Datasheet

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49
Available Models:
Features:
• Alternates between two loads
• Solid-state reliability
• Debounce time delay
• Compatible with single or dual float
applications
A pprovals:
50R-400-ALT
Specications
The Model 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.
For more information see:
See Appendix A, page 68, Figure 7 for dimensional
drawing.
See Appendix B, page 80, Figure 46 for typical
wiring diagrams.
* The alternating relay will not switch states while
current is flowing. Switching will only occur after
current has been sensed, followed by loss of current
for the duration of the debounce time delay.
Model 50R-400-ALT
480VAC application, panel mount
Alternating Relay
Input Characteristics
Supply Voltage .................................380-480VAC
Supply Current .................................40mA
Functional Characteristics
Control Input Impedance (min). . . . . . . . . . . . . . . . . . .1MΩ
Output Characteristics
Output Contact Rating
Pilot Duty .....................................470VA @ 600VAC
General Purpose ................................10A
Debounce Time Delay ..........................1 second
General Characteristics
Maximum Input Power .........................5 W
Terminal
Torque ........................................7 in.-lbs.
Wire Size ......................................12-18AWG
Safety Marks
UL ............................................UL508 (File #E68520)
CE ............................................IEC 60947
Dimensions ....................................2.93”H x 5.27”W x 2.95”D
(74.4 x 133.9 x 74.9mm)
Weight ........................................0.98 lb. (15.68 oz., 444.52 g)
Mounting Method ..............................#8 screws
CATALOG_SYMCOM_2014.indd 49 6/10/14 11:06 AM