ABB Capacity Duty Contactors

Description

ABB’s capacitor-duty contactors—such as models UA..RA and UAFC..RA—are specifically designed to reliably switch capacitor banks with extremely high inrush currents. Equipped with built-in damping resistors to manage peaks up to 100× or 200× the rated RMS current, these contactors ensure safe, repetitive performance in power factor correction systems.ABB Grouprkepl.co.in

Specifications

• 1SBL411022R8600 (UA75-30-00)

  • Capacitor Rating: 50 kVAR

  • Coil Voltage: 400–415 VAC

  • 3-pole design with damping resistor for peak current handlingElectrihub

• 1SBL411024R8400 (UA75-30-00RA)

  • capacitor Rating: 60 kVAR

  • Coil Voltage: 110 VAC

  • Designed for applications where inrush currents exceed 100× nominal RMS currentElectrihub

• 1SBL371022R8400 (UA63-30-00RA)

  • Capacitor Rating: 45 kVAR

  • Coil Voltage: 110 VAC, 3-pole configurationElectrihub

Additional models include various ratings like 12.5 kVAR, 40 kVAR, 50 kVAR, and more, with coil voltages ranging from 24 VAC to 415 VAC.Power Factor Shop+1

Features

• Damping resistors integrated for arc suppression and managing extreme inrush peaks (up to 200× In)ABB Grouprkepl.co.in

• Compact, space-efficient design with modular accessory compatibility through the common AF platformABB Group

• Reliable for frequent switching cycles in demanding reactive load applications

Applications

• Switching capacitor banks in power factor correction panels

• Industrial and commercial electrical distribution systems with reactive load management

• Rapid reactive compensation setups where voltage stability is essential

Advantages

• High inrush current endurance, avoiding premature failure

• Arc suppression and reliability via integrated damping resistors

• Compact, modular design compatible with typical contactor accessories

• Consistent performance under aggressive switching conditions

Disadvantages

• Higher cost and design complexity compared to standard motor-duty contactors

• Requires careful sizing and derating during panel design

• Capacitor loads and high-frequency cycling may increase wear on contacts over time