c o m m e r c i a l O C C U P A N C Y S E N S OR S & C o n t r o l s
BZ-150 Universal Voltage Power Pack
High-efficiency switching
power supply
Overcurrent protection
(low-voltage)
Plenum rated
Zero crossing for
reliability and
increased product life
120/277VAC, 50/60Hz
Auto-ON or Manual-ON
operating mode
PROJECT
LOCATION/TYPE
Product
Overview
Engineering Building
Manual On and Bi-level Switching
The BZ-150 Universal Voltage Power Pack is full
featured and can provide 24 VDC operating voltage
to WattStopper’s low-voltage occupancy sensors.
In addition, the BZ-150 enables manual-on, holdon, hold-off and load shed applications when used
with lighting control panels or building management systems. This device is constructed
with environmentally friendly materials and is
RoHS-compliant.
Energy codes require automatic off. Some
codes and EPAct require bi-level switching. The
BZ-150 meets both of these requirements, while
seamlessly integrating manual on for maximum
energy savings. When used with a low-voltage wall
switch, Auto ON and Manual ON can be selected
while in the field by using the conveniently located
dip switch on the front. Combining switches, power
packs and sensors provides easy and cost-effective
code-compliant solutions.
The BZ-150 consists of a high-efficiency switching
power supply and a high-current relay. It has an
input of 120/277 VAC, 50/60Hz, and an output of
24VDC, 225mA. It turns the connected load on and
off automatically based on occupancy sensor input,
or manually with a low-voltage momentary switch.
The dip switch setting allows the user to select
Auto ON or Manual ON as the operating mode.
Additional low-voltage inputs provide hold-on and
hold-off features for broader applications.
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Description
Operation
Features
C87
Hold-on and hold-off
inputs
• Self-contained power supply relay system
• Efficient switching power supply providing
optimized current output based on number of
sensors
• LED indicates status of relay or if there is a low-voltage overcurrent
• Hold-on and hold-off inputs integrate with BMS,
lighting control panels & other building systems
• Integrates with low-voltage momentary switch
to control any 24VDC occupancy sensor
• RoHS-compliant
Applications
The BZ-150 can control lighting circuits, self-contained
air conditioners, pumps, fans, motors, VAV systems,
motorized damper controls and setback thermostats.
By using two low-voltage switches, a ceiling sensor and
two BZ-150s (one set to Auto ON and one set to Manual
ON) bi-level switching with manual-on operation
can be achieved. The hold-on input is ideal for retail
and commercial facilities that want to override an
occupancy sensor and force lighting on during normal
business hours. After hours, a time clock signals the
BZ-150 to cancel the hold-on lighting mode, allowing
the sensor to resume control. The hold-off input can be
used for load shedding or security systems.
• Provides auto-on or manual-on field-selectable
operating mode
• Zero crossing circuitry for reliability and increased
product life
• UL 2043 plenum rated for cost-effective installation
• 1/2” snap-in nipple attaches to standard electrical
enclosures through 1/2” knockouts
• 14 AWG wires on the relay for 20A operation
• Qualifies for ARRA-funded public works projects
Specifications
• Dimensions: 1.6” x 2.75” x 1.6”
(40.6mm x 69.9mm x 40.6mm) H x W x D
with a 1/2“ (12.7mm) snap-in nipple
• UL and cUL listed
• Five year warranty
Installation Diagram
Wiring with Occupancy Sensor
Power
Pack
Neut.
White
120VAC
Hot
277VAC
Black
Power Pack
Lighting
Load
Red
Red
Blue
Dry
Contact
Black
Grey
Orange
Hold ON
Red
Low Voltage Wires
+12-24VDC In
High voltage connection
made inside J-box
Control
Any 3-Wire
24VDC
Sensor
Common
+24VDC
+12-24VDC In
Brown
Hold OFF
Neut.
Low-voltage Momentary Switch Options
White
120VAC Black
Hot
277VAC
Orange
Brown
White
120VAC Black
277VAC
Neut.
Hot
Brown
Orange
Manual-on
& Bi-level
Switching
Two-wire Switch
2-wire Push Button
Red
Red
BZ-150
(B)
Black
Blue
Blue
Three-wire Switch
3-wire Momentary, LVS-1
Grey
Manual ON
Install
Jumper
Wire
Red
24VDC
Red
24VDC
Multibutton Switch
Multi-button
Switch,
L(x)S
Do not use pilot
or locator
Do notlight
use pilot
or locator
connects
light connections
Grey
Manual ON
Red
24VDC
BZ
S(x)
Occupancy
Sensor
Com
BZ-150
Power Pack
Low Voltage
Red
Red
Any 3-Wire
24VDC
Sensor
Low Voltage Wires
BZ2
Momentary Switch (A)
Lighting
Load (B)
AUTO ON
Grey
Control
+24VDC
Red
Red
Low Voltage Wires
Momentary Switch (B)
BZ1
Common
Grey
Grey
Manual ON
BZ-150
(A)
Black
MANUAL ON
Momentary Switch (optional)
BZ1
Line Voltage
BZ2
Lighting
Load (A)
Hold-OFF
Signal
Hold-OFF
Signal
By using two low-voltage switches, a ceiling sensor and two
BZ-150s (one set to Auto ON and one set to Manual ON) bi-level
switching with manual-on operation can be achieved.
Hold-off &
Hold-on
Applications
Load Shed (Hold-off) Application
for Open Office Spaces
Retail (Hold-on) Application
Occupancy
Sensor
BZ1
BZ2
BZ
BZ-150
Power Pack
BZ1
Occupancy
Sensor
BZ2
BZ
Low Voltage
BZ1
BZ2
BZ1
BZ3
Low Voltage
Line Voltage
BZ2
Line Voltage
BZ4
Hold-OFF
Signal
BZ3
Hold-OFF
Signal
BZ4
Hold-ON
Signal
Hold-ON
Signal
The occupancy sensor connected to each BZ-150 keeps all lights
on when the space is occupied. When the load shed command
is given (by utility meter, BMS, etc.), lights connected to BZ2 are
held off. Remaining lights (connected to BZ1) are still controlled
by occupancy sensor.
BZ-150
Power Pack
c o m m e r c i a l O C C U P A N C Y S E N S OR S & c o n t r o l s
System Layout
& Wiring
• 120/277VAC, 50/60Hz voltage input
• Secondary voltage of 24 VDC
• Secondary output of 225 mA (with relay connected)
• Low-voltage leads are rated for 300 volts
• UL-rated 94 V-O grey plastic enclosure
During store hours, a signal from a time clock to the BZ-150
holds lights on, regardless of occupancy. After hours, the
clock schedule cancels the hold-on and occupancy sensor
control takes over.
Load Ratings
BZ1
Ordering
Information
Catalog No.
BZ2
BZ1
BZ-150
Input Voltage
BZ2
120/277VAC; 50/60Hz
BZ-150-U
BZ4
BZ3
Hold-ON
Signal
Installation
Notes
BZ
BZ-150
Power Pack 20
Low Voltage
Line Voltage
BZ-150-FTA
BZ3
Ballast(A)
Occupancy
Sensor
Incan(A)
20
Motor
1 HP
120/250 VAC-rated
Output
24 VDC
225 mA w/relay
connected
BZ4
For a complete listing of Multibutton Low-voltage and Momentary Toggle Switches that will provide manual-on switching with the
Hold-ON
BZ-150, please refer to the product cut sheets
Signal in the section on Lighting Control Systems.
1) All WattStopper power packs should be installed in accordance with state. local, and national electrical codes and requirements.
2) Power packs are designed to attach to existing or new electrical enclosures with .5” 125.40mmJ knockout (check electrical codes in your area).
3) Most applications require UL-listed, 18-22 AWG, 3-conductor, Class 2 cables for low-voltage wiring. For plenum return ceilings use UL-listed plenum-approved
cables.
Pub. No. 27404 rev. 11/2010
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