Munro SmartBox Pump Start Relay with Pressure Sensor | MPLC24

• Voltage: 110/240V
• Horsepower: 3/4 - 7-1/2
• Warranty: 1 year or 1000 hours of operation

Features & Benefits

A pressure is built up in the volute case and discharge of a pump when it is working. If this pressure does not exist, there is a problem within the pumping system. The SmartBOX monitors this pressure through the use of a pressure sensor located on the discharge side of a pump. At the beginning, or anytime during a zone cycle, if the water is not available the pressure will drop within the pump and the pressure sensor will signal a time delay to begin counting.

If the pressure has not recovered over the timer cycle, the pump shuts down to save itself before damage occurs. The resetting of the pressure sensor is automatic. The next cycle after an electrical signal shut down will have the same opportunity to build pressure. Since the sensor measures a lack of pressure, as long as the pump is able to rebuild and maintain pressure, the pump will be allowed to run normally.

• Completely automatic and hands-free pump protection.
• Bridges the gap between 24-volt lawn controllers and 110/220V pump motors.
• Serves as a pump start relay plus offers pump shut-down protection if the source water is not available.
• One model works for all single-phase pumps from 3/4 HP TO 7-1/2 HP
• Color-coded wiring for easy installation
• All Munro replays & pump protection systems are UL listed as enclosed industrial control panels
• All models are housed in NEMA 3R weather tight enclosures with "baked-on" powder coating or stainless steel for long life in difficult environments

Product Details

SmartBox Protection

• Serves as a Pump Start Relay while offering low-pressure shut-down protection. Activates shut-down sequence at 20 psi discharge pressure
• Switches lawn controller to a domestic water alternative if pump's primary source water is not available

SmartBox – Standard (The Old Stand-by)

SmartBox – Thermal Protection