Sump pump switch types

The float switch is triggers the sump pump to activate when the water reaches a certain level. Float switches are usually the part that fails first in a sump pump system. There are 4 types of float switches typically used in 12v backup sump pump systems


* The Tethered float is the most common in sump pump systems today because they are the cheapest. They are also more likely to fail. In this type, the float actually floats with the water and when the water reaches a certain point, the switch is triggered. Inside the switch is mercury which activates the switch at a predetermined angle. This switch is best in a large sump crock since the switch requires more space. Narrow crocks could cause the float to get stuck on the wall.






* The vertical action switch uses a float, rod and switch. The float pushes up on the road triggering the switch.They are also easily adjustable for most installations. The only downside for the vertical switch is that it not well suited for deep sump crocks since the range of adjustment is somewhat limited.



* Electronic switches are somewhat new in the sump pump market There are a few different types. One type uses a probe that goes into the crock pit. Once the water reaches the probe, the switch is triggered. Another type uses a caged float setup. The float rises in the cage with the water triggering the switch. The actual control for these types is outside the sump crock. The advantage to these types are less moving parts.



* Diaphragm type switches work well in most situations however they are somewhat more costly. The switch consists of a diaphragm that allows water to press against it. When there is enough pressure from the rising water, the switch is activated. These types work well in small sump crocks. It is important to remember however, that this type is not adjustable.



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