What the ratings mean for fit
The Siemens SENTRON 3VA2110-5MN36-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for motor protection, carrying a rated continuous current Iu of 100 A and a rated insulation voltage Ui of 800 V. The headline breaking capacity at 240 V is 187 kA, which drops to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 17 kA at 690 V — so the interrupting capability is heavily voltage-dependent. For a 400 V-class motor feeder, the 121 kA figure at 415 V is the one that governs SCCR coordination with downstream contactors and starters. The overcurrent release is an ETU350M electronic unit, which supports adjustable long-time, short-time, instantaneous, and ground-fault protection curves — it's the same platform used across the 3VA2 frame, so settings are familiar if you already have SENTRON breakers in the panel. Phase failure detection is included, which matters for motor protection on unbalanced supplies.
Thermal derating and continuous current
The 100 A rating holds at ambient temperatures up to 50 °C. Above that, derating is gradual: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If the panel ambient runs above 50 °C, the effective continuous current drops — so for a 100 A motor full-load current, you need to verify the enclosure's internal temperature or step up to a higher frame. Maximum power loss is 75 W, which contributes to enclosure heating.
Panel integration
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. It mounts on a DIN rail or can be screw-fixed to a backplate. The 2 auxiliary switches (HQ type) are built in, so you get status feedback without adding external contact blocks. The shunt trip (STL) is factory-fitted — it's a voltage-trigger release that lets a remote signal (e.g., from an E-stop or PLC) trip the breaker. No undervoltage release is present; if you need UVR, this variant doesn't carry it.