Chamberlain B4643ST

Overview

The Chamberlain B4643ST is a 3/4 HP DC belt drive opener that adds an integrated camera to a quiet, mid-range platform. The camera sits inside the motor head unit and streams a live view of the garage interior directly through the myQ app. Homeowners can see the full garage from a phone without needing a separate camera device or a second app.

The B4643ST sits in the mid-range of Chamberlain's belt drive lineup. The 3/4 HP motor handles most standard residential doors, and the DC platform delivers the smooth, quiet operation that makes belt drives popular in attached garages. No battery backup is included, which keeps the price accessible for homeowners who do not need outage protection. The camera is what sets this model apart from others at a similar price tier.

The integrated camera appeals to homeowners who use the garage frequently throughout the day. Whether the goal is checking on deliveries, verifying the door is closed, or seeing who is coming and going, the camera puts that information directly in the myQ app alongside the door controls.

Drive Type, Motor, and Power

Belt drive operation uses a reinforced belt on the rail to move the trolley. Compared to chain drive, belt drive produces less noise and vibration, which is the key reason homeowners with attached garages select it. Rooms above or beside the garage benefit from quieter cycling every time the door operates.

The 3/4 HP DC motor is a practical size for the majority of residential two-car doors. DC motors are more energy-efficient than AC alternatives and allow the electronic speed management that produces soft-start and soft-stop behavior. The door slides into motion gradually and slows before reaching fully open or closed. This protects both the opener and the door hardware from the mechanical stress of sudden starts and stops, which adds up over thousands of cycles.

The B4643ST does not include battery backup. If power outage protection is a priority, a different model in the Chamberlain lineup is a better fit. The B4613T is a belt drive alternative with battery backup in a comparable HP range. The manual emergency release cord allows the door to be operated by hand in an outage.

Smart Features, Security, and Safety

The built-in camera is the defining feature of the B4643ST. Integrated directly into the motor head, the camera streams live video to the myQ app. Homeowners can check the garage in real time from anywhere a phone has a signal. The camera supports motion-based activity alerts, so the app notifies the homeowner when activity is detected inside the garage even when they are not actively watching.

Built-in Wi-Fi connects the opener to myQ without a separate hub or bridge. The myQ app provides remote open and close control, door status, activity history, and the live camera feed all in one place. Both monitoring and access control use the same app, which simplifies daily use.

Security+ 2.0 rolling code technology encrypts each remote signal with a unique code. A code-grabbing device that captures an old signal cannot use it to open the door because the code changes after every use. The system is compatible with all Security+ 2.0 accessories, including wireless keypads and additional remotes.

UL 325-compliant photo-eye sensors ship with the unit and mount at the base of the door frame. Any object breaking the beam during closing triggers an automatic reversal. Auto-reverse also activates if the door contacts a physical obstruction during travel. The motor head includes an integrated LED light that activates during each operation cycle.

Feature	Detail
Drive type	Belt
Motor power	3/4 HP
Motor type	DC
Battery backup	No
myQ Wi-Fi	Yes (built-in)
Integrated camera	Yes
Security+ 2.0	Yes
Motor warranty	Lifetime
Belt warranty	Lifetime
Parts warranty	5 Years
Accessory warranty	1 Year
Camera warranty	1 Year
Integrated LED warranty	5 Years

Specifications at a Glance

All specifications are sourced from Chamberlain's published product documentation for the B4643ST, also documented as the B4643T. Warranty terms reflect Chamberlain's stated coverage for this model. The lifetime motor and belt warranties are confirmed for this unit.

Is This the Right Opener for You, and How G Brothers Helps

The B4643ST fits homeowners who want quiet belt drive performance and built-in visual access to the garage without a separate camera system. The integrated camera adds genuine utility. Parents can check whether a teenager made it home safely. Package deliveries that go into the garage can be monitored. The garage interior is visible from anywhere, which is a practical tool in daily household management.

The 5-year parts warranty is stronger than what entry-level openers typically carry. Combined with lifetime coverage on the motor and belt, this model is a solid long-term investment for a homeowner who values warranty depth.

The B4643ST is not the right fit for homeowners who need battery backup, or those with very large or heavy doors that would benefit from more than 3/4 HP.

The myQ app keeps the camera feed and door controls in one place. There is no need to switch between apps. Opening the door and checking the camera view happen in the same interface. This makes the experience straightforward for any household member who uses the app.

The myQ activity log records every door event. It shows the time and the triggering device. Combined with the live camera feed, this gives homeowners a complete picture of garage activity without any additional hardware or subscriptions beyond the opener itself. Push notifications arrive in real time. Homeowners stay aware of garage activity throughout the day. For those needs, the B6755T combines a 1-1/4 HP motor, an integrated camera, and battery backup in one unit.

For homeowners who want the camera feature but also need outage protection, comparing the B4643ST to the B4655T is worth the time. The B4655T adds battery backup to a similar feature set.

The camera is integrated at the factory. It does not require separate mounting or a separate power connection. It is activated during the myQ setup process. After setup, the camera view is available in the myQ app any time. Homeowners do not need to manage a second app or a second login. The camera feed and the door controls are in the same place.

Wireless keypads are a useful accessory to pair with the B4643ST. A keypad on the exterior wall allows PIN-based entry without a remote. Additional remotes can be programmed for extra vehicles. All accessories use Security+ 2.0 and pair during the initial installation.

G Brothers installs and services the Chamberlain B4643ST throughout the Denver metro. The installation includes full rail and motor unit setup, photo-eye sensor alignment, travel calibration, remote and keypad programming, and myQ camera setup. A G Brothers technician walks through the app connection so the live camera view is active before they leave the job site. Door balance is verified during setup. This keeps the motor working within its design range and helps the door seal properly at the bottom. Service areas include Littleton, Highlands Ranch, Parker, and the south metro.