SENTRON 3VA1125-5GD46-0AA0 — 25 A 4-Pole MCCB with TM210 Release
The Siemens 3VA1125-5GD46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated at 25 A continuous, configured as a 4-pole unit for three-phase plus neutral line protection. The TM210 thermal-magnetic release provides fixed overload and short-circuit protection curves — no interchangeable trip units, which simplifies specification for standard distribution panels. Breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. For audit purposes, the rated insulation voltage is 800 V, and the front face carries IP40 protection — suitable for enclosed panel mounting where the breaker is not exposed to washdown or dust ingress.
Thermal Derating and Operating Envelope
The 25 A rating holds at ambient temperatures up to 50 °C. Above that, the breaker derates linearly: 24 A at 55 °C and 60 °C, then 23 A at 65 °C and 70 °C. The operating temperature range is -25 °C to +70 °C; storage range extends from -40 °C to +80 °C. Maximum power loss at rated current is 8.5 W — relevant for thermal budgeting in densely packed enclosures.
Physical Fit and Panel Integration
Dimensions are 101.6 mm wide (4 in), 130 mm tall (5.12 in), and 70 mm deep (2.76 in). The 4-pole width is the critical dimension for panel layout — standard Siemens SENTRON 3VA mounting accessories and busbar systems apply. No undervoltage release, no voltage trigger, and no communication function are fitted on this variant; the trip indicator is also absent, so fault indication relies on external annunciation or the breaker handle position.