ABB Thermal overload relay TF42 Data sheet

Data sheet

Thermal overload relay TF42

Thermal overload relays are economic
electromechanical protection devices for
the main circuit. They are used mainly
to protect motors against overload and
phase failures. Starter combinations are
setup together with contactors.

1SBC101247F0010

Description

– Overload protection – trip class 10
– Phase loss sensitivity
– Temperature compensation from -25 … +60 °C
– Adjustable current setting for overload protection
– Automatic or manual reset selectable
– Suitable for three- and single-phase application
– Trip-free mechanism
– Status indication
– STOP and TEST function
– Direct mounting onto block contactors
– Sealable operating elements

Approvals

A

cULus UL 508

K

CB scheme

E

CCC

D

GOST-R

Marks

a

CE

ABS

RINA

DNV

Lloyd’s Register

P

Functional description

3~1~

A

1SBC101247F0010

1

2

3

4

5

6

7

8

9

1

Terminals (1L1, 3L2, 5L3)

2

Sealable operating elements

3

Current setting range

Adjustable current setting for overload protection

4

Status indication

5

RESET button

Automatic or manual reset selectable

6

Signaling contacts 97-98

7

Terminals 2T1, 4T2, 6T3

8

Tripping contacts 95-96

9

STOP button

Application / internal function

The thermal overload relays are three pole relays with bimetal tripping elements (1 per pole). The motor current flows through
the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal
elements become bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching
position (95-96 / 97-98). The contact 95-96 is used to control the load contactor.

The overload relays have a setting scale in Amperes, which allows the direct adjusting of the relay without any additional
calculation. In compliance with international and national standards, the setting current is the rated current of the motor
and not the tripping current (no tripping at 1.05 x I, tripping at 1.2 x I; I = setting current). The relays are constructed in way
that they protect themselves in the event of an overload. The overload relay has to be protected against short-circuit. The
appropriate short-circuit protection devices are shown in the table.

Operation mode

2CDC232001F0010

Contact 95-96 Contact 97-98 Status indication Comment

Trip state open closed

RESET state closed open ON

TEST manual reset mode open closed

TEST auto reset mode open closed while TEST is operated

STOP while device is in trip state open closed STOP button has no function

STOP while device is in RESET state open open while STOP button is pressed

Wiring diagram

RESET

M

9795

2T1 4T2 6T3

2 - 2CDC106023D0201

TEST

STOP

9896

2CDC232001F0009