The Siemens 3VA1110-5EF36-0AG0 is a 3-pole molded case circuit breaker from the SENTRON family, rated 100 A continuous at 40 °C and carrying a 187 kA interrupting capacity at 240 V — that is the headline number for fault clearing on a low-voltage distribution board. The TM240 thermal-magnetic release handles overload and short-circuit protection for line-feeder duty, and the breaker holds its full 100 A rating up to 50 °C before starting a gentle derating curve: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, 91 A at 70 °C.
Interrupting capacity across voltages
This MCCB's interrupting capacity drops as system voltage rises: 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. That 17 kA floor at 690 V is still high enough for most industrial feeders, but if your fault-current study shows more than 17 kA available at 690 V, this breaker is not the right choice — step up to a higher-rated frame.
Integration notes
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole width (76.2 mm) is standard for a 100 A frame — fits the usual DIN-rail or mounting-plate footprint in a distribution panel. Rated insulation voltage is 800 V, so it is suitable for 480/277 V and 600 V systems with margin. Maximum power loss is 25 W — account for that in enclosure thermal calculations, especially if the panel is densely packed.