What the ratings mean for fit
The 3VA1110-4EF36-0CA0: The 36 kA Icu at 415 V tells you this breaker can safely interrupt a fault current up to that level without welding its contacts or rupturing the arc chamber — critical for panels with high available fault current downstream of a large transformer. The adjustable Ir (70–100 A) lets you match the overload protection to the actual load current, so a 75 A motor feeder or an 85 A lighting panel both land on the same breaker with a screwdriver turn. The Ii range of 5–10× In (500–1000 A magnetic pickup) gives flexibility for inrush from motor starters or transformers; set it high enough to avoid nuisance trips on start-up, low enough to clear a bolted fault fast.
Where it fits in the panel
This is a DIN-rail-mount MCCB, sized for a standard 3-pole footprint in a distribution board or motor control center. The clamp terminals accept copper or aluminum conductors up to the frame's rated cross-section — no lug kit needed for most panel builds. The UVR coil draws power from a separate 120-127 V AC control circuit; if that voltage drops below the dropout threshold, the breaker trips, providing undervoltage protection for downstream equipment. Wire the UVR supply through a normally-closed contact from an upstream safety relay if you need a coordinated emergency-off chain.