Contactor de comutare a condensatorului ABB UA16-30-10RA

2. Specificații tehnice de bază

3. Structural & Caracteristici funcționale

3.1 Structura de bază

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 Key Functions

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.

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

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

4. Optional Accessories List

5. Echivalent între mărci & Lista de înlocuire

6. Ghid de selecție & Soluții alternative

6.1 Parametri de selecție cheie

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

Tensiunea bobinei: Must match control supply voltage; common 220V/380V to avoid coil burnout.

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

Condiții de mediu: Derate for high temperature (>40°C) with derating factor 0.8~0.9.

6.2 Soluții alternative recomandate

6.3 Instalare & Note de întreținere

1. Înainte de instalare: Ensure capacitors are fully discharged to ≤50V to avoid residual charge hazards.
2. Cablaj: Main circuit wire cross-section ≥1.5mm²; control circuit ≥0.75mm²; ensure terminals are fully tightened.
3. Ciclul de întreținere: Verificați uzura de contact fiecare 6 luni; recommend replacement after 100,000 cumulative operations.
4. Depanare: If contactor fails to operate, first check coil voltage and control circuit fuse.

ABB UA16-30-10RA este un contactor de condensator încorporat cu rezistență de amortizare dedicată, proiectat pentru sistemele de compensare a puterii reactive de joasă tensiune.

Trei rezistențe în serie suprimă curentul de comutare de pornire, protejarea contactelor și prelungirea duratei de viață.

Cu rating de 16A AC-6b potrivit pentru bănci de condensatoare de 12,5 kVar la 400 V, 3-contactele principale NO la pol și contactul auxiliar 1NO îndeplinesc pe deplin cerințele standard de control.

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. Regula de denumire a modelului

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

2. Full Model List by Current Rating

2.1 16O serie (≤12.5kVar @400V)

2.2 26O serie (≤20kVar @400V)

2.3 30O serie (≤25kVar @400V)

2.4 50O serie (≤40kVar @400V)

2.5 63O serie (≤50kVar @400V)

2.6 75O serie (≤60kVar @400V)

2.7 95O serie (≤75kVar @400V)

2.8 110O serie (≤90kVar @400V)

2.9 140O serie (≤110kVar @400V)

3. Opțiuni de tensiune bobină (Universal for All Series)

4. Instrucțiuni de selecție a cheilor

4.1 Standard Type vs RA Built-in Resistor Type

Standard (Non-RA): Requires external reactor for inrush suppression; cost mai mic, 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: Fără contacte auxiliare, for simple control loops.

10 / 01: 1 NU / 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. Accesorii & Opțiuni de extindere

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.