Brand new Auto Cool 55 from The Auto Cool Guy.  The new Auto Cool 55 has Fail Safe, A/C fan speed control and the cool down timer can be turned on or off with a small jumper on the PC board.   The foot print is 4.5 by 5 inches and 2.2 inches in height not including the knob.   This new controller is fused at 60 amps with fixed fuses and rated at 55 amps.   The terminals are heavy duty 1/4 inch brass studs for Fan and Ground.   Terminals for ground and fan are included.

AUTO COOL 55 Pulse width modulated fan controller