Product Description
SJE MilliAmpMaster™ Float Switch for Potable Water Applications
The SJE MilliAmpMaster float switch is a mechanically-activated, narrow-angle, NSF/ANSI 61 certified control switch designed for reliable low-current control in AC and DC potable water applications. This SJE MilliAmpMaster WPS model is ideal for use as a control float switch in PLC systems, alarm panels, and low-current control circuits.
Constructed with sealed gold cross-point contacts, this SJE Rhombus float switch ensures consistent, non-arcing performance in sensitive, low-amperage environments, making it a reliable low-current float switch for control panel and solar applications.
This SJE MilliAmpMaster float switch activates and deactivates at approximately 1.5 inches above and below horizontally, using a 3.5-inch tether for precise level control. It is not sensitive to rotation, ensuring consistent operation in real-world installations.
NSF/ANSI 61 Certified (Potable Water Approved)
Meets strict drinking water safety standards, making it suitable for potable water tanks, municipal systems, and water treatment applications.
Key Features of the SJE MilliAmpMaster Float Switch (Low Current Control Switch)
Low Current, Non-Arcing Operation: Designed for applications down to 0.160 mA, making it ideal as a low amperage float switch for control circuits and PLC systems
Sealed Gold Contacts: Provides reliable switching performance for sensitive electronics and non-arcing float switch applications
Narrow Angle Activation: Activates/deactivates at approximately 1.5” above and below the horizontal for precise level control
SPDT Functionality (3-Wire): Can be wired as normally open or normally closed, offering flexible system integration
Not Sensitive to Rotation: Ensures consistent performance regardless of float orientation
Durable Polypropylene Float: High-impact, corrosion-resistant construction for long-lasting use
Potable Water Certified: NSF/ANSI 61 compliant, making it a trusted potable water float switch
Easy Identification: Orange cap for quick visual recognition
5-Year Limited Warranty: Backed by SJE Rhombus reliability
NSF-Certified Float Switch for Potable Water Control Applications
The SJE MilliAmpMaster float switch is purpose-built for applications where traditional float switches are not suitable.
Common Applications:
PLC (programmable logic controller) systems
Control panels and relay systems
Alarm float switch systems
Low current solar applications
Potable water storage tanks
Water treatment systems
This makes it an excellent float switch for control panel integration, especially where precision and low current switching are critical.
How the SJE MilliAmpMaster Float Switch Works
This narrow-angle float switch is designed for accurate and repeatable activation.
Activates at approximately 1.5 inches above horizontal
Deactivates at approximately 1.5 inches below the horizontal
Uses a 3.5-inch tether length for tight control range
Wiring Configurations:
Normally Open (High Level):
Turns ON when the liquid rises and the float tips above the horizontal
Normally Closed (Low Level):
Turns ON when liquid drops and the float tips below the horizontal
This flexibility allows the SJE MilliAmpMaster WPS to be used in both pump-up and pump-down control applications.
Electrical Performance (Low Current Precision)
This low-current float switch is engineered for sensitive electrical systems:
125 VAC
Max Load: 1 amp
Min Load: 0.160 mA
30 VDC
Max Load: 0.1 amp
Min Load: 0.160 mA
5 VDC
Min Load: 1 mA
Perfect for:
PLC float switch systems
Low-voltage control circuits
Non-arcing control applications
Specifications
Specification
Details
Cable
16 gauge, 3 conductor (UL, CSA), SJOW, water-resistant (CPE)
Float Size
2.74” diameter x 4.83” length
Material
High-impact polypropylene
Max Water Temp
140°F (60°C)
Max Depth
30 ft (9 m), 13 PSI
Switch Type
SPDT (Single Pole Double Throw)
Operation Angle
Narrow angle (±1.5” from horizontal)
Certification
CSA, NSF/ANSI 61 (potable water approved)
Installation Overview
Installing the SJE MilliAmpMaster float switch is straightforward and designed for flexibility in control systems:
Attach the cable clamp at your desired activation level
Maintain a 3.5” tether length for proper operation
Ensure the float moves freely without obstruction
Select the correct wires (NO/NC) based on your application
Insulate unused wires using a wire nut
Allow the system to cycle to confirm proper function
⚠️ Always disconnect power before installation and follow applicable electrical codes.
Why Choose the SJE MilliAmpMaster WPS?
NSF/ANSI 61 certified for potable water safety
Designed specifically for low current and control applications
Reliable performance in non-arcing environments
Trusted SJE Rhombus float switch engineering
Certified safe for potable water systems
Ideal for PLC, alarm, and control panel integration
If you're looking for a high-performance control float switch, rather than a standard pump switch, the SJE MilliAmpMaster is the right solution.
Available Options from Cleanflow
Cleanflow offers multiple configurations of the SJE MilliAmpMaster float switch, all NSF/ANSI 61 certified for potable water applications, to suit your application:
15 ft cable
30 ft cable
50 ft cable
All models include a pipe clamp for easy installation.
👉 Available across Canada and the USA, with fast shipping and expert support.
Need a Pump Switch Instead?
If you're looking for a float switch designed for direct pump control rather than low current applications, consider the SJE PumpMaster® WPS, a reliable solution for potable water pump systems.
Frequently Asked Questions
What is a low-current float switch used for?
A low-current float switch like the SJE MilliAmpMaster is used in control panels, PLC systems, alarms, and solar applications where minimal electrical load is required.
Can the SJE MilliAmpMaster be used with a control panel?
Yes, this is a control float switch specifically designed for control panels, including PLC and relay-based systems.
Is this float switch safe for potable water?
Yes, it is NSF/ANSI 61 certified, making it suitable for potable water tanks and systems.
Can it be wired normally open or normally closed?
Yes, the SPDT design allows it to function as either normally open (NO) or normally closed (NC), depending on your application.
What makes this different from a standard float switch?
Unlike typical pump switches, this is a non-arcing float switch designed for low-amperage control circuits, offering precise operation and compatibility with sensitive electronics.
How is the SJE MilliAmpMaster float switch wired?
This is a 3-wire float switch (SPDT):
Black = Normally Open (NO)
Red = Normally Closed (NC)
White = Common
It can be configured for pump-up or pump-down control logic, depending on your system setup.
What is the activation range of this narrow-angle float switch?
This narrow-angle float switch activates and deactivates at approximately 1.5 inches above and below horizontal, using a 3.5-inch tether for precise control.
What cable and installation setup does it use?
The SJE MilliAmpMaster WPS float switch includes:
16-gauge, 3-conductor cable
Pipe clamp for mounting
Adjustable tether for activation level
This makes installation simple for the float switch for control panel setups and tank applications.
