Contator de comutação de capacitor ABB UA16-30-10RA

2. Especificações Técnicas Principais

3. Structural & Recursos funcionais

3.1 Estrutura Central

Built-in Damping Resistor Module: 3 independent resistors connected in series to the main circuit, realizing capacitor pre-charging and limiting switching peak current to a safe level.

Special Contact Design: Main contacts adopt anti-welding alloy material to enhance arc erosion resistance and withstand frequent inrush current impact.

Mechanical Interlock Mechanism: Ensures resistors close before main contacts and open after main contacts, completing a full current-limiting protection cycle.

Modular Accessory System: Supports expansion with auxiliary contacts, surge suppressors and other accessories.

3.2 Funções principais

Inrush Current Suppression: Built-in resistors reduce switching inrush current from 100×In to about 10×In, greatly lowering contact ablation risk.

Reactor-Free Design: RA series with inherent current limiting; no need for external series reactors, saving installation space and cost.

Operação Segura: Capacitor bank must discharge to ≤50V before re-energization to prevent secondary inrush current caused by residual charge.

Signal Feedback: 1NO auxiliary contact for status indication and interlock control.

4. Optional Accessories List

5. Equivalente entre marcas & Replacement List

6. Diretrizes de seleção & Soluções Alternativas

6.1 Parâmetros de seleção chave

Capacitor Capacity: UA16-30-10RA suitable for 3-phase capacitor banks ≤12.5kVar@400V / ≤20kVar@600V.

Tensão da bobina: Must match control supply voltage; common 220V/380V to avoid coil burnout.

Montagem: Confirm 35mm standard DIN rail; special bracket required for non-standard rails.

Condições Ambientais: Derate for high temperature (>40°C) with derating factor 0.8~0.9.

6.2 Recommended Alternative Solutions

6.3 Instalação & Notas de manutenção

1. Antes da instalação: Ensure capacitors are fully discharged to ≤50V to avoid residual charge hazards.
2. Fiação: Main circuit wire cross-section ≥1.5mm²; control circuit ≥0.75mm²; ensure terminals are fully tightened.
3. Ciclo de Manutenção: Inspecione o desgaste dos contatos a cada 6 meses; recommend replacement after 100,000 cumulative operations.
4. Solução de problemas: If contactor fails to operate, first check coil voltage and control circuit fuse.

ABB UA16-30-10RA é um contator de capacitor integrado com resistor de amortecimento dedicado projetado para sistemas de compensação de potência reativa de baixa tensão.

Três resistores em série suprimem a corrente de partida de comutação, protegendo contatos e prolongando a vida útil.

Com classificação 16A AC-6b adequada para bancos de capacitores de 12,5kVar a 400V, 3-Os contatos principais NA do pólo mais o contato auxiliar 1NA atendem totalmente aos requisitos de controle padrão.

Compared with ordinary contactors, the RA series needs no external reactor and features simple installation, making it an ideal choice for industrial and building power distribution reactive compensation systems.

Complete Model List of ABB UA Series Capacitor Switching Contactors

1. Regra de nomenclatura de modelo

ABB UA series capacitor contactors adopt a unified naming format for quick parameter identification:

2. Full Model List by Current Rating

2.1 16Uma série (≤12.5kVar @400V)

2.2 26Uma série (≤20kVar @400V)

2.3 30Uma série (≤25kVar @400V)

2.4 50Uma série (≤40kVar @400V)

2.5 63Uma série (≤50kVar @400V)

2.6 75Uma série (≤60kVar @400V)

2.7 95Uma série (≤75kVar @400V)

2.8 110Uma série (≤90kVar @400V)

2.9 140Uma série (≤110kVar @400V)

3. Opções de tensão da bobina (Universal for All Series)

4. Key Selection Instructions

4.1 Standard Type vs RA Built-in Resistor Type

Padrão (Non-RA): Requires external reactor for inrush suppression; menor custo, suitable for systems with existing reactors.

RA Built-in Resistor Type: 3 built-in damping resistors reduce switching inrush from 100×In to approx.10×In; no extra components needed for easy installation.

4.2 Auxiliary Contact Selection

00: Sem contatos auxiliares, for simple control loops.

10 / 01: 1 NÃO / 1 NC for status indication and interlock.

11: 1NO+1NC for complex control logic such as automatic switching systems.

4.3 Capacitor Capacity Reference (@400V)

5. Acessórios & Expansion Options

ABB UA series capacitor switching contactors cover full current range 16A~140A, providing standard type and RA built-in resistor type.

Flexible auxiliary contact configurations (00/10/01/11) and global compatible coil voltages are available.

The RA series effectively reduces switching inrush current, protects contacts and extends service life, making it the ideal solution for low-voltage reactive power compensation systems.