What this MCCB is and what it does
The Siemens SENTRON 3VA2125-6HK46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, configured as a line protection device. It uses an ETU340 electronic trip unit, which gives adjustable N-conductor protection (OFF or 100% setting) and a fixed long-time delay (tr) of 1300. This is a panel-mount breaker for distribution boards and motor control centers where you need high interrupting capacity in a compact footprint.
Breaking capacity — what the numbers mean for your fault level
This MCCB carries a 242 kA breaking capacity at 240 V, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 42 kA at 690 V. Those are the maximum fault currents it can safely interrupt at each voltage level. For a 480 V panel, the relevant figure is the 187 kA at 440 V (the closest published point) — that's well above typical utility fault levels, meaning this breaker handles high-capacity transformer feeds without cascading upstream. The 42 kA at 690 V is relevant for 600 V class industrial systems.
Thermal derating and operating range
Rated current holds at 25 A from 40 °C all the way to 70 °C ambient — no derating needed across that span. That's unusual for a 25 A MCCB; many competitors start derating above 40 °C. The operating temperature range is -40 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is 0.6 W, negligible for panel thermal budgeting.
Physical fit and panel integration
Dimensions are 86 mm deep, 140 mm wide, 181 mm high. The 140 mm width for a 4-pole frame is standard for SENTRON 3VA2 breakers — it fits the same DIN-rail or screw-mount footprint as other 3VA2 4-pole units. Front protection is IP40, so it's suitable for enclosed distribution boards where no water ingress is expected. No communication function or ground-fault monitoring on this variant.
Lifecycle and sourcing posture
The lifecycle stage is marked as current — this is an active, in-production catalog number from Siemens. No end-of-life notice or last-time-buy date is associated with this code. For BOM freeze or PCN watch, this part is stable. Availability and current pricing are confirmed at quote time against an RFQ through independent distribution channels.