Pass & Seymour UT3551 Wattstop...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$272.01
$222.01
Pass & Seymour UT3551 Wattstopper Ceiling Mount Ultrasonic Occupancy Sensor

Pass & Seymour UT3551 Wattstopper Ceiling Mount Ultrasonic Occupancy Sensor

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Model: UT3551

In Stock (leaves warehouse same day if ordered before 3pm ET)

$272.01
$222.01
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Pass & Seymour UT3551 Wattstopper Ceiling Mount Ultrasonic Occupancy Sensor

The Pass & Seymour UT3551 is a Wattstopper ceiling mount ultrasonic line voltage occupancy sensor rated to cover up to 500 sq ft. Designed for line voltage operation at 120, 230 (single phase), 277 or 347 VAC, 50/60 Hz, this sensor uses omni-directional ultrasonic technology with ultrasonic diffusers to provide comprehensive coverage of open ceiling spaces. Its low-profile design and terminal wiring make it a practical choice for energy-conscious commercial and light industrial lighting control retrofits and new construction.

Key Features

  • Coverage Area: Covers up to 500 sq ft when ceiling mounted, suited for open-plan rooms and common areas.
  • Advanced Ultrasonic Technology: Utilizes advanced, omni-directional ultrasonic sensing for reliable motion detection throughout the coverage zone.
  • Ultrasonic Diffusers: Diffusers provide more comprehensive coverage across the sensing area, reducing blind spots.
  • Terminal Wiring: Terminal wiring connections allow for quick and easy installation on the job site.
  • Walk-Through Mode: Walk-through mode increases energy savings potential by shortening time-out when the space is only briefly occupied.
  • Multi-Voltage Line Voltage Rating: Operates at 120, 230 (single phase), 277 or 347 VAC, 50/60 Hz for flexible application across electrical systems.
  • Low-Profile Appearance: Architecturally appealing low-profile design blends into finished ceilings.

Technical Specifications

  • Country Of Origin: China
  • Product Line: Pass & Seymour

Typical Applications

  • Commercial Office and Common Area Lighting Control
  • Ceiling-Mounted Occupancy Sensing for Open Floor Plans
  • Energy-Efficient Lighting Retrofits
  • New Construction Lighting Control Systems
  • Line Voltage Sensor Installations Requiring Terminal Wiring

Why Pass & Seymour?

Pass & Seymour, part of the Wattstopper line, engineers ceiling occupancy sensors like the UT3551 with advanced ultrasonic sensing and terminal wiring designed for straightforward, reliable installation. The multi-voltage line voltage rating and walk-through mode support energy-conscious, code-compliant performance for professional lighting control projects.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Occupancy Sensor
Voltage Rating:
120/230/277/347 VAC
Configuration:
Ceiling Mount
Country of Origin:
China
Series:
Wattstopper
Department:
Electrical
Product Group:
Wiring Devices

Pass & Seymour UT3551 – Frequently Asked Questions

1) Will the Pass & Seymour UT3551 ceiling sensor work on a 347V lighting circuit?
Yes. The UT3551 is a line voltage sensor rated 120, 230 (single phase), 277 or 347 VAC at 50/60 Hz, so the same part number covers standard 120V commercial branch circuits, 277V lighting, and 347V Canadian systems. No separate power pack or low voltage transformer is part of the sensor itself.
2) How big a room will one UT3551 occupancy sensor cover?
Up to 500 sq ft when ceiling mounted. That sizes it for a private office, a small conference room, a break room, or a section of an open floor plan. For larger open areas you would either add sensors or move to a higher coverage model, such as the Leviton ODS10-ID-E, which we list at 2100 sq ft.
3) Should I use an ultrasonic ceiling sensor or a PIR one?
Ultrasonic, which is what the UT3551 uses, senses motion by reflected sound waves and does not need a clear line of sight, so it picks up small movement and works around partitions, cubicle walls, and restroom stalls. PIR sensors read body heat in a direct line of sight and are less prone to false trips from air movement, which suits open rooms with warehouse traffic or HVAC diffusers nearby. If you want PIR ceiling coverage instead, Leviton's ODC and ODS series are the PIR line voltage equivalents we carry, including the self-adaptive ODS15-IDW.
4) Does the UT3551 need a separate power pack to wire it up?
No. It's a line voltage sensor with terminal wiring connections, so the branch circuit and the switched load land directly on the sensor's terminals. That is different from low voltage sensor systems, where the head runs on class 2 wiring back to a power pack that carries the load.
5) What is the difference between the Pass & Seymour UT3551 and a Leviton ODS10-ID ceiling occupancy sensor?
The sensing technology is the main split. The Pass & Seymour UT3551 is a ceiling mount ultrasonic sensor that uses omni-directional ultrasonic sensing with diffusers, so it detects the air-pressure disturbance of movement and does not need an unobstructed line of sight to the occupant. The Leviton ODS10-ID is a PIR commercial grade occupancy sensor, which detects body heat moving across its field of view and does need line of sight. Both are line voltage devices - the UT3551 runs 120/230/277/347 VAC and the ODS10-ID is rated 120/277V AC. For restrooms with stalls, partitioned offices, or spaces with tall storage, the ultrasonic UT3551 is the one that sees around obstructions; for a wide open warehouse aisle or lobby with clear sightlines, PIR is the conventional choice.
6) I need to cover a room much larger than 500 square feet with one ceiling sensor - what should I use instead of the UT3551?
The Pass & Seymour UT3551 is rated to cover up to 500 sq ft when ceiling mounted, which suits a single open-plan room, conference room, or common area. For a substantially larger footprint from one device, the Leviton ODS10-ID-E is a PIR commercial grade occupancy sensor rated for 2100 sq ft at 120/277V in a black finish. Note that you are changing sensing technology when you make that swap - the Leviton is passive infrared and wants line of sight across the space, so it works best in a large open room without tall partitions or racking. If the large space is broken up by obstructions, multiple UT3551 units zoned across the ceiling keeps the ultrasonic coverage pattern that handles blind spots.
7) Our building runs 347V lighting circuits - which ceiling occupancy sensor works on that?
The Pass & Seymour UT3551 is the one to specify. It is rated 120/230/277/347 VAC, 50/60 Hz, so a single part number covers 347V Canadian-style lighting branch circuits along with standard 120V and 277V feeds. The Leviton PIR comparables are narrower on this point - the ODS10-ID and ODS10-ID-E are 120/277V AC devices. If you are standardizing sensors across a portfolio that mixes 277V and 347V floors, the UT3551 lets you stock one SKU instead of splitting the order by voltage.
8) What is walk-through mode on this Wattstopper ceiling sensor and when would I use it?
Walk-through mode shortens the time-out when someone only passes briefly through the space, so the lights drop back off quickly instead of running a full delay. It is worth enabling in transition spaces, copy rooms, storage areas, and corridors off an open plan where occupancy is short and intermittent, and it is one of the ways the UT3551 helps a project hit its energy budget.
9) Can I drop a UT3551 into a ceiling on a retrofit, or is it new construction only?
Both. The description calls out retrofits and new construction for commercial and light industrial lighting control. Because it takes line voltage on terminals, a retrofit works well where there is already a switch leg and neutral available at the ceiling location; if your existing control is a wall switch with no ceiling feed, plan the wiring accordingly before you order.
10) Will an ultrasonic sensor like the UT3551 miss someone sitting still at a desk?
Less likely than a line-of-sight sensor. Ultrasonic sensing reads reflected sound off any movement in the room, so minor motion like typing or shifting in a chair is detected, and the omni-directional pattern plus ultrasonic diffusers cut the blind spots across the coverage zone. That is the usual reason to specify ultrasonic over PIR for private offices and partitioned areas.
11) Is the Leviton ODS15-IDW a direct replacement for the Pass & Seymour UT3551?
Not a direct one-for-one. The Leviton ODS15-IDW is a PIR self-adaptive commercial grade occupancy sensor - self-adaptive meaning it adjusts its time delay and sensitivity based on occupancy patterns rather than holding a fixed setting. The Pass & Seymour UT3551 is ultrasonic and offers walk-through mode, which shortens the time-out when a space is only briefly occupied. Both are commercial line voltage ceiling devices and both address the same code-driven automatic shutoff requirement, but you are swapping infrared detection for ultrasonic detection, so verify the room does not depend on seeing around partitions before substituting. The UT3551 also carries a wider voltage window at 120/230/277/347 VAC, which matters on 347V systems.
12) What looks like a substitute for the UT3551 but is not the same thing?
Watch the mounting and the technology together. The Leviton ODC0S-I1W is a PIR commercial grade line voltage occupancy sensor - it shares the commercial grade and line voltage description with the Pass & Seymour UT3551, so it reads as interchangeable on a purchase order, but it is passive infrared rather than the omni-directional ultrasonic sensing with diffusers that the UT3551 uses. Ultrasonic picks up minor motion and movement behind obstructions; PIR needs a clear heat signature crossing its lens. If the original design called out ultrasonic for a restroom, a partitioned open office, or a room with columns, dropping in a PIR unit will produce false-off complaints even though the electrical connection is identical.
13) Is the UT3551 discreet enough for a finished office ceiling?
It uses a low-profile housing intended to blend into finished ceilings rather than sit proud of the tile, which is why it gets specified in offices and common areas rather than only back-of-house spaces.
How fast can I get the Pass & Seymour UT3551 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Pass & Seymour UT3551 come with a warranty?
Absolutely. The Pass & Seymour UT3551 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Pass & Seymour UT3551?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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