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

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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-selectabl e 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% adjustableReset 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 adjustable460L 4 seconds fixedSingle-Phase Faults (>15% UB) 1 second fixed Restart Delay Time After a Fault 1–500 seconds adjustableAfter a Complete Power Loss 1–500 seconds adjustable Output Contact Rating Form C Pilot Duty 480 VA @ 240 V ac, B300General Purpose 10 A @ 240 V ac Form A & Form B Pilot Duty 360 VA @ 240 V ac, B300General 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 Show more