MCCB with ETU550 — line protection for high-fault panels
The Siemens 3VA2025-8JP46-0AA0 is a SENTRON molded case circuit breaker (MCCB) in the 3VA2 series, configured for line protection with an ETU550 electronic overcurrent release. It carries a rated continuous current Iu of 25 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel layout in warm enclosures. The 4-pole design handles three-phase plus neutral, with N-conductor protection adjustable from OFF through 40 % to 160 % of the phase setting, so it adapts to both solidly-grounded and impedance-grounded systems. Breaking capacity is the headline number here: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and still 53 kA at 690 V. Those figures mean this breaker can interrupt a fault current up to those levels without welding contacts or venting plasma — critical for panels fed by large transformers or close to the utility service entrance. The ETU550 release provides adjustable long-time (tr from 0.5 to 25 s), short-time, instantaneous, and ground-fault protection curves, giving the selectivity engineer room to coordinate with downstream feeders.
Panel fit and footprint
The 3VA2025-8JP46-0AA0 measures 86 mm deep, 140 mm wide, and 181 mm high. That 140 mm width is a standard 4-pole MCCB footprint — it occupies the same DIN-rail or mounting-plate pitch as other 3VA2 4-pole frames, so a panel laid out for a 3VA2025-8JQ42-0AA0 accepts this unit without drilling new holes or shifting bus bars. Front IP40 protection means the breaker face is sealed against tools and wires, but the sides and back rely on enclosure protection; mount it in a minimum IP40 cabinet.
Compliance and documentation
The SENTRON 3VA2 series is designed to meet IEC 60947-2 and UL 489 standards for molded case circuit breakers. The manufacturer provides RoHS and REACH declarations, along with IEC/UL certification documentation. The rated insulation voltage Ui is 800 V, and the storage temperature range spans -40 °C to 80 °C, covering most warehouse and transport conditions.