3RK1903-3DA00 SIEMENS

3RK1903-3DA00 Siemens Basis unit

Brand：SIEMENS Model number：3RK1903-3DA00

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

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Product Details：

Product Dimensions：

The 3RK1903-3DA00 is a Power Connector (often referred to as a power plug or power termination) specifically for the Energy Bus of the SIMATIC ET 200PRO. In a decentralized system, instead of running individual power cables from a central cabinet to every motor, a single heavy-duty power bus is run along the production line. This connector allows individual modules to "tap" into that power bus. It is engineered with high-strength plastic and robust metal contacts to handle high current loads while maintaining a high degree of environmental protection, essential for mounting directly on machinery.

Product Parameters

Product Brand Name: SIRIUS
Product Designation: Power Connector / Plug for Power Bus
Rated Operating Voltage: Up to $400 \text{ VAC}$ (3-phase)
Rated Current: Designed to handle the full load of the ET 200PRO energy bus, typically up to $25 \text{ A}$ or $40 \text{ A}$ depending on the associated terminal module.
Connection Type: Han Q4/2 or similar heavy-duty industrial plug-in connection.
Degree of Protection: IP65/IP67 (Dust-tight and protected against powerful water jets/immersion).
Ambient Temperature: $-25\text{°C}$ to $60\text{°C}$ during operation.
Compatibility: Exclusively for use with Siemens ET 200PRO motor starters and power modules.
Wire Cross-Section: Supports large diameter cables required for industrial power distribution, typically up to $4 \text{ mm}^2$ or $6 \text{ mm}^2$ .

Product Advantages

One of the primary advantages of the 3RK1903-3DA00 is its Modular Installation capability. By using this standardized connector, technicians can quickly plug or unplug motor starters without having to rewire high-voltage terminals, which drastically reduces maintenance time. The Robust IP67 Protection is another major benefit; it eliminates the need for expensive, bulky protective enclosures since the connector itself is sealed against the oil, coolant, and dust common in automotive and machining environments.

Additionally, the Error-Proof Mechanical Coding prevents the connector from being inserted incorrectly, protecting the equipment from phase-reversal or short circuits. The use of the power bus system facilitated by this connector leads to a Reduction in Cabling Costs, as it minimizes the total length of copper wire needed to power a long production line.

Important Considerations and Precautions

When utilizing the 3RK1903-3DA00, the most critical precaution is to Never Connect or Disconnect Under Load. Opening a $400 \text{ V}$ high-current circuit while it is active will result in a dangerous electric arc that can destroy the connector and cause severe injury. Always ensure the upstream isolator or circuit breaker is locked out before handling the plug.

Furthermore, ensure that the Cable Gland and Seals are properly seated; if the cable entry is not tightened correctly, moisture can seep into the connector over time, leading to phase-to-ground faults. It is also essential to verify that the Current Carrying Capacity of the cable matches the fuse protection of the energy bus to prevent overheating. Finally, periodic inspection for Contact Oxidation is recommended in corrosive environments to maintain low resistance and prevent localized heating at the connection point.

Product Applications

The 3RK1903-3DA00 is primarily found in heavy industrial settings where decentralized control is implemented.

Automotive Assembly Lines: Powering the multiple motor starters that drive conveyor belts and lift stations across a massive facility.
Logistics and Sorting Centers: Distributing power to decentralized drives in high-speed package sorting systems.
Food and Beverage Packaging: Used in wash-down areas where the IP67 rating protects power connections from pressurized cleaning.
Machine Tooling: Providing the $400 \text{ V}$ supply to auxiliary motors and chip conveyors on large-scale CNC machining centers.
Airport Baggage Handling: Enabling modular expansion and easy maintenance of long-distance conveyor networks.

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