Littelfuse T2800 User Manual

Protection Relays & Controls

Protection Relays

Earth-Fault Protection–Solidly-Grounded Systems

T2800 SERIES

Earth-Fault Relay

Simplified Circuit Diagram

12

SEC x 10

13

LATCHING

15

OFF

16

18

I x 10

N

19

7

8
9

10

1
2
3

T2800

(Earth-Fault
Relay)

5

6

Description

The T2800 Earth Fault Relay is part of the T-Line series with
modular units for protection, control and monitoring of
generators. The T2800 detects the magnitude of the current
and, if this exceeds the preset level (0.02-2 x I
LED will indicate and the delay timer will be started. After the

), the pick-up

N

preset time (0.1-10 sec.) has expired the output relay and the
corresponding LED will be activated, provided that the current
level was exceeded for the entire delay time. The T2800 has
a normally energized output relay. The relay is a latching relay
which can be reset or disabled.

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)

Wide range of combined
current and delay
settings

Galvanic isolated inputs

DIN-rail or screw- mount
& adjustment by
potentiometers

Ensures correct operation in spite of voltage
supply fluctuations (fulfils marine class
requirement)

Provides quick and concise status information

Simplifies design and installation.
No need for PTs

Enables versatile use as earth fault relay or
standard overcurrent relay. Combining more units
offers economic alternative to relays with inverse
time response.

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

Easy installation

Ordering Information

ORDERING NUMBER

T2800.00 230 V 5 A
T2800.01 450 V 400 V 5 A
T2800.02 127 V
T2800.04
T2800.05 480 V
T2800.08 230 V 1 A

Other combinations and voltages are availab le on request.

© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t2800

TERMINALS

1-3 2-3

120 V

24V DC+AC

415 V

I

N

5 A
5 A
5 A

Specifications

Trip Level 0.02-0.2 x IN or 0.2-2 x I
Delay 0.1-1.0 sec. or 1.0-10 sec.
Max. Voltage 660 V
Voltage Range 60-110 %

Consumption

Voltage 5 VA at UN

Current 0.3 VA at I

Continuous Current 2 x I
Frequency Range 45- 400 Hz

N

Output Relay Normally energized, latching, resetable
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
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

3

/16”) screws

Rev: 4-A-050213