WattStopper CI-355 PIR Ceiling...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$247.17
$130.35
WattStopper CI-355 PIR Ceiling Occupancy Sensor 100-347VAC, Ceiling Mount 360°

WattStopper CI-355 PIR Ceiling Occupancy Sensor 100-347VAC 360� Detection with Walk-Through Mode

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Model: CI-355
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$247.17
$130.35
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WattStopper CI-355 PIR Ceiling Occupancy Sensor 100-347VAC 360� Detection with Walk-Through Mode

Advanced PIR Detection Technology for Professional Lighting Control

The WattStopper CI-355 PIR Ceiling Occupancy Sensor delivers reliable 360� detection coverage with 100-347VAC compatibility for versatile commercial and residential lighting control applications. This ceiling-mount sensor features advanced Detection Signature Processing technology and walk-through mode functionality for optimal energy management and user convenience.

Professional Features & Benefits

  • 100-347VAC Voltage Range: Wide voltage compatibility ensures installation flexibility across diverse electrical systems and applications.
  • 360� PIR Detection: Complete circular coverage eliminates blind spots and provides comprehensive occupancy monitoring for maximum lighting efficiency.
  • Walk-Through Mode: Automatically turns lights off after 3 minutes for brief visits, optimizing energy savings during short-duration occupancy like mail delivery.
  • Detection Signature Processing: Advanced signal processing eliminates false triggers while providing immunity to RFI and EMI interference for reliable operation.
  • Zero-Crossing Technology: Extends relay life through optimized switching timing, reducing maintenance requirements and ensuring long-term reliability.
  • Built-in Light Level Sensor: Integrated photocell with simple one-step setup prevents unnecessary lighting activation during adequate daylight conditions.
  • LED Occupancy Indicator: Visual confirmation of detection status simplifies troubleshooting and system verification during installation and maintenance.

Technical Specifications

  • Country Of Origin: China
  • Product Depth Us: 4.75 in
  • Product Environmental Profile: Yes
  • Product Height Us: 3.0 in
  • Product Volume Us: 67.68 cu in
  • Product Weight Us: 0.54 lb
  • Product Width Us: 4.0 in

Professional Applications

  • Commercial Office Buildings
  • Retail Establishments
  • Educational Facilities
  • Healthcare Facilities
  • Residential Properties
  • Warehouse and Storage Areas
  • Conference Rooms and Meeting Spaces

Why Choose WattStopper Quality?

WattStopper delivers proven reliability through advanced PIR detection technology, robust 100-347VAC electrical compatibility, and professional-grade construction. The clip mounting system and DIP switch configuration ensure straightforward installation and adjustment, while zero-crossing technology and Detection Signature Processing provide long-term dependable performance for demanding commercial and residential lighting control applications.

Manufacturer Resources

Product Specs

Country Of Origin:
China
Product Depth Us:
4.75 in
Product Environmental Profile:
Yes
Product Height Us:
3.0 in
Product Volume Us:
67.68 cu in
Product Weight Us:
0.54 lb
Product Width Us:
4.0 in

WattStopper CI-355 – Frequently Asked Questions

1) Will a WattStopper CI-355 ceiling occupancy sensor work on a 277V or 347V lighting circuit?
Yes. The CI-355 is a 100-347VAC sensor, so it lands on 120V, 208V, 240V, 277V and 347V circuits without a separate power pack or voltage-specific model. That single wide-range part number is what lets a contractor stock one sensor for a 277V office floor and a 347V Canadian-spec warehouse bay on the same job.
2) Should I use a PIR ceiling sensor or a dual-technology sensor in a private office or restroom?
PIR, which is what the CI-355 is, needs a line of sight to moving body heat. That makes it a good fit for open offices, conference rooms, retail floors and warehouse aisles where the whole space is visible from the ceiling. Where occupants sit still for long stretches, or where partitions, tall shelving or toilet stalls break the view, a PIR-only sensor is the wrong choice and an ultrasonic or dual-tech head is the right one. The 360 degree pattern removes blind spots around the sensor itself, but it cannot see through an obstruction.
3) How much ceiling space do I need to fit a CI-355 occupancy sensor?
The CI-355 measures 4.75 x 4.0 x 3.0 inches and weighs 0.54 lb, and it mounts with a clip system rather than a box-mounted yoke. The 3.0 inch figure is the one to watch in a tight plenum or a shallow hard-lid ceiling; the 4.75 and 4.0 inch footprint is what sits against the tile face.
4) What does walk-through mode do on a WattStopper CI-355, and when would I turn it on?
Walk-through mode shuts the lights off after 3 minutes when someone only passes through the space instead of staying in it, so a mail drop or a quick look into a storage room does not hold the full time delay. It is worth enabling in corridors, copy rooms, and storage or stock areas with a lot of short visits. In a conference room, leave it off so a presenter is not dropped into the dark.
5) Can the CI-355 hold the lights off when there is enough daylight in the room?
Yes. A light level sensor is built into the CI-355, with a one-step setup, so the sensor will not bring the lights on when ambient daylight already covers the space. On a daylit perimeter or a room with skylights that is the feature doing most of the actual energy saving, and it means you do not need a separate photocell in the circuit.
6) How is the CI-355 ceiling sensor adjusted after it is installed?
Settings are made with DIP switches on the sensor, not through software or a handheld programmer, so an electrician sets time delay and mode behavior at the device during trim-out. An LED occupancy indicator flashes on detection, which is how you verify coverage and walk-test the room before you close up the ceiling and how maintenance later confirms the head is still seeing the space.
7) Will a ceiling occupancy sensor false-trigger from HVAC airflow or nearby radios in a healthcare or office space?
The CI-355 uses Detection Signature Processing, which filters the signal to reject false triggers and gives the sensor immunity to RFI and EMI. That is the part that matters in a patient care area, a floor with two-way radios, or a space with a diffuser blowing near the sensor, where a cheaper PIR head cycles the lights for no reason.
8) Is a CI-355 sensor going to survive a space where the lights cycle dozens of times a day?
That is what the zero-crossing switching is for. The internal relay is timed to switch as the AC waveform crosses zero, which cuts the arcing that kills relay contacts and extends relay life in high-cycle spaces like restrooms, corridors and stairwells. For a property manager standardizing a building, it is the difference between a sensor you replace and one you forget about.
9) What is the exact part number to order for the WattStopper 360 degree ceiling PIR sensor?
Order it as WattStopper CI-355. That is the full manufacturer part number for the 360 degree ceiling-mount PIR occupancy sensor with the 100-347VAC input, and there are no finish or voltage suffixes to add, since the wide voltage range is built into the one model.
How fast can I get the WattStopper CI-355 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 WattStopper CI-355 come with a warranty?
Absolutely. The WattStopper CI-355 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 WattStopper CI-355?
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
Why buy the WattStopper CI-355 from ZenSupply?
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