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Wheelock PS-4CA - Four class "?A" plug-in module for PS-24-8MC - Discontinued

Wheelock PS-4CA - Four class âœA" plug-in module for PS-24-8MC


Product Code: 1288103

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POWERPATH™ Series PS-24-8MC is an 8 Amp, 24VDC, filtered and regulated, supervised remote power supply/charger used for supervision and expanded power driving capability for Fire Alarm Notification Appliance Circuits. The PS-24-8MC may be connected to any 12V or 24V (FWR or DC) Fire Alarm Control Panel (FACP) by using a Notification Appliance Circuit (NAC) or a “Dry Contact”. Primary applications include NAC expansion (supports ADA requirements) and auxiliary power to support system accessories. This unit provides filtered and regulated 24VDC, 8 Amp up to four (4) Class “B”, two (2) Class “A”, or two (2) Class “B” and one (1) Class “A” Notification Appliance Circuits. With the optional plug-in PS-4CA module the unit supports (4) Class “A” Notification Appliance Circuits. Additionally, an auxiliary power output of 3.5 Amps (disconnected upon AC power loss or an alarm condition) or 200 mAmps (constant) is provided, which can be manually reset. The PS-24-8MC also contains a battery charger capable of charging either 7 or 12 Amp/Hour (AH) of battery backup.
Two FACP NAC circuits or two “Dry” contact initiating circuits can be connected to the POWERPATH inputs. These inputs can then be directed to control supervision and power delivery to any combination of the four (4) outputs.
Each output is rated at 3.0 Amps (Class “B”) or (Class “A”) and can be programmed to generate a steady or Code 3 Temporal Horn sound and a strobe output under alarm condition. Total load for the PS-24-8MC NAC circuits must not exceed 8.0 Amps.
The PS-24-8MC under non-alarm condition provides independent supervision for Class “A” and Class “B” FACP NAC circuits. In the event of circuit trouble, the FACP will be notified via the POWERPATH steered input (IN1 or IN2). In addition there are two sets of trouble reporting terminals, one used for AC power loss reporting and the other for all troubles. The AC power loss reporting, on the common trouble terminals and on IN1 or IN2, can be delayed for either 30 seconds or 170 minutes. The AC power loss terminals will always report the trouble 30 seconds after loss of AC power.
The PS-24-8MC POWERPATH is UL Listed under UL Standard 864, 9th Edition to be used with any 24 volt Listed Regulated notification appliances. It includes the capability to synchronize Wheelock strobes and horns and to silence the horn signal when horn/strobes are operating on two wires.
• Approvals Include: UL Standard 864 California State Fire Marshal (CSFM), New York City (MEA), Factory Mutual (FM), Chicago (BFP) See Approvals by model in Specification and Ordering Information
• Compliant with NFPA 72
• 120VAC, 50/60Hz, 5.0 Amps Operating Power in Alarm
• 24VDC Battery Backup Connection
• Two (2), 12V or 24V NAC Initiating Circuits (8-33V at 5mA) FWR or DC
• Two (2) “Dry” Contact initiating Circuits
• Accepts two (2) Class “A” or two (2) Class “B” circuit inputs
• Built in battery charger for sealed lead acid or gel type batteries
• NAC outputs are 24VDC, 3.0 Amps each, power limited
• 8 Amps total alarm current
• Capable of four (4), Class “B” circuits
• Capable of two (2) Class “A” circuits
• Capable of four (4) Class “A” circuits with optional PS-4CA module
• Capable of one (1) Class “A” circuit and two (2) Class “B” circuits
• Temporal (Code 3) or constant voltage output
• Built-in Wheelock synchronization mode that can be fed to any or all of the output circuits
• Input and output can be synchronized with “IN>OUT SYNC” mode (SM, DSM or 2nd PS-24-8MC is required)
• Audible silence capability
• Filtered and electronically regulated output
• 3.5 Amp auxiliary power limited output with reset capability. (Removed upon AC loss or alarm. Automatic reset 30 seconds after AC power returns or the alarm condition is over) or 200 mAmps auxiliary power limited output which remains on during AC loss or an alarm condition
• Compatible with 12V or 24V (FWR or DC) FACP
• Signaling appliance circuits are supervised and steered to either IN1 or IN2
• 2.2K Ohm, 1 Watt (Wheelock Model #MPEOL) End of Line Resistor (EOLR) for supervision of all outputs
• AC loss trouble reported over a separate set of contacts (delay of 30 seconds)
• All troubles are reported over the common trouble contacts (AC loss can have a delay of 30 seconds or 170 minutes)
• Automatic switchover to standby battery when AC fails
• Thermal and short circuit protection with auto reset
• Input and output status LED indicators
• AC fail supervision
• Battery presence and low battery supervision
• Ground Fault Detection (60K ohms)
• 4 latching LED’s for NAC trouble annunciation
• Not Battery Dependent - Full 8A even if battery is degraded
• Automatic switch over to standby batteries when AC fails
• Supports sealed lead acid or gel type batteries
• Fused battery protection
• Thermal and short circuit protection with auto reset
• Supports both 7AH or 12AH batteries in the same cabinet (Cabinet Size: 16.70” H x 12.83” W x 5” D)
POWERPATH Operating Modes:
Normal Mode: Provides constant 24 VDC output upon initiation by a voltage to input IN1 or IN2 or by a contact opening on DRY1 or DRY2. The unit returns to standby mode when the input is deactivated.
Wheelock Sync Mode: Provides signals for synchronization of patented Wheelock audible and strobe notification appliances. Audibles can also be silenced in this mode while the strobes continue to flash.
In>Out Sync Mode: Accepts a coded signal or synchronization signal on the input to provide a coded output or synchronized output. This signal may come from a FACP, another POWERPATH or a Wheelock SM or DSM synchronization module. Caution: Do not use strobes on coded output circuits.
Temporal Mode: Codes the output voltage in a code-3 temporal pattern to drive audible appliances such as horns, bells or chimes. Caution: Do not use strobes on coded output circuits.

Model Number

Input Voltage/Current


120/220 VAC @ 50/60 Hz; 5.0 amps max.


Four class “A” plug-in module for PS-24-8MC

Output NAC Circuit

Output Voltage/Current

Four (4) Class “B” or

24 VDC @ 3 amps per Circuit

Two (2) Class “A” or

24 VDC @ 3 amps per Circuit

One (1) Class “A” and Two (2) Class “B” or

24 VDC @ 3 amps per Circuit (Class “A”)

Four (4) Class “A” (optional PS-4CA module)

24 VDC @ 3 amps per Circuit (Class “A”)

Standby Current

0.080 Amps

Alarm Current

0.240 Amps

Total NAC Current

8 Amps Max.

Standby Batteries

Standby Time

Alarm Output

Aux Output

Total Amps/Minutes

CP Mode

MP Mode

24 VDC/12 AH

24 Hours

8 Amps/15 Minutes

200 mA

3.5A during

(uses two (2) 12 VDC batteries in series)

60 Hours

8 Amps/15 Minutes

60 mA




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