Signal Vehicle SB4020 Switch Box Use these deluxe switch boxes to control your Star lightbars or any other functions of your choice. The SB4020 Series features all illuminated switches when in use and the legends are backlit for easy nighttime readability. There is one 40 amp circuit, protected by a relay and self-resetting circuit breaker, and five 20 amp circuits which are individually protected by fuses. The SB4020 is also available with an attached 15 wire harness. Ships complete with legends, mounting bracket, hardware, and instructions. Size: L 4.5" / W 4.63" / H 2.13"