The Edco MPA-303 Series is a modular device intended for use on traffic control load relay outputs. The Edco MPA-303-9 unit will protect six output circuits. The Edco MPA-303-6 unit will protect four output circuits.
The Edco MPA-303-9 is designed for any traffic controller cabinet equipped with 9 position, 5.08 mm spacing sockets wired in line with load relay outputs. The Edco MPA-303-6 is designed for 6 position, 5.08 mm spacing sockets.