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SymCom Model 50R-400-ALT Alternating Relay 380-480V Surface

Price: $246.22
Quantity:
+ -
Usually ships within 1 week
SKU: MSR50R400ALT


Shipping Weight:
2.0 LBS
Shipping Dimensions
Length: 4 In
Width: 4 In
Height: 4 In
WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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

  • Pilot Duty. . . . . . . . . . . . . . . . . . . . . . . . . . . . 470VA @ 600VAC
  • General Purpose. . . . . . . . . . . . . . . . . . . . . . . . . .  10A 
  • Debounce Time Delay . . . . . . . . . . . . . . . . . . . . . . . . . . 1 second

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

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

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

Safety Marks

  • UL . . . . . . UL508 (File #E68520)
  • CE . . . . . . . . . . . IEC 60947

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

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


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

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

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Littelfuse 50R-400-ALT Product Specifications

Littelfuse 50R-400-ALT Installation Bulletin

SymCom Warranty

SymCom Limited Warranty

Terms and Conditions of Sale

Effective January 1, 2009 General Remarks: These Terms and Conditions of Sale apply to all sales and deliveries effected by SymCom. Any terms or conditions on the part of the purchaser that are contrary to these shall not be binding on SymCom, even if they form the basis of the order. Prices: Subject to change without notice. Minimum order is one hundred-fifty dollars ($150.00), excluding shipping charges. Terms: Net 30 days from ship date with approved credit. New customers requesting trade credit must submit a credit application prior, and receive approval prior to an order being placed in production. Handling Fee: A $5.00 handling fee will be assessed on each order. Delivery: Buyer's delivery schedule will be met to the best of SymCom's ability. SymCom reserves the right to make partial shipments on any order. SymCom is not responsible for shipping errors on behalf of the carrier. Freight: All sales are F.O.B., SymCom, Inc., Rapid City, SD. Shipments will be made by the transportation method selected by the Buyer whenever practical. Warranty: SymCom warrants its standard products against defects in material or workmanship for a period of five (5) years from the date of manufacture. All third-party products are warranted by their manufacturer and are handled as a pass-through warranty by SymCom. All custom and private labeled products are warranted for eighteen (18) months unless otherwise stated in writing. The liability of SymCom is limited, at its option, to replace, repair, or credit at the purchase price, for any devices which are returned during the warranty period and which prove to be defective. This warranty constitutes SymCom's sole liability here under and is in lieu of any other warranty expressed, implied or statutory, written or oral, including without limitation, any implied warranties of merchantability or fitness for a particular purpose and supersedes any representations made by any person which are inconsistent with or expand the terms set forth in this document. No person is authorized to modify this warranty in any way whatsoever. Limits of Liability: IN NO EVENT, REGARDLESS OF CAUSE, SHALL SYMCOM BE LIABLE FOR (1) PENALTIES OR PENALTY CAUSES OF ANY DESCRIPTION OR (2) FOR CERTIFICATION NOT OTHERWISE SPECIFICALLY PROVIDED HEREIN AND/OR INDEMNIFICATION OF BUYER TO OTHERS FOR COSTS, DAMAGES OR EXPENSES, EACH ARISING OUT OF OR RELATED TO THE PRODUCT OR SERVICES OF ANY ORDER OR (3) FOR ANY DAMAGES, WHETHER GENERAL, SPECIAL, OR FOR NEGLIGENCE, AND EXPRESSLY EXCLUDES DAMAGES RESULTING FROM LOSS OF PROFITS, USE OF PRODUCTS, ANY INCIDENTAL, OR INDIRECT CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SYMCOM'S OBLIGATION TO REPAIR, REPLACE OR CREDIT THE PURCHASE PRICE SHALL BE THE LIMIT OF ITS LIABILITY UNDER THIS WARRANTY. Returns: All returns must be authorized by SymCom and must have a Return Material Authorization (RMA) number. Issuance of a RMA number does not acknowledge goods as defective or under warranty by the seller. Unauthorized returns will be refused. Authorized returns must be shipped freight prepaid and are subject to inspection and/or testing prior to disposition. Product built to Buyer's specifications cannot be returned for credit or exchanged under any circumstances. For SymCom’s complete RMA terms, please visit our website. Cancellation of Custom or Non-Preferred Products: Buyer may cancel an order upon written notice to SymCom's customer service department and upon payment of cancellation charges, which shall include all costs, both direct and indirect, incurred and/or committed. SymCom agrees to divert completed work and work in progress from a cancelled order to other orders whenever possible. Cancellation of Preferred Products: Full refund if returned within 30 days of purchase. Unit must be in original packaging and in new condition. An RMA must be issued for any return.

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