The C40V36E400 is a Schneider Electric ComPacT NSX400HB1 molded case circuit breaker (MCCB) with a MicroLogic 6.3 E electronic trip unit. Its 400 A rating at 40 °C sets the continuous current the breaker can carry without tripping in a 40 °C ambient — if your panel runs hotter, you derate per the manufacturer's curve. The 85 kA Icu at 500 V AC means it can safely interrupt a fault current up to 85 kA at that voltage without welding contacts or rupturing the case; that's the interrupting capacity that governs SCCR coordination downstream. The 75 kA Icu at 690 V AC tells you it still holds a high fault rating even on 690 V line-to-line systems, common in heavy industrial distribution.
Deployment context
IP40 protection means it's suited for indoor panel environments where tools or fingers won't contact live parts; IK07 impact resistance handles incidental knocks during maintenance.