PLCs, Power Supplies & Others

The Siemens 3RX9306-1AA00 delivers stable DC power to industrial automation equipment. This unit belongs to the Siemens SITOP power supply family. You will find this module in control cabinets and machine panels worldwide. It provides reliable power for PLCs, sensors, and actuators.

Manufacturer: Siemens
Series: SITOP
Category: Combined Power Supply Unit (120W)

Physical Dimensions and Weight

The Siemens 3RX9306-1AA00 measures 5.9 inches in height. Its width reaches 2.8 inches for slim rail mounting. The depth goes to 4.9 inches including terminals. This compact design fits into any standard control cabinet. The total weight comes to approximately 1.4 kilograms.

Technical Specifications and Output Capacity

This power supply accepts wide-range AC input from 85V to 264V. It operates on 50Hz or 60Hz without any adjustment. The unit produces a regulated 24V DC output at 5 amps. The total output power reaches 120 watts continuously. Furthermore, the efficiency stays above 90% across most load ranges.

Energy Storage and Hold-Up Time

The Siemens 3RX9306-1AA00 includes large electrolytic capacitors for energy storage. These capacitors hold 10,000 microfarads at 400V DC rating. This storage provides 30 milliseconds of hold-up time during line dips. Therefore, short power interruptions do not reset your connected equipment. The capacitors recharge automatically when input power returns.

Interface and Connectivity

This power supply uses screw-type terminal blocks for all connections. The input side accepts 14-18 AWG wire easily. The output side provides two separate 24V DC terminals. Two LED indicators show DC OK and overload status. A green light means normal operation for both conditions. You can wire multiple loads without additional distribution blocks.

Protection Features and Reliability

The Siemens 3RX9306-1AA00 includes comprehensive protection circuits for safety. Overcurrent protection limits output to 6.5A during overload conditions. Overvoltage protection clamps the output at 28V DC maximum. Short circuit protection shuts down the unit until you clear the fault. Thermal shutdown activates when internal temperature exceeds 85°C. These features guarantee long service life in harsh environments.

Component Layout and Construction

The Siemens 3RX9306-1AA00 contains 85 discrete components on a two-layer PCB. Key parts include a main transformer, eight diodes, and sixteen capacitors. A built-in cooling fan operates only when needed. The fan activates at 60% load or 70°C internal temperature. This design reduces noise and extends fan life significantly.

Integration and Compatibility

Use the Siemens 3RX9306-1AA00 with any 24V DC automation equipment. It works alongside Siemens S7 PLCs and SINAMICS drives. This power supply supports all standard SITOP accessories. Order this original Siemens unit to ensure reliable power for your control system.

Details