Littelfuse T2400 User Manual

Protection Relays & Controls

Generator & Single-Function Protection–Overcurrent

T2400 SERIES

3-Phase Dual Overcurrent Relay

Simplified Circuit Diagram

1
2

U

3

11

I

1

12
13

I

2

14

15

I

3

16

L

1L2L3

Ordering Information

ORDERING
NUMBER

T2400.0010 230 V 5 A

T2400.0020 450 V 400 V 5 A

T2400.0030 110 V

T2400.0040 450 V 400 V 5 A

T2400.0050 480 V 415 V 5 A

T2400.0060 450 V 400 V 1 A

T2400.0070 450 V 400 V 5 A

T2400.0080 127 V 120 V 5 A
T2400.0090 24 Vdc 5 A

Latching o utput relays are reset by disconnectin g the power supply.
Other supply voltages and combinat ions are availabl e on request.

TERMINALS

1-3 2-3

100 V

T2400

SUPPLY

(3-Phase Dual
Overcurrent Relay)

II. OVERCURRENT

I

FUNCTION

N

5 A

Latching output on relay 1,
6-60 sec. delay on relay 1

Latching output on relay 1,
normally energized relay 1

I. OVERCURRENT

10

9
8
7

6
5
4

Description

The T2400 3-Phase Dual Overcurrent Relay includes two
combined overcurrent relays, designed for protection or
monitoring of generators and power transmissions. A typical
application is to use one of the overcurrent functions to trip the
generator circuit breaker, and the other overcurrent function to
trip a non-essential consumer.

The T2400 consists of two overcurrent circuits with similar
current settings and time delays. Each circuit detects the
highest of the 3 input currents and, if this exceeds the preset
level (0.5-1.4 x I

), the corresponding pick-up LED will indicate

N

and the delay timer will be started. After the preset time
(3-30 sec.) has expired, the corresponding output relay and
LED will be activated, provided that the current level was
exceeded for the entire delay time.

Features & Benefits

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

Provides quick and concise status information

output trip
Direct line-line or line-

neutral voltage supply
(up to 690 Vac)

Combining 2 relays in
same enclosure

Galvanic isolated inputs

Simplifies design and installation.
No need for PTs.

Economic solution for non-essential load
tripping, and occupying less space in the
switch panel

Protects the unit against high AC voltage and
currents from the installation including spikes

DIN-rail or screw-mount
& adjustment by

Easy installation

potentiometers

Specifications

Trip Level 0.5-1.4 x I
Delay 3-30 sec.
Max. Voltage 660 V
Voltage Range 60-110 %
Consumption Voltage 5 VA at U

Current 0.3 VA at I

Continuous Current 2 x I
Frequency Range 45- 400 Hz
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
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 (

N

N

N

N

3

/16”) screws

© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t2400

Rev: 4-A-050213