Main lug loadcenters top feed - surface mount indoor - nema 1 code-gauge steel enclosure 5-1/8 inches width x 9-7/8 inches height x 2-5/8 inches depth amp rating=60 Single phase, 3 wire, solid neutral, 2 spaces and 4 circuits maximum 1-pole, 1 QP breaker maximum 2-pole, 120/240 volt AC. 10,000 AIR. One piece plated aluminum bus bar, heavier main bus for cooler operation, direct cable connection to bus bar. Main lugs and neutral on same plane, same drive tool. 100 percent circuit breaker twistouts.