Product Description
The Siemens 4EP4003-8DS is a robust and reliable industrial Ethernet switch designed for demanding automation environments. This unmanaged switch provides eight 10/100Base-TX ports, enabling seamless connectivity for devices on the network. Its rugged metal enclosure ensures durability and protection against harsh conditions, including extreme temperatures and electromagnetic interference. The 4EP4003-8DS supports Quality of Service (QoS) prioritization, guaranteeing optimal data transmission for critical applications. Installation is simplified with its plug-and-play design and flexible mounting options, including DIN rail and wall mounting. Integrated LED indicators provide clear status information for each port, facilitating easy troubleshooting and network monitoring. The switch operates on a wide voltage range, accommodating various power supply configurations. It meets stringent industry standards for electromagnetic compatibility and environmental protection, ensuring reliable performance in industrial settings. The Siemens 4EP4003-8DS offers a cost-effective and dependable solution for expanding network capacity and enhancing communication within industrial automation systems.
Is Your Device Showing These Signs?
The Siemens 4EP4003-8DS vacuum circuit breaker commonly experiences failures related to worn vacuum interrupters, causing dielectric breakdown and inability to interrupt fault current. Expect issues with the operating mechanism, including spring charging motor failures and latching problems, leading to breaker tripping malfunctions. Control circuit malfunctions, such as auxiliary contact degradation and wiring harness damage, impede proper signaling and remote operation. Inspect for SF6 gas leaks, resulting in diminished insulation and potential environmental hazards. Address contact erosion and alignment issues to maintain optimal conductivity and prevent overheating.
Technical specifications
The Siemens 4EP4003-8DS is a robust and reliable industrial Ethernet switch designed for demanding automation environments. This managed switch features eight 10/100/1000Base-TX ports and two 100/1000Base-X SFP ports, providing flexible connectivity options for various network topologies. It supports a wide range of Layer 2 switching functions, including VLAN, QoS, and link aggregation, to optimize network performance and prioritize critical data traffic. The 4EP4003-8DS incorporates advanced security features such as port security, access control lists (ACLs), and IEEE 802.1X authentication to protect the network from unauthorized access and cyber threats. Its ruggedized metal housing and extended operating temperature range of -40°C to +70°C ensure reliable operation in harsh industrial conditions. The switch is equipped with redundant power inputs and alarm relay outputs for enhanced system availability. Configuration and management are simplified through a user-friendly web interface, command-line interface (CLI), and Simple Network Management Protocol (SNMP). The 4EP4003-8DS complies with industry standards such as IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, and IEEE 802.3z, ensuring interoperability with other network devices. It is certified for industrial applications, including IEC 61850-3 and IEEE 1613 for power substations, and EN 50155 for railway applications. The device provides a dependable and secure networking solution for industrial automation, transportation, and other critical infrastructure applications.
Our Repair Process for the
4EP4003-8DS
Our repair process for the Siemens 4EP4003-8DS vacuum circuit breaker begins with a comprehensive inspection focusing on vacuum interrupter integrity, operating mechanism functionality, control circuit performance, SF6 gas containment, and contact condition. Vacuum interrupters are tested for dielectric strength; replacement occurs if breakdown is detected. The operating mechanism undergoes thorough examination, with spring charging motors and latching components replaced or refurbished as needed to ensure proper tripping functionality. Control circuits are meticulously evaluated, auxiliary contacts are replaced if degraded, and wiring harnesses are repaired or replaced to guarantee reliable signaling. SF6 gas leaks are located and sealed, followed by gas replenishment to specified levels. Contact surfaces are inspected for erosion and misalignment, and are reconditioned or replaced to maintain optimal conductivity and prevent overheating.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.

Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.

















