Protection Relays
Voltage Monitoring Relays
460 SERIES
3-Phase Voltage Monitor
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.
Wiring Diagram
TYPICAL WIRING DIAGRAM FOR MODEL 460 WITH MOTOR CONTROL
Features & Benefits
FEATURES
Auto-sensing wide
voltage range
Adjustable trip & restart
delay settings
Microcontroller
based circuitry
Advanced LED
diagnostics
Adjustable voltage
unbalance trip setting
BENEFITS
Automatically senses system voltage between 190
- 480VAC or 475-600VAC. Saves set-up time
Prevent nuisance tripping due to rapidly fluctuating
power line conditions
Improved accuracy and higher reliability
Quick visual indicator for cause of trip and relay status
Provides reliable protection when regenerative
voltage is present
Ordering Information
MODEL
VOLTAGE
DESCRIPTION
460
460-L
460-14
460-575
190-480VAC Automatically senses line voltage, adjustable 1-30 second trip delay, 1-500 second restart delay, and 2-8% voltage unbalance trip point
190-480VAC Fixed 4 second trip delay and 1 second for single-phase faults, and fixed 6% voltage unbalance trip point
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
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
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
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
475-600VAC Commonly used in Eastern Canada and on generator units that generate 600 VAC power
460-575-14 475-600VAC
460-15
460-MR
460-VBM
460-OEM
460L-OEM
190-480VAC
190-480VAC
190-480VAC Fixed 6% voltage unbalance trip point. User adjustable low and high voltage trip points
190-480VAC Bulk package of 460, 20 units
190-480VAC Bulk package of 460-L, 20 units
Rev: 1-A-081718
460-400HZ 190-480VAC For use with 400Hz power supply
© 2018 Littelfuse Protection Relays & Controls
www.littelfuse.com/460
www.littelfuse.com/
Protection Relays
Voltage Monitoring Relays
460 SERIES
Specifications
Frequency
Low Voltage (% of setpoint)
Trip
Reset
High Voltage (% of setpoint)
Trip
Reset
Voltage Unbalance (NEMA)
Trip
Reset
460L
Trip Delay Time
Low, High and
Unbalanced Voltage
460L
Single-Phase Faults
(>15% UB)
Restart Delay Time
After a Fault
After a Complete Power Loss
Output Contact Rating
Form C
Pilot Duty
General Purpose
Form A & Form B
Pilot Duty
General Purpose
50/60Hz
90% ±1%
93% ±1%
110% ±1%
107% ±1%
2-8% adjustable
Trip setting minus 1% (5-8%)
Trip setting minus 0.5% (2-4%)
6% UB fixed (4.5% reset)
Ambient Temperature Range
Operating
Storage
Maximum Input Power
Class of Protection
Relative Humidity
Terminal Torque
Wire Type
Standards Passed
Electrostatic Discharge (ESD)
RFI, Radiated
Fast Transient Burst
Surge
IEC
ANSI/IEEE
Hi-potential Test
Safety Marks
UL
CE
Enclosure
Dimensions
Weight
Mounting Method
460-MR (manual reset)
-20° to 70°C (-4° to 158°F)
-40° to 80°C (-40° to 176°F)
6W
IP20, NEMA 1 (finger safe)
10-95%, non-condensing per IEC 68-2-3
4.5 in.-lbs.
Stranded or solid 12-20 AWG, one per terminal
IEC 61000-4-2, Level 3, 6kV contact, 8kV air
150 MHz, 10V/m
IEC 61000-4-4, Level 3,
3.5kV input power and controls
IEC 61000-4-5, Level 3, 4kV line-to-line;
Level 4, 4kV line-to-ground
C62.41 Surge and Ring Wave Compliance
to a level of 6kV line-to-line
Meets UL508 (2 x rated V +1000V for 1 minute)
UL508 (File #E68520)
IEC 60947-6-2
Polycarbonate
H
88.9 mm
(3.5”); W
52.9 mm (2.08”);
D
59.69 mm (2.35”)
0.7 lb. (11.2 oz., 317.51 g)
35 mm DIN rail or Surface Mount
(#6 or #8 screws)
External NO pushbutton required.
1-30 seconds adjustable
4 seconds fixed
1 second fixed
1-500 seconds adjustable
1-500 seconds adjustable
480VA @ 240VAC, B300
10A @ 240VAC
360VA @ 240VAC, B300
8A @ 240VAC
Disclaimer Notice –
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products
are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at
www.littelfuse.com/product-disclaimer.
© 2018 Littelfuse Protection Relays & Controls
www.littelfuse.com/460
www.littelfuse.com/
Rev: 1-A-081718
Real-time operating system RTOS
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