What this MCB is and where it fits
The Siemens SENTRON 5SY4508-7CC11 is a 2-pole miniature circuit breaker (1P+N) rated 8 A with a C tripping characteristic, designed for 230 V AC circuits. Its 10 kA breaking capacity per EN 60898 means it safely interrupts short-circuit faults up to that level on a 230 V line, protecting downstream wiring and loads in industrial control panels or distribution boards. The C-curve (5–10× In) handles moderate inrush from motor starters, contactor coils, or small transformers without nuisance tripping.
Key ratings and what they mean for your panel
The C tripping characteristic is the standard choice for general-purpose industrial loads — it holds through the 5–10× In magnetic trip zone, so a motor starting at 40 A for 100 ms won't pop it, but a hard short will clear fast. Energy limiting class 3 means it restricts let-through energy on a fault, reducing stress on downstream components and busbars. Rated for overvoltage category III (fixed installation), this MCB is suitable for permanent connection in distribution panels where transient overvoltages from the mains are expected. The IP20 rating applies with connected conductors — fine inside a closed enclosure; not for wet or washdown areas without an outer cabinet. Ambient temperature range of -40 to +70 °C covers most indoor industrial environments, including unheated warehouses or near ovens. Humidity derating is specified: max 95% RH at 55 °C, dropping to 55% at 70 °C and 35% at 75 °C — relevant if the panel sits in a humid plant near steam or washdown zones.
Mounting and wiring notes
Snaps onto a standard DIN rail — any mounting position allowed. Installation depth is 70 mm behind the panel surface; overall depth 76 mm. The screw-type terminals accept 0.75–35 mm² solid or stranded wire; tighten to 2.5–3.5 N·m. The neutral pole is switched (1P+N), so this breaker disconnects both line and neutral on a fault — required for single-phase final circuits in many IEC markets. Sealable with a lockout tagout hasp. Touch protection is built in (finger-safe terminals when wired). Combined terminals top and bottom accept the incoming feed and outgoing load.