The Siemens 3VA1125-4ED16-0AA0 is a 1-pole SENTRON molded case circuit breaker (MCCB) rated 25 A at 40 °C, with a TM210 thermal-magnetic release for line protection. Its interrupting rating hits 75.6 kA at 240 V AC and 9 kA at 415 V AC — the 415 V figure is the one that governs most three-phase panel applications, so size your available fault current against that lower number, not the 240 V headline. Rated insulation voltage is 500 V, and it operates on AC up to 415 V or DC up to 125 V. The TM210 release means the thermal element is fixed at 25 A with a magnetic trip of 10× In (250 A), typical for protecting branch circuits feeding motor starters, control transformers, or distribution sub-feeds in a panel.
Integration & Mounting
At 25.4 mm wide (1 inch) per pole, this single-pole breaker occupies one standard 1-inch module on a DIN rail. Depth is 70 mm, height 130 mm — it drops into a SENTRON distribution panel or any 35 mm DIN-rail enclosure without crowding adjacent breakers. Front face carries an IP40 protection rating — suitable for general indoor panel use where no washdown or dust ingress is expected. Power dissipation is 2.83 W maximum, negligible for thermal budgeting in a populated enclosure.
Derating & Ambient Conditions
Rated current holds at 25 A from 40 °C through 50 °C, then steps down to 24 A at 55–60 °C and 23 A at 65–70 °C. Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. If your panel ambient runs above 50 °C, factor the 1–2 A derating into your load calculation.