201A Series – Three-Phase Voltage/Phase Monitor Series - Littelfuse 201A Voltage Monitoring Relays Provide Superior Protection

Series: 201A Series – Three-Phase Voltage/Phase Monitor
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The 201A series is a three-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50/60 Hz motors regardless of their size. This monitor provides a user-selectable nominal voltage setpoint and will automatically select between the 200 V and 400 V range. It includes advanced, single LED diagnostics where color and light patterns distinguish between faults and normal conditions. This unique microcontroller-based voltage and phase-sensing unit constantly monitors the three-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels for a specified restart delay time.

Features

  • Proprietary microcontroller-based circuitry
  • Auto-sensing wide voltage range
  • Advanced LED diagnostics
  • Compact design for 8-pin; DIN-rail or surface mount

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Output
Form		Termination TypeMounting MethodDimensionsWeight (lbs/g)HumidityInput AC Line Frequency (Hz)Maximum Input PowerOutput Load Rating (VA)Overvoltage Reset Voltage (%)Overvoltage Trip Voltage (%)Restart Delay RangeTrip Delay RangeTrip Point Accuracy (%)StockSamplesCompare
201A190 - 480 VacSPDTTorque: 12 in-lbs.; 12 - 22 AWG solid or strandedDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 605Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 Vac2 sUnder/Over Voltage: 4 s; Unbalance/Phase faults: 2 s±1%CheckOrder
201A-9190 - 480 VacSPDTTorque: 12 in-lbs.; 12 - 22 AWG solid or strandedDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 605Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 Vac107%110%2 sUnder/Over Voltage: 4 s; Unbalance/Phase faults: 2 s±1%CheckOrder
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