What the 250 A and ETU550 mean for fit
The SENTRON 3VA2225-5JP32-0HH0 is a 3-pole molded case circuit breaker rated for 250 A continuous current Iu — that is the current it carries without tripping under normal conditions. The ETU550 electronic trip unit gives you adjustable overload and short-circuit protection curves, so the breaker can be tuned to the load's inrush profile rather than relying on a fixed thermal-magnetic characteristic. Line protection version means it is set up for feeder or main breaker duty, not motor protection. Breaking capacity is the real selector here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, 5.1 kA at 690 V. At 415 V this handles most industrial distribution fault levels without cascading upstream. The 690 V figure is low — if your system runs 690 V, verify the available fault current stays under 5.1 kA. Temperature derating is published: full 250 A up to 50 °C, then 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, 200 A at 70 °C. If this breaker lands in a non-ventilated enclosure or next to heat-generating gear, the 55 °C row is the realistic planning number.
Auxiliaries and release configuration
Factory-fitted with a shunt trip (STL) release — that is the 3VA9688-0BL30 integrated auxiliary trip. Also carries 2 auxiliary switches plus 1 trip alarm switch HQ. The shunt trip lets you remotely trip the breaker via a control signal, which means this unit is ready for emergency-off or interlock circuits without field-add-on modules. No undervoltage release, no ground fault monitoring, no phase failure detection on this variant. Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is standard for a 250 A frame in the 3VA2 platform — it occupies three 35 mm DIN spaces. Panel cutout and mounting pattern match the other 3VA2 breakers in this frame size.
Lifecycle and sourcing posture
Maximum power loss is 48 W — relevant for enclosure thermal calculations if the panel is densely packed. Operating temperature range -25 °C to 70 °C, storage -40 °C to 80 °C.