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ABB RVAR5612 Varistor Unit  

1. Key Parameters

• Product Model: RVAR5612
• Product Series: ABB RVA-Series Industrial Low-Voltage Varistor Units (Surge Protection)
• Core Function: Transient overvoltage clamping; surge current absorption; equipment protection; DIN rail mounting.

2. Core Features

• Fast Surge Response: <25ns reaction time clamps transient overvoltages before they reach sensitive equipment, minimizing damage risk.
• High Surge Capacity: 20kA (8/20μs) tolerance withstands multiple surge events (e.g., repeated lightning-induced transients).
• Easy Integration: DIN rail mounting fits standard control cabinet layouts; compact size saves space in dense installations.
• Visual Status: Optional indicator (when paired with monitoring module) shows varistor health, simplifying maintenance.

3. Application Fields

• Control Cabinets: Protects PLCs, I/O modules, and relays in industrial automation cabinets from power line surges.
• Motor Drives: Shields frequency converter input circuits (e.g., ACS800 series) from voltage spikes during switch operations.
• Power Distribution: Installed in low-voltage terminal blocks to safeguard building/plant auxiliary power systems.
• Instrumentation: Guards precision sensors and transmitters against transient overvoltages in process control loops.

4. Precautions

• Voltage Matching: Use with systems rated ≤275V AC; overvoltage beyond Uc may reduce varistor lifespan.
• Installation: Connect in parallel with protected equipment; ensure secure terminal wiring (torque 0.8-1.2 N·m).
• Maintenance: Replace after a major surge event (e.g., lightning strike); check for physical damage (cracks, bulging) quarterly.
• Spare Parts: Use genuine ABB RVAR5612 units—non-genuine varistors may have inconsistent clamping performance, leaving equipment unprotected.

The structure and details of the product：

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