ABB ACA 4.25-25.5 kVAr Low-Voltage Three-Phase Power Capacitor

Technical Specifications

Rated power: 25.5 kVAr. Rated voltage: 400/415V AC, 50/60Hz. Number of phases: 3. Connection: delta. Dielectric: metallized polypropylene film. Capacitance tolerance: -5/+10%. Losses: <0.3 W/kVAr. Operating temperature range: -25°C to +55°C. Protection rating: IP20. Terminal type: screw terminals.

Functional Features

All-film dielectric construction provides long service life and low losses. Self-healing dielectric properties improve reliability. Integrated overpressure safety disconnector prevents failure propagation. Compact design saves cabinet space. Standard screw terminals enable easy installation. Low-loss design reduces energy waste.

Application Scenarios

It provides power factor correction for industrial distribution panels, motor control centers, pump and compressor drives, manufacturing plants and commercial building electrical systems.

Performance Parameters

Rated power: 25.5 kVAr @ 400V. Losses: <0.3 W/kVAr. Capacitance tolerance: -5/+10%. Operating temperature range: -25°C to +55°C. Service life: >100,000 hours.

Material Composition

Dielectric: metallized polypropylene film. Electrodes: vacuum-deposited zinc/aluminum. Casing: galvanized steel sheet with powder coating. Terminals: tin-plated copper. Impregnation: biodegradable vegetable oil.

Structural Characteristics

It features a rectangular metal casing, top screw terminal block, internal capacitor winding elements, overpressure safety device, and mounting feet.

Working Principle

The capacitor bank draws leading reactive current from the supply, offsetting the lagging reactive current drawn by inductive loads such as motors and transformers. This improves overall system power factor, reduces line current and minimizes distribution losses.

Installation Requirements

Mount vertically in a ventilated cabinet. Use appropriately sized copper cable for connections. Torque terminal screws to manufacturer-specified values. Connect protective earth ground. Ensure adequate clearance around unit for ventilation.