The Siemens 3VA1010-4ED32-0KH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — the core job being to protect cables and busbars from overloads and short circuits in a distribution panel. Three-pole, rated 100 A continuous at 40 °C, with a breaking capacity of 121 kA at 240 V and 75.6 kA at 415 V. That interrupting rating means it can safely clear a fault up to those levels without the arc flashing over or the breaker rupturing — critical when you're feeding a transformer or a high-fault busway where the available short-circuit current is substantial.
What the ratings mean for fit
The 100 A rating holds flat from 40 °C up to 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If the breaker lives in a hot enclosure — next to a drive, above a transformer — use the 70 °C column for sizing, not the 40 °C number. The 800 V rated insulation voltage (Ui) tells you the internal creepage and clearance are designed for 690 V systems, so it's comfortable on 480 V or 600 V class networks. Physical footprint: 76.2 mm wide (3 inches), 130 mm tall, 70 mm deep. That's a standard MCCB width for a 100 A frame — it clips onto a DIN rail or mounts with screws in a panel. The 70 mm depth means it won't hit the gland plate on a 200 mm deep enclosure, but check clearance for the shunt trip (STL) and auxiliary switch wiring exiting the top or bottom.
Built-in auxiliary and release options
Factory-fitted with a shunt trip (STL) release and a configuration of 2 auxiliary switches plus 1 trip alarm switch (HQ). That means you can remote-trip the breaker from an E-stop or a PLC output, and get status feedback — open/closed and tripped — back to the control system. No undervoltage release on this variant, so if you need UVR for a safety circuit, this isn't the order code. The trip indicator and voltage trigger are present, giving a local mechanical flag and a voltage signal when the breaker trips.