SENTRON 3VA1125-5ED22-0AA0 — 25 A, 2-Pole MCCB with TM210 Release
The Siemens SENTRON 3VA1125-5ED22-0AA0 is a 2-pole molded case circuit breaker (MCCB) rated at 25 A continuous current, designed for line protection in distribution panels and switchgear. It uses a TM210 thermal-magnetic overcurrent release — the thermal element handles overloads, the magnetic element clears short-circuits. The interrupting capacity is 187 kA at 240 V AC and 121 kA at 415 V AC, meaning it can safely clear a fault up to those levels without rupturing or welding contacts — critical for high-fault-current installations like transformer secondaries or large motor control centers.
Ratings and What They Mean for Fit
Rated current holds at 25 A from 40 °C through 50 °C ambient, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C. In a hot panel — say, next to a transformer or in a non-ventilated enclosure — the 23 A limit at 70 °C is the number to use for your load calculation, not the 25 A nameplate. Operating voltage is 415 V AC or 250 V DC; insulation voltage is rated 500 V. The front face carries IP40 protection — splash-protected on the front, but the terminals are not sealed, so mount it inside a panel, not in a washdown zone. Power loss is 5.66 W maximum — negligible for thermal budgeting in a populated panel, but worth noting if you're packing several breakers into a small enclosure. Dimensions are 70 mm deep, 50.8 mm wide, 130 mm tall — a standard 2-pole MCCB footprint that fits most DIN-rail or panel-mount bases in the SENTRON range.