The ABB S202-B16 is a 2-pole miniature circuit breaker rated 16 A with a Trip Curve B characteristic, meaning it trips at 3 to 5 times rated current — designed for resistive or light inductive loads where inrush is low, like lighting circuits or control transformers. Rated for 277 VAC (line-to-neutral on a 480Y/277 V system) and carries a 6 kA interrupting rating at that voltage, so it safely clears faults up to 6 kA without upstream cascading — typical for branch-circuit protection in commercial panels. Mounts on standard DIN rail, drops into the same footprint as other System pro M compact breakers — no panel rework if swapping from a C-curve sibling.
How it sits against the closest sibling
The S202M-C16 shares the same 2-pole DIN-rail footprint and 16 A rating but uses a Trip Curve C (5 to 10 times In), which handles moderate inrush from small motors or capacitive loads. If your BOM specifies Curve B for resistive loads, the C-curve version may nuisance-trip on startup — stick with the S202-B16 unless the load profile changes.