The Siemens 3VA2325-5HN42-0AJ0 is a SENTRON molded case circuit breaker rated for 250 A continuous current across a 40 °C to 70 °C ambient range — no derating needed up to the full 70 °C mark. Four poles, line protection design, with a trip indicator and two auxiliary switches plus one trip alarm switch built in. Interrupting capacity hits 187 kA at 240 VAC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That 187 kA at 240 V puts it squarely in the high-fault category for North American panelboards where available fault current runs high on the secondary side of a distribution transformer. Maximum power loss is 37.5 W — factor that into enclosure thermal rise calculations if the panel is densely packed.
Integration and mounting
No undervoltage release, no ground-fault monitoring module, no communication function on this variant. If you need shunt trip or UVR, that's a different order code suffix. The auxiliary switch complement (2 aux + 1 trip alarm) is factory-fitted and wired to the terminal block on the breaker face.
What the ratings mean for your panel
The 250 A continuous rating holds flat from 40 °C to 70 °C — no temperature derating curve to calculate. That simplifies panel thermal design: if your enclosure ambient stays under 70 °C, the breaker delivers full rated current. Storage range is -40 °C to 80 °C, operating range -25 °C to 70 °C. Interrupting ratings cover both 240 V and 415/440 V applications — common for panels that ship to both North American and IEC markets. At 690 V the 7.5 kA rating is low; this breaker is not the right choice for a 690 V distribution board with high fault current. The 187 kA at 240 V is the headline number that drives selectivity coordination in high-fault installations.