Purchase now: Weidmüller VPU AC I 1+1 Surge Protection
Purchase now: Atlantech Drives provides you the Weidmüller 2812790000 (Model: VPU AC I 1+1 300/12.5), a premium **Combined Lightning and Surge Arrester** (Type 1 + Type 2). While most industrial arresters are 3-phase, this unit is specifically configured for **Single-Phase Networks** (1 Phase + Neutral + Earth) typical in control cabinets, remote pumping stations, or residential service entrances. It offers a lightning impulse discharge capacity of **12.5 kA** (10/350 µs) per pole, ensuring total protection against direct strikes and grid surges.
Technical Specifications and 1+1 Topology
The «1+1» configuration means it has one varistor path between Line and Neutral, and a high-energy Gas Discharge Tube (GDT) spark gap between Neutral and Earth (TT system compatible). This prevents leakage current to earth during normal operation, extending the lifespan of the device. The VPU AC I series is rated for a maximum continuous voltage of **300 V**, making it resilient against unstable grid voltages. It features a mechanical status indicator (Green/Red) and a remote signaling contact for integration into alarm systems.
- Part Number: 2812790000.
- Model: VPU AC I 1+1 300/12.5.
- Type: Class I + II (Type 1+2).
- Network: Single Phase (L+N+PE).
- System: TT / TN-S.
- Iimp (Lightning): 12.5 kA.
- Imax (Surge): 50 kA.
- Up (Protection Level): < 1.5 kV.
- Mounting: DIN Rail 35mm.
Expert Installation Advice: Wiring Distance
Physics doesn’t negotiate. Expert Tip: For the VPU AC I 1+1 to effectively protect your PLC or Drive, the total cable length of the connecting wires (Line tap + Earth wire) must be kept **under 50 cm**. If this is impossible due to the cabinet layout, use the «V-Wiring» technique (Kelvin connection) by running the main power *through* the double terminals of the SPD (if rated for the current) or use a copper earth bar mounted directly next to the device to minimize impedance.
Frequently Asked Questions (FAQs)
Q: Is it suitable for TN-C systems?
A: No, for TN-C (2-wire L+PEN), you need a specific 2-pole varistor configuration (2+0) without the N-PE spark gap. This 1+1 unit is for systems with separate Neutral and Earth.
Q: What happens if the red flag appears?
A: It means the varistor module has degraded or blown due to a massive surge. Protection is lost. You must pull out the cartridge and plug in a replacement immediately.
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