CIRCUIT-BREAKER VL 1250N STANDARD SWITCHING CAPACITY ICU=50KA / 415 V AC 4 POLE, LINE PROTECTION OVERCURRENT RELEASE ETU20, LSI IN=1250A, RATED CURRENT IR=500-1250A, OVERLOAD ISD=1,5TO9XIR, II=10XIN SHORT-CIRCUIT N NOT PROTECTED UNDERVOLTAGE RELEASE 277 V AC AUXILIARY/ALARM SWITCH KIT 2HS(1NO+1NC)+1AS(1NO)