Siemens 3VA2225-5JQ32-0DL0 — SENTRON MCCB, 250 A, 3-Pole
The Siemens 3VA2225-5JQ32-0DL0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 250 A at 40 °C and an adjustable thermal-magnetic trip range from 50 A to 250 A. The 3-pole design fits standard 3-phase distribution panels, and the built-in undervoltage release (UVR) drops the breaker if control voltage is lost — a common requirement for emergency-stop circuits.
The 250 A rating holds flat from 40 °C to 50 °C, then derates to 200 A at 70 °C — so in a warm enclosure you lose 50 A of headroom. The adjustable trip (50–250 A) lets you match the breaker to the actual load without swapping hardware, but the full-scale value of 250 A sets the maximum continuous current. The 187 kA SCCR at 240 V is typical for a large service entrance; at 690 V it drops to 4.5 kA, so on 690 V systems this breaker is only suitable for low-fault locations.
The undervoltage release (UVR) is factory-fitted; verify control voltage matches the coil rating before energizing. The maximum power loss of 50.5 W means the breaker contributes noticeable heat — account for it in the enclosure thermal calculation.