What the ratings mean for fit
The 3VA1110-3EF36-0AH0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current (Iu) at 40 °C, with a 3-pole configuration and a TM240 thermal-magnetic trip unit — meaning the thermal element is fixed at 240 A short-circuit pickup, and the magnetic instantaneous trip is non-adjustable. This is a line-protection version, not a motor-protection or ground-fault variant, so it's sized for feeder or distribution circuits where you need overcurrent and short-circuit protection in one device. Breaking capacity is voltage-dependent: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. At 415 V — common in European industrial panels — the 52.5 kA rating comfortably handles most transformer-fed fault currents below that threshold. The 690 V figure (10.5 kA) is the limiting case; verify your available fault current at that voltage before specifying. Thermal derating is published per the datasheet: the breaker holds 100 A from 40 °C through 50 °C, then steps down to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel ambient runs above 50 °C, the continuous load must be reduced accordingly — the 90 A floor at 70 °C is the worst-case limit.
Panel integration and mounting
Footprint is 76.2 mm wide, 130 mm tall, 70 mm deep — a standard 3-pole MCCB envelope that fits most DIN-rail or screw-mount panel layouts. The IP40 rating on the front means the breaker face is protected against solid objects over 1 mm (tools, wires), but not sealed against moisture; it's suitable for indoor control panels, not washdown environments. Auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ version), which gives you separate signaling for breaker position and fault status — useful for remote monitoring or PLC inputs without adding external relays.