Siemens 500-034120 PSX-12 12A 24VDC Auxiliary Power Supply Extender for Fire Alarm Systems

Description

The Siemens 500-034120 is a PSX-12 auxiliary power supply extender designed to increase the available 24 VDC power capacity of compatible Siemens fire alarm control systems. Siemens part number 500-034120 delivers up to 12 A of regulated DC output from a universal 120–240 VAC input, supporting internal system components and external fire protection devices. Its intelligent supervision, ground-fault detection, and automatic battery transfer capabilities provide monitored power distribution for commercial and industrial fire safety installations.

Technical Specifications

Information About 500-034120

The 500-034120 is a Siemens PSX-12 Series high-current power supply extender developed for FireFinder XLS, Desigo Fire Safety Modular, and Cerberus PRO Modular fire alarm systems. Its industrial-grade construction incorporates an off-line switch-mode power converter, power factor correction circuitry, and microprocessor-based supervision for stable electrical operation. The module operates alongside a compatible PSC-12 main power supply and battery charger, allowing up to three PSX-12 extenders to share a common standby battery system without requiring individual battery chargers. Designed for installation in Siemens CAB-series enclosures, it occupies one mounting position and communicates with compatible system interfaces through the HNET protocol and a 60-pin power/data bus.

Key Features:

• 12 A Power Capacity: Supplies up to 12 A of regulated 24 VDC power for internal and external fire alarm system equipment.

• Universal AC Input: Accepts 120–240 VAC at 50/60 Hz with automatic input voltage adaptation.

• Dual Output Circuits: Provides a 4 A power-limited output and a 12 A non-power-limited output, with combined loading limited to 12 A.

• Switch-Mode Conversion: Uses an off-line switch-mode power converter with power factor correction for regulated DC output.

• Intelligent Supervision: Monitors operating conditions and communicates power supply status to compatible Siemens control interfaces.

• HNET Communication: Exchanges system information through the common 60-pin power/data bus.

• Ground-Fault Detection: Identifies ground-fault conditions affecting the power supply or connected output circuits.

• Automatic Battery Transfer: Supports switching to shared standby batteries when AC input power is interrupted.

• Overcurrent Protection: Includes automatic-reset protection for output overloads and short circuits.

• Diagnostic Indicators: Provides LED indications for power status, module faults, communication faults, and output failures.

• Modular Installation: Occupies one module position in compatible Siemens enclosures or CAB-MP mounting plates.

• Shared Battery Configuration: Supports up to three PSX-12 modules connected to one PSC-12 power supply and battery system.

The 500-034120 delivers the reliability and precision required for supervised auxiliary power distribution in commercial fire alarm and life safety control systems.

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