What it is and what the ratings mean for fit
The Siemens 5SL1325-7MB is a 3-pole SENTRON miniature circuit breaker with a C-tripping characteristic, rated 25 A at 230/440 V AC, 50/60 Hz. The C-curve (5–10× In magnetic trip) means it handles moderate inrush from motor starters and lighting ballasts without nuisance tripping — the standard choice for general-purpose branch circuits in residential and light commercial infrastructure. The 3 kA breaking capacity per IEC 60947-2 defines its fault-interrupt limit; this is not a high-fault panel breaker — it belongs downstream of a higher-rated upstream device in a coordinated distribution board.
Panel fit and integration
Snap-on DIN-rail mount, 3 modular width units (54 mm wide), 90 mm tall, 76 mm deep with 70 mm installation depth. IP20 with conductors connected — standard for enclosed distribution boards. Mounting position any, so it fits vertical or horizontal busbars. Sealable, halogen-free, silicon-free. Overvoltage category III, pollution degree 2. The 2.9 W power loss per pole at rated current matters for thermal derating in a crowded enclosure — check the total dissipation against your panel's thermal budget.