The Siemens 5SU1353-7KV16 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS protector — in a single 1+N-pole module. The 70 mm depth fits standard DIN-rail enclosures; the compact width saves panel space over separate RCD + MCB pairs.
Type A detection covers pulsating DC fault currents and smooth DC up to 6 mA — the minimum for circuits with single-phase rectifiers, switching power supplies, or variable-speed drives. The C16 curve handles moderate inrush — typical for lighting banks, small motor loads, and control transformers — without nuisance tripping on startup.