Munro BrainBox

Munro BrainBox

 Rain Harvest Control Box

Using a series of float control switches, the BrainBox monitors the water level in a holding tank. If there is sufficient held water to feed the pump when the start signal is received, the pump will pull the water from the tank. If there is not enough water available, the BrainBox opens an alternate water source – domestic or secondary water supply. This secondary source can be plumbed into the system directly or can be used to maintain a minimum level in the holding tank. Available for use with 110v and 220v line voltage,
single phase*.

Rainwater harvest controls do not have to be complicated!

  • A preset pressure sensor alerts the control system of potential pump damage due to loss of prime or run-dry caused by a clogged filter.
  • A temperature sensor offers additional protection for pump and pipework in the case of dead head or a solenoid valve not opening.
  • Float controls are wired for 24v reduced external voltage, which is safer if people or pets could come in contact with external sensors or switches.


  • Dimensions – 12”x12”x6”
  • Color-coded wiring
  • NEMA 3R UL listed enclosure – available in stainless steel or powder coated blue or grey**


  • UL listed
  • Electrical Rating: 120v/240v – 24/28FLA
  • Largest motor – 110v – 2hp 220v – 5hp


  • Low pressure sensor – fixed at 20 psi
  • High temperature sensor – fixed at 105 ĚŠ
  • Float control – 13 amp @ 120/240 VAC with 16 AWG cord


Signal Voltage Enclosure Color No. of Floats Hertz Line Voltage Phase Model Number
24 VOLT BLUE 1 60 110/220 1 MBRB241
24 VOLT 2 110/220 MBRB242

*Low incoming amperage and three phase options available through custom section, page 91.

** Add “G” (Grey) or “S” (Stainless) or “T” to add an optional high-temperature protection, to end of part number.