This 3-pole molded case circuit breaker from the SENTRON family is rated for 40 A continuous current and delivers a 242 kA breaking capacity at 240 V, dropping to 187 kA at 415 V and 121 kA at 500 V — at 690 V the interrupt rating is 3.7 kA. That wide spread tells you the part is sized for high-fault low-voltage distribution panels, not for 690 V motor circuits. It's a line-protection design, so it guards the feeder, not a specific load.
Panel fit & integration
Mounts into a standard DIN-rail or bolted bus-bar panel — 105 mm width fits a typical 3-pole MCCB slot. No special cutout or adapter plate required for a SENTRON 3VA frame.