Schneider Electric,SUPPLEMENTARY PROTECTOR 480Y/277V 4A 4P,-30 to 70.C (-22 to 158.F),2.48 in,3.00 in,3.19 in,4 A,4-Poles,480Y/277V,5 kA @ 480Y/277 VAC,50/60 Hz,DIN Rail Mount,Line Box Lug - Load Box Lug,Multi 9,Multi 9 - C60,Multi 9 - C60N Circuit Breaker,Overcurrent protection within appliances or electrical equipment where branch circuit breaker protection is provided or not required,Relative Humidity 95 at 131.F (55.C),UL Certified, IEC Rated