Littelfuse 250A Voltage Monitor Product Description
Model 250A is an auto ranging voltage monitor designed to protect 3-phase
motors regardless of size. It is used on 190-480VAC, 50 to 60 Hz motors to
protect the motors from damage caused by single phasing, low voltage, phase
reversal, voltage unbalance, and also high voltage. Added features include
the DPDT contacts that are used to perform two functions when parameters
are exceeded in addition to the standard adjustable restart delay.
Littelfuse 250A Voltage Monitor Typical Applications
- Fans
- Compressors
- Air Conditioners
- Heat Pumps
- Well Pumps
- Sump Pumps
- Small Conveyor Motors
Littelfuse 250A Voltage Monitor Features
- Protects Motor From:
- Phase Loss (single phasing)
- Phase Reversal
- Low Voltage
- High Voltage
- Voltage Unbalance
- Phase Reversal
- Rapid Cycling
- Adjustable Restart Delay can be set at Manual Position or Anywhere
Between 2-300 Seconds.
- Universal Range from 190-480 VAC 50/60 Hz Provides the Versatility
Needed to Handle Global Applications.
- Bicolor LED Indicator Light is Green in Normal Conditions and Red
During Trip Conditions.
- Microcontroller Based Provides Better Accuracy and Higher Reliability
than Analog Designs.
- Transient Protected to Meet IEC 1000-4-5:1995 Standards and Stand up
Under Tougher Conditions.
- DPDT Relay Provides Two 10A @ 240 VAC General Purpose Relays to Switch
Heavier Loads.
- Will Detect Single Phase Condition Regardless of Regenerated Voltages.
Littelfuse 250A Voltage Monitor Specifications
3-Phase Line Voltage . . . . . . . . . . . . 190 to 480 VAC
Frequency
. . . . . . . . . . . . . . . . . . . . . 50*/60Hz Low Voltage
Voltage Unbalance (NEMA)
- Trip . . . . . . . . . . . . . . . . . . . . . . . . . . 6%
- Reset . . . . . . . . . . . . . . . . . . . . . . . . . 4.5%
Trip Delay Time
- Low Voltage, High Voltage . . . . . . . . . . . . . . . . 4 seconds
- Unbalance, Phasing Faults . . . . . . . 2 seconds
Restart Delay Time
- After a Fault . . . . . . . . . . . . . . . . . Manual, 2-300 seconds adj
- After a Complete Power Loss. . . . . . . Manual, 2-300 seconds adj
Output Contact Rating
- DPDT-2 Form C . . . . . . . . . . . . . . . . . . . . . . . . 480 VA @ 240
VAC Pilot Duty
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . or 10A @240
VAC General Purpose
Temperature Range . . . . . -40° to 70°C (-40° to 158°F)
Trip & Reset Accuracy . . . . . ±1%
Power Consumption
. . . . . . . . . . . . . 5 Watts (Max.)
Relative Humidity . . . . . . Up to 95% non-condensing per IEC 68-2-3
Terminal Torque . . . . . . 7 in.-lbs.
Wire Size . . . . . . 12-18AWG
Transient Protection (internal) . . . . . . IEC 61000-4-5;1995 ±6kV
Approvals
- UL . . . . . . . . . . . . . . . . . . . . . . . . UL508 (File #E68520)
- CSA. . . . . . . . . . . . . . . . . . . . . . . . CSA 22.2 No. 14 (File#46510)
- CE . . . . . . . . . . . . . . . . . . . . . . . . CE IEC 60947-6-2
Weight . . . . . . . . . . . . . . . . . . . . . . . . 16.32 oz.
Mounting Method
. . . . . . . . . . . #8 screws
*Note: 50Hz will increase all delay timers by 20%.
WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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.