The ABB SH201-C6 is a 1-pole miniature circuit breaker (MCB) from the SH201 series, rated C-curve 16 A at 230 V.
What the C-curve 16 A rating means on the van
The 16 A thermal element handles continuous loads up to that rating; anything sustained above it heats the bimetal and opens the circuit. On a DIN rail, one module wide, it replaces a blown unit or slots into a new distribution board without reworking the busbar arrangement.