What it is and what it does
The Siemens 5SL4325-7RC is a SENTRON miniature circuit breaker — a 3-pole, C-curve unit rated 25 A at 415 V AC with a 10 kA breaking capacity per EN 60898. That 10 kA figure means it can safely interrupt a fault current up to 10,000 amps, which covers the vast majority of residential and light commercial distribution boards. The C-curve (tripping between 5 and 10 times rated current) is the standard choice for general-purpose loads like lighting, socket outlets, and small motor circuits where you need moderate inrush tolerance without nuisance trips.
Panel fit and integration
At 18 mm wide (1 MW), this breaker snaps onto a standard DIN rail and occupies a single modular slot. Installation depth is 70 mm, so it clears a 76 mm deep enclosure back wall with a few mm to spare for wiring. Mounting position is unrestricted — any orientation works. The IP20 rating (with connected conductors) is typical for enclosed distribution boards; it's not rated for washdown or outdoor exposure. Sealable terminals are provided for anti-tamper requirements.
What the ratings mean for the buyer
The 2.92 W power loss per pole at rated current adds up to about 8.8 W total for the 3-pole unit — worth factoring into enclosure thermal calculations if the board is densely populated. Energy limitation class 3 means it limits let-through energy effectively, reducing stress on downstream components during a fault. The -40 °C to 75 °C operating range covers unheated utility rooms and outdoor enclosures in most climates. Halogen-free and silicon-free construction matters for sensitive environments like clean rooms or areas with corrosion-sensitive contacts.