What this MCCB is and what it does
The Siemens SENTRON 3VA1110-3EF32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 100 A continuously at 40 °C without derating. Its TM240 thermal-magnetic overcurrent release handles the overload and short-circuit trip curves, while the integrated undervoltage release (UVR) drops the breaker if control voltage falls — standard for emergency-stop or undervoltage protection schemes in distribution panels.
Breaking capacity — what the numbers mean for your fault level
This MCCB delivers 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — the interrupting rating drops as voltage climbs, which is typical for a compact-frame MCCB. At 500 V and 690 V it still holds 11.9 kA, enough for most industrial motor-control-center fault levels. The 800 V rated insulation voltage (Ui) means the internal clearances and creepage are sized for 690 V line-to-line systems with margin.
Thermal derating — don't size it at the 40 °C number alone
Rated 100 A at 40 °C, but at 55 °C it's 98 A, at 65 °C it's 94 A, and at 70 °C it's 91 A. If this breaker lives in a crowded panel with other heat sources, use the 70 °C column — that's a 9 % reduction from the nameplate. The maximum power loss of 27.5 W is the heat it dumps into the enclosure; factor that into your thermal budget.
Panel fit and footprint
At 76.2 mm wide, 130 mm tall, and 70 mm deep, this breaker fits the standard SENTRON 3VA compact-frame footprint. The 3-pole body is the same width as the 3VA1 family's 100 A frame, so it drops into existing panel layouts without re-drilling gland plates. No communication module, no ground-fault monitoring — it's a straight line-protection device with undervoltage release.