What this MCCB brings to the panel
The Siemens 3VA2025-7JP42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for 25 A continuous current, built around the ETU550 electronic trip unit. That trip unit gives you adjustable overload and short-circuit protection curves — not a fixed thermal-magnetic, so you can dial in coordination with downstream breakers without swapping hardware. The interrupting capacity hits 330 kA at 240 V, which means it can clear a bolted fault at the main distribution board without cascading failure upstream. IP40 on the front keeps dust out of the enclosure face; the rest of the breaker lives inside the panel, so no washdown rating needed here.
Sizing and fit into a 4-pole footprint
At 140 mm wide, 181 mm tall, and 86 mm deep, this breaker takes the standard SENTRON 4-pole MCCB slot on a DIN rail or panel-mount plate. The 86 mm depth is the dimension that matters when you're running busbars or cable ducts behind the breaker — verify your gland plate clearance before committing the layout. No undervoltage release or shunt trip on this variant, so if you need remote trip, you're wiring an external relay or picking a different suffix.
What the ETU550 trip unit does for coordination
The ETU550 is an electronic overcurrent release with LSI protection — long-time (overload), short-time (short-circuit with delay), and instantaneous. That means you can set the short-time pickup and delay to coordinate with downstream MCCBs or fuses, avoiding nuisance trips on transformer inrush or motor starting. The 25 A rating holds flat across the full ambient temperature range from -25 °C to 70 °C, so no derating curve to chase in a warm enclosure.
Communication capability
This breaker includes a communication function — the ETU550 supports integration with SENTRON power management systems via the 3VA communication modules. That gives you remote trip indication, load current monitoring, and event logging without adding a separate power meter. If your panel spec calls for digital energy monitoring at the main breaker, this variant saves a DIN slot.