460-14 - 460 Series

Littelfuse Voltage Monitoring Relays
The 460 is a 3-phase voltage monitor that protects 190-480VAC or 475-600V, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage set point and the voltage monitor automatically senses line voltage.

This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages 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 460 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 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.

Property (Mouseover for details) Value
Input Voltage (V) 190 to 480VAC
Maximum Input Power 6W
Input AC Line Frequency (Hz) 50/60Hz (50Hz will increase all delay timers by 20%.)
Output Form 1 Form A and 1 Form B
Output Load Rating (VA) Pilot Duty: 360VA @ 240VAC B300; General Purpose: 8A @ 240VAC
Restart Delay Range 1 - 500s adjustable
Trip Delay Range Under Over and Unbalanced Voltage: 1 - 30s adjustable; Single-Phase Faults (>25%UB): 1s fixed
Trip Point Accuracy (%) ±1%
Overvoltage Trip Voltage (%) 110%
Overvoltage Reset Voltage (%) 107%
Undervoltage Trip Voltage 90%
Undervoltage Reset Voltage (%) 93%
Voltage Unbalance Trip Point (%) 2 - 8% adjustable
Voltage Unbalance Reset (%) Trip setting minus 1% (5-8%) or Trip setting minus 0.5% (2-4%)
Protection Class IP20 NEMA 1 (finger safe)
Termination Type Torque: 6in-lbs; Wire: Stranded or solid 12-20AWG one per terminal
Mounting Method 35mm DIN rail or Surface Mount (#6 or #8 screws)
Operating Temperature -20° to 70°C (-4° to 158°F)
Storage Temperature (F/C) -40° to 80°C (-40° to 176°F)
Humidity 10-95% non condensing per IEC 68-2-3
Dimensions 3.50 in H x 2.08 in W x 2.35 in D (88.9 x 52.9 x 59.7 mm)
Weight (lbs/g) 0.7 lb. (11.2 oz. 317.5 g)