DIY installation instructions are included in the box.
Circuit Breaker, NA GFSI Series, 40A, 2 Pole, 120/240V AC The primary color of this product is black and it comes with black hardware. THE GFCIS PRIMARY FUNCTION IS TO SWIFTLY DETECT IMBALANCES IN CURRENT BETWEEN THE HOT AND NEUTRAL WIRES, INSTANTLY INTERRUPTING THE CIRCUIT IF ANY DISPARITY IS IDENTIFIED.