The Siemens SENTRON 3VA2125-8HL46-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current across the full ambient range of 40 °C to 70 °C — no derating needed up to that ceiling. It carries an ETU320 electronic trip unit with adjustable N-conductor protection (OFF or 100%).
Breaking capacity is the headline: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, 53 kA at 690 V. These are the maximum fault currents the breaker can safely interrupt at each voltage — critical for high-fault panels near large transformers or generators. The 4-pole version handles three-phase plus neutral, with the neutral pole configurable for no protection or full protection.
Mounts in a standard panel or enclosure — dimensions are 181 mm high, 140 mm wide, 86 mm deep. Front IP40 protection means it's suited for dry indoor panels; no washdown rating. The ETU320 trip unit is field-adjustable for long-time delay (tr min 0.5 s to tr max 17 s) and other parameters, so it can be tuned to coordinate with downstream breakers without swapping the unit.