PAD-4-9A | Siemens 9 Amp 24V Distributed Power Supply and NAC Expander for Fire Alarm Systems

Siemens · Fire & Life Safety

Description  The Siemens PAD-4-9A is a distributed power supply and NAC (Notification Appliance Circuit) expander designed to enhance Siemens fire alarm control panels by providing additional 24 V DC power for signaling devices. This model delivers up to 9 amps of total output power, supporting both audible and visual notification appliances compliant with ADA standards. Its fault-tolerant circuitry ensures consistent operation, making it ideal for large commercial, industrial, and institutional fire alarm installations.     Technical Specifications  Condition New/Never Used Surplus Brand Siemens Category Fire Safety Part Number PAD-4-9A Subcategory NAC Power Expander Output Voltage 24 V DC regulated Total Output Power 9 A maximum Auxiliary Output 3 A @ 24 V DC NAC Circuits 4 × Class B (Expandable to Class A with PAD-4-CLSA) Inputs 2 × optically isolated NAC inputs Supervisory Relays Form C (General Trouble and AC Fail) Battery Capacity Up to 7 Ah internal; larger capacities supported with optional kits Operating Voltage 120 VAC, 50/60 Hz Output Regulation Independent of primary power fluctuation Certifications UL 864 10th Edition, ULC-S527, ADA Compliant Enclosure Material Red powder-coated steel Mounting Wall-mounted enclosure Production Status Active Weight 5 lbs     Information About  PAD-4-9A The PAD-4-9A is part of Siemens’ advanced Distributed Power Supply (PAD) Series, built to expand the power and signaling capacity of Siemens FireFinder and other compatible FACPs. It provides four Class B NAC outputs (expandable to Class A with the PAD-4-CLSA module) and a 3 A auxiliary output for auxiliary equipment such as door holders and relays. The unit features integrated supervision for AC loss, ground faults, and battery conditions, ensuring reliable fault reporting through Form C relays. Engineered for long-term performance, the PAD-4-9A maintains a regulated 24 V DC output independent of power source fluctuations, ensuring stable device operation across extended wiring runs. Key Features: High NAC Power Output: Provides up to 9 A of 24 V DC power for notification appliances. Multiple Circuit Configurations: Supports four Class B circuits, expandable to Class A using the PAD-4-CLSA option. Auxiliary Power Supply: Delivers 3 A of 24 V DC power for auxiliary devices such as relays and door holders. Supervised Inputs and Outputs: Monitors AC power, batteries, ground faults, and output integrity through Form C relays. Optically Isolated NAC Inputs: Ensures reliable signal separation and prevents cross-interference with the main panel. Integrated Strobe Synchronization: Supports synchronization modules for consistent strobe operation across zones. Durable Enclosure Design: Housed in a red, metal enclosure with space for power boards and batteries up to 7 Ah or larger. Seismic and Safety Certifications: Complies with UL 864 10th Edition, ADA, and IBC/OSHPD seismic standards. The PAD-4-9A delivers the reliability and precision required for critical fire alarm power distribution and signaling system expansion.

Brand: Siemens · Category: Fire & Life Safety

Key features

• High NAC Power Output: Provides up to 9 A of 24 V DC power for notification appliances.
• Multiple Circuit Configurations: Supports four Class B circuits, expandable to Class A using the PAD-4-CLSA option.
• Auxiliary Power Supply: Delivers 3 A of 24 V DC power for auxiliary devices such as relays and door holders.
• Supervised Inputs and Outputs: Monitors AC power, batteries, ground faults, and output integrity through Form C relays.
• Optically Isolated NAC Inputs: Ensures reliable signal separation and prevents cross-interference with the main panel.
• Integrated Strobe Synchronization: Supports synchronization modules for consistent strobe operation across zones.
• Durable Enclosure Design: Housed in a red, metal enclosure with space for power boards and batteries up to 7 Ah or larger.
• Seismic and Safety Certifications: Complies with UL 864 10th Edition, ADA, and IBC/OSHPD seismic standards.

Specifications

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