What this MCCB is and what it carries
The Siemens SENTRON 3VA2325-5HN32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V. It is designed for line protection and includes an undervoltage release (UVR) as the auxiliary release — no auxiliary switch, no ground-fault monitoring, no communication function. That UVR means the breaker trips if control voltage drops below a set threshold, which is standard for emergency-stop or undervoltage protection schemes in motor control centers.
Interrupting ratings across voltages
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. The sharp drop at 690 V tells you this is a 500 V-class frame — at 690 V the available fault current must be limited to 7.5 kA, so it is not suited for high-fault 690 V distribution without upstream current-limiting fuses or a higher-rated breaker.
Thermal performance and panel fit
The breaker holds 250 A continuous across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Maximum power loss is 40 W, which matters for heat buildup in a sealed enclosure. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint that fits most SENTRON mounting plates and panel cutouts. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.