ABB Thermal overload relays Data Sheet

Thermal overload relays

Type TA
Class 10

Thermal

Overload

relays

2

2

Description

• Available for starter construction with
A Line contactors and separate panel
mounting

• Designed for close couple mounting

• Separate base mounting available for all
overload relays

• Class 10 adjustable overload relays are
standard with all ABB Line starters

• Reset can also be adjusted to function as a
stop button

• Screwdriver guide holes

• All terminal screws are available from the
front

• UL File No: E48139

Tripping classes of the thermal overload relays

Standard classes in IEC 947-4-1 are classes: 10 A, 10, 20, 30. The tripping class indicates
according to IEC 947-4-1 the maximum tripping time in seconds under specifi ed conditions of
test at 7.2 times the setting current and specifi es tripping and non tripping times for 1.5 and 7.2
times the setting current. Mostly used class is 10 A.

Abstract from IEC 947-4-1

Tripping class 10 A 10 20 30

Max. tripping time
at 1.5 x setting current (s) 120 240 480 720
(warm state)

Tripping time at

7.2 x setting current (s) 2 – 10 4 – 10 6 – 20 9 – 30
(cold state)

At 1.05 x setting current no tripping

• CSA File No: LR98336

• Trip indication

• Remote trip and reset option available

• Single phase and phase unbalance protection

• Isolated alarm circuit (N.O.) contact

• Ambient compensation:

-25°C to +55°C (-13

• Manual test

• Manual or automatic reset

• Factory calibrated and tested

• Wide adjustment range

o

F to +131oF)

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Description

Thermal

Overload

relays

2

2

TA thermal overload relays are used with A Line contactors for the protection of
motors having a nominal voltage of up to 600VAC max per UL/CSA (690VAC and
800VDC per IEC).

Product range

• Standard relays:

Types: TA25DU, TA42DU, TA75DU, TA80DU, TA110DU, TA200DU and TA450DU
– TA25 to TA110 and TA200 are directly connected in the motor circuit.

– TA450DU relays are fed through a linear type transformer

• Special construction

Thermal overload relays with different certifi cations and approvals.
Relays for protection EEx e motors.

Construction and function

• General

Thermal O/L relays and their accessories meet UL, CSA and most other important
international standards (IEC), European standards (EN) and the most important
national standards (DIN-VDE, NFC-UTE, BS, etc.). They meet the certifi cation
and approval directives required throughout the world.

Thermal overload relays are 3 pole. The motor current fl ows through their bimetals
(1 per phase) which are indirectly heated. Under the effect of the heating, the
bimetals bend, cause the relay to trip and the position of the auxiliary contacts to
change.

The relay setting range is graduated in amps. In compliance with international and
national standards, the setting current is the motor nominal current and not the
tripping current (no tripping at 1.05 x setting current, tripping at 1.2 times setting
current).

The tripping curves (cold or warm starting, 3 phases and 2 phases) are shown on
page 2.14.

The relays are built to be self protecting in the event of an overload until the short
circuit protection device is activated.

Terminals L1, L3, L5

Frame size

TA....DU

Amp setting range

Signaling contact, (97, 98)

Manual test

Manual or automatic reset

Trip indication light

Tripping contact (95, 96)

Terminals T1, T2, T3

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TA25DU

Description

Thermal

Overload

relays

2

Application
Technical data

• All the relays have:

– Free tripping: the resetting button, even if held in, does not prevent tripping of the thermal overload relay in the
event of a fault.
– Temperature compensation
– Phase failure protection according to IEC 947-4-1: Within the limits of the setting range, a reduced tripping time, and
thus improved motor protection, is obrtained in case of a phase failure.
– Tripping class: 10A, for TA relays
– Test functions and resetting: see table below.

• Auxiliary contacts

The relays have two built in auxiliary contacts: NC marked 95-96; NO marked 97-98. Both contacts are physically separate
and can thus be used for 2 different circuits (control circuit and indication circuit).

Function of TA25DU – TA450DU thermal O/L relays

Resetting Relay tripped 95-96 Open Relay not tripped 95-96 Closed
97-98 Closed 97-98 Open

Contacts Manual Automatic Both manual and automatic
Effect of blue Resetting Yes No No
button indexed 95-96 Closed when the

on R button is pressed
(RESET ONLY)
97-98 Open when the
button is pressed

Effect of blue Resetting Yes No No
button indexed

on R/O button is released Closed when the button is released
(RESET/OFF)

button is pressed

Closed when the Open when the button is pressed

95-96

Open when the

97-98

{

No effect No effect

No effect

No effect

{

2

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Selection guide

Thermal

Overload

relays

2

2

Types TA25DU TA42DU TA75DU TA80DU
Main characteristics

Construction 3 pole with ambient temperature variation compensation.

Protection against single phase operation. Built in auxiliary contacts: 1N.O. + 1N.C.

Resetting Convertible: Manual to Automatic
Setting ranges Number 18 3 6 4

from 0.1 – 0.16A 18 – 25A 18 – 25A 29 – 42A
to 24 – 32A 29 – 42A 60 – 80A 60 – 80A

Mounted with contactors

Mounting kit No kit is required for mounting thermal O/L relays below contactors

Types of contactors A/AE/AL9
for combined mounting A/AE/AL12
A/AE/AL16

A/AE/AL26
A/AE/AL30 A/AE30

A/AE/AL40 A/AE40
A/AE/AF50

A/AE/AF63
A/AE/AF75

A/AE/AF95
A/AE/AF110

TA25DU – TA80DU

Mounted separately (i.e. separate from contactor)

Separate mounting kit DB25 DB80

Accessories

Tripping coil DS25-A
Resetting coil DR25-A
Terminal shroud Terminals protected against direct contact (without the addition of terminal shrouds)
Function markers BA5-50

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Selection guide

TA110DU – TA450DU

Overload

relays

2

2

Types TA110DU TA200DU TA450DU

Main characteristics

Construction 3 pole with ambient temperature variation compensation.

Protection against single phase operation. Built in auxiliary contacts: 1N.O. + 1N.C.

R

95 97

35

1

2

46

96 98

Resetting Convertible: manual to automatic
Setting ranges Number 2 6 3

from A 65 – 90 65 – 90 130 – 185
to A 80 – 110 150 – 200 220 – 310

Mounted with contactors

Mounting kit No kit is required for mounting thermal O/L relays See page 2.7.

Types of contactors
for combined mounting

A/AE/AF95
A/AE/AF110

A/AF145
A/AF185 A/AF210 + DT450/A300
A/AF260 + DT450/A300
A/AF300 + DT450/A300

Mounted separately (i.e. separate from contactor)

Separate mounting kit DB200 No kit required for separate mounting of thermal O/L relays

Accessories

Tripping coil
Resetting coil
Terminal shroud 1 LT200 – LT450 –
Function markers BA5-50

Thermal

1 Terminals protected against direct contact (without the addition of terminal shrouds)

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