S-24 & HS-24SELECTABLE CANDELA
strobe & horn/strobes
Features
24VDC units have field selectable candela options of 15, 30, 60,75, & 110•Super-Slide® Bracket - Ease of Supervision Testing•
Checkmate® - Instant Voltage Verification•
Synchronize strobe and/or horn with AVSM Control Module•
Prewire entire system, install mounting bracket, then install
signals•
Documented lower installation and operating costs•
Input terminals accept 12 to 18 AWG•
Switch selection for high or low dBA•
Switch for chime, whoop, mechanical and 2400Hz tone•
Tamperproof re-entrant style grill•
Switch for continuous or temporal 3 tone (not available on whooptone)•Surface mount with the AVBB (Surface Mount Back Box)
•Silence audible while visual appliance will remain flashing (foruse in accepted jurisdictions)•Faceplate available in red or off-white
Operating Temperature•
32°F to 120°F (0°C to 49°C). The HS and S Series are not listed
for outdoor use.
Unit Dimensions•5” (12.7 cm) high x 4.5” (11.43 cm) wide x 2.5” (6.35 cm) deep•S3247Description
The S-24/HS-24 Series is a low profile strobe and horn/strobe
combination that offers dependable audible and visual alarms and theabsolute lowest current available.
The S-24 & HS-24 Series 24VDC offers tamperproof field
selectable candela options of 15, 30, 60, 75, and 110 candela.
The Strobe and Horn/Strobe offers a continuous or sync
temporal three in 2400Hz and mechanical tone, a chime and whooptone. All tones are easy for the professional to change in the field by theuse of switches.
The S-24 & HS-24 Series has a minimal operating current
and has a minimum flash rate of 1Hz regardless of input voltage.

This Series is shipped with a standard 4" metal mounting
plate which incorporates the popular Super-Slide® feature that allows
the installer to easily test for supervision. The product also features alocking mechanism which secures the product to the bracket without
any screws showing.
The S-24/HS-24 also features the patented Checkmate® Instant Voltage Verification feature which allows the installer to checkthe voltage drop draw and match it to the blueprint.
The S-24 & HS-24 Series appliances are ANSI/UL 464 andANSI/UL 1971, listed for use with fire protective systems and arewarranted for three years from date of purchase.

Potter Electric Signal Company, LLC • St. Louis, MO 63042 USA• Cust Service: 866-572-3005 • Tech Support: 866-956-0988 • Canada 888-882-1833 • www.pottersignal.com
PRINTED IN USA

MFG. #8830054 - REV A
06/13

PAGE 1 OF 4

S-24 & HS-24

SELECTABLE CANDELA
strobe & horn/strobes
Tone Switch Locations
TONE

SWITCH POSITION
345Mechanical Temporal 3

ONONON

Mechanical - Continuous

OFFON

ON

2400Hz - Temporal 3ONOFFON

2400Hz - Continuous

OFFOFFON

Chime - Temporal 3ONONOFF

Chime - Continuous

OFFONOFFWhoopONOFFOFFWhoop

OFFOFFOFF

NOTE:•
Switch Positions 1 and 2 in the OFF position toselect isolated horn and strobe power inputs•
Switch Position 6 ON = HIGH dBA•
Switch Position 6 OFF = LOW dBA
Super Slide® Mounting Bracket
Allows the installer to pre-wirethe system, test for systemsupervision, remove the signal
head until occupancy, switch
out signals withoutchanging mounting brackets
and has locking edge connector
for snap-in-place installation.

Checkmate® InstantVoltage Verification
It is often necessary to confirm the voltage
drop along a line of devices. The accessholes are provided in the back of theterminal block to allow the voltage to bemeasured directly without removing thedevice. Typically, this would be done at theend of line to confirm design criteria. Most
measurements will be taken using the S+
and S- locations althouhg access is provided
to other locations.
NOTE: Care should be taken to not shortthe test probes.

Candela selection slider switch.
Depress center and slide switch
to desire brightness level.

Break off pin and insert
into hole at the bottom ofthe selector to lockcandela setting. Signal
must be removed frombracket and pin pushedforward from backside outof hole to change candela.
To remove bezel, grip both sides of bezel
and pull in a download and outward motion.
Potter Electric Signal Company, LLC • St. Louis, MO 63042 USA• Cust Service: 866-572-3005 • Tech Support: 866-956-0988 • Canada 888-882-1833 • www.pottersignal.com
PRINTED IN USA

MFG. #8830054 - REV A
06/13

PAGE 2 OF 4

S-24 & HS-24

SELECTABLE CANDELA
strobe & horn/strobes
S-24 24 VDC Selectable Candela, Low Profile Evacuation Strobe
Model
NumberPart
NumberNominalVoltage

Candela(ANSI/UL 1971)

S-24WR

489001024 VDC15, 30, 60, 75, 110

S-24WW4890011

24 VDC15, 30, 60, 75, 110

HS-24 24 VDC Selectable Candela, Low Profile Evacuation Horn/Strobe
Model
NumberPart
NumberNominalVoltage

Candela(ANSI/UL 1971)

Reverberant dBA at
10 ft., per ANSI/UL 464

In Anechoic RoomdBA at 10 ft.

HS-24WR

4890030

24 VDC15, 30, 60, 75, 110

62-82

100

HS-24WW

4890031

24 VDC15, 30, 60, 75, 110

62-82

100

S-24 & HS-24 Product Strobe Current Ratings (mA)
24 VDC (16-33 Volts)
Candela

24 VDCUL Max1

15 cd

30 mA

42 mA

30 cd

35 mA

58 mA

60 cd

66 mA

97 mA

75 cd

80 mA

116 mA110 cd103 mA

161 mA

Model Designations:
W = Wall Mount
R = Red Faceplate

W = White Faceplate

All units are available in plain (no lettering).
Plain units are non-returnable.
ALERT bezel available for order.
ALERT bezel available for order.

S-24 & HS-24 Product Horn Current Ratings
Horn Decibel Levels

Horn Current Ratings

Horn Mode

Minimum SPL
at 10 ft., per
ANSI/UL 464(HIGH)Minimum SPL
at 10 ft., per
ANSI/UL 464(LOW)

Regulated 24 VDC
Max. Operating @High Setting (mA)

Temp 3 2400 Hz

78 dBA

71* dBA

28 mA

Temp 3 Mechanical

76 dBA

70* dBA

25 mA

Temp 3 Chime

70* dBA

66* dBA

15 mA

Continuous 2400 Hz

81 dBA

74* dBA

28 mA

Continuous Mechanical

80 dBA

72* dBA

25 mA

Continuous Chime

70* dBA

66* dBA

15 mA

Whoop

82 dBA

69* dBA

56 mA

NOTES:•For nominal and peak current across ANSI/UL regulated voltage range for filtered DC power and unfiltered (FWR [Full Wave Rectified])
power, see installation manual.
•Potter does nto recommend usign a coded or pulsing signaling circuit with any of our strobe products.

•The sound output for the temporal 3 tone is rated lower since the time the horn is off is averaged into the sound output rating. While thehorn is producing a tone in the temporal 3 mode its sound pressure is the same as the continuous mode.

*      Operating the horn in this mode at this voltage will result in not meeting the minimum ANSI/UL 464 reverberant sound level required for        public mode fire protection service. These settings are acceptable only for private mode fire alarm use. Use the high dBA setting for public        mode application (not applicable when using the chime tone. The chime tone is always private mode).
Potter Electric Signal Company, LLC • St. Louis, MO 63042 USA• Cust Service: 866-572-3005 • Tech Support: 866-956-0988 • Canada 888-882-1833 • www.pottersignal.com
PRINTED IN USA

MFG. #8830054 - REV A
06/13

PAGE 3 OF 4

S-24 & HS-24

SELECTABLE CANDELA
strobe & horn/strobes
Architect & Engineering Specifications
The audible and/or visible signal shall be Potter S-24 strobe and Potter HS-24 horn/strobe Series or approved equal and shall be listed
by Underwriters Laboratories, Inc. per ANSI/UL 1971 and/or ANSI/UL 464. The notification appliance shall also be listed with Factory Mutual
Listing Service (FM) and the California State Fire Marshal (CSFM).
The notification appliance (combination audible/visible) shall produce a peak sound output of 100dBA or greater at 24VDC as
measured in an anechoic chamber. The signaling appliance shall also have the capability to silence the audible signal while leaving the visible
signal energized with the use of a single pair of power wires. Additionally, the user shall be able to select either continuous or temporal tone
output with the temporal signal having the ability to be synchronized.
Unit shall be capable of being installed so that any unauthorized attempt to change the candela setting will result in a trouble signal at
the fire alarm control panel.
The audible/visible and visible signaling appliance shall also maintain a minimum flash rate of 1Hz or up to 2Hz regardless of power
input voltage. The strobe appliance shall have an operating current of 42mA or less at 24VDC for the 15Cd strobe circuit.
The appliance shall be polarized to allow for electrical supervision of the system wiring. The unit shall be provided with a mounting
bracket with terminals and barriers for input/output wiring and be able to mount to a single gang or double gang box or double workbox without
the use of an adapter plate. The unit shall have an input voltage range of 16-33 volts with either direct current or full wave rectified power for
24VDC models.
The appliance shall be capable of testing supervision without disconnecting wires, verify voltage without removing unit and be
capable of mounting to a surface back box.
Conventional Wiring Diagrams for Emergency Notification Evacuation Series

NOTES:•All strobes are designed to flash as specified with continuous applied voltage. Strobes should not be used on coded or pulsing        signaling circuits. However, use of the Potter AVSM control module or Gentex synchronization protocol is permitted to synchronize        the strobe, horn, and/or mute the horn.
•FOR SYNCHRONIZATION WIRING INFORMATION, REFERENCE AVSM CONTROL MODULE DATA SHEET (8830050)
AND/OR AVSM CONTROL MODULE MANUAL FOR SYNCHRONIZATION MODULE WIRING DIAGRAMS. AVSMCONTROL MODULE DATA SHEET AND MANUAL CAN BE OBTAINED AT http://pottersignal.com OR CALL POTTERELECTRIC AT 1-800-325-3936.

Potter Electric Signal Company, LLC • St. Louis, MO 63042 USA• Cust Service: 866-572-3005 • Tech Support: 866-956-0988 • Canada 888-882-1833 • www.pottersignal.com
PRINTED IN USA

MFG. #8830054 - REV A
06/13

PAGE 4 OF 4