Weidmueller VPU AC II 3+1 R 300/50 Type II Surge Protector

 

 

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The Applications

1. Industrial Control Panels in Manufacturing Facilities

Manufacturing plants rely heavily on control panels that power PLCs, variable frequency drives, sensors, and operator interfaces. These panels are frequently exposed to voltage spikes generated by motor starts, heavy machinery, and internal switching events. The VPU AC II 3+1 R 300/50 is installed at the power entry point to divert surge energy before it reaches sensitive electronics. Its rapid response limits overvoltage stress, while the 3+1 configuration stabilizes the neutral-to-earth path. Remote signaling enables maintenance teams to identify protection status early, reducing unplanned shutdowns and protecting continuous production processes.

2. Commercial Building Electrical Distribution Boards

Office buildings, hospitals, and shopping complexes depend on reliable electrical distribution to support lighting, security systems, elevators, and automation controls. Frequent load changes and large inductive equipment can introduce harmful transient voltages. The VPU AC II 3+1 R 300/50 is used within main and sub-distribution boards to suppress these disturbances and protect downstream circuits. Its coordinated protection design simplifies panel layout, while the visual status indicator supports quick inspections. This helps facility managers maintain safe operation, extend equipment lifespan, and reduce maintenance disruptions.

3. Server Rooms and Network Infrastructure

Power disturbances pose a serious risk to servers, network switches, and communication equipment, where even brief voltage spikes can lead to data loss or hardware failure. Installed upstream of critical loads, the VPU AC II 3+1 R 300/50 reduces surge levels before they reach power supplies. High discharge capability allows it to handle repeated transient events without degradation. The remote alarm contact integrates into monitoring systems, enabling fast response if protection status changes and helping ensure uninterrupted digital services.

4. Utility and Infrastructure Control Cabinets

Electrical cabinets used in utilities, water treatment plants, and transport infrastructure often operate in environments with long cable runs and elevated exposure to external surges. The VPU AC II 3+1 R 300/50 provides dependable protection for three-phase AC networks by diverting surge energy safely to earth. Its wide temperature tolerance supports operation in demanding locations, while the compact DIN-rail format allows easy installation or retrofit. This improves system resilience, lowers maintenance effort, and protects critical monitoring and control equipment.