What this MCCB carries and where it fits
The Siemens 3VA2325-5HN32-0DA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, 3-pole, with a continuous current Iu of 250 A at 40 °C. That 250 A holds flat through 50 °C — you only start seeing derating at 55 °C (240 A) down to 225 A at 70 °C, so it's a solid pick for a warm panel or outdoor enclosure where ambient climbs. The interrupting ratings are the headline here: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That's serious fault-clearing capacity for a 250 A frame — it handles high available fault current at the service entrance or on a large motor control center bus without needing a current-limiting fuse upstream. The overcurrent release is an ETU350 — that's a basic electronic trip unit with LSI curves (long-time, short-time, instantaneous). No ground-fault monitoring, no communication module, no phase-failure detection. It's a workhorse MCCB for standard distribution and motor feeder protection where you don't need the bells of a 3VA2 with a 3VA9 communication module. The built-in undervoltage release (UVR) means it drops out on loss of control voltage — typical for emergency-stop chains or undervoltage protection schemes. No auxiliary contacts are included on this variant; if you need status feedback, you'll add them separately.
Physical fit and panel integration
Footprint is 138 mm wide, 248 mm tall, 110 mm deep. That's a standard 3VA2 frame size — it bolts into the same mounting pattern as other 250 A SENTRON MCCBs. No DIN-rail mount on this class; it's fixed by four screws to a backplate or busbar system. The 110 mm depth means it clears most 200 mm deep enclosures with room for rear bus connections and cable bending radius. Wireway planning: at 250 A you're looking at parallel runs of 70 mm² or 95 mm² copper, so leave at least 150 mm clearance below the breaker for cable sweep.
What the ratings mean for selectivity
The 187 kA at 240 V is the maximum breaking capacity — it tells you this breaker can safely interrupt a fault up to that level without welding contacts or rupturing. In practice, for selectivity coordination downstream of a larger feeder, you'd look at the short-time withstand and the ETU350's adjustable I²t curves. The 121 kA at 415 V is the figure most European 400 V panels care about; the 17 kA at 690 V is the ceiling for 690 V industrial networks. The 800 V rated insulation voltage (Ui) confirms it's designed for 690 V systems with margin.
Endurance and thermal budget
Mechanical endurance is 15,000 operations — that's typical for a 250 A frame MCCB used in distribution, not for frequent switching duty. If you're cycling this breaker daily as a disconnect, you'll wear it out faster than the 15k cycles. The maximum power loss is 40 W at rated current; that's heat that has to be dissipated inside the enclosure. In a sealed panel with multiple breakers, factor that into the thermal calculation — 40 W per pole is 120 W total for this 3-pole unit at full load.