Littelfuse 50R-400-ALT Alternating Duplex Pump Description

The 50R-400-ALT alternating relays are used to alternate between two loads, most commonly in duplex pumping and compressor applications to balance the runtime of both loads

When used in single float applications, the alternating relay changes state after the float switch opens*, forcing the other pump to run the next time the float closes. When used in dual float applications, the alternating relay will allow both pumps to run simultaneously when the lead and lag floats are both closed.

An adjustment knob provides the option to force one pump to run every time the float switch is closed. This is helpful when one pump has been removed for repair or for test purposes. A built-in debounce feature prevents the alternating relay from changing state if the float contact bounces momentarily.

Littelfuse 50R-400-ALT Alternating Duplex Pump Relay Typical Applications

• Duplex Control Panels

Littelfuse 50R-400-ALT Alternating Duplex Pump Relay Features

• Alternates Between Two Loads
• Solid-State Reliability
• Compact Size
• Debounce Time Delay
• Compatible with Single or Dual Float Applications
• 600VAC Control Contacts
• 10 Amp General Purpose Relay Rating
• UL Listed
• CE Marked
• 5-Year Warranty
• Made in the USA

Littelfuse 50R-400-ALT Alternating Relay Duplex Pump Specifications

Supply Voltage . . . . . . . . . . . . 380-480 VAC

Supply Current . . . . . . . . . . . . . 40mA

Control Input Impedance (min). . . . . . . . . . . . .1MΩ

Output Contact Rating

Maximum Input Power   . . . . . . . . . . . . . 5 Watts

Terminal Torque . . . . . . . . . . . . . 7 in.-lbs.

Wire Gauge . . . . . . . . . . . . . 12-18AWG

Safety Marks

Weight . . . . . . . . . . . . . . . . . . . . . . . . 15.68 oz.

Mounting Method . . . . . . . . . . . #8 screws

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Littelfuse 50R-400-ALT Alternating Duplex Pump Relay Resources

Littelfuse 50R-400-ALT Product Specifications

Littelfuse 50R-400-ALT Installation Bulletin