What it is and what it does
The Siemens SENTRON 3VA1110-3EF32-0AE0 is a 3-pole molded case circuit breaker (MCCB) rated 100 A at 40 °C, designed for line protection in distribution panels and industrial switchgear. Its TM240 thermal-magnetic release provides fixed overload and short-circuit protection, with a rated insulation voltage of 800 V and a maximum power loss of 25 W. Breaking capacity reaches 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — figures that define the available fault current it can safely interrupt without upstream coordination failure.
Sizing and thermal derating
The breaker holds its full 100 A rating up to 50 °C ambient; above that it derates linearly to 91 A at 70 °C, which matters when the breaker sits in a crowded, poorly ventilated enclosure. At 55 °C it carries 98 A, at 60 °C it carries 96 A, and at 65 °C it carries 94 A — a gentle slope that buys headroom in warm panels without oversizing the frame.
Panel fit and auxiliary wiring
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a compact 3-pole footprint that fits standard MCCB mounting patterns in distribution boards and motor control centers. The breaker accepts up to four auxiliary switches (HQ design), letting you wire status feedback to a PLC or indication lamp without an external interface.