Home » Littelfuse 460-MR, 460 Series, 3-Phase Voltage Monitor, Voltage Asymmetry, Voltage Sensing AC, Phase Loss 190 ~ 480VAC
Littelfuse

Littelfuse 460-MR, 460 Series, 3-Phase Voltage Monitor, Voltage Asymmetry, Voltage Sensing AC, Phase Loss 190 ~ 480VAC

In stock
SKU: 460-MR
$284.61
Rated voltage
Phase
Description

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The 460 series is a three-phase voltage monitor that protects 190–480 V ac or 475–600 V ac, 50/60 Hz motors regardless of their size. This voltage monitor provides a user-selectable nominal voltage setpoint and will automatically sense line voltage. A unique microcontroller-based voltage and phase-sensing circuit constantly monitors the three-phase voltage to detect harmful power line conditions such as low, high, and unbalanced voltage, loss of any phase, and phase reversal. When a harmful condition is detected, the MotorSaver® output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip and restart delays prevent nuisance tripping due to rapidly fluctuating power line conditions. All 460 models feature an adjustable 1–30 second trip delay, 1–500 second restart delay, 2–8% voltage unbalance trip point, and one form C contact except where noted on the datasheet.

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

Specifications

 Frequency  50/60 Hz       
Functional Characteristics
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% (5–8%), Trip setting minus 0.5% (2–4%)
460L           6% UB fixed (4.5% reset)
Trip Delay Time Low, High and Unbalanced Voltage     1–30 seconds adjustable
460L                                                4 seconds fixed
Single-Phase Faults (>15% UB)    1 second fixed
Restart Delay Time After a Fault        1–500 seconds adjustable
After a Complete Power Loss    1–500 seconds adjustable
Output Contact Rating
Form C Pilot Duty               480 VA @ 240 V ac, B300
General Purpose    10 A @ 240 V ac
Form A & Form B Pilot Duty               360 VA @ 240 V ac, B300
General Purpose     8 A @ 240 V ac
General Characteristics
Ambient Temperature Range Operating             -20° to 70 °C (-4° to 158 °F)
Storage                 -40° to 80 °C (-40° to 176 °F)
Maximum Input Power 6 W
Class of Protection IP20, NEMA 1 (finger safe)
Relative Humidity 10–95%, non-condensing per IEC 68-2-3
Terminal Torque 4.5 in.-lbs.
Wire Type Stranded or solid 12–20 AWG, one per terminal
Standards Passed
Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6 kV contact, 8 kV air
RFI, Radiated 150 MHz, 10 V/m
Fast Transient Burst IEC 61000-4-4, Level 3, 3.5 kV input power and controls
Surge
IEC IEC 61000-4-5, Level 3, 4 kV line-to-line; Level 4, 4 kV line-to-ground
ANSI/IEEE C62.41 Surge and Ring Wave Compliance to a level of 6 kV line-to-line
Hi-potential Test Meets UL508 (2 x rated V +1000 V for 1 minute)
Enclosure Polycarbonate
Dimensions H 88.9 mm (3.5”)
W 52.9 mm (2.08”)
D 59.69 mm (2.35”)
Weight 0.7 lb. (11.2 oz., 317.51 g)
Mounting Method 35 mm DIN-rail or surface mount (#6 or #8 screws)
460-MR (manual reset) External NO pushbutton required.
Certification & Compliance UL                 UL508 (File #E68520)
CE                 IEC 60947-6-2