Overload protection is handled by a TM220 thermal-magnetic trip unit with an adjustable continuous current rating (Ir) from 175 A to 250 A, set by the user to match the downstream load. Short-circuit protection is fixed at Ii = 10 × In, meaning the magnetic trip fires at 2500 A. The N conductor is unprotected — this breaker is configured for a 3-pole plus solid-neutral application, not a fully protected 4-pole scheme.
If your available fault current exceeds 36 kA, you need a higher-class frame (class H or L in the 3VA family) or a fused switch ahead of it. The Ir adjustment range (175 A to 250 A) lets you dial in the overload pickup for a 200 A feeder or a 225 A bus — you are not locked into a fixed rating. The fixed Ii at 10× In means the magnetic trip is not adjustable; if the downstream load has a high inrush (large transformers or capacitor banks), verify that 2500 A instantaneous pickup does not cause nuisance tripping on energization.
Integration notes
It occupies a standard 4-pole width in the panel; the nut keeper kit (included per the OEM variant) simplifies DC bus bar connections on the line side. The unprotected N conductor means the neutral bar passes through the breaker without a pole — verify your system grounding scheme before wiring.