Siemens 3RK1304-5LS40-4AA0 12 Amp Electronic Overload Starter

Siemens 3RK1304-5LS40-4AA0 12 Amp Electronic Overload Starter is a direct (DOL) motor starter in the SIRIUS ET 200pro series, combining mechanical switching with electronic overload protection for field-mounted motor control. Rated for AC-3 duty, the starter is designed for motors up to 5.5 kW at 400V with a current range of 1.5 to 12 A, and provides 4 digital inputs for local and remote control signals. As a PROFINET-based distributed starter, it integrates into the ET 200pro system for direct-on-line starting and protection of motors in industrial automation applications.

Product Datasheet

• Brand: Siemens (SIMATIC / SIRIUS)
• Model: 3RK1304-5LS40-4AA0
• Series: ET 200pro (SIRIUS motor starters)
• Product Name: Direct Motor Starter (DSE HF, High Feature)
• Design: Direct (DOL) starter, mechanical switching, electronic overload protection
• Duty: AC-3
• Motor Power: Up to 5.5 kW at 400V (per family type 3RK1304-5LS40-2AA0)
• Current Range: 1.5–12 A
• Digital Inputs: 4
• Connectors: Han Q4/2 – Han Q8/0 (per family)
• Application: Distributed direct-on-line motor starting and protection

Fault Troubleshooting and Common Questions

1. The starter does not communicate with the PLC. Check the ET 200pro network connection, the BaseUnit seating, and the 24V DC control supply. Verify the station is recognized in the engineering software and that the device name and IP settings are correct.
2. The motor does not start or stop correctly. Check the control commands from the PLC, the digital input wiring, and the main circuit connections. Verify the motor cables are landed correctly on the starter output terminals.
3. The starter trips on overload or reports a fault. Check the motor current against the starter’s 1.5–12 A setting range and the configured overload class. Inspect the motor and wiring for faults, and reset the starter per the operating instructions.
4. Can the 3RK1304-5LS40-4AA0 replace another ET 200pro starter? Not without verification. Compare the full part number and option code, current range, AC-3 rating, connectors, and configuration with the existing starter and application.

Safety Precautions

• Isolate main and control power and follow lockout/tagout procedures before removing or installing the starter.
• Use electrostatic discharge protection when handling electronic assemblies.
• Verify main circuit and control wiring before energizing the starter.
• Do not connect motors until the electrical ratings have been confirmed.
• Use qualified personnel for troubleshooting and commissioning in operating machine systems.

Frequently Asked Questions

Q1: What is the Siemens 3RK1304-5LS40-4AA0? It is a direct (DOL) motor starter in the SIRIUS ET 200pro series with mechanical switching and electronic overload protection.

Q2: What is the motor power and current range? The family type supports motors up to 5.5 kW at 400V with a current range of 1.5 to 12 A.

Q3: How is the starter controlled? It integrates into the ET 200pro system for distributed control, with 4 digital inputs for local and remote signals.

Q4: What should be checked before purchase? Verify the model label, full part number and option code, current range, connectors, firmware/configuration, and compatibility with the existing ET 200pro system and motor.