The Siemens Circuit Breaker is high quality! Miniature circuit breaker 230/400 V 6kA, 1-pole, C, 40A, D=70 mm Model product brand name SENTRON product designation Miniature circuit breaker General technical data number of poles 1 number of poles / note 1P tripping characteristic class C mechanical service life (switching cycles) / typical 10 000 circuit-breaker / Design 5SY6 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 / with single-phase operation / at AC / rated value 230 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 at DC / acc. to IEC 60947-2 / rated value 15 kA acc. to EN 60898 / rated value 6 kA acc. to IEC 60947-2 / rated value 10 kA energy limitation class 3 Dissipation power loss W / for rated value of the current / at AC / in hot operating state / per pole 3.5 W suitability for operation Mechanical engineering / industry