The Siemens 3VA1110-6GF42-0AA0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous at 40 °C, with the TM240 thermal-magnetic release handling the overload and short-circuit protection curve.
At 55 °C it derates to 98 A, at 60 °C to 96 A, and at 70 °C to 91 A (–). The 70 mm depth and 101.6 mm width fit standard panel-mount cutouts for 4-pole MCCBs in the 100 A frame class, so it drops into existing SENTRON or competitive footprints without re-drilling the gland plate. Maximum power loss is 25 W — that is the heat the breaker dissipates internally at full load.
If the application is a DC bus or battery bank, the manual's DC derating curves apply.
What the peer comparison tells you
The closest functional sibling is the 3VA1110-5ED32-0AA0, which shares the same 100 A frame and 4-pole configuration but carries a different trip unit and lower interrupting capacity. The -6GF42 variant here uses the TM240 release with the 220 kA breaking rating at 240 V, while the -5ED32 typically steps down to a lower SCCR. If the panel was specified around the -5ED32, the -6GF42 will physically fit the same mounting footprint and bus connections — same 70 mm depth, same 101.6 mm width — but the higher interrupting rating may require coordination re-check with the upstream protective device.