Littelfuse T3000 Series - Manual

Protection Relays & Controls
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t3000
Generator & Single-Function Protection–Frequency
T3000 SerieS
Frequency Relay
Description
The T3000 Frequency Relay is designed for frequency
monitoring on generators, bus bars or other distribution
systems.
The T3000 consists of two circuits, one circuit for over
frequency and one for under frequency monitoring. Each
circuit has individual settings for frequency levels and time
delays. The output relays are normally energized output
relays. The output relay for under frequency is activated at
frequencies higher than the preset value, while the output
relay for over frequency is activated at frequencies lower
than the preset value. This means that both output relays are
activated at frequencies within the interval between the under
and over frequency scale range.
OrderinG number
TerminalS
1-3 2-3
T3000.0010 230 V
T3000.0020 450 V 400 V
T3000.0030 110 V 100 V
T3000.0040 480 V 415 V
T3000.0050 127 V 120 V
Ordering Information
Simplified Circuit Diagram
Features & Benefits
Other voltages are available on request.
Specifications
Overfrequency Level 45-65 Hz
Delay 1-10 sec.
Underfrequency Level 45-65 Hz
Delay 1-10 sec.
Max. Voltage 660 V
Voltage Range 70-110%
Consumption 5 VA at U
N
Continuous Current 2 x I
N
Frequency Range 40-70 Hz
Output 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 –20°C to + 70°C
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 ( 3 / 16 ”) screws
10
9
8
7
6
5
L
1
(L)
L
2
(N)
OVERFREQUENCY
ALARM
UNDERFREQUENCY
ALARM
T3000
(Frequency Relay)
2
3
1
FeaTureS beneFiTS
Accepts high supply
voltage variation
Ensures correct operation in spite of voltage
supply fluctuations (fulfills marine class
requirement)
Visual indication of power,
pick-up, and output trip
Provides quick and concise status information
Direct line-line or line-
neutral voltage supply (up
to 690 Vac)
Simplifies design and installation.
No need for PTs.
Combining 2 relays in
same enclosure
Economic solution . Monitoring both
underfrequency and overfrequency in same unit,
and occupying less space in the switch panel
Galvanic isolated inputs
Protects the unit against high AC voltage and
currents from the installation including spikes
DIN-rail or screw-mount
& adjustment by
potentiometers
Easy installation
Rev: 4-A-050213