Protection settings and adjustability
The TM220 thermal-magnetic trip unit gives you a continuous current rating (In) of 63 A, with overload protection (Ir) adjustable from 44 A to 63 A via a dial on the front face. That range lets you fine-tune the pickup for cable or busbar ampacity without swapping the breaker body. Short-circuit magnetic pickup (Ii) is fixed at 10 x In (630 A), which is a standard motor-starting curve — it rides through inrush on a 45–50 A motor load but trips fast on a bolted fault.
Terminal connections accept standard copper or aluminum conductors up to the frame's rated cross-section.