What it is and what the ratings mean
The Siemens SENTRON 5SL6132-7YA is a 1-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated 32 A at 230/400 V AC, and a breaking capacity of 6 kA per EN 60898. The C-curve means it trips at 5 to 10 times rated current — designed for inductive loads like small motors, pumps, and lighting circuits where inrush current is moderate. The 6 kA breaking capacity tells you it can safely interrupt a fault current up to 6,000 amps without welding contacts or causing arc flash damage downstream, which is standard for residential and light commercial distribution boards.
Where it fits and how it mounts
This MCB snaps onto a standard DIN rail and occupies one modular width unit (18 mm wide, 90 mm tall, 76 mm deep). The 70 mm installation depth leaves room for wiring behind the panel door. It's rated IP20 with the distribution board cover fitted, so it's fine inside an enclosure but not for wet or dusty environments. Mounting position is unrestricted — you can lay it sideways or upside down if the panel layout demands it.
Thermal performance and derating
The 32 A rating holds at 30 °C ambient. At 40 °C the thermal trip element derates the continuous current to 0.93 A — that's not a typo; at 45 °C it's 28.8 A. If your panel runs hot (say near a transformer or in a sun-baked cabinet), you need to account for that derating to avoid nuisance tripping. The operating range spans -40 °C to 75 °C, so cold storage or outdoor installs are fine.