Siemens 3RK1903-0AC10 Terminal module

Description

Siemens 3RK1903-0AC10 Terminal module

Product Dimensions：

The Siemens 3RK1903-0AC10 (technical designation: TM-RS90S31) is a high-reliability Terminal Module designed for the SIMATIC ET 200S distributed I/O system. It is specifically engineered to host and provide electrical connectivity for 90 mm wide reversing motor starter modules (RS-X or RS1-X).

Product Detailed Description

The 3RK1903-0AC10 terminal module acts as the physical, mechanical, and electrical backplane interface for ET 200S reversing motor starters. In the modular ET 200S lineup, terminal modules are snapped onto a standard DIN rail first, wired, and then the electronic/motor starter modules are plugged into them.

This specific module is designed without a direct supply line connection, meaning it utilizes the internal power busbars (40 A capacity) of adjacent connected modules in the ET 200S lineup to distribute power across the rack.

Technical Parameters

Product Advantages

• Permanent Wiring Design: The terminal module separates the wiring from the active electronics. You can pre-wire the cabinet without the motor starters plugged in, protecting the expensive starters during construction.
• Hot-Swappable Maintenance: If a motor starter fails, it can be replaced by unplugging it from the 3RK1903-0AC10 without disconnecting a single power or signal wire, significantly reducing repair time.
• High Current Carrying Capacity: The integrated 40 A internal power bus enables efficient power distribution across multiple motor starters without daisy-chaining bulky physical cables.
• Robust Safety and Touch Protection: Its finger-safe design (IP20) protects cabinet technicians from accidental contact with live high-voltage terminals.

Important Considerations (Precautions)

• No Direct Supply Line Terminals: This module is designed without direct power feed terminals. It relies on a neighboring supply terminal module (such as a 3RK1903-0AA00 or similar with a power feed-in) to supply electricity to the shared 40 A internal bus.
• Module Width Match: Ensure you only plug 90 mm wide reversing starters into this terminal module. Attempting to fit standard 45 mm or 65 mm starters will result in mechanical misalignment.
• Torque Specifications: Tighten screw connections to the manufacturer’s recommended torque. Loose screw terminals can lead to resistance buildup, overheating, or failure under heavy motor starting loads.
• Phase Alignment: Confirm that the 3-phase motor wiring matches your target motor rotation direction before snapping the starter onto the terminal block.

Product Applications

The 3RK1903-0AC10 is commonly used in decentralized automation setups where space optimization is critical:

• Conveyor Belt Systems: To control 3-phase AC motors that require bi-directional movement (forward and reverse).
• Automated Warehousing: Operating shuttle systems, vertical lifts, and sorting lines.
• Packaging Machines: Powering and switching rotational mechanisms that need frequent direction reversals.
• Control Cabinet Engineering: Serving as a modular foundation inside centralized or decentralized motor control centers (MCCs) utilizing ET 200S architectures.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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