WattStopper BZ-250 Power Pack ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$186.74
$136.74
WattStopper BZ-250 Power Pack, 120-277V, 50/60Hz, 24VDC, 225mA, w/Auto-On/Manual-On

WattStopper BZ-250 Power Pack 120-277V 24VDC 225mA with Auto-On/Manual-On Control

(No reviews yet) Write a Review

Model: BZ-250
Selected Model is

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

$186.74
$136.74
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

WattStopper BZ-250 Power Pack 120-277V 24VDC 225mA with Auto-On/Manual-On Control

Professional Low Voltage Power Supply with Advanced Control Features

The WattStopper BZ-250 Power Pack delivers reliable 24VDC power conversion from 120-277V AC input with 225mA output capacity. This professional-grade power supply features mechanically held latching relay technology with selectable power loss operation and high-efficiency plenum-rated design for versatile commercial and industrial applications.

Professional Features & Benefits

  • 120-277V Input Range: Universal voltage compatibility reduces inventory requirements and simplifies installation across diverse electrical systems.
  • 24VDC 225mA Output: Provides stable low voltage power for control circuits, sensors, and automation devices with consistent performance.
  • Auto-On/Manual-On Operation: Dual operating modes ensure code compliance while providing flexibility for different application requirements.
  • Mechanically Held Latching Relay: Selectable power loss operation (On, Off, or last state) maintains system integrity during power interruptions.
  • Zero Crossing Technology: Enhanced reliability and extended product life through optimized switching characteristics.
  • Plenum-Rated Design: High-efficiency switching power supply suitable for air handling spaces and commercial installations.
  • Hold-On/Hold-Off Inputs: Advanced control capabilities for integration with building automation and lighting control systems.

Technical Specifications

  • Country Of Origin: China
  • Product Depth Us: 3.8 in
  • Product Height Us: 2.7 in
  • Product Volume Us: 46.17 cu in
  • Product Weight Us: 0.5 lb
  • Product Width Us: 4.0 in

Professional Applications

  • Commercial Lighting Control Systems
  • Building Automation Integration
  • HVAC Control Circuits
  • Security System Power Supply
  • Industrial Control Applications
  • Educational Facilities
  • Healthcare Environments

Why Choose WattStopper Quality?

WattStopper delivers professional-grade power supply solutions with plenum-rated construction and advanced control features. The BZ-250 combines high-efficiency operation with mechanically held relay technology and zero crossing switching for reliable performance in demanding commercial and industrial environments.

Manufacturer Resources

Spec Sheet

Product Specs

Product Depth Us:
3.8 in
Product Height Us:
2.7 in
Product Volume Us:
46.17 cu in
Product Weight Us:
0.5 lb
Product Width Us:
4.0 in
Department:
Electrical
Product Subgroup:
Lighting Controls & Sensors
Product Type:
Power Pack
Product Group:
Wiring Devices
Product Width:
2.916 in
Product Height:
1.673 in
Product Depth:
1.634 in

WattStopper BZ-250 – Frequently Asked Questions

1) How many occupancy sensors can a WattStopper BZ-250 power pack run?
The BZ-250 puts out 24VDC at 225mA, so the number of devices it supports depends on their draw. Add up the mA rating of every sensor and control on the low voltage side and keep the total at or under 225mA. Input is 120-277V AC, 50/60Hz, so the same pack works on either a 120V or 277V lighting branch without swapping models.
2) Can the BZ-250 power pack be installed above a drop ceiling in a return air plenum?
Yes. The BZ-250 is plenum rated, so it can go in air handling spaces above a ceiling. It measures 4.0 in wide, 3.8 in deep and 2.7 in high, which is what you need to check against the junction box or free space you are mounting to.
3) Does the BZ-250 support manual-on (vacancy) operation for energy code compliance?
It does. The BZ-250 is the auto-on/manual-on version, so the same pack covers an occupancy setup where lights come on automatically and a vacancy setup where the occupant has to press the switch to turn them on. That manual-on mode is what most commercial energy codes want in offices and classrooms.
4) What happens to the lights if power drops and comes back on a BZ-250 power pack?
You choose. The BZ-250 uses a mechanically held latching relay with selectable power loss operation, so you can set the load to come back On, stay Off, or return to its last state after an interruption. On a healthcare corridor or a stairwell you would set it On; in an office where you do not want a whole floor relighting at 2am, Off or last state.
5) Can I override the sensor and force the lights on or off from a building automation system?
Yes. The BZ-250 has hold-on and hold-off inputs for integration with building automation and lighting control systems, so a BAS or time clock can force the load on during scheduled hours or lock it off after hours regardless of what the sensor sees.
6) Will the BZ-250 handle switching on an electronic ballast or LED driver load without welding the contacts?
It switches at zero crossing, which is what protects the relay contacts from the inrush that electronic ballasts and LED drivers produce at turn-on. That is the feature that keeps a lighting relay alive over years of daily cycling.
7) Is the WattStopper BZ-250 just a transformer, or does it switch the lights too?
It does both. The BZ-250 converts 120-277V AC line power to 24VDC at 225mA to run your low voltage sensors and controls, and it carries the latching relay that actually switches the line voltage lighting load. One device, wired between the branch circuit and the fixtures, with the sensor cabling landing on the low voltage side.
8) What is the exact part number to order for the WattStopper auto-on/manual-on power pack?
Order WattStopper BZ-250. That is the 120-277V, 50/60Hz input, 24VDC 225mA output pack with auto-on/manual-on control. Country of origin is China, and shipping weight per unit is 0.5 lb, which matters if you are pulling a hundred of them for a multi-floor retrofit.
How fast can I get the WattStopper BZ-250 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 BZ-250 come with a warranty?
Absolutely. The WattStopper BZ-250 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 BZ-250?
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 BZ-250 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!