Munro SmartBox Pump Start Relay with Motor Overheat Protection | MPLC243

MUNRO MPLC243 BASIC SMARTBOX PUMP START RELAY WITH CODE-COMPLIANT THERMAL PROTECTION & PRESSURE SENSOR FOR 24VAC SPRINKLER TIMERS:

This model is for 3 HP pumps ONLY.

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 water is not available the pressure will drop within the pump and the pressure sensor will signal a time delay to begin counting. If 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 lack of pressure, as long as the pump is able to rebuild and maintain pressure, the pump will be allowed to run normally.

Features & Benefits

• 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 while offering low pressure shut-down protection. Activates shut-down sequence at 20 psi discharge pressure
• MPLC243: For all single phase 3 HP pumps
• Added feature of automatic thermal overload protection - shuts pump down if it starts pulling too many amps
• Heat code number: E60
• Color coded wiring for easy installation
• ALL MUNRO RELAYS & PUMP PROTECTION SYSTEMS ARE UL LISTED as ENCLOSED INDUSTRIAL CONTROL PANELS
• ALL MODELS ARE HOUSED IN NEMA 3R WEATHERTIGHT ENCLOSURES WITH "BAKED-ON" POWDER COATING OR STAINLESS STEEL FOR LONG LIFE IN DIFFICULT ENVIRONMENTS