CMRB 6 High Bay PIR Occupancy Sensor - Reliable High-Height Detection

In this review the CMRB 6 High Bay is evaluated for its use in tall spaces where reliable automatic lighting control is needed. The bottom line: installers and facility managers who need a self-contained, line-voltage motion sensor that mounts with a high bay fixture will appreciate its straightforward operation and wide coverage; the single biggest reason to buy is the sensor's ability to switch loads directly at up to 45 ft mounting height, avoiding external power packs. The reviewer found setup clear and the sensing range effective for typical warehouse bays and large garages.

Key Features

• PIR occupancy detection: Passive Infrared sensing delivers reliable motion-based switching suited to high bay fixtures without false activation from wiring noise.
• Self-contained relay: The internal relay switches line voltage directly so there is no separate power pack required for operation.
• Compatible with many lamps: Works with electronic and magnetic ballasts, CFLs, LEDs, and incandescent loads so it fits diverse lighting types in commercial spaces.
• 277V-capable: Accepts 277V standard installations, making it appropriate for commercial and industrial electrical systems.
• No minimum load: Operation without a minimum load requirement simplifies pairing with modern low-wattage LED fixtures.
• Push-button programmable: Simple on-unit programming and interchangeable hot and load wires ease installation and configuration.

Who It's For

The CMRB 6 High Bay is aimed at electricians, maintenance crews, and facility managers who need a compact, on-fixture occupancy sensor for warehouses, gymnasiums, workshops, or large garages. Its design for mounting up to 45 ft and a 15-20 ft radial overlap makes it particularly useful where fixtures illuminate broad floor areas and centralized detection is preferred.

It is less appropriate for applications that require multi-technology detection (such as combined ultrasonic or microwave) or very fine-grained zoning control; projects needing integrated networked lighting controls or advanced scheduling may be better served by a dedicated control system.

Pros & Cons

Pros

• Reliable motion detection over a wide area due to the 360o PIR pattern useful at high mounting heights.
• Simple installation with interchangeable hot and load wires and push-button programming reduces electrician time on site.
• Broad lamp compatibility and no minimum load requirement make it versatile with modern LED fixtures and older ballast types.
• Built-in relay and 277V support mean fewer external components in commercial installations.

Cons

• Programming options are basic; some users reported mixed impressions about configuration flexibility compared with advanced sensors.
• Limited to PIR detection, so it may miss very small or slow movements compared with multi-technology sensors.

Specifications

Mounting height	Up to 45 ft
Coverage pattern	15-20 ft radial overlap, 360o
Sensing technology	Passive Infrared (PIR)
Voltage	Accepts 277V standard
Load compatibility	Electronic & magnetic ballasts, CFLs, LED, incandescent
Minimum load	No minimum load requirement
Controls	Self-contained relay, push-button programmable

Our Verdict

The CMRB 6 High Bay is a practical, good-value choice for commercial and industrial sites that need a dependable on-fixture occupancy sensor. It delivers straightforward installation, solid PIR detection at high mounts, and broad lamp compatibility, making it ideal for retrofits and new installs where simple automatic switching is the priority.

Frequently Asked Questions

Can this sensor work with LED fixtures?
Yes. It is compatible with LED loads and has no minimum load requirement, so it pairs well with modern low-wattage fixtures.

What mounting height is recommended?
Designed for mounting heights up to 45 ft, with a 15-20 ft radial coverage pattern that overlaps typical high bay lighting areas.

Does it require a separate power pack?
No. The unit includes a self-contained relay and switches line voltage directly, so no external power pack is needed.