The Siemens SENTRON 3VA2125-7HK46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current across the full operating temperature range of -40 °C to 70 °C — no derating needed from 40 °C through 70 °C, which simplifies panel sizing in hot environments like switchgear rooms or outdoor enclosures. Breaking capacity hits 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 53 kA at 690 V — numbers that place this squarely in high-fault-duty applications like industrial main feeders or transformer secondaries where upstream SCCR demands serious headroom. Fitted with an ETU340 electronic trip unit, adjustable N-conductor protection (OFF or 100%), and a fixed long-time delay of 1300 s at tr max/min — a line-protection MCCB, not a motor-protection device, so it's sized for cable and busbar protection in distribution panels.
What the ratings mean for fit
The 800 V rated insulation voltage (Ui) confirms this MCCB is rated for 690 V systems with margin — common in 480/277 V and 600 V North American panels, and standard for 400/690 V European industrial grids. IP40 on the front means it's protected against tools and solid objects larger than 1 mm, but not sealed against moisture — install in a dry enclosure or a panel with a higher-rated door. Mechanical endurance of 20,000 cycles (latching) suits fixed installations where the breaker sees infrequent switching — not a daily disconnect switch for motor starting. Maximum power loss of 0.6 W per pole is negligible for thermal management in densely packed panels — no forced cooling needed around this unit.
Lifecycle and sourcing reality
Sourced and quoted to order against an RFQ through independent distribution — availability and current pricing confirmed at quote time. No official successor order code exists; the 3VA2 platform is the current generation for this class. Panel footprints are consistent across the 3VA2 family, so a 25 A frame shares the same mounting pattern as other ratings in the series.
Panel integration
Dimensions: 181 mm height, 140 mm width, 86 mm depth — fits standard MCCB mounting footprints in Siemens SENTRON distribution boards or generic DIN-rail enclosures with screw-fixed backplates. No communication function onboard — this is a standalone thermal-magnetic (electronic trip) breaker with no Modbus or PROFIBUS interface. For remote monitoring, pair with an external power metering module or a separate communication-capable feeder.