ABB UA63-30-00RA 110V 50Hz / 110-120V 60Hz Contactor – 1SBL371024R8400
- Product Name : Contactor
- Poles : 3
- Product Class : Block Contactors
- Voltage : 110-120V AC/DC
- Terminal Type : Screw Terminals
The UA63..RA 3-pole contactors are specifically designed for capacitor switching in installations where peak inrush currents can exceed 100 times the nominal RMS current. These contactors are supplied complete with built-in damping resistors and must be used without any additional inductances (refer to the table below for details). To ensure safe operation, capacitors must be discharged before re-energization, with a maximum residual voltage at the terminals not exceeding 50 V when the contactor is making.
These contactors offer an electrical durability of up to 250,000 operating cycles for voltages below 500 V and 100,000 cycles for voltages between 500 V and 690 V. Each UA..RA contactor includes a specially designed front-mounted block that inserts three damping resistors in series to limit the initial inrush current when energizing the capacitor bank. This configuration also enables precharging of the capacitors, effectively reducing the second current peak that occurs when the main poles close.
By integrating these resistors, the contactor ensures effective damping of extreme inrush currents during switching, regardless of their magnitude. The UA..RA series features a block-type design, includes three main poles, and operates on an AC control circuit with a laminated magnet system. A wide range of compatible accessories is also available to support various installation requirements.
