The Siemens Circuit Breaker is high quality! Miniature circuit breaker 400 V 6kA, 2-pole, D, 40 A Model product brand name SENTRON product designation Miniature circuit breaker General technical data number of poles 2 number of poles / note 2P tripping characteristic class D mechanical service life (switching cycles) / typical 10 000 circuit-breaker / Design 5SY6CC overvoltage category III degree of pollution 3 Voltage insulation voltage with single-phase operation / at AC / rated value 440 V with multi-phase operation / at AC / rated value 440 V Supply voltage type of voltage AC operational current / at AC / rated value 40 A supply voltage / at AC / rated value 400 V operating voltage at DC / rated value / maximum 72 V supply voltage frequency rated value 50/60 Hz Protection class protection class IP IP20, with connected conductors Switching capacity switching capacity current acc. to EN 60898 / rated value 6 kA Dissipation power loss W / for rated value of the current / at AC / in hot operating state / per pole 3 W Current Tripping residual / rated value / derated current / at 40 Cel 37.6 A suitability for operation Mechanical engineering / industry