertop shortlist when its 1.3-cu.-ft. cavity, 1,000-W output, stainless finish, and documented 12.8-in. Carousel tray fit the space and cookware. Its auto-cook and one-touch programs add useful control choices, but sensor cooking and trim-kit compatibility remain unconfirmed. Verify the exact model and offer details; historical ASIN B008RBM0V6 was not proven to identify a current exact listing.
Is it the right fit?
Check the exact model and today’s offers on Amazon.