What this MCCB carries and where it fits
The Siemens 3VA2225-5HL42-0DH0 is a SENTRON molded case circuit breaker rated 250 A continuous (Iu) with an ETU320 electronic trip unit, configured for line protection across four poles. At 240 V it interrupts 187 kA; at 415 V and 440 V that holds at 121 kA, dropping to 75.6 kA at 500 V and 4.5 kA at 690 V — the interrupting capacity scales with system voltage, so the 690 V figure is the one to check if you're on a 690 V line. The thermal derating curve is flat from 40 °C to 50 °C at 250 A, then steps down: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If the panel ambient runs above 50 °C, the continuous current you can pull is lower than the nameplate. Rated insulation voltage Ui is 800 V, and the operating temperature range is -25 °C to 70 °C. The front face carries IP40 protection — fine for a clean indoor panel, not for washdown areas.
Trip unit and auxiliary contacts
The ETU320 is an electronic overcurrent release with a trip indicator. It does not include ground-fault monitoring or a communication function — this is a straightforward line-protection breaker, not a power-monitoring device. It ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type), and includes an undervoltage release. The basic switch assembly is order code 3VA2225-5HL42-0AA0. Maximum power loss is 50.5 W at rated current — a factor for enclosure heat calculations if the panel is tightly packed.
Physical fit
Dimensions are 140 mm wide, 181 mm high, and 86 mm deep. That 86 mm depth is the body only — allow clearance for the rotary handle and cable bends behind the panel. Storage range is -40 °C to 80 °C, so it can sit in an unheated warehouse through winter without issue.