Home » Littelfuse 601, 601 Series, Frequency, Phase Loss, Phase Sequence, Voltage Sensing AC 190 ~ 480VAC
Littelfuse

Littelfuse 601, 601 Series, Frequency, Phase Loss, Phase Sequence, Voltage Sensing AC 190 ~ 480VAC

In stock
SKU: 601
$712.78
Rated voltage
Phase

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


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

Applications
• Oil rigs
• Compressors and fans
• HVAC
• Heat, well, and sump pumps
• Small conveyer motors

The 601 can be preprogrammed prior to installation by applying at least 120 V to the L1 and L2 terminals. *575 V model

Specifications

Input Characteristics  
Frequency 50/60 Hz
Functional Characteristics
Programmable Operating Points
LV - Low Voltage Threshold 170 V (450 V*) - HV Setting
HV- High Voltage Threshold LV Setting - 528 V (660 V*)
VUB - Voltage Unbalance Threshold 2–15% or off
LF - Low Frequency Threshold 35 Hz - HF Setting
HF - High Frequency Threshold LF Setting - 75 Hz
TD1 - Trip Delay for Voltage/ Unbalance/Frequency Faults        1–50 seconds
TD2 - Trip Delay for Single-Phase Faults  1–50 seconds
RD1 - Rapid-Cycle Timer 0, 2–500 seconds
RD2 - Restart Delay After All Faults 2–500 seconds
#RF - Type of Restart Manual or Automatic
ADDR - RS-485 Address A01-A99
Fixed Reset Points
Overvoltage Rese 97% of HV Setting
Low Voltage Reset 103% of LV Setting
Voltage Unbalance Reset UB Setting -1%
Low Frequency Reset LF Setting +0.6 Hz
High Frequency Reset HF Setting -0.6 Hz
Output Characteristics
Output Contact Rating Pilot Duty 480 VA @ 240 V ac
General Characteristics
Temperature Range -20° to 70 °C (-4° to 158 °F)
Accuracy Voltage        ±1%
Timing         5% ±1 second
Repeatability Voltage ±0.5%
Maximum Input Power 5 W
Transient Protection (Internal) 2500 V for 10 ms
Dimensions H 77.47 mm (3.05”)
W 97.79 mm (3.85”)
D 128.27 mm (5.05”)
Weight 1.2 lbs. (19.2 oz., 544.31 g)
Mounting Method Surface mount (4 - #8 screws) or DIN-rail mount
Certification & Compliance UL             UL 508 (File #E68520)
CSA           C22.2 No. 14 (File #46510)