supply testing of 3 pole contactors for capacitor switching 3p ac operated type ua26 30 10r a of abb design main poles and auxiliary contacts 3 main poles with inbuilt surge protection and 1 auxiliary co ntact having no nc control circuit ac operated with laminated magnet circuit the ua ra series contactors fitted with a special front mounted block which ensures the serial insertion of 3 damping resistors into the circuit t o limit the current peak on energization of the capacitor bank as per