Siemens 3VA1125-4ED32-0AA0 — 25 A MCCB with TM210 Release
The Siemens SENTRON 3VA1125-4ED32-0AA0 is a three-pole molded case circuit breaker (MCCB) rated 25 A continuous at 40 °C, using a TM210 thermal-magnetic overcurrent release — that's a fixed thermal trip with magnetic short-circuit pickup, no adjustment dial. It's designed for line protection in distribution panels, not motor protection or adjustable overloads. Breaking capacity is where this part earns its keep: 75.6 kA at 415 V AC, 121 kA at 240 V AC, and still 11.9 kA at 690 V AC. That 75.6 kA figure at 415 V means it handles high-fault utility feeds without cascading upstream — a common requirement for main or tie breakers in industrial switchboards where the transformer secondary delivers heavy short-circuit current. Rated insulation voltage is 800 V. Front face carries IP40 protection.
Thermal Derating and Panel Fit
The 25 A rating holds flat from 40 °C through 50 °C, then drops to 24 A at 55–60 °C and 23 A at 65–70 °C. If your panel ambient runs above 50 °C, you lose 1–2 A of headroom — factor that into the load calculation, especially when the breaker feeds a subpanel near a heat source like a drive cabinet. Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall. That 76.2 mm width is a standard 3-inch footprint for a 3-pole MCCB in this class — it clips onto a DIN rail or mounts with screws, and the 70 mm depth leaves room behind the gland plate for cable bends. No communication module, no undervoltage release, no ground-fault monitoring on this variant — it's a straight line-protection breaker.