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Protection Relays & Controls
Generator & Single-Function Protection–Overcurrent/Short-Circuit
T2500 Series
Overcurrent and Short-Circuit Relay
Description
The combined T2500 3-Phase Overcurrent and Short-Circuit
Relay is used for protection of generators and power
transmissions. The short-circuit relay protects against faults
causing high currents, and the overcurrent relay protects
against thermal damage.
Features & Benefits
Features
Accepts high supply
voltage variation
Simplified Circuit Diagram
1
2 SUPPLY
3
U
T2500
(Overcurrent & Short-Circuit Relay)
11
I1
I2
I3
SHORT CIRCUIT
12
13
14
15
OVERCURRENT
16
19
L1 L2 L3
17
18
10
9
8
7
6
5
4
20
Connection between 20 and 19 gives instant operation of Relay 2.
Connection between 20 and 17 gives delayed operation of Relay 2.
Connection between 20 and 18 gives synchronized operation of Relay 1 and Relay 2.
Disconnecting the diode between 17 and 18 will disable operation of Relay 1 from
overcurrent.
Latching output relays can be reset or disabled by bridging terminals 5 and 6.
Ordering Information
Terminals
Ordering
Number
1-3
2-3
T2500.0010
T2500.0020
T2500.0030
T2500.0040
T2500.0050
T2500.0060
T2500.0070
450 V
230 V
480 V
450 V
24 Vdc
230 V
450 V
400 V 5 A
5A
415 V 5 A
400 V 1 A
5A
5A
400 V 5 A
T2500.0080
450 V
400 V 5 A
T2500.0090
T2500.0100
480 V 415 V 5 A
24 Vdc
1A
T2500.0110
450 V
T2500.0120
24 Vdc
IN
400 V 5 A
5A
function
Latching output, resetable
Latching output, resetable
Latching output, resetable
Latching output, resetable
Latching output, resetable
De-energized extra output relay
De-energized extra output relay
De-energized extra output relay,
latching outputs
De-energized extra output relay
De-energized extra output relay
De-energized extra output relay,
latching short circuit output
De-energized extra output relay,
de-energized relay 1, no internal
power backup
Visual indication of
power, pick-up, and
output trip
Direct line-line or lineneutral voltage supply
(up to 690 Vac)
Combining 2 protection
functions in same
enclosure
Available with extra
output
Versions available with
separate 24 Vdc supply
Galvanic isolated inputs
DIN-rail or screw-mount
& adjustment by
potentiometers
BENEFITS
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, occupying less space in
the switch panel
Economic solution for non-essential load
tripping
Safe operation–Maintains protection
regardless of system voltage failure
Protects the unit against high AC voltage and
currents from the installation including spikes
Easy installation
Specifications
Overcurrent Trip Level 0.5-1.4 x IN
Delay
3-30 sec.
Short-Circuit Trip Level 1.0-4.0 x IN
Delay
0.1-1.0 sec.
Max. Voltage
660 V
Voltage Range
60-110%
Consumption
5 VA at UN
Continuous Current
2 x IN
Frequency Range
45-400 Hz
Output Relay
Normally energized
Extra Output Relay
Normally de-energized
Contact Rating
AC: 400 V, 5 A, 2000 VA; DC: 150 V, 5 A, 150 W
Overall Accuracy
±5%
Repeatability
±1%
Operating Temperature –20°C to + 70°C
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
DimensionsH 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
Other combinations and voltages are available on request.
www.BDTIC.com/littelfuse
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t2500
Rev: 4-A-050213