Low Voltage Apparatus

FuseLineHRC Fuse LinksOFAA, OFAM

Technical Brochure

Brochure OF 1 GB 96-03

ABB Control Oy

Construction of the fuse link.

HRC Fuse-Links OFAA and OFAM

O

OFAA 00 125A

OFAA 1 250A

OFAA 2 400A

OFAA 3 630A

Strömberg Strömberg Strömberg

Strömberg

S00

346A

95M

DN

5447

is^

ic^

is^

ic^

= 44kA= 22kA

tt

tvts t

IS00

398A

Granulated quartzCeramic cylinder

currentarc

Prospective shortcircuit currentFusing element

OFAA gG Fuse-Links for Overloadand Short-Circuit ProtectionOFAA fuse-links are designed to meet all the requirements ofthe modern industrial installations and electrical power plants.Their breaking capacity is sufficient even at the highest short-circuit levels.The breaking capacity of OFAA fuses is over 100 kA, whenservice voltage is the same as rated voltage and frequency is50 Hz. This is valid for all fuse sizes.

OFAM aM Fuses for Short-CircuitProtection in Motor CircuitsOFAM aM fuse links provide reliable and fast short-circuitprotection for motor circuit equipment and cables. Breakingcapacity is 100 kA. Overload protection for motor circuit isprovided with an overload relay and a contactor.At high overload currents, the aM fuse link is faster than thegG fuse link, and at motor starting currents, the aM fuse link isslower than the gG fuse link.OFAM aM fuse link is now available even in IEC size 00 .Rated voltage is 690 V for all fuse sizes.

How a Fuse-Link Limits CurrentTo prevent danger, and damage to equipment and circuits,short circuit currents need to be intercepted extremely quickly.It is generally the quick temperature rise generated within theshort circuit current that causes equipment to breakdown.Fuse links are designed to react to this temperature rise and,therefore, their current limiting capability is very good.Fuse links contain granulated quartz which binds thetemperature generated in the arc created by short circuit. Atthe same time the pressure rises inside the fuse link and thefusing element ruptures.

2 ABB Control Oy

M~

O

OFAM 1/aM 250AOFAM

00/aM 160A

OFAM 3/aM 630A

OFAM 2/aM 400A

S00

347A

= melting time of fusing element= arc time= total operation time= current peak value limited by the fuse

tstvttic^

I t2pre-arc

I t2total

ts

ttI 2dt

I 2dt

0

0

S00355A

10x160 A

63A160A

Fuse Protection - Easy and Reliable

Superior Current Limiting CapabilityFuse links have an excellent current limiting capability. Withstandard cable and apparatus dimensions the protection isassured for contactors and overload relays. Short-circuit capacityremains very small.

High Safety FactorVisual inspection of a circuit clearly reveals when a fuse link hasbeen removed. Thus, service and maintenance can be safelycarried out.Fuses are tested according to IEC 947 standard requirements.IEC 947 type 2 coordination withstands up to 690 V. Type 2coordination states that all apparatus in the circuit must be in fulloperation after short circuit. Fuse protection guarantees thiswithout over dimensioning the apparatus.

Economical InstallationLife time costs of fuse systems are low. Fuse links which canwithstand a high fault level and fault current are available ateconomical prices. After tripping, only the fuse-link has to bechanged.Because the fuse links can be rapidly and easily replaced, plantdown-time and maintenance is substantially reduced with a fuselink system.

Simple SelectivityFuse links provide a simple procedure for selecting the right fusetype for your installation, without complicated calculations. Fusesprevent "blackouts". Only the fuse nearest a fault trips withoutupstream fuses (feeders or mains) beeing affected. Fuses thusprovide selective coordination.

The selectivity, see the pictures below and on previous page: Onthe feeder side the I2t

pre-arc value (in the picture fuse size 160 A)

has to be bigger than I2ttotal

on the load side(in the picture fusesize 100 A). I2t-values are on page 11 for OFAA- fuses and onpage 15 for OFAM- fuses.

S00

353A

M

S00

351A

M

S00

352A

100 A

63 A

S0

03

54

A

Time

Time

Current

Current

Perfect selectivity forall currents

Fuse

Reliable visible isolation when the fuse link isremoved.

Example of selectivity

U = 690VN

160A

100A

S00

356A

100A 160A

t s t vk

I I

S00

357A

Magnetic trip level settinge.g. 10 x 160 A = 1,6 kA

Fuses: Selectivity between sequential fuselinks easily achieved.

Breaker: Selectivity condition for MCCB hasto be separately calculated.

ABB Control Oy 3

Breaker Selectivity up to the magnetictrip level of supply side circuitbreaker only.

Intentionaltrip delay

Magnetictrip level

Thermal triplevel

Selective Non-selective

4 ABB Control Oy

Fuses Are Key Componentsto Reliable Protection

A reliable protection is cost-effectively achieved with fuselinksAcc. to IEC 947-4-1 standard regarding motorstarters, certain coordination categories are definedto protection.

Coordination type1 allows damage to contactorand thermal overload relay after a short-circuit.Operator must inspect starter afterwards andchange the apparatus. Failure to do this means thecircuit is not protected against overload which canlead to motor damage and cable fire.

Coordination type 2 guarantees that the starter isin full operation after short-circuit.

The fuse-links are protected acc. to coordinationtype 2 category even at 690 V. With breakers, toachieve coordination type 2, problems ariseparticularly at higher voltages. Generally can besaid that at higher voltages, the fuse system isstronger.

Fuse-Link OperatesIndependently of Corrosion

Because the fusing elements operate in a cylinder,they are not affected by their surroundings.Thus their protecting characteristicsremain unchanged year after year.Unlike circuit breakers, corrosioncannot damage the inside of the fuse link.

Fuse links are designed for differentenvironments:

• Universal fuses for installations under normalconditions.

• Fuse links for harsher environments,industrial fuses, provided with an extra thicksilver coating (20 µm).

Current I / In0 6

A

S00

399A

Starting currentof a motor

Thermaloverloadrelay

Rated currentof a motor

Operation time

Welding area of thecontactor contacts

Damaging areaof thermal relay

The breaking capacityof the contactor

Fuse

Contactor, thermal overload relay and fuse in a motor circuit.With the fuses the short circuit protection of coordination type 2 canbe easily ensured without over-dimensioning the components.

S00

350A

Relative advantage

Low

Type 1

High

Type 2

FuseCircuit breaker

Short circuit level

Selectivity level

Current

Voltage

Coordination

Fuses provide a reliable protection.

M~

Contents:

HRC Fuse link, type OFAA

Ordering information........................................................... 6OFAA -fuses, time-current characteristics .......................... 7OFAA -fuses, current limitation .......................................... 8OFAA -fuses, I2t -values ................................................... 10Dimension drawings ......................................................... 11

HRC Fuse link, type OFAM

Ordering information......................................................... 12OFAM -fuses, time-current characteristics ....................... 13OFAM -fuses, current limitation ........................................ 14OFAM -fuses, I2t -values .................................................. 15Dimension drawings ......................................................... 16

FuseLineHRC Fuse linksTypes OFAA, OFAM

ABB Control Oy 5

6 ABB Control Oy

In

[A]

246

10162025323540506380100125

162025323540506380100125160200250

160200250315400

315400500630

Un

[V]

690690690690690690690690690690690690690690500

690690690690690690690690690690690690690500

690690690690500

690690690500

FuseLineFuse links, type OFAAOrdering information

IEC -size

00

1

2

3

00

1

2

3

Type

OFAA 00 H2OFAA 00 H4OFAA 00 H6OFAA 00 H10OFAA 00 H16OFAA 00 H20OFAA 00 H25OFAA 00 H32OFAA 00 H35OFAA 00 H40OFAA 00 H50OFAA 00 H63OFAA 00 H80OFAA 00 H100OFAA 00 H125

OFAA 1 H16OFAA 1 H20OFAA 1 H25OFAA 1 H32OFAA 1 H35OFAA 1 H40OFAA 1 H50OFAA 1 H63OFAA 1 H80OFAA 1 H100OFAA 1 H125OFAA 1 H160OFAA 1 H200OFAA 1 H250

OFAA 2 H160OFAA 2 H200OFAA 2 H250OFAA 2 H315OFAA 2 H400

OFAA 3 H315OFAA 3 H400OFAA 3 H500OFAA 3 H630

OFAA 00 H2-H20OFAA 00 H4-H20OFAA 00 H6-H20OFAA 00 H10-H20OFAA 00 H16-H20OFAA 00 H20-H20OFAA 00 H25-H20OFAA 00 H32-H20OFAA 00 H35-H20OFAA 00 H40-H20OFAA 00 H50-H20OFAA 00 H63-H20OFAA 00 H80-H20OFAA 00 H100-H20OFAA 00 H125-H20

OFAA 1 H16-H20OFAA 1 H20-H20OFAA 1 H25-H20OFAA 1 H32-H20OFAA 1 H35-H20OFAA 1 H40-H20OFAA 1 H50-H20OFAA 1 H63-H20OFAA 1 H80-H20OFAA 1 H100-H20OFAA 1 H125-H20OFAA 1 H160-H20OFAA 1 H200-H20OFAA 1 H250-H20

OFAA 2 H160-H20OFAA 2 H200-H20OFAA 2 H250-H20OFAA 2 H315-H20OFAA 2 H400-H20

OFAA 3 H315-H20OFAA 3 H400-H20OFAA 3 H500-H20OFAA 3 H630-H20

24610162025323540506380

100125

162025323540506380

100125160200250

160200250315400

315400500630

690690690690690690690690690690690690690690500

690690690690690690690690690690690690690500

690690690690500

690690690500

Fuse links OFAA, industrial fusesIndustrial fuses with 20 µm silver coating.Type code includes one fuse link, but the delivery batch is 3 pieces/package.

Fuse links OFAA, universal fusesType code includes one fuse link, but the delivery batch is 3 pieces/package.

0.160.160.160.160.160.160.160.160.160.160.160.160.160.160.16

0.490.490.490.490.490.490.490.490.490.490.490.490.490.49

0.670.670.670.670.67

0.970.970.970.97

OFAA 3 630A

Strömberg

S00

407A

OFAA 2 400A

Strömberg

S00

406A

OFAA 1 250A

Strömberg

S00

405A

OFAA 00 125A

Strömberg

S00

404A

Weight[kg]

0.160.160.160.160.160.160.160.160.160.160.160.160.160.160.16

0.490.490.490.490.490.490.490.490.490.490.490.490.490.49

0.670.670.670.670.67

0.970.970.970.97

Ph

[W]

1.31.41.42.73.03.23.94.54.95.36.98.69.29.6

10.6

2.93.13.94.65.06.37.1

10.4121619232922

2223253135

30415148

1.31.41.42.73.03.23.94.54.95.36.98.69.29.6

10.6

2.93.13.94.65.06.37.1

10.4121619232922

2223253135

30415148

7ABB Control Oy

FuseLineFuse links, type OFAAMelting times

Values are valid also for industrial fuses OFAA_-H20.

Mel

ting

time

tv

/ s

OFAA -fuses, melting times

S00

362A

Short circuit current I p / A

8 ABB Control Oy

S00

363A

FuseLineFuse links, type OFAACurrent limitation

OFAA 00 -fuses, current limitation (cut-off characteristic)Values are valid also for industrial fuses OFAA_-H20.

Max

imum

val

ue o

f cur

rent

, pea

k va

lue

Is

/ kA

Prospective current I p / kA

Current peak without the fuse = 1.4 x √2 x Ip

9ABB Control Oy

FuseLineFuse links, type OFAACurrent limitation

OFAA 1 -fuses, current limitation (cut-off characteristics)Values are valid also for industrial fuses OFAA_-H20.

Max

imum

val

ue o

f cur

rent

, pea

k va

lue

Is

/ kA

Prospective current I p / kA

Current peak without the fuse = 1.4 x √2 x I

p

S00

365A

10 ABB Control Oy

FuseLineFuse links, type OFAAOFAA -fuses, Current limitation

Values are valid also for industrial fuses OFAA_-H20.

OFAA 2 och 3 -fuses, current limitation (cut-off characteristics)

S00

360A

Peak current without the fuse = 1.4 x √2 x Ip

Max

imum

val

ue o

f cur

rent

, pea

k va

lue

Is

/ kA

Prospective current I p / kA

11ABB Control Oy

FuseLineFuse links, type OFAAI2t -values, Dimension drawings

OFAA 1 HOFAA 2 HOFAA 3 H

d

e

fa

cg

b

e

af

d

b

g cLaji

OFAA00HOFAA1HOFAA2HOFAA3H

a b c d e f g

79 59 30 48 35 52 6135 62 49 65 40 74 6150 70 57 65 48 74 6150 84.5 72 65 60 74 6

S00

416A

OFAA -fuses, dimension drawingsValues are valid also forindustrial fuses OFAA_-H20.

OFAA 00 H

Type

SelektiivinenB > A + B

S00

422A

2 1 1

A1

B1B2

Selectivity

OFAA 00H 125, _1 H 250, _2H 400 and _3H 630 for voltage 500 V, other types for voltage 690 V.Values are valid also for industrial fuses OFAA_-H20.

I2t -values

1

10

100

1000

10000

100000

1 000000

00H

400

H6

00H

1000

and

1H

1600

and

1H

2000

and

1H

2500

and

1H

3200

and

1H

4000

and

1H

5000

and

1H

6300

and

1H

8000

and

1H

100

00 H

125

1H12

51

and

2H16

01

and

2H20

01H

250

2H25

02

and

3H31

52H

400

3H40

03H

500

3H63

0

2

2

I t / A s2 2

kokonais-I tsulamis- I t

Sulaketyyppi OFAA

S00

418A

Melting-I2t

Total-I2t

Fuse, type OFAA

12 ABB Control Oy

FuseLineFuse links, type OFAMOrdering information

Fuse links OFAM, universal fusesType code includes one fuse link, but the delivery batch is 3 pieces/package.

OFAM 00 aM 16-H20OFAM 00 aM 20-H20OFAM 00 aM 25-H20OFAM 00 aM 32-H20OFAM 00 aM 40-H20OFAM 00 aM 50-H20OFAM 00 aM 63-H20OFAM 00 aM 80-H20OFAM 00 aM 100-H20OFAM 00 aM 125-H20OFAM 00 aM 160-H20

OFAM 1 aM 50-H20OFAM 1 aM 63-H20OFAM 1 aM 80-H20OFAM 1 aM 100-H20OFAM 1 aM 125-H20OFAM 1 aM 160-H20OFAM 1 aM 200-H20OFAM 1 aM 250-H20

OFAM 2 aM 125-H20OFAM 2 aM 160-H20OFAM 2 aM 200-H20OFAM 2 aM 250-H20OFAM 2 aM 315-H20OFAM 2 aM 355-H20OFAM 2 aM 400-H20

OFAM 3 aM 315-H20OFAM 3 aM 355-H20OFAM 3 aM 400-H20OFAM 3 aM 500-H20OFAM 3 aM 630-H20

In

[A]

1620253240506380100125160

506380100125160200250

125160200250315355400

315355400500630

Un[V]

690690690690690690690690690690690

690690690690690690690690

690690690690690690690

690690690690690

00

1

2

3

1620253240506380

100125160

506380

100125160200250

125160200250315355400

315355400500630

690690690690690690690690690690690

690690690690690690690690

690690690690690690690

690690690690690

IEC -storlek

00

1

2

3

Typ

OFAM 00 aM 16OFAM 00 aM 20OFAM 00 aM 25OFAM 00 aM 32OFAM 00 aM 40OFAM 00 aM 50OFAM 00 aM 63OFAM 00 aM 80OFAM 00 aM 100OFAM 00 aM 125OFAM 00 aM 160

OFAM 1 aM 50OFAM 1 aM 63OFAM 1 aM 80OFAM 1 aM 100OFAM 1 aM 125OFAM 1 aM 160OFAM 1 aM 200OFAM 1 aM 250

OFAM 2 aM 125OFAM 2 aM 160OFAM 2 aM 200OFAM 2 aM 250OFAM 2 aM 315OFAM 2 aM 355OFAM 2 aM 400

OFAM 3 aM 315OFAM 3 aM 355OFAM 3 aM 400OFAM 3 aM 500OFAM 3 aM 630

Fuse links OFAM, industrial fusesIndustrial fuses with 20 µm silver coating.Type code includes one fuse link, but the delivery batch is 3 pieces/package.

Ph

[W]

1.11.41.62.12.93.74.86.37.49.5

12.0

2.93.54.76.07.1

14.217.718.3

9.812.016.025.1

30.2

20.8

29.2

40.0

Weight[kg]

0.160.160.160.160.160.160.160.160.160.160.16

0.490.490.490.490.490.490.490.49

0.670.670.670.670.670.670.67

0.970.970.970.970.97

1.11.41.62.12.93.74.86.37.49.5

12.0

2.93.54.76.07.1

14.217.718.3

9.812.016.025.1

30.2

20.8

29.2

40.0

0.160.160.160.160.160.160.160.160.160.160.16

0.490.490.490.490.490.490.490.49

0.670.670.670.670.670.670.67

0.970.970.970.970.97

OFAM 00 160AS

0040

8A

OFAM 3 630AS

0041

1A

OFAM 1 250AS

0040

9A

OFAM 2 400AS

0041

0A

M~

13ABB Control Oy

FuseLineFuse links, type OFAMMelting times

OFAM -fuses, melting times

Values are valid also for industrial fuses OFAM_-H20.

Short circuit current I p / A

M~

S00

364A

Mel

ting

time

tv /

s

14 ABB Control Oy

FuseLineFuse links, type OFAMCurrent limitation

OFAM -fuses, current limitation (cut-off characteristics)Values are valid also for indusatrial fuses OFAM_-H20.

M~

Current peak without the fuse = 1.4 x √2 x I

p

Prospective current I p / kA

S00

361A

Max

imum

val

ue o

f cur

rent

, pea

k va

lue

Is

/ kA

15ABB Control Oy

1

10

100

1000

10000

100000

1 000000

00aM

1600

aM20

00aM

2500

aM32

00aM

4000

aM50

00aM

6300

aM80

00aM

100

00aM

125

00aM

160

I t / A s2 2

Sulaketyyppi OFAM

kokonais-I t, 690Vkokonais- I t, 500V

2

2

kokonais- I t, 400V2

sulamis- I t, 400V2

S00

419A

1

10

100

1000

10000

100000

1 000000

1aM

501a

M63

1aM

801a

M10

01a

M12

51a

M16

01a

M20

01a

M25

0

2aM

125

2aM

160

2aM

200

2aM

250

2aM

315

2aM

355

2aM

400

3aM

315

3aM

355

3aM

400

3aM

500

3aM

630

I t / A s2 2kokonais-I t, 690V2

sulamis- I t, 400V2

Sulaketyyppi OFAM S00

420A

M~

FuseLineFuse links, type OFAMI2t -values

I2t -values

Total-I2t, 690 V

Total-I2t, 500 V

Total-I2t, 400 V

Melting-I2t

Fuse, type OFAM

Total-I2t, 690 V

Melting-I2t

Fuse, type OFAM

Values are valid also for indusatrial fuses OFAM_-H20.

SelektiivinenB > A + B

S00

422A

2 1 1

A1

B1B2

Selectivity

Dimension drawings

FuseLineFuse links, type OFAMDimension drawings

ABB Control OyP.O.Box 622FIN - 65101 VAASAFinland

Telephone +358-61-3160Telefax +358-61-3155 708

The technical data and dimensions are valid at the time ofprinting. We reserve the right to subsequent alterations.

Values are valid also for indusatrial fuses OFAM_-H20.

d

e

fa

cg

b

e

af

d

b

g cLaji

OFAM00aM 16...80OFAM00aM 100...160OFAM1aMOFAM2aMOFAM3aM

a b c d e f g

79 59 30 48 35 52 6 80 59 30 47 35 53 6135 62 49 65 40 74 6150 70 57 65 48 74 6150 84.5 72 65 60 74 6

S00

417A

Type

OFAM 1OFAM 2OFAM 3

OFAM 00

Waa

sa G

raph

ics

Oy,

3/1

996