Siemens AS-i Interface power supply unit, 230 - 500VAC, 8A Part number 3RX9503-0BA00

Product Overview

The Siemens 3RX9503-0BA00 is an AS-Interface power supply unit designed to supply 30 V DC to AS-Interface networks and connected field devices. It converts AC mains input to a controlled DC output suitable for AS-Interface bus systems. With integrated fault detection and overload protection, it ensures safe and reliable powering of AS-Interface circuits in industrial automation environments.

Key Features

• AS-Interface power supply unit — for AS-i bus systems
• DC output: 30 V DC (nominal), suitable for AS-Interface standard voltage
• Rated output current: 8 A — provides sufficient current for multiple AS-i devices
• Wide input voltage range: accepts AC mains from ~85–132 V or 176–550 V AC (depending on supply range/region) — flexible global installation
• Integrated ground-fault detection and output overload/short-circuit protection — improves network safety and reliability
• Mains buffering time on supply failure: ≥ 20 ms at rated load — ensures stable supply during short disturbances
• Spring-loaded terminals for input, output and diagnostic connections — simplifies wiring and maintenance
• DIN-rail mounting (standard rail) — compact and easy cabinet installation
• Protection class: IP20 — suitable for enclosed industrial cabinet use

Technical Specifications

• Article Number: 3RX9503-0BA00
• Product Type: AS-Interface power supply unit
• Output Voltage (DC): 30 V DC (rated) — typical output tolerance DC 29.5 … 31.6 V
• Output Current (max): 8 A (DC) for AS-Interface bus and devices
• Input Voltage (AC): 85‒132 V AC or 176–550 V AC (range depending on model/region) 50/60 Hz
• Mains Frequency Range: 47–63 Hz
• Mains Buffering Time (at rated current): ≥ 20 ms
• Output Ripple (0–10 kHz): ≤ 300 mV peak-to-peak (AS-i+/AS-i– lines)
  Spikes (10–500 kHz): ≤ 50 mV peak-to-peak (per AS-i standard)
• Protection Functions: Short-circuit protection, overload protection, ground-fault detection
• Terminal Types: Spring-loaded terminals — for input, AS-i output, and diagnostics (diagnostic output 0.14–1.5 mm²; main terminals 0.2 – 2.5 mm²)
• Mounting: DIN-rail (standard 35 mm) — rail mountable unit for control cabinets
• Protection Rating (Housing): IP20 (requires enclosure for safe installation)
• Efficiency (at rated output): ~87 % — efficient power conversion and minimal waste heat

Compliance & Standards

• Designed for AS-Interface (AS-i) network power supply according to AS-i specifications
• Primary/secondary isolation compliant with SELV requirements — safe galvanic separation of mains and AS-i circuits
• Meets relevant EMC and safety standards for industrial power-supply units under SINAMICS / Siemens automation environment
• Suitable for global use thanks to wide input-voltage range and frequency compatibility

Applications

The 3RX9503-0BA00 is used to supply power to AS-Interface networks and connected sensors, actuators or field modules in automation systems, industrial plants, conveyor controls, machine installations or safety logic setups. It is ideal wherever a dedicated, controlled 30 V DC supply is required for AS-i bus wiring, especially in cabinets, control panels or distributed I/O installations — with built-in safety and fault-detection functions to protect connected devices and ensure system reliability.