Headline ratings and what they mean for fit
The Siemens 3VA2225-6JQ32-0CH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 250 A at 40 °C and an insulation voltage of 800 V. That 250 A figure holds flat through 50 °C — only at 55 °C does it start to taper (238 A), dropping to 200 A at 70 °C. For a panel that runs warm, the full rating is available up to 50 °C ambient without derating. Breaking capacity is the standout: 242 kA at 240 V, 187 kA at 415 V, 121 kA at 500 V, and still 6 kA at 690 V. The 242 kA figure at 240 V means this breaker handles very high fault currents typical on the secondary side of large distribution transformers — it is not just a feeder breaker; it can serve as a main breaker in a high-fault panel. The 6 kA at 690 V is low relative to the lower-voltage performance, but at that voltage the application is usually motor circuits with lower available fault current.
Trip unit, auxiliaries, and communication
The overcurrent release is an ETU560 electronic trip unit — adjustable long-time, short-time, instantaneous, and ground-fault protection. Ground-fault monitoring uses summation current formation on the L-conductor. The breaker ships with an undervoltage release (UVR) and a 2-auxiliary-switch + 1 trip-alarm-switch HQ auxiliary contact block. Communication function is built in — this variant is ready for integration into a higher-level monitoring system without an external comm module. Dimensions: 105 mm wide, 181 mm high, 86 mm deep. The 105 mm width is a standard 3-pole MCCB footprint for this current class — it occupies three 35 mm DIN spaces. The depth is 86 mm, which fits most standard distribution boards. Mechanical endurance is rated at 20,000 operations.