Littelfuse T3300 User Manual

Protection Relays & Controls

Generator & Single-Function Protection–Voltage

T3300 SERIES

3-Phase Voltage Relay

Simplified Circuit Diagram

PHASE

1

PHASE

2

PHASE

3

17
18
19

21
22
23

25
26
27

T3300

(Voltage Relay)

(Inputs are isolated)

UNDERVOLTAGE

ALARM

OVERVOLTAGE

ALARM

16
15

14

12
11
10

Description

The T3300 Voltage Relay is designed for voltage monitoring
on generators, bus bars or other distribution systems. The
T3300 will signal when the voltage is under or over the
limits for a preset time period.

The T3300 consists of two circuits, one circuit for
overvoltage and one for undervoltage monitoring.
Each circuit has individual settings for voltage levels and
time delays.

Features & Benefits

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)

Combining 2 relays in
same enclosure

Galvanic isolated inputs

DIN-rail or screw-mount
& adjustment by
potentiometers

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. 3-phase monitoring of both
undervoltage and overvoltage in same unit,
and occupying less space in the switch panel

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

Easy installation

Ordering Information

TERMINALS

ORDERING NUMBER

T3300.0010 230 V
T3300.0020 450 V 400 V
T3300.0030 110 V 100 V

T3300.0040 480 V 415 V

Other vo ltages are available on request.

17-19
21-23
25-27

18-19
22-23
26-27

Specifications

Overvoltage Level 100-120%
Delay 1-10 sec.
Hysteresis 1-10%
Undervoltage Level 80 -100%
Delay 1-10 sec.
Hysteresis 1-10 %
Max. Voltage 660 V
Voltage Range 70 -120 %
Consumption
Frequency Range 40-400 Hz
Overvoltage Relay Normally de-energized
Undervoltage 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
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 1.2 kg
Dimensions H 70 mm (2.76”); W 150 mm (5.9”); D 115 mm (4.52”)
Installation 35 mm DIN rail or 4 mm (

5 VA at U

N

–20°C to + 70°C

3

/16”) screws

© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t3300

Rev: 4-A-050213