&ÁE EQ4»+ - gongkong

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TOR

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Motor Protection against overload

Thermal overload relays

Motor

• economic motor protection

against overload

• , small extensive

• possibilities for remote reset

• , small variety = low store costs

• cooperate design to contactors

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� EN 60-947-4-1 Motor overload protection EN 60-947-4-1.

� / Phase failure protection.

� Manual and automatic reset.

� Reset push-button adjustible

� Reset only

� 95-96Reset and opening tripping contact 95-96

� Setting knob for nominal current

� –25 °C ~ 55 °C Ambient temperature -25 to 55 °C

� Class 10/10ATripping class 10/10A

Functions

Thermal overload relays

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Strategies for Motor Protection

M

TOL

Therm. Overload-relay TOL

M

EOL

Electron. Overload-relay EOL

M

I >

Manual MotorStarter

M

ECD�

CM-LWNMotor-monitoringRelais CM-LWN

M

I >

C

CM-MSEThermistor-Protection Custorapid

Wiring Diagrams

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Protections Strategies

Thermal Overload Relay

acc. IEC60947-4-1

Protection against:

• thermal overload

• phase failure

• manual rest

• automatic start

Electronic Overload Relay

acc. IEC60947-4-1

Protection against:


• phase failure

• manual rest

• automatic start

• high accuracy

• less energy need

••high temperature

Manual Motor Starter

acc. IEC60947-4-1

Protection against:


• phase failure

• manual rest

• automatic start

••short circuit protection

• remote stop

Cos - Protec.

Cos Cos - monitoring

Protection against:


• phase failure

• manual rest

• automatic start

Thermistor Custorapid

temp. monitoring

Protection against:


• manual rest

• automatic start

• remote functions

Features

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Motor Protection

12 * Ie

Magnetic Release

3 Phase

2 Phase

Thermal Release

Magnetic Release

12 * Ie

Thermal Release to be

Provided by e.g. Thermal Overload Relay

Time Time

Tripping Curves

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1.2 * Ie 7.2 * Ie

1.05 x Ie No Tripping at 1.05 Ie within 2 hours

1.2 x Ie Tripping at 1.2 * Ie within 2 hours

Class 30 9 - 30 sec

Class 20 6 - 20 sec

Class 10 4-10 secMS325: Class 10A 2-10 sec

Ie – Ie = Adjusted Current

– Tripping Classes - Basic Data for Thermal Release

IEC 947-4-1

Please refere to IEC947-4-1 for exact data and characteristic

TIME

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Tripping curves

Tripping class : 10 / 10A Tripping class : 30

0.8 1 2 3 4 6 8

1

2

4

10

20

401

2

4

10

20

40

120

2-Phase

Tripping current, as multiple of set current

cold

3-Phase

warm

10

Tri

ppin

g tim

e

T 450 DU, DU 900 DUMin

utes

Seco

nds

3 4 6 8

cold

warm2-Phase

3-Phase

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Tripping Times, according to EN 60 947-4-1

1.5( )Max.

Tripping time at 1.5x setting current (warmstate)

1.05 At 1.05xsetting current

10 A 10 20 30Tripping classes

7.2( )Tripping time at 7.2x

setting current (cold state)

120 240 480 720

2 ... 10 6 ... 20 9 ... 30

no tripping

4 ... 10

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(IEC 60947-4-1)Tripping Curve acc. to Trip Classes (IEC 60947-4-1)

Thermal Overload Relays

Tripping time

Minutes

Class

Class

Seconds

Multiple of rated current

ABB :ABB Thermal Overloads with

• single phase protection

• temp. compensation

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T 7 DU : up to 5,5 kW / 400 V

Label carrier

Test

2 4 6 98 96

97 95

Reset H

A

(integrated)

(push: stop, 95/96 opens

pull : stop until reset, 95/96 opens,97/98 closes)

Test

(NO)Signalling contact (NO)

Setting

(for rated motor current)

Selection and reset

(autom./hand reset,push: hand-reset)

(NC)Tripping contact(NC)(for contactor coil)

for contactor typesB6 / B7

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ABB Assortment

TA25 to TA750,1 to 80 A

TA80 to TA20029 to 200 A

TA450 to T900130 to 850 A

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TA Overload Relays TA...

��

� ��

��

� � �

� ��

� ��

� ��

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Overload Relays

Types

M~3

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Products

ABB TA 450 SU ...T 900 SUABB Thermal Overload Relays – T A450 SU ... T 900 SU

With Current Transformers,

Class 30

�� Type TA 450 SU�� A210 A260 A300

�� 8 , 40 310 .8 setting ranges from 40 to 310 A

�� Type T 900 SU�� AF400 AF460 AF580 AF750

�� 4 , 265 850 4 setting ranges from 265 to 850 A

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Contactors with fitting relays


Type A2611kW

Type A110 55 kWType B6 / B7

5,5 kW

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Motor protection

How to plan with thermal overload relays?

2 4 6 9896

97

Reset

Test

H

A

Motor

2 4 6 9896

97

Reset

Test

H

A

Motor

2 4 6 9896

97

Reset

Test

H

A

Motor

2 4 6 9896

97

Reset

Test

H

A

Motor

Circuit breaker

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Motor protection

How to plan with circuit breakers?

Motor Motor Motor Motor

0

1

0

1

0

1

0

1

Tmax

&ÁE EQ4»+ - gongkong

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