Pump Start Relays


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TIP: Check to see what you irrigation controller requires for both signal amps & volts. Match the pump start relay output voltage ( Line ) to the pumps voltage.
TYPICAL IRRIGATION PUMP CONTROLS
Normally a lawn controller is used to signal a start/stop cycle for an irrigation system. This controller signals valves to open or close to direct water flow into a particular pipeline, or zone, in an irrigation system. When a pump is present in the system, a lawn controller’s start/stop signal is also received by a Pump Start Relay (PSR). This PSR interacts with the incoming signal and the power going to a pump, allowing it to follow the same start/stop pattern.

A lawn controller is the most common way to signal a pump start relay. Other signal devices may also be used, including float switches, pressure switches, and toggle switches.

Each start/stop signal will send a specific signal voltage. Most lawn controllers emit 24v signals, while other signal devices often send higher voltage signals. The signal receiver, or coil, of the electrical contactor inside the PSR must match the signal voltage so it will engage the contactor. Once engaged, power is allowed to flow from the breaker box to the pump motor. When the lawn controller no longer sends the signal, the contactor is no longer engaged and the power flow to the pump motor is stopped.

Pump start controls range from a very simple pump start relay to devices that also offer pump protection to shut the pump down before it is damaged. More complex controls may start and stop multiple pumps, accept signals from multiple devices, or maintain constant pressure.

MUNRO PUMP CONTROLS ARE EXCEPTIONAL
• Safe Reduced External Amperage – All control power leaving a Munro box is low amperage rated so that risk to people or pets is minimized.
• UL Listed – Every single component used is tested, approved and certified by Underwriter’s Laboratory to assure safe operation.
• Built tough – UL-50 Type 3R control enclosures are designed to provide protection – available in both Stainless Steel and Powder Coated Steel – to last in all environments.
• Easy to install and maintain – Color coded wire leads make wiring Munro boxes a simple process.

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  1. Munro StartBox - MPSR110
    Munro StartBox MPSR110 - Standard - Pump Start Relay - 110V Coil
    $52.49
    • Manufacturer: Munro • Series: StartBox MPSR Series • MPN: MPSR110 • Coil: 110V • Control / Signal Voltage: 110V • Pump / Line Voltage: 110V • MAX HP ( @ 110V ): 2 HP • UL-50 Type 3R Listed Enclosure • Enclosure Size: 6" x 6" x 4" Click here for more details
  2. Munro StartBox
    Munro StartBox MPSR24 - Standard - Pump Start Relay - 24V Controller
    $52.49
    • Manufacturer: Munro • Series: StartBox MPSR Series • MPN: MPSR24 • Coil: 24V • Control / Signal Voltage: 24V • Pump / Line Voltage: Either 120V or 240V • MAX HP ( @ 120V ): 2 HP • MAX HP ( @ 240V ): 5 HP • UL-50 Type 3R Listed Enclosure • Enclosure Size: 6" x 6" x 4" Click here for more details
  3. Munro StartBox
    Munro StartBox MPSR242W22 - 2-Wire Decoder Compatible - 24V Controller to 240V Pump
    $74.99
    • Manufacturer: Munro • Series: StartBox 2-Wire Decoder Compatible • MPN: MPSR242W22 • Coil: 220V • Control / Signal Voltage: Any 24V Lawn Controller • Pump / Line Voltage: 240V • MAX HP ( @ 240V ): 5 HP • UL-50 Type 3R Listed Enclosure • Enclosure Size: 6" x 6" x 4" Click here for more details
  4. Munro StartBox
    Munro StartBox MPSR242W11 - 2-Wire Decoder Compatible - 24V Controller to 120V Pump
    $85.95
    • Manufacturer: Munro • Series: StartBox 2-Wire Decoder Compatible • MPN: MPSR242W11 • Coil: 110V • Control / Signal Voltage: Any 24V Lawn Controller • Pump / Line Voltage: 120V • MAX HP ( @ 120V ): 2 HP • UL-50 Type 3R Listed Enclosure • Enclosure Size: 6" x 6" x 4" Click here for more details
  5. Munro SmartBox MPLC24
    Munro SmartBox MPLC24 - Pump Start Relay - Low Pressure Sensor - 24V Controller
    $239.95
    • Manufacturer: Munro • Series: MPLC Series SmartBox • MPN: MPLC24 • Coil: 24V • Control / Signal Voltage: 24V • Pump / Line Voltage: Either 120V or 240V • MAX HP ( @ 120V ): 2 HP • MAX HP ( @ 240V ): 5 HP • Pump Protection ( Included ): Low Pressure Sensor & Boot ( Normally Closed - 20 PSI ) • Adjustable Time Delay ( Factory Set for 30 Sec Time Delay ) • Enclosure Size: 8" x 8" x 4" Click here for more details
  6. Munro StartBox MPSR24V3
    Munro Startbox MPSR24V3 - Thermal Protection - 3.0 HP Motors - 24V Controller
    $250.95
    • Manufacturer: Munro • Series: StartBox Pump Start Relay • Type: Standard with Thermal Protection • MPN: MPSR24V3 • Control Voltage: 24V • Line Voltage: 240V • Motor HP Rated: 3 HP Motors • Amp Range: 17 Amps • Hertz: 60 Hz • Is this box a Safe 24v Output: YES • UL-50 Type 3R Listed Enclosure • Enclosure Size: 12" x 12" x 6" Click here for more details
  7. Munro SmartBox MPLC24T
    Munro SmartBox MPLC24T - Low Pressure & Temperature Sensors - 24V Controller
    $259.95
    • Manufacturer: Munro • Series: MPLC Series SmartBox • MPN: MPLC24T • Enclosure Color: Blue • Enclosure Size: 8" x 8" x 4" • Signal Voltage: 24 Volt • Line Voltage: 120 V / 240 V • Max HP Motor Using 120 Volts: 2 HP • Max HP Motor Using 240 Volts: 5 HP • Pump Protection ( Included ): Low Pressure Sensor & Boot ( Normally Closed - 20 PSI ) Temperature Sensor ( Normally Open 105° F ) Click here for more details
  8. Munro StartBox MPSR24V5
    Munro Startbox MPSR24V5 - Thermal Protection - 5.0 HP Motors - 24V Controller
    $261.45
    • Manufacturer: Munro • Series: StartBox Pump Start Relay • Type: Standard with Thermal Protection • MPN: MPSR24V5 • Control Voltage: 24V • Line Voltage: 240V • Motor HP Rated: 5 HP Motors • Amp Range: 28 Amps • Hertz: 60 Hz • Is this box a Safe 24v Output: YES • UL-50 Type 3R Listed Enclosure • Enclosure Size: 12" x 12" x 6" Click here for more details
  9. Munro SmartBox MPLC242W11T
    Munro SmartBox MPLC242W11T - 2-Wire Decoder Compatible - Low Pressure & Temperature Sensors - 24V Controller to 120V Pump
    $303.45
    • Manufacturer: Munro • Series: SmartBox MPLC242 • MPN: MPLC242W11T • Enclosure Color: Blue • Enclosure Size: 8" x 8" x 4" • Signal Voltage: 24 Volt • Line Voltage: 120 Volt • Max HP Motor Using 120 Volts: 2 HP • Resistive (Cos.=1): 12 Amp • Pump Protection ( Included ): Low Pressure Sensor & Boot ( Normally Closed - 20 PSI ) Temperature Sensor ( Normally Open 105° F ) Click here for more details
  10. Munro SmartBox
    Munro SmartBox MPLC242W22T - 2-Wire Decoder Compatible - Low Pressure & Temperature Sensors - 24V Controller to 240V Pump
    $309.95
    • Manufacturer: Munro • Series: SmartBox MPLC242 • MPN: MPLC242W22T • Enclosure Color: Blue • Enclosure Size: 8" x 8" x 4" • Signal Voltage: 24 Volt • Line Voltage: 240 Volt • Max HP Motor Using 240 Volts: 5 HP • Resistive (Cos.=1): 12 Amp • Pump Protection ( Included ): Low Pressure Sensor & Boot ( Normally Closed - 20 PSI ) Temperature Sensor ( Normally Open 105° F ) Click here for more details

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