What it is and what it does
The Siemens SENTRON 5SU9353-1KK10 is a 2-pole RCBO — a residual-current-operated circuit breaker that combines overcurrent protection (C-curve, 10 A) with 30 mA AC residual current detection in a single 36 mm wide module. It's rated for 4.5 kA breaking capacity per EN 60898, overvoltage category III, pollution degree 2. The instantaneous design means no intentional delay on fault; the C-curve trips between 5 and 10 times rated current for moderate inrush loads like small motors or lighting circuits.
Where it goes in the panel
Snaps onto DIN rail, 2 modular width units (36 mm), installation depth 70 mm, total depth 77 mm. Mounting position any, supply feed from top or bottom. IP20 with conductors connected — standard for enclosed distribution boards. Neutral conductor is switched internally, so no separate neutral bar needed for the protected circuit.
Key ratings and what they mean for fit
Rated 10 A at 30 °C ambient, C-curve. The 30 mA residual trip covers basic shock protection for AC circuits — typical for socket-outlet circuits in residential and light commercial panels. Breaking capacity 4.5 kA per EN 60898 is the standard domestic rating; for industrial panels with higher prospective fault current, check the upstream device coordination. Surge current withstand 1 kA (8/20 µs) and insulation voltage 264 V. Temperature range -40 to 75 °C covers unheated service areas and outdoor enclosures within the IP20 limit.