3RK1903-2AA00 SIEMENS

3RK1903-2AA00 Siemens Basis unit

Brand：SIEMENS Model number：3RK1903-2AA00

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The 3RK1903-2AA00 connection module acts as the electrical and physical base for SIRIUS ET 200S motor starters. It connects directly to the backplane bus, enabling high-density, modular panel assembly without complex point-to-point hardwiring between adjacent starter units. The module manages the distribution of the 24 V DC auxiliary control power required to energize internal contactor coils, electronics, and diagnostic sensors. By permitting permanent wiring on the terminal block base, it allows electronic motor starter modules to be installed or replaced without disturbing existing field wiring, significantly shortening maintenance windows and minimizing installation errors.

Product Parameters

Product Category: Connection module / Power module for SIRIUS ET 200S motor starters.
Rated Auxiliary Control Voltage: 24 V DC.
Permissible Control Voltage Range: 20.4 V DC to 28.8 V DC.
Rated Operational Current: Up to 10 A for control supply distribution.
IP Protection Class: IP20 protection rating against touch and foreign bodies.
Mounting Type: Snap-on mounting onto standard DIN rail (TH35) and ET 200S backplane bus structures.
Connection Technology: Spring-loaded or screw terminals for field wiring.
Supported Wire Cross-Section: 0.5 mm² to 2.5 mm² solid or stranded conductors.
Operating Ambient Temperature: -25°C to +60°C (-13°F to 140°F).
Storage Ambient Temperature: -40°C to +70°C (-40°F to 158°F).
Relative Humidity: Up to 95% non-condensing during operation.

Product Advantages

A key advantage of the 3RK1903-2AA00 is its integration into the permanent wiring concept of the SIMATIC ET 200S system, allowing for tool-free module replacement during servicing without disconnecting field cables.

The compact design optimizes panel space while providing clean separation between main power circuits and 24 V DC control wiring.

Integrated terminal options reduce installation time and prevent wiring errors during commissioning and retrofit projects.

High-quality contact elements and robust industrial housing materials ensure high vibration resistance and long-term contact reliability in harsh industrial environments.

By streamlining auxiliary power distribution across multiple adjacent motor starters, the module eliminates the need for external bridging terminals and reduces total cabinet hardware requirements.

Precautions and Considerations

Ensure that the supply voltage delivered to the module remains strictly within the specified 20.4 V DC to 28.8 V DC range to prevent control circuit instability or component damage.

Always isolate main power and auxiliary control voltage sources prior to installing, removing, or servicing the module or connected starter units.

Verify that conductor stripping lengths match the manufacturer specifications and that terminals are securely tightened or clamped to prevent localized overheating.

Do not exceed the maximum allowable current rating on the control power bus to prevent thermal overload on internal trace connections.

Maintain adequate ventilation clearance around the ET 200S rack assembly to ensure proper heat dissipation from neighboring motor starters.

Product Applications

The 3RK1903-2AA00 module is utilized in automated production and process facilities where motor starters are integrated into decentralized automation architectures.

Conveyor and Logistics Systems: Powering and controlling small-to-medium motor starters across automated sorting systems, roller conveyors, and palletizers.
Automotive Assembly Lines: Supporting modular motor starter stations along body shop, paint shop, and final assembly lines.
Packaging Machinery: Integrating multiple motor drives for wrapping, cartooning, filling, and labeling equipment into compact control cabinets.
Pumping and Aeration Systems: Providing reliable auxiliary control for small pumps, fans, and blowers in water treatment and HVAC management systems.
General Machine Building: Serving as a standardized control voltage interface module in customized OEM control panels across various manufacturing sectors.

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