Munro BrainBox - Thermal Protection

Munro BrainBox - Thermal Protection

Our rainwater harvesting control box with thermal protection feature. Protect your pump from amperage overload!

  • Provides the pump motor with thermal overload protection, even when the motor itself does not.
  • Auto-resets upon cool-down.
  • Available 3 hp and above.

Use custom pump control worksheet to specify units larger than 5 hp.

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.

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
  • UL-50 Type 3R listed enclosure – approved for outdoor use, available in stainless steel or powder coated blue**


  • 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 Thermal Protection Horepower Hertz Line Voltage Phase Model Number
24 Blue 2 Yes 3 60 220 1 MBRB2423
Stainless MBRB2423S
Blue 5 MBRB2425
Stainless MBRB2425S