Square D J250R Circuit Breaker Enclosure Brand: Square D. Part Number: J250R. Square D, J250R, Circuit Breaker Enclosure, 6.28 in Width, 14.47 in Depth, 31.05 in Height, NEMA 3R NEMA Rating, A/H/J Frame, 2/3 Pole, 15 to 250 A Electrical Rating, Surface Mounting, Steel, Powder Coated, Gray. Additional Description: SQD -J250R CIRCUIT BREAKER ENCLOSURE 3R. Catalog Description: Circuit breaker enclosure, PowerPacT H/J, 15A to 250A, NEMA 3R, 14.47in W x 31.05in H x 6.28in D..