601 Series – Three-Phase Voltage & Frequency Monitor Series - Littelfuse 601 Voltage Monitoring Relays Provide Superior Protection

Series: 601 Series – Three-Phase Voltage & Frequency Monitor
Questions? Contact Littelfuse Support
External overview image
Roll Over to Zoom
Disclaimer Notice

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 601 series is a fully-programmable voltage monitor designed to protect three-phase motors from loss of any phase (single-phasing), phase reversal, low- or high-voltage, voltage unbalance, low- or high-frequency, and rapid cycling. When a harmful condition is detected, the 601’s output relay is deactivated after the specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for the programmed restart delay (RD2). This monitor can be used as a stand-alone product or networked with an RM-1000, RM-2000, PLC, computer, or SCADA system.

Eleven setpoints are viewable with the three-digit LED display or from a networked device:

  • low voltage
  • high voltage
  • voltage unbalance
  • low frequency
  • high frequency
  • RS485 address
  • trip delay for voltage/frequency faults
  • trip delay for single-phase faults
  • rapid-cycle timer (RD1)
  • restart delay after all faults (RD2)
  • type of restart after all faults (manual or automatic)

Six parameters are viewable while the motor is running:
  • L1-L2 voltage
  • L2-L3 voltage
  • L1-L3 voltage
  • average voltage
  • voltage unbalance (%)
  • frequency

When used with the RS485MS-2W communications module, the 601 can communicate with most Modbus RTU master devices. Voltage conditions can be monitored and setpoints can be changed remotely using Solutions software, an RM1000, RM2000, or other device.

Features

  • Built-in display
  • Programmable voltage and frequency settings
  • Two programmable restart delay timers
  • Two programmable trip delay timers
  • Programmable restart control
  • Flexible reset
  • Remote display compatibility
  • Network communications capability

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)		Termination TypeMounting MethodDimensionsWeight (lbs/g)AddressHumidityInput AC Line Frequency (Hz)Maximum Input PowerOutput Load Rating (VA)Over/Under Frequency (%)Overvoltage Reset Voltage (%)Protection ClassRapid Cycle Timer (s)Repeat Accuracy (%)StockSamplesCompare
601200 - 480 VacTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)0 KgA01 - A9910 - 95% non-condensing per IEC 68-2-350 / 605Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacLow: 35 Hz - HF setting; High: LF setting - 75 Hz97% of HV SettingIP20; NEMA 1 (finger safe)0; 2 - 500 sVoltage: ±0.5%CheckOrder
601575500 - 600 VacTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)0 KgA01 - A9995% non-condensing per IEC 68-2-350 / 605Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacLow: 35 Hz - HF setting; High: LF setting - 75 Hz97% of HV SettingIP20; NEMA 1 (finger safe)0; 2 - 500 sVoltage: ±0.5%CheckOrder
To request product environmental information, please complete the Product Environmental Information Request Form.