© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Voltage Monitoring Relays
www.littelfuse.com/460
Rev: 1-A-062816
3-Phase Voltage Monitor
460 SERIES
Wiring Diagram
TYPICAL WIRING DIAGRAM FOR MODEL 460 WITH MOTOR CONTROL
Ordering Information
MODEL VOLTAGE DESCRIPTION
460 190-480VAC Automatically senses line voltage, adjustable 1-30 second trip delay, 1-500 second restart delay, and 2-8% voltage unbalance trip point
460-L 190-480VAC Fixed 4 second trip delay and 1 second for single-phase faults, and fixed 6% voltage unbalance trip point
460-14 190-480VAC
Equipped with 2 sets of contacts: Form A (NO) and Form B (NC). Used for applications requiring 2 different voltages such as 5VDC
for a PLC input and 115VAC for an alarm
460-575 475-600VAC Commonly used in Eastern Canada and on generator units that generate 600 VAC power
460-575-14 475-600VAC
Commonly used in Eastern Canada and on generator units that generate 600 VAC power. Equipped with 2 sets of contacts: Form A
and Form B
460-15 190-480VAC
Equipped with 2 sets of Form A (NO) contacts. Used on applications where two different units are to be controlled at once such as a
unit that has separate contacts for a compressor and a fan
460-MR 190-480VAC
Equipped with a 2-prong connection for a normally open push button mounted outside the panel. Used in applications requiring an
external manual reset button
460-VBM 190-480VAC Fixed 6% voltage unbalance trip point. User adjustable low and high voltage trip points
460-400HZ 190-480VAC For use with 400Hz power supply
460-OEM 190-480VAC Bulk package of 460, 20 units
460L-OEM 190-480VAC Bulk package of 460-L, 20 units
Description
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 setpoint 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 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 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 below.
Features & Benefits
FEATURES BENEFITS
Auto-sensing wide
voltage range
Automatically senses system voltage between 190
- 480VAC or 475-600VAC. Saves set-up time
Adjustable trip & restart
delay settings
Prevent nuisance tripping due to rapidly fluctuating
power line conditions
Microcontroller
based circuitry
Improved accuracy and higher reliability
Advanced LED
diagnostics
Quick visual indicator for cause of trip and relay status
Adjustable voltage
unbalance trip setting
Provides reliable protection when regenerative
voltage is present
