Integrator note — S202-K20
The ABB S202-K20 is a 2-pole supplemental protector from the S200 series, rated 20 A with a K-Curve trip characteristic and a 6 kA interrupting capacity at 277 V AC. The K-Curve means it holds through moderate inrush — think motor starters, solenoid banks, or transformer primaries — without nuisance tripping, but still clears fast on a hard short. It snaps onto a DIN rail, so it drops into any panel that already carries S200 breakers or similar modular gear.
What the K-Curve means for fit
The K-Curve is the deciding factor here. Compared to a C-Curve peer like the S202M-C20 (same 20 A, same poles, same interrupting rating), the K-Curve holds a wider magnetic trip window — typically 8–12x rated current versus 5–10x for C-Curve. That extra headroom matters when the load is a small motor or a bank of contactor coils that draw a brief surge on pickup. If your panel was spec'd around the S202M-C20 and the loads are mostly resistive or general-purpose, the K-Curve will still work, but you lose the tighter protection a C-Curve gives on lighting or heater circuits. For motor or inductive loads, the K-Curve is the better fit.
Panel integration
Snaps onto standard 35 mm DIN rail. Two poles means it occupies two module widths (roughly 36 mm). The line and load terminals accept up to 25 mm² conductor. No busbar adapter needed if you're feeding from a common bus — the S200 busbar system clips directly onto the line side.