Littelfuse 355-400-5 Voltage Monitor Product Description
The 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others.
The 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions.
The 355-200 is equipped with a heavy-duty 10A general purpose SPDT relay. The 355-400 and 355-600 are equipped with a 470VA @ 600VAC pilot duty SPDT relay. A high voltage (600V) DPDT relay output option is available with the 400V model.
Littelfuse 355-400-5 Voltage Monitor Typical Applications
- Fans
- Compressors
- HVAC
- Heat Pumps
- Well Pumps
- Sump Pumps
- Small Conveyor Motors
- Oil Rigs
Littelfuse 355-400-5 Voltage Monitor Features
- Proprietary Microcontroller Based Circuitry: Constantly Monitors 3 Phase Voltage to Protect Against Harmful Line Conditions, Even Before the Motor is Started
- Advanced LED Indication: Provides Diagnostics which can be Used for Troubleshooting and to Determine Relay Status
- Adjustable Trip and Restart Delay Settings: Prevent Nuisance Tripping Due to Rapidly Fluctuating Power Line Conditions and Allows Staggered Start Up of Multiple Monitors, After a Fault to Prevent a Low Voltage Condition
- Combines Protection and Diagnostics: Perfect for Heavy Duty Applications: Pump Panels, Commercial HVAC and Oil Rigs
- 600V Rated Relay Contacts Available on Some Models: Eliminates the Need for a Control Transformer to Step Voltage Down to 120-240V for a Control Circuit
Littelfuse 355-400-5 Voltage Monitor Specifications
3-Phase Line Voltage . . . . . . . . . . . . 380 to 480 VAC
Frequency
. . . . . . . . . . . . . . . . . . . . . 50*/60Hz
Low Voltage (% of setpoint)
- Trip . . . . . . . . . . . . . . . . . . . . . . . . . . 90% ±1%
- Reset . . . . . . . . . . . . . . . . . . . . . . . . . 93% ±1%
High Voltage (% of setpoint)
- Trip . . . . . . . . . . . . . . . . . . . . . . . . . . 110% ±1%
- Reset . . . . . . . . . . . . . . . . . . . . . . . . . 107% ±1%
Voltage Unbalance (NEMA)
- Trip . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8% adjustable
- Reset . . . . . . . . . . . . . . . . . . . . . . . . . Trip setting minus 1%
Trip Delay Time
- Low & High Voltage and Unbalance. . . . . . . . . . . . 2-30 seconds adjustable
- Single-Phasing Faults (>25% UB) . . . . . . . 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
- SPDT (355200) . . . . . . . . . . . . . . . . . . . . . . . . 480VA @ 240VAC Pilot Duty
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . or 10A General Purpose
- SPDT (355400, 355600) . . . . . . . . . . . . 470VA @ 600VAC Pilot Duty
- DPDT(-5 Option) . . . . . . . . . . . . . . . . . 470VA @ 600VAC Pilot Duty
Temperature Range
- Operating . . . . . . . . . . . . . . . . . -40° to 70°C (-40° to 158°F)
- Storage . . . . . . . -40° to 80°C (-40° to 176°F)
Repeat Accuracy
- Fixed Conditions . . . . . . . . . . . . . . . . . ±0.1%
Power Consumption
. . . . . . . . . . . . . 6 Watts (Max.)
Terminal Torque . . . . . . 7 in.-lbs.
Wire Size . . . . . . 12-18AWG
Transient Protection (Internal) . . . . . . 2500V for 10 ms
UL Recognized . . . . . . UL508 (File #E68520)
Weight . . . . . . . . . . . . . . . . . . . . . . . . 15.4 oz.
Mounting Method
. . . . . . . . . . . #8 screws
Special Options
*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.