Our take
The Kenmore 6633 / 721.66339 is a medium-size countertop microwave whose manual documents TrueCookPlus and quick-touch sensor controls. It combines a 1.2-cu.-ft. cavity with 1,200-W output; a 1,650-W input rating and exact supply details matter for installation.
A candidate for households that want a documented sensor and TrueCookPlus control set in a medium cavity. Compare another model if a measured tray size or verified trim-kit route is essential..
Do not choose it when an exact turntable diameter, confirmed trim-kit combination, verified finish or direct historical-ASIN match is a purchase requirement.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The use-and-care guide identifies the 6633 model and describes countertop placement and a 1.2-cu.-ft. cavity.
- Quick-touch sensor functions and TrueCookPlus are documented controls, not inferred from the brand name.
- A service manual distinguishes 1,200-W microwave output from 1,650-W electrical consumption.
What to weigh up
- The reviewed records do not establish the numeric turntable diameter or a current exact Amazon listing.
- The model's finish and exact compatible trim-kit pairing are not confirmed.
- The 1,650-W input figure is important for circuit planning and should not be confused with output.
The key details
| Model covered | 6633 / 721.66339 |
|---|---|
| Capacity | Capacity: 1.2 cu. ft.; the exact guide does not provide a usable cavity measurement beyond nominal capacity |
| Microwave output | Microwave output: 1,200 W; rated electrical consumption is separately listed as 1,650 W |
| Cooking approach | Cooking approach: TrueCookPlus, quick-touch sensor functions, timed cooking, defrost and programmable stages |
| Installation options | Installation options: countertop placement and 120 V / 60 Hz supply are documented; exact trim-kit and commercial-duty status are unknown |
| Finish and turntable | Finish and turntable: turntable is included; exact diameter and exterior finish are not established by the reviewed records |
Performance figures are manufacturer claims. Source checked October 10, 2026. Regional models and included accessories can differ.
What the features mean for you
Confirm the 6633 and 721.66339 model relationship
The use-and-care guide identifies the Kenmore 6633, and the service document names model 721.66339 and its 721.66339800 service code. Those references support one exact model identity. They do not make every Kenmore product with a 721 prefix the same appliance. Keep this record separate from the 20-7212X series and other Kenmore numeric codes unless a model-specific document proves equivalence. The historic Amazon record is only an identity clue; the tagged search keeps the complete 6633 / 721.66339 wording visible for manual comparison.
Treat 1.2 cubic feet as a starting point for dish fit
The guide lists a 1.2-cu.-ft. oven, but the reviewed evidence does not give a numeric turntable diameter for this retail model. Capacity alone cannot tell you whether a wide dinner plate or casserole will rotate freely. Measure the appliance opening and compare your cookware with the actual glass tray and cavity dimensions in the unit's own manual. If a known tray size is central to your choice, a sourced model with a stated diameter is easier to screen. The Kenmore remains a medium-cavity option, not a promise about every dish.
Use the named automatic controls for the jobs they cover
The user guide documents TrueCookPlus as a programmed cooking approach and lists quick-touch sensor operation, including cooking and reheating routines. That can reduce manual time and power entry for supported menu choices, while the unit also allows timed cooking, power adjustment and defrost. These functions do not mean every recipe is sensed automatically, and the service life or availability of any external TrueCookPlus service is not asserted here. A buyer who prefers a plain timer can still use manual controls; a buyer who requires confirmed sensor guidance has a stronger documented case for this model than for one-touch-only alternatives.
Separate cooking output from electrical draw
The service manual gives a maximum microwave output of 1,200 W and rated electrical consumption of 1,650 W. These values describe different parts of the appliance: output is the microwave cooking rating, while input is relevant to the supply and circuit. The same service document specifies 120 V AC at 60 Hz. Check the rating plate and installation instructions for the individual unit, because its circuit, grounding and clearance requirements matter beyond voltage and frequency. Do not use the 1,200-W output figure as an estimate of wall draw.
Keep finish and built-in compatibility unconfirmed
The saved exact model research does not establish an exterior finish or a precise tray diameter, and it does not document a model-specific trim-kit pairing. The use-and-care guide supports countertop placement, so this belongs in a counter shortlist. That is not evidence for setting it inside a cabinet or combining it with a kit intended for a similarly numbered Kenmore oven. If a trim installation or color match matters, ask for documentation naming 6633 / 721.66339 and inspect the rating label before purchase. The exact foodservice-duty classification also remains unverified.
What else to compare
Before you buy
What model number is the Kenmore 6633?
The use-and-care guide identifies 6633, and the service manual identifies model 721.66339 / 721.66339800.
How much microwave output does it have?
The service manual lists a maximum microwave output of 1,200 W and separately lists 1,650 W electrical consumption.
Does it include sensor controls?
The use-and-care guide describes TrueCookPlus and quick-touch sensor functions for the 721.66339 model.
Can I use it in a cabinet trim kit?
The reviewed exact-model documents support countertop placement but do not confirm a specific compatible trim kit.
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.
- Kenmore 721.66339 use-and-care guide ↗ — checked October 10, 2026.
- Kenmore 721.66339 use-and-care guide, inspected 2026-10-10. The exact 6633/721.66339 document describes countertop placement, capacity, TrueCookPlus and quick-touch sensor functions. ↗ — checked October 10, 2026.
- Sears service manual for Kenmore 721.66339, inspected 2026-10-10. It identifies 721.66339/721.66339800 and lists 120-V/60-Hz supply, 1,650-W input and 1,200-W maximum output. ↗ — checked October 10, 2026.
The decision
The Kenmore 6633 / 721.66339 is a medium-size countertop microwave whose manual documents TrueCookPlus and quick-touch sensor controls. It combines a 1.2-cu.-ft. cavity with 1,200-W output; a 1,650-W input rating and exact supply details matter for installation.
Is it the right fit?
Check the exact model and today’s offers on Amazon.