What this 3VA2 frame delivers
The Siemens 3VA2225-7HN32-0BL0 is a SENTRON molded case circuit breaker (MCCB) sized for 250 A continuous duty in a 3-pole configuration, designed specifically for line protection in distribution panels. Its interrupting capacity reaches 330 kA at 240 V AC and 242 kA at 415/440 V AC, dropping to 187 kA at 500 V and 4.5 kA at 690 V — the 690 V figure is the limiting case for high-voltage low-fault installations. The 250 A rating holds flat from 40 °C through 50 °C ambient, then derates linearly to 213 A at 70 °C; the operating range spans -25 °C to +70 °C, with storage from -40 °C to +80 °C. Physical footprint is 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB envelope that fits most Siemens SENTRON panelboard and switchboard cutouts without adapter plates.
Auxiliary and release options built in
Factory-fitted auxiliary switch complement is 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch (HQ type), giving five discrete signal paths for status feedback to a PLC or annunciator panel. An undervoltage release (UVR) is integrated — when control voltage drops below the dropout threshold, the breaker trips instantly, meeting machinery safety isolation requirements without an external shunt-trip relay. Maximum power loss at rated current is 50.5 W; factor this into enclosure thermal rise calculations when grouping multiple breakers in a single panel.