What this 250 A SENTRON MCCB does on the line
The Siemens SENTRON 3VA2225-5HN42-0DH0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, designed for line protection in distribution panels. It carries a 187 kA interrupting capacity at 240 V AC, which drops to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 4.5 kA at 690 V — so the SCCR headroom is substantial on 480 V or 600 V class systems, but verify the available fault current at your specific voltage. The breaker includes an undervoltage release (UVR) and is fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ), which gives you status feedback for PLC or SCADA without an add-on module.
Sizing and thermal derating for panel builders
The breaker holds its full 250 A rating from 40 °C through 50 °C ambient. Above that, it derates linearly: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel ambient runs hot — say, near a drive cabinet or in a poorly ventilated enclosure — plan for the derated figure, not the nameplate. The unit measures 181 mm high, 140 mm wide, and 86 mm deep, which is a standard SENTRON 3VA footprint for this frame size. Mounts on a DIN rail or panel-mount with the appropriate adapter. Maximum power loss is 50.5 W, so factor that into your enclosure thermal budget.
Auxiliary configuration and what ships with the breaker
The order code 3VA2225-5HN42-0DH0 includes the basic switch variant 3VA2225-5HN42-0AA0, plus an undervoltage release (UVR) and a factory-fitted auxiliary switch block with 2 auxiliary contacts and 1 trip alarm contact (HQ designation). No ground-fault monitoring module is included — that would be a separate add-on. The UVR trips the breaker when control voltage drops below a set threshold, which is standard for emergency-stop or undervoltage protection schemes. No communication function is built in; status is available only through the hardwired auxiliary contacts.