ABB UA16-30-10RA is a three-pole AC-6b capacitor-switching contactor rated at 12.5 kvar at 400–415 V AC, with damping resistors, a 400–415 V AC 50 Hz or 415–440 V AC 60 Hz coil and one normally open auxiliary contact.
£134.18
The ABB UA16-30-10RA, order code 1SBL181024R8610, is a specialised three-pole capacitor-switching contactor with damping resistors designed for power factor correction installations where capacitor-bank inrush current can greatly exceed 100 times the nominal RMS current. As part of the established ABB UA..RA contactor range, it provides reliable AC-6b switching for demanding reactive-power compensation systems.
The contactor uses early-make auxiliary poles connected to damping resistors to limit the initial current peak when a capacitor stage is energised. After the inrush current has been reduced, the main contacts close and the resistor circuit is isolated, helping protect the main contacts and associated capacitor-bank equipment from excessive switching stress.
With a capacitor-switching capacity of 12.5 kvar at 400–415 V AC and a coil rated for 400–415 V AC at 50 Hz or 415–440 V AC at 60 Hz, the UA16-30-10RA is suitable for automatic power factor correction panels and industrial capacitor banks. Its three normally open main contacts, built-in normally open auxiliary contact and screw terminals support dependable control-panel integration.
Capacitor banks can draw extremely high transient currents when energised, particularly when a correction stage is connected in parallel with capacitors that are already charged. The ABB UA16-30-10RA limits this initial current through its early-make resistor circuit before transferring the load to the main contacts.
The capacitors must be discharged before reconnection, with a maximum residual voltage of 50 V across their terminals. The contactor is designed for capacitor switching without additional inductances, making it suitable for automatic correction panels configured in accordance with ABB’s application requirements.
| Manufacturer | ABB |
|---|---|
| Series | UA..RA Capacitor Contactors |
| Model | UA16-30-10RA |
| Order code | 1SBL181024R8610 |
| Product type | Capacitor-switching contactor with damping resistors |
| Utilisation category | AC-6b |
| Main contacts | 3 NO |
| Auxiliary contacts | 1 NO |
| Rated operational power at 230–240 V | 8 kvar at 40 °C |
| Rated operational power at 400–415 V | 12.5 kvar at 40 °C |
| Rated operational power at 440 V | 15 kvar at 40 °C |
| Rated operational power at 500–550 V | 18 kvar at 40 °C |
| Rated operational power at 690 V | 22 kvar at 40 °C |
| Rated operational voltage | Up to 690 V AC |
| Rated control voltage at 50 Hz | 400–415 V AC |
| Rated control voltage at 60 Hz | 415–440 V AC |
| Inrush-current control | Early-make auxiliary poles with damping resistors |
| Connection type | Screw terminals |
| Weight | 0.460 kg |
This contactor switches capacitor banks in power factor correction systems where the peak energisation current can greatly exceed 100 times the nominal RMS current.
The UA16-30-10RA is rated for 12.5 kvar at 400–415 V AC and 40 °C.
Early-make auxiliary poles initially connect the capacitor bank through damping resistors before the three main contacts close and carry the load.
Its coil is rated for 400–415 V AC at 50 Hz or 415–440 V AC at 60 Hz.
Yes. ABB specifies that the capacitors must be discharged to a maximum residual terminal voltage of 50 V before they are re-energised.
ABB UA..RA capacitor contactors provide controlled inrush-current switching for panel builders, electrical engineers and industrial operators developing dependable power factor correction systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...