Pump Switches & Relays

About Pump Relay Switches

In irrigation applications, pumps need a device that signals to the system to start moving water in the direction of the pump. That's exactly the function that a pump relay switch performs. You can see how crucial this pump part is to the operation of the automatic system. Save on your replacement parts at PlumbersStock and take advantage of our wholesale prices. Buy in bulk and save on shipping.

What Is a Pump Relay Switch

A pump relay switch is often seen in well applications to pump water from the well to your home or building. A pump relay switch is used with higher horsepower submersible pumps and signals to the pump when to turn on and off.

Pump relay switches can be thought of as buffers between the pump pressure control switch and a heavy-duty water pump. For lighter water pumps, the on/ off pump action is controlled by the pressure control switch directly. However, the problem arises when the water pump has too high a voltage/amperage combination. Large horsepower water pumps can easily draw more than 15A—enough amperage that would cause the pressure control switch to be burned up rapidly.

  • How does it Work?  - Water pump relay switches run on electrical power varying from 120V to 240V, depending on the pump and manufacturer. On one side, electrical wiring provides the relay switch with the power it needs to run. On the other side, wiring runs down to the submersible water pump. A separate pair of wires then run from the relay switch to the pump pressure control switch. When the pump pressure control switch detects a need for change in water pressure, it signals to the relay switch to turn on, effectively turning on the water pump.
  • When are Pump Relay Switches Not Used?  - The pump relay switch works marvels in connecting larger HP water pumps to the pressure control switch, actively working to create a smooth, automatic water flow experience. However, keep in mind that the pump relay switch should not be used for every application. For instance, when the water pump is found above-ground (non-submersible), such as in installations where a jet pump is installed near the water pressure tank. Additionally, these separate relay switches should not be used with submersible pumps that draw on average less than 15A of current. For those installations, the water pump pressure control switch should be enough.

Shop Pump Switches and Relays

Overall, PlumbersStock offers a wide variety of fantastic switches and plumbing controls for your consideration. And, with our low prices, high-quality brands, and a host of other irrigation and plumbing products (not to mention HVAC), it’s easy to see why so many choose us for their home improvement needs. Call today for more information, or visit the rest of our site to check out our other awesome guides and products. We cannot wait to hear from you soon!

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