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 BENEFITS
Simplified Circuit Diagram
1
2
U
L
1L2L3
Connection between 2 0 and 19 gives instant operation of Relay 2.
Connection between 2 0 and 17 gives delayed op eration of Relay 2.
Connection between 2 0 and 18 gives synchronized operation of Relay 1 and Rel ay 2.
Disconnecting the diode between 17 and 18 will disable operation of Relay 1 from
overc urrent.
Latching o utput relays can be rese t or disabled by b ridgi ng terminals 5 and 6 .
SUPPLY
3
T2500
(Overcurrent & Short-Circuit Relay)
11
I
1
12
13
I
2
14
15
I
3
16
19 17 18 20
SHORT CIRCUIT
OVERCURRENT
10
9
8
7
6
5
4
Ordering Information
ORDERING
NUMBER
T2500.0010 450 V 400 V 5 A Latching output, resetable
T2500.0020 230 V 5 A Latching output, resetable
T2500.0030 480 V 415 V 5 A Latching output, resetable
T2500.0040 450 V 400 V 1 A Latching output, resetable
T2500.0050 24 Vdc 5 A Latching output, resetable
T2500.0060 230 V 5 A De-energized extra output relay
T2500.0070 450 V 400 V 5 A De-energized extra output relay
T2500.0080 450 V 400 V 5 A
T2500.0090 480 V 415 V 5 A De-energized extra output relay
T2500.0100 24 Vdc 1 A De-energized extra output relay
T2500.0110 450 V 400 V 5 A
T2500.0120 24 Vdc 5 A
Other combinations and voltages are available on reques t.
TERMINALS
1-3 2-3
I
FUNCTION
N
De-energized extra output relay,
latching outputs
De-energized extra output relay,
latching short circuit output
De-energized extra output relay,
de-energized relay 1, no internal
power backup
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 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
Specifications
Overcurrent Trip Level 0.5-1.4 x I
Delay 3-30 sec.
Short-Circuit Trip Level 1.0-4.0 x I
Delay 0.1-1.0 sec.
Max. Voltage 660 V
Voltage Range 60-110 %
Consumption 5 VA at U
Continuous Current 2 x I
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
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 (
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
N
N
N
N
–20°C to + 70°C
3
/16”) screws
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t2500
Rev: 4-A-050213
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