Protection Relays & Controls
Generator & Single-Function Protection–Voltage
T3100 SERIES
Voltage Relay
Simplified Circuit Diagram
T3100
(Voltage Relay)
(L)
L
1
(N)
L
2
1
2
3
UNDERVOLTAGE
ALARM
OVERVOLTAGE
ALARM
10
9
8
7
6
5
Description
The T3100 Voltage Relay is designed for voltage monitoring
on generators, bus bars or other distribution systems. The
T3100 will signal when the voltage is out of limits for a preset
time period.
The T3100 consists of two circuits, one circuit for
overvoltage and one for undervoltage monitoring.
Each circuit has individual settings for voltage levels and
time delays.
Features & Benefits
FEATURES BENEFITS
Accepts high supply
voltage variation
Visual indication of power,
pick-up, and output trip
Direct line-line or lineneutral voltage supply (up
to 690 Vac)
Combining 2 relays in
same enclosure
Galvanic isolated inputs
DIN-rail or screw-mount
& adjustment by
potentiometers
Ensures correct operation in spite of voltage
supply fluctuations (fulfills marine class
requirement)
Provides quick and concise status information
Simplifies design and installation.
No need for PTs.
Economic solution. Monitoring both
undervoltage and overvoltage in same unit,
and ccupying less space in the switch panel
Protects the unit against high AC voltage and
currents from the installation including spikes
Easy installation
Ordering Information
ORDERING NUMBER
T3100.0010 230 V
T3100.0020 450 V 400 V
T3100.0030 110 V 100 V
T3100.0040 480 V 415 V
T3100.0060 127 V 120 V
Other vo ltages are available on request .
TERMINALS
1-3 2-3
Specifications
Overvoltage Level 100-12 0%
Delay 1-10 sec.
Hysteresis 1-10%
Undervoltage Level 80 -100%
Delay 1-10 sec.
Hysteresis 1-10 %
Max. Voltage 660 V
Voltage Range 70 -120%
Consumption
Frequency Range 40-400 Hz
Overvoltage Relay Normally de-energized
Undervoltage Relay Normally energized
Contact Rating AC: 250 V, 2 A, 250 VA
DC: 60 V, 2 A, 100 W
Overall Accuracy ±3% of highest value
Repeatability ±1%
Operating Temperature
Dielectric Test 2500 V, 50 Hz
EMC CE according to EN50081-1, EN50082-1, EN50081-2,
EN50082-2
Approvals Certified by major marine classification societies
Burn-in 50 hours before final test
Enclosure Material Polycarbonate. Flame retardant
Weight 0.5 kg
Dimensions H 70 mm (2.76”); W 100 mm (3.94”); D 115 mm (4.52”)
Installation 35 mm DIN rail or 4 mm (
5 VA at U
N
–20°C to + 70°C
3
/16”) screws
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t3100
Rev: 4-A-050213
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