Craftmade 6621 600 watt dimmer light
Description
The Craftmade CM-6621-PW is a 600 watt single-pole dimmer switch sold as a companion accessory for Craftmade ceiling fan light kits. Under the Craftmade model designation it is built on the Leviton SureSlide 6621-PW mechanism, a Decora-style slide dimmer that has been a reliable workhorse in residential lighting control for many years. Understanding exactly what this dimmer is, what it controls, and what it does not control is the most important thing to get right before purchasing it — because buying the wrong type of control for a ceiling fan installation is one of the most common and easily avoidable mistakes in this product category.
What This Dimmer Actually Controls
The CM-6621-PW is a light dimmer only. It is designed exclusively to control the light kit on a compatible Craftmade ceiling fan — not the fan motor itself. This distinction is critical. A full-range light dimmer of this type must never be connected to a ceiling fan motor in an attempt to regulate fan speed. Using a standard incandescent dimmer to control fan speed will cause the motor to hum audibly, run hot, and eventually sustain damage, because ceiling fan motors require purpose-built solid-state speed controls rather than the voltage-reducing mechanism that light dimmers use. Craftmade’s own installation documentation across its product line explicitly warns against this. If you need wall control over both the light and the fan speed, you need either a dual-function wall control designed specifically for ceiling fans or a remote receiver system — not this dimmer paired with a separate speed control unless your wiring supports independent circuits for the fan and light.
With that important clarification established, the CM-6621-PW performs its intended job — controlling the brightness of an incandescent light kit — reliably and smoothly.
The SureSlide Mechanism
The SureSlide design uses a permanently mounted linear slide control that travels vertically on the face plate. Sliding up increases brightness, sliding down reduces it. The action is smooth and precise, with enough resistance in the slider travel that you can set a brightness level and leave it there without the control drifting from its position over time. This is a meaningful practical advantage over rotary dimmers where vibration or accidental contact can shift the setting more easily.
The PW suffix in the model number indicates the preset version of the SureSlide, which is an important specification. Preset versions include a separate on/off switch that operates independently of the slide position. This means you can dim your lights to a preferred level, click the light off, and when you turn it back on it returns to exactly that same preset brightness level rather than defaulting to full brightness. For a bedroom or living room where you use the same comfortable lighting level most of the time, this is a genuinely useful feature that eliminates the need to re-adjust the slider every time you cycle the light. The preset function is one of the main practical reasons to choose the PW version over the standard non-preset variant.
A built-in radio and television interference filter is included in the design, which suppresses the electrical noise that dimmers can sometimes generate and that older dimmer designs were notorious for introducing as interference into nearby audio and video equipment. In most modern installations this is a background feature you will never think about, but it reflects a level of engineering attention appropriate for a product sold alongside premium ceiling fan hardware.
Specifications and Compatibility
The CM-6621-PW is rated at 600 watts, 120 volts AC, 60Hz, single-pole configuration. The 600 watt rating gives it substantial headroom for most residential ceiling fan light kit applications — a single-light kit with a standard incandescent or halogen bulb draws well under 100 watts, and even a four-lamp candelabra kit at 40 watts per socket comes in at 160 watts total, well below the 600 watt ceiling. In practice this dimmer will never be stressed by a typical ceiling fan light application.
The single-pole designation means this dimmer is designed for installations where the light is controlled from a single location. If your installation requires controlling the light from two wall locations — a room with switches at both the door and another entry point — you would need a different control configuration, as three-way dimmer setups require specifically designed three-way compatible dimmers rather than a single-pole unit.
One compatibility limitation worth stating clearly is that this dimmer is rated for incandescent and halogen loads. The original 6621 SureSlide design was developed for incandescent lighting and is not specifically rated for LED or CFL bulbs. Some LED bulbs will dim acceptably on this control, but others may not dim all the way off, may flicker at low brightness levels, or may hum. If your Craftmade light kit uses LED bulbs — which is increasingly common as integrated LED kits have become the norm — you should verify that the specific LED bulbs you are using are compatible with this dimmer type, or consider a dimmer designed specifically for LED loads. For installations with traditional incandescent or halogen bulbs this is a non-issue and performance will be smooth across the full dimming range.
Physical Design and Installation
The CM-6621-PW fits into a standard single-gang wall box and uses Decora-style styling, meaning it has a flat rectangular face rather than the older toggle or rotary profile. This allows it to coordinate with Leviton’s extensive Decora wallplate lineup and with similar decorator-style outlets and switches that are now the dominant residential standard. The white finish designated by the PW suffix coordinates with white trim in most residential settings. The wallplate is sold separately, which is standard practice for this product category.
The housing is described as slim and compact, which matters in multi-gang installations where space inside the wall box is limited and multiple devices need to share a single enclosure. For a dedicated single-switch location this is less of a concern, but it is a genuine advantage in kitchens, hallways, and other locations where the ceiling fan switch may share a box with other controls.
Installation follows the standard procedure for any single-pole dimmer — turn off the circuit at the breaker, remove the existing switch, connect the two house wires to the dimmer’s lead wires using the provided wire nuts, tuck the connections into the wall box, and attach the wallplate. The low-end trim adjustment feature allows you to calibrate the minimum brightness level at the low end of the slider travel, preventing the bulbs from shutting off prematurely before the slider reaches its lowest position. This is accessed via a small screwdriver adjustment on the device body and is worth spending two minutes on during installation to get the dimming range feeling natural.
Who the CM-6621-PW Is Right For
The Craftmade CM-6621-PW makes the most sense as a companion control for a Craftmade ceiling fan whose light kit uses incandescent or halogen bulbs and is on a dedicated light circuit separate from the fan motor. The preset function makes it genuinely more convenient than a basic non-preset dimmer, the 600 watt rating provides ample headroom for any residential light kit application, and the SureSlide mechanism delivers smooth and reliable dimming performance that has been validated across countless residential installations.
If your ceiling fan light kit uses LED bulbs, verify LED compatibility before purchasing or consider a dimmer designed explicitly for LED loads. If you want wall control over both the fan speed and the light from a single location, this dimmer alone does not accomplish that — you would need a dual-function ceiling fan wall control instead. And if you need control from two locations, a three-way configuration is required. Within its intended application, though, the CM-6621-PW is a solid, reliable, well-engineered light dimmer that does exactly what it promises.