Product Description
Master Pump Control with SJE Rhombus AmpMaster® Wide Angle Float Switch
SJE AmpMaster® 20 Amp wide-angle float switch is a mechanically-activated pump float switch designed for reliable control of sump, sewage, and wastewater pumps. It provides direct control of pumps up to 1-1/2 HP at 120V and 3 HP at 240V, making it a dependable solution for lift stations, septic systems, and high-head sewage applications.
This wide-angle pump float switch is not sensitive to rotation or turbulence, allowing consistent performance in both calm and turbulent conditions. Designed for pump-down operation, it activates as the liquid rises and shuts off as the levels drop. With a non-mercury mechanical design, UL/CSA certifications, and a five-year warranty, it delivers long-term reliability.
Key Features of the SJE Rhombus AmpMaster
Direct Pump Control (20 Amp Rated)
Controls pumps up to 1-1/2 HP at 120V and 3 HP at 240V
Wide Angle Float Switch Design
Provides a larger activation range, reducing pump cycling and extending pump life
Pump Down Operation
Normally open contacts designed for emptying applications
Heavy-Duty Construction
Heavy-duty contacts mounted on high-conductivity copper substrates
Adjustable Pumping Range
9" to 24" adjustable range
Non-Mercury Mechanical Design
Eco-friendly and suitable for wastewater environments
Flexible Cable Options
Available up to 30 feet
Corrosion-Resistant Float Housing
High-impact PVC housing
Water-Resistant Cable
12-gauge SJOW cable (UL, CSA)
Includes Mounting Clamp
For secure installation
How This Wide Angle Pump Float Switch Works
This mechanically-activated float switch responds to movement of the float.
As liquid rises, the float tilts upward, activating internal contacts and turning the pump on. As levels drop, the float returns to resting position and turns the pump off.
The wide-angle design reduces frequent cycling and improves efficiency.
Best Applications
Sump pump systems
Sewage and wastewater systems
Lift stations
Septic systems
Grinder pump applications
This makes it an excellent sewage float switch and lift station solution.
Pump Down Operation
Normally open contacts
Pump turns ON when liquid rises
Pump turns OFF when liquid drops
Technical Specifications
Category
Specification
Product Type
Wide-angle float switch
Operation Type
Pump down
Switch Type
Direct wiring
Application
Sump, sewage, wastewater
Max Run Current
20 amps
Max Start Current
120 amps
Voltage
120/240 VAC
Max Pump (120V)
1-1/2 HP
Max Pump (240V)
3 HP
Pumping Range
9" to 24"
Cable
12 gauge SJOW
Float Material
PVC
Temperature
Up to 120°F
Warranty
5-Year
Important Electrical & Application Notes
Note
Details
Thermal Protection
Required
Control Circuits
Not suitable
Minimum Load
Not under 1 amp
Capacitor
May be required
Installation
Direct wiring only
Get the 20 Amp Rated SJE AmpMaster® Pump Switch
Upgrade your system with the reliable SJE AmpMaster® wide-angle float switch.
Cleanflow supplies SJE Rhombus products across Canada and the USA. Browse SJE Rhombus Controls & Alarms for more options.
Frequently Asked Questions
What is a wide angle float switch?
A wide-angle float switch provides a larger difference between ON and OFF levels, reducing pump cycling and improving efficiency.
What is a pump-down float switch?
A pump-down float switch activates when water rises and shuts off when levels drop.
Can this be used as a sewage float switch?
Yes, it is designed for sewage, wastewater, and lift station applications.
Is this a piggyback float switch?
No, this model is designed for direct wiring.
What size pump can this float switch control?
1-1/2 HP at 120V
3 HP at 240V
How do I adjust the pumping range?
Adjust the tether length to change ON/OFF range.
Where can I buy this product?
You can purchase it from Cleanflow across Canada and the USA.
Usually ships same or next day. 
