Purchase now: Weidmüller VPU AC I 3+1 Surge Protection
Purchase now: Atlantech Drives provides you the Weidmüller 2812760000 (Model: VPU AC I 3+1 300/12.5), a robust **Type 1 + Type 2 Combined Lightning and Surge Arrester**. Designed for the main power distribution board of industrial facilities, this device protects 3-phase networks (TT / TN-S) against direct lightning strikes (10/350 µs waveform) and switching surges. With a lightning impulse current rating of **12.5 kA per pole**, it meets the requirements for Lightning Protection Levels III and IV.
Technical Specifications and Spark Gap Technology
The VPU AC I series uses a high-performance **Spark Gap** technology for the N-PE path and powerful Varistors for L-N paths. This combination ensures low residual voltage (Protection Level Up < 1.5 kV) while handling massive energy discharges. The "300" in the model name refers to the maximum continuous voltage (Uc = 300V), providing a safe margin for 230/400V grids with voltage fluctuations. It includes a remote signaling contact to alert the BMS in case of failure.
- Part Number: 2812760000.
- Model: VPU AC I 3+1 300/12.5.
- Type: Type 1 + Type 2 (Class I+II).
- Network: 3-Phase + Neutral (TT / TN-S).
- Lightning Current (Iimp): 12.5 kA (10/350 µs).
- Max Discharge (Imax): 50 kA (8/20 µs).
- Voltage (Uc): 300 V AC.
- Protection Level (Up): < 1.5 kV.
- Signaling: Remote contact + Red/Green flag.
Expert Maintenance Tips: The Green Flag
Don’t just install and forget. Expert Tip: Check the indicator window after every major storm. Green means fully operational. If it shows **Red**, the protection module has sacrificed itself to save your equipment and MUST be replaced immediately. The VPU design allows you to replace the pluggable cartridge without touching the base wiring or turning off the main power (hot-swappable), ensuring continuous protection.
Frequently Asked Questions (FAQs)
Q: Do I need a Type 2 arrester downstream?
A: Usually no. Since the Up is < 1.5 kV, this unit protects terminal equipment directly if the distance is less than 10 meters. For longer distances, install a Type 2 or Type 3 closer to the sensitive load.
Q: What fuse rating is required?
A: It is fuse-free up to **250 A gG** mains fuse. If your main incomer is > 250A, you need a backup fuse for the SPD.
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