ABB UA30-30-10RA 110V 50Hz / 110-120V 60Hz Contactor – 1SBL281024R8410
- Product Name : Contactor
- Auxiliary Contacts : 1 NO
- Poles : 3
- Product Class : Block Contactors
- Voltage : 110-120V AC/DC
- Terminal Type : Screw Terminals
UA30..RA 3-pole contactors are specifically designed for capacitor switching applications where peak inrush currents can exceed 100 times the nominal RMS current. These contactors come pre-equipped with integrated damping resistors and must be used without any additional inductances (refer to the relevant table for details). Before re-energizing, capacitors must be fully discharged, with a maximum residual terminal voltage of ≤ 50 V.
The contactors offer excellent electrical durability—up to 250,000 operating cycles for voltages below 500 V, and 100,000 cycles for voltages between 500 V and 690 V. A dedicated front-mounted block ensures the serial insertion of three damping resistors into the circuit, effectively limiting the current peak during the energization of the capacitor bank. This configuration also facilitates precharging of the capacitors, reducing the secondary current peak that may occur when the main poles close. Regardless of the level, these resistors help suppress the highest inrush currents, ensuring safer and more stable operation.
UA..RA series contactors are of the block type design, featuring 3 main poles and 1 built-in auxiliary contact. The control circuit is AC-operated with a laminated magnet circuit, and a wide range of compatible accessories is available to meet diverse application needs.
