Integrator's terse spec recap
The Siemens 3VA2125-5HN36-0AA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current across the full -25 °C to 70 °C operating range — no derating needed up to the maximum ambient. The ETU350 electronic trip unit handles line protection (overload and short-circuit) with adjustable settings, though this variant ships with a fixed 25 A rating. Breaking capacity hits 187 kA at 240 V AC and 121 kA at 415 V / 440 V, dropping to 75.6 kA at 500 V and 3.7 kA at 690 V — the 690 V figure is low, so verify SCCR at that voltage if your panel runs a 690 V bus. Rated insulation voltage is 800 V. Front IP40 protection; no communication function, no undervoltage release, no ground-fault monitoring on this order code.
Mounting & panel fit
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. Standard DIN-rail or screw-mount base; 3-pole footprint matches the SENTRON 3VA2 family. No communication module or auxiliary voltage trigger on this variant — pure line-protection MCCB. Panel cutout and gland planning should account for the 86 mm depth plus wiring clearance for 25 A rated conductors.