What it is and what it does
The Siemens 3VA2025-8HL36-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) designed for line protection — the primary overcurrent and short-circuit safeguard on a feeder or distribution branch. It carries a continuous current rating of 25 A and is built around the ETU320 electronic trip unit, which provides adjustable overload and short-circuit protection curves without the thermal drift of a bimetal. Three poles handle three-phase circuits, and the 800 V rated insulation voltage covers 400 V and 480 V distribution panels with headroom.
Breaking capacity — what the numbers mean for your fault level
This breaker's interrupting rating is 440 kA at 240 V AC, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. Those are the maximum fault currents it can safely clear at each voltage level. In a 480 V panel with an available fault current of 200 kA, this breaker is comfortably within its 330 kA rating at 440 V — no need to cascade an upstream current-limiting fuse. At 690 V the rating drops to 52.5 kA, so verify your system's prospective short-circuit current if you're feeding a 690 V drive bus.
Panel fit — dimensions and mounting
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most 600 V panelboards and enclosure backplates without crowding adjacent poles. Front-face protection is IP40, meaning it's sealed against tools and wires >1 mm but not against water ingress; mount in a dry indoor enclosure or a weatherhead with a gasket. The ETU320 trip unit is field-adjustable via rotary dials on the front, so you can set the long-time pickup and short-time pickup without pulling the breaker.