What it is and what it does
The Siemens SENTRON 3VA1110-5GE46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 100 A continuous at 40 °C, with a TM220 thermal-magnetic trip unit. It is a line-protection device — meaning it protects cables and busbars from overload and short-circuit, not motor or generator circuits. The 4-pole construction (three phases plus switched neutral) makes it suitable for three-phase systems where the neutral must be disconnected and protected alongside the phases.
Breaking capacity — the real-world fault current it can interrupt
This breaker's interrupting capacity varies sharply with system voltage: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 187 kA figure at 240 V is exceptionally high — typical for large secondary-side transformer feeds or high-fault industrial panels. At 690 V the 17 kA rating is still adequate for most motor-control-center lineups. The 800 V rated insulation voltage confirms the breaker's internal clearances are designed for 690 V systems with margin.
Thermal current and ambient derating
The 100 A rating holds flat from 40 °C up to 50 °C. Above that the TM220 release begins to derate: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. In a sealed, uncooled enclosure near other heat sources, plan for the 70 °C column. The maximum operating ambient is 70 °C; storage range is -40 to 80 °C.
Physical fit and panel integration
The breaker measures 101.6 mm wide, 130 mm high, and 70 mm deep. The 4-pole width (101.6 mm) is standard for a 100 A frame in the SENTRON 3VA platform. Front IP40 protection means it is suitable for enclosed panel mounting but not for washdown or outdoor exposure. No undervoltage release, no voltage trigger, no communication module — this is a plain thermal-magnetic breaker with no auxiliary electronics.