What this MCCB delivers
The Siemens 3VA2325-7JQ42-0AA0 is a SENTRON 3VA2 molded case circuit breaker rated for 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Four poles, line-protection version, fitted with the ETU560 electronic trip unit. The interrupting capacity is 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V. That 330 kA figure at 240 V is the number that governs selectivity in high-fault utility or transformer-secondaries; the 690 V rating of 7.5 kA is the practical ceiling for this frame in IEC applications.
Trip unit and protection profile
The ETU560 is an electronic trip unit with adjustable long-time, short-time, instantaneous, and ground-fault protection. The ground-fault monitoring uses summation current formation on the L+N conductor, which means it detects residual current without a separate sensor core — useful in retrofit panels where space for a toroid is tight. Rated insulation voltage is 800 V. Maximum power loss is 37.5 W, which factors into enclosure thermal calculations if the breaker is enclosed.
Panel fit and environment
Dimensions are 248 mm high, 184 mm wide, 110 mm deep. The front face carries an IP40 protection class — suitable for general indoor panel environments but not washdown. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Communication function is built in, and a motor drive option is available for remote switching. The 4-pole format with line protection means it switches all three phases plus neutral, with the neutral pole typically switched but not protected — confirm the neutral protection scheme per your local code.