The Siemens SENTRON 3VA2025-4HL42-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current across the full ambient range from 40 °C to 70 °C — no derating curve to chase. That 25 A holds flat at every temperature step in the operating band, which simplifies panel thermal budgeting for a line-up of breakers in a closed cabinet. Interrupting capacity hits 121 kA at 240 V and 76 kA at 415/440 V, then drops to 53 kA at 500 V and 3 kA at 690 V. The 121 kA figure at 240 V covers high-fault utility or transformer-secondaries; the 76 kA at 415 V is the number most plant-floor distribution engineers will check first for IEC 60947-2 coordination studies. It carries the ETU320 electronic overcurrent release with an adjustable time delay tr from 0.5 to 17 s and N-conductor protection configurable as OFF or 100% of the phase rating. That adjustability lets you shape the trip curve to match downstream load inrush without oversizing the breaker. Power loss is only 0.84 W maximum — negligible in a densely packed distribution panel.
Dimensions: 181 mm height, 140 mm width, 86 mm depth. The 4-pole width (140 mm) is the standard 4-module MCCB footprint for this frame size — verify existing panel cutout and busbar centers against those numbers before ordering. No IP rating on the rear or sides; the breaker relies on the enclosure for overall ingress protection.
What the ETU320 release gives you
The ETU320 is a basic electronic trip unit with L (long-time) and I (instantaneous) protection — no ground-fault, no communication, no measurement. The tr adjustment range of 0.5 to 17 s lets you coordinate with downstream feeders or motor-start profiles without a more expensive trip unit.