Purchase now: Weidmüller VPU PV I+II 3 1000 Solar Protection
Purchase now: Atlantech Drives provides you the Weidmüller 2797190000 (Model: VPU PV I+II 3 1000), a combined **Type 1 + Type 2 Surge Protection Device (SPD)** specifically engineered for **Photovoltaic (PV)** DC systems. This unit is designed to protect solar inverters and DC combiner boxes from both direct lightning strikes (10/350 µs waveform) and induced switching surges (8/20 µs). Rated for a maximum open-circuit voltage of **1100 V DC** (Ucpv), it is the standard protection for modern residential and commercial solar installations.
Technical Specifications and Y-Circuit
The VPU PV series uses a fault-resistant **Y-Circuit** topology. This design prevents leakage currents to earth during normal operation, which minimizes insulation faults and extends the life of the varistors. The unit has **3 protection paths** (+ to Earth, – to Earth, + to -). It features a high discharge capacity of **12.5 kA (Iimp)** per pole for lightning currents and **40 kA (Imax)** for surges. Like the AC version, it has a visual status window and a remote signaling contact.
- Part Number: 2797190000.
- Model: VPU PV I+II 3 1000.
- Application: Photovoltaic DC side.
- Type: Type 1 + Type 2 (Combined).
- Max PV Voltage: 1100 V DC.
- Lightning Current (Iimp): 12.5 kA (10/350 µs).
- Surge Current (In): 20 kA (8/20 µs).
- Circuit: Y-configuration (No leakage).
- Approvals: EN 50539-11.
Expert Installation Advice: DC Polarity
PV arcs are dangerous. Expert Tip: Although the VPU PV is often marked with + and -, the Y-circuit provides some flexibility, but strictly follow the marking to ensure the internal thermal disconnect works correctly. If a varistor overheats and shorts, the thermal disconnect must extinguish the DC arc. Weidmüller’s specialized DC arc extinguishing chamber ensures this happens safely without causing a fire. Never use an AC SPD for a DC solar string!
Frequently Asked Questions (FAQs)
Q: Where should I install this?
A: Install it as close as possible to the inverter’s DC input. If the cable run from the panels to the inverter is longer than 10 meters, you should install a second unit near the panels.
Q: What is «I+II»?
A: It means it meets the standards for both Lightning Arresters (Type 1 – high energy) and Surge Arresters (Type 2 – clamping voltage), offering total protection in one device.
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