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Advanced Contact Technology MultilamTechnology The Multilam Principle Multifunctional contact interface for static and dynamic contact applications Kontaktlamellen Multilam Contacts Contact à lamelles

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Page 1: The Multilam Principle - DKSHdirect.dksh.com.au/files/content_docs/The Multilam principle.pdf · Advanced Contact Technology 4 11 1 1 1 RR R R R g k kkkn12 3 RR (RR) k 2 e f R R g

Advanced Contact Technology

MultilamTechnology

The Multilam Principle

Multifunctional contact interfacefor static and dynamic contact applications

KontaktlamellenMultilam ContactsContact à lamelles

Page 2: The Multilam Principle - DKSHdirect.dksh.com.au/files/content_docs/The Multilam principle.pdf · Advanced Contact Technology 4 11 1 1 1 RR R R R g k kkkn12 3 RR (RR) k 2 e f R R g

Advanced Contact Technology

2 www.multi-contact.com

Better contactsThe MC Multilam brought substantial improvements in relationto conventional contact systems.

AdvantagesThe Multilam soon developed into a whole system of contactelements. Its users recognised its outstanding advantages andwithin a short time a wide range of new application possibili-ties had evolved.

Basis for solutionsThis brochure is intended to show the principle and applicationof the Multilam and serves as an aid for designers and engi-neers in the development of high-quality and reliable contactsystems.

Further developmentsMulti-Contact uses the Multilam in all connectors in its productrange, and is constantly developing new components – also incollaboration with customers.

ExperienceMulti Contact offers total solutions because the installation andcorrect selection of the Multilams require experience andknow-how accumulated over many years.

There is always a solutionWith this extensive know-how Multi-Contact will be pleased tosupport you in your search for the best solution.

An ingenious ideaThe success story of Multi Contact isbased on the development of speciallyformed hard copper strips for electricalcontact, the so-called MC Multilams.

RoHSready

Directive 2002/95/EC on the restriction of the use of certainhazardous substances in electrical and electronic equipment

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Advanced Contact Technology

www.multi-contact.com 3

Contact part A

Multilam louver

Contact part B The Multilam principle 4

Contents

The various types of Multilams 5

Contact part A

Contact part B

Cu-louver

Steel strip

Special forms of Multilam 6

General contact technology 7 – 11

Application range of the Multilams, temperatures,plugging cycles, current-carrying capacity andcalculation of current-carrying capacity 12 – 13

Technical data and typical applications of Multilams 14 – 19

Special design features 20 – 21

List of termswith

explanations

Glossary 22

Page 4: The Multilam Principle - DKSHdirect.dksh.com.au/files/content_docs/The Multilam principle.pdf · Advanced Contact Technology 4 11 1 1 1 RR R R R g k kkkn12 3 RR (RR) k 2 e f R R g

Advanced Contact Technology

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1 1 1 1 1

1 2 3R R R R Rg k k k kn

� � � �

R R (R R )k e f� � ��

2

RRng

k�

Rk1 Rk2 Rk3 Rkn

The Multilam Principle

The louver contacts are produced from strips, and allow electri-cal contact to be made via a large number of defined, currentcarrying contact points.

Each louver forms an independent, spring loaded currentbridge, so that the many parallel louvers substantially reducethe overall contact resistance.

Contact part A

Multilam louver

Contact part B

Contact arrangement with torsion spring-type Multilam

Re1

Rf1

Rl

Rf2

I

Re2 I

Contact part A

Contact part B

Rf1Re1 Rl Rf2 Re2

The contact resistance Rk of a Multilam louver can be found by the follow-ing formula:

Re1 /Re2 = constriction resistance

R�

= internal resistance of louver

Rf1 /Rf2 = film resistance

I = nominal current

The contact resistance Rg of the Multilam is determinedas follows: (Parallel connection of louvers)

n = number of louversRg

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Advanced Contact Technology

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LA0 LA0-G LAIA

LAIB

LA-CU

LAII

LA-CUT/0,25/0

LAI-GSR

LA-CUT/0,25

LAIII LAIV LAV LAVII Twisted

The various types of Multilams

MC Multilams based on the torsion spring principle

Characteristic features of the Multilams

• high resistance to heat

• high electrical and thermal conductivity

• sufficiently high contact forces

• high number of contact cycles

• large operating range (LA-CUT)

• excellent resistance to corrosion

• easy to process (form- and electroplate) small space require-ment

• low cost contact elements

• resistance to vibration

• long product life

MC Multilams based on the leaf spring principle

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Advanced Contact Technology

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LA-CU

LA-CUT

Special forms of Multilams for special requirements

Contact part A

Contact part B

Cu-louver

Steel strip

Features

• very good electrical and thermal conductivity

• excellent spring characteristics

• low but adequate contact force keeps wear rates to an abso-lute minimum

• security against excessive elongation

• compact width, saves space

• resistant to high tempartures (up to 180°C)

Functional division between spring element (steel strip) andelectrical conducting element (Cu louver)

Features

• excellent electrical conductivity

• high continuous current-carrying capacity

• high short-circuit current-carrying capacity

• large radial tolerance absorption

• large operating range

• angular misalignment absorption

• easy to machine recess

• easy to install

Functional division between spring element (steel strip) andelectrical conducting element (Cu louver)

Angular misalignment absorptionAngular absorption +/-2° dependent on the installation mode,diameter and plug-in depth

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General Contact Technology

Connector Definitions

Plug connectors are electrical connectors that must not be connected or disconnectedwhen in use for their intended purpose (under load).

Connectors: – are designed to be disconnected without load only

Plug and socket devices: – are designed to be connected and disconnected under load

Adequate contact forceto break through the oxide film

Contact requirements

The higher the constriction resistance increases,the higher the risk of contact welding!

The contact force

The hardness of the contact material

The service temperature

Parameters influencing the constriction resistance:

the higher the contact force, the lower the constriction resistance

the harder the material, the higher the constriction resistance

With increasing temperature, the constriction resistance increases and then graduallybreaks down when softening and melting temperatures are reached.

Constant contact forceover its working life

Constant contact resistanceover its working life

Good heat dissipationduring continuous operation

Low constriction resistance Re

i.e. many and large a-spots

Good thermal-shock resistancein event of short-circuit

Low contact resistance

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Contact parts with pollution film Contact parts closed

apparent contact area

film barrier within the supporting contact area

quasi-metallic contacts

effective contact area (a-spots)

Flat contact surfaces

With flat contact surfaces there is no real danger of a welding effect, because the constriction resistance is spread out over manycontact points. Flat contact surfaces are very susceptible to the formation of pollution films.

When contact parts close, contact areas with different electrical characteristics are formed

Cu-rail under the microscope

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Ra ne �

� �

2R

a ne �

� �

2

2a 2a

Formation of contact transitions

Flat contactCurrent paths evenly distributed, but oxide film may not becompletely broken through

Point contactCurrent paths restricted, oxide film is broken through but thereis a high risk of welding

� = specific resistance of the contact material

Re = constriction resistance

n = sum of the a-spots

a = radius of the effective contact areas (a-spots)

1 < 5mV very good2 5mV – 12mV good

3 13mV – 25mV sufficient, usable4 26mV – 50mV critical unsure

5 51mV – 100mV unusable6 > 100mV failed

Assessment of contact qualityThe quality of a connector can be assessed by measuring the voltage drop at the rated current (DC) over the point of contact. Thevalues in the following table are based on practical experience:

Class Voltage drop at rated current (DC) Assessment

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Material Electricalconductivity

Thermalconductivity

Vickershardness

bending stresslimit

Max. workingtemperature

Application

mx mm�

2

Wm K�

HVN

mm 2 °C

CuZnBrass 15,5 121 150 – 180 > 290 85

Spring contact

Plug connectors

Soldering tabs

Parts for switches

Substrate material

For relay contacts

CuSn6Spring bronze 9,5 75 160 – 220 370 125

CuBe2Beryllium-copper 12 113 max. 450

hardenedmax. 1050hardened 180

CuNi18Zn20Nickel silver 3,3 33 170 – 200 > 390 125

CuNi9Sn2Wieland L49 Ca72 6,4 48 160 – 190 > 440 125

NiBeNickel-Beryllium 4 38 440 – 510

hardenedmax. 1600hardened 350 for higher

temperatures

Cu 57 380 – 390 60 – 120 250 – Cu-data forcomparison purposes

Comparison between electrical, mechanical and thermal characteristicsof copper alloys and spring contact materials

Material Thickness in µm Advantages Disadvantages

Au 0,15 – 2,5

– good chemical stability– low contact force allowed– very good electrical / thermal conductivity– DRY-CIRCUIT applications, low current and

low voltage– good soldering characteristics

– high cost– relatively soft– diffusion barrier required– not free from pores with thin layers

Ag 5 – 10

– excellent electrical conductivity– excellent thermal conductivity– easy to form when cold– for medium and high currents– low abrasion

– subject to sulphide tarnishing– more expensive than Sn– minimum contact force

Sn 1 – 10

– low cost– easy to plate– easy to tin at low temperatures– good soldering characteristics

– only for low no. of plugging cycles n < 100– higher plug-in and withdrawal force– higher contact force necessary 3,5N – 5N– higher abrasion– susceptible to oxidation

Comparison between plating materials Au, Ag and Sn for connectors

Contact requirements • low contact force

• high thermal conductivity

• high electrical conductivity

• abrasion resistant

• corrosion resistant

• suitable for plating

• low cost

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Basic requirements for the design of connectors

Vibration– vibration proof– shock proof

Insulation– insulating– high dielectric strength– form stable– rugged

Contact failure– corrosion– oxide film– environment condition– misalignment

Contact element– heat resistant– elasticity

Efficiency of contact– current capacity– voltage capacity– contact resistance

Type of connection– soldering– clamping– AxiClamp– crimping– wrapping

Contact area– plugging cycles– plating thickness– material– abrasion

Contact characteristics– contact resistance– insulation resistance

Price of contact– contact plating– insulation– termination type– contact elements

Frequency characteristics– capacitance– reflection factor– shield– surge impedance

Contact testing– electrical– dimensions– mechanical– thermal– climatic

Contact heat– thermal resistance– power dissipation– thermal conductivity

Contact pressure– adequate– constant

Standardization– assembly dimensions– contact spacing– specifications– number of poles

plug-in force

sliding forcewithdrawal force

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Advanced Contact Technology

12 www.multi-contact.com

Fields of application of Multilams

There is now a range of some 50 different Multilams, each ofwhich is designed for a specific application. Multilams with avery thin � strip thickness of 0,8mm to 0,125mm are usedwhere many plugging cycles are required. Connectors for fewplugging cycles and permanent contacts for press-fitting areequipped with thicker Multilams, e.g. 0,3mm to 0,5mm. Forextreme load conditions such as in switchgear, which are char-acterised by a large number of plugging or sliding operationsand high short-time currents, it is recommended to have theconnector fitted with guide rings.

Temperatures

The Multilams (Cu-Be alloy) are suitable for use at tempera-tures up to 180°C. In case of short circuits, temperatures up to250°C can be tolerated for a short time. The use of other alloysfor Multilams – e.g. NiBe – results in reduced current-carryingcapacity and conductivity. High-temperature connectors fortemperatures from 350°C – 400°C can be supplied withMultilams made of NiBe alloy. Multilams can also be used atextremely low temperatures. Experiments in liquid helium at4,2K have been successfully carried out.

Plugging cycle

The sliding forces of our connectors depend on several param-eters such as the type of Multilam, plating, the base materialsof the contact parts, the applied � lubricant etc. The data pro-vided here can be regarded as typical values. The coefficientsof friction typically vary around 0,35.In the technical data we state the � sliding force per louver fora mean friction coefficient of µr = 0,35. As a general rule thefollowing equation applies:

Standard high-current connectors are silver-plated to 5 – 10µm.These platings are suitable for approximately 5,000 pluggingcycles, provided they are coated with a thin film of lubricantbefore being used for the first time. For larger numbers of upto 30,000 plugging cycles, the Multilams and the contact sur-face which slides over them can be plated with a thicker layerof silver and a thin film of lubricant applied before their firstuse. Plugging cycles up to 100,000 or more require special sil-ver plating on both the Multila’s and the contact surfaces.

If more than 5,000 plugging cycles are required, MC recom-mends special � guide rings and “soft” (thin strip material)Multilams. Since “soft” Multilams have a reduced current-car-rying capacity, it may be necessary to fit several Multilams inparallel.

2-pole high temperature contact for an ambienttemperature of 350°C.

Multilam contact with guide rings

Strip thickness (Thickness of the Multilam strip)pages 14, 16, 18, 22

See

Lubricant, page 22See

Sliding force per louver / medium spring deflection,pages 14, 16, 18, 22

See

Fs = Sliding force of a contact

n = Number of louvers

µr = Friction coefficient

Fk = Contact force per louver accord. to tablepages 14, 16, 18

See

Example

Example

F n Fs r k� � �

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Advanced Contact Technology

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Current-carrying capacity

The current-carrying capacity of connections with Multilamsdepends upon a number of factors which can essentially be as-signed to two categories: contact resistance and environmen-tal conditions. Below the categories are further subdivided andthe relevant factors are named.

1. Internal resistance of the Multilam• Material resistance depends on the length and the con-

ductive cross-section

• Material of the louvers

2. Contact resistance between the louver andthe contact parts• Contact force Fk

• Size of the contact points

• Coating of the Multilam and the contact parts

• Oxidation, pollution layers

• Surface roughness of the contact parts

3. Resistance of the contact parts• Material

• Cross section of the contact parts

4. Environmental conditions• Ambient temperature

• External temperature influences

• Environmental conditions

The electrical values for Multilams stated in the table on pages14 – 19 are based on optimum conditions. That means, for in-stance, that contact surfaces with a roughness of N6 must beprovided with suitable and clean coatings, not oxidised or pol-luted. The ambient temperature is 20°C and the electricallyconducting cross-sections of the contact parts must beadequate.

Approximative calculation of thecurrent-carrying capacity

(Calculated with the values from tables on pages 14 – 19)

Number of louvers nfor round contacts:

Number of louvers nfor flat contacts:

Total resistance Rg

of a contact:

The rated continuous current In and the short-circuit currents Ik

(for 1s, 2s and 3s) and the rated peak withstand current are allcalculated in the same manner with the appropriate values:

I n Iwhole Multilam per louver� �

n = Number of louversd = Ø of contact = 3,1415...r = Contact spacing

(according to table pages 14,16,18)

n = Number of louvers� = Length of flat contactr = Contact spacing

(according to table pages 14,16,18)

Rg = Overall resistance of contact assemblyRk = Average contact resistance per louvern = Number of louvers

n = Number of louversI = currents

nd

r�

nr

RRng

k�

Plug assemblyNominal diameter= socket diameter

Socket assemblyNominal diameter= plug diameter

Flat assembly

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Advanced Contact Technology

14 www.multi-contact.com

Technical data and typical applications of MC Multilams

1) The sliding force is normally determined on the end product2) see catalogue 1 Powerline

Multilam type Typical Sizes Applications Dimensions Mechanical data

Wid

thof

Mul

tilam

Thic

knes

sof

Mul

tilam

strip

Con

tact

spac

ing

Con

tact

forc

epe

rlo

uver

with

med

ium

sprin

gde

flect

ion

Slid

ing

forc

epe

rlo

uver

with

med

ium

sprin

gde

fl.µ r

=0,

35

mm bmm

smm

rmm

Fk

NFs

N

LA0/...LA0/0,15LA0/0,20LA0/0,25LA0/0,30

> Ø 25> Ø 25> Ø 25> Ø 25

Switches,disconnectorsearth connectorssliding and rotaryconnectors

26262626

0,150,20,250,3

5555

38,51517

1,053

5,256

LA0-G

LA0-G/0,25 > Ø 25

Switches,disconnectorsearth connectorssliding contacts

25 0,25 2,5 9 3,15

LAIA/...LAIA/0,08LAIA/0,10LAIA/0,125LAIA/0,15LAIA/0,20LAIA/0,25LAIA/0,30LAIA/0,40LAIA/0,50

Ø 8 – Ø 20Ø 8 – Ø 20Ø 8 – Ø 20Ø 8 – Ø 20Ø 8 – Ø 20Ø 8 – Ø 20Ø 15 – Ø 20Ø 20 – Ø 70Ø 20 – Ø 70

Round contactsas in B8N toB20N 2),Flat contacts,as in fork plugs

17,517,517,517,517,517,517,517,517,5

0,080,1

0,1250,150,20,250,30,40,5

2,52,52,52,52,52,52,52,52,5

13471520

32,568105

0,351,051,42,55,25

711,423,837

LAIB/...

LAIB/0,08LAIB/0,10LAIB/0,125LAIB/0,15LAIB/0,20LAIB/0,25LAIB/0,30

Ø 25 – Ø 70Ø 25 – Ø 70Ø 25 – Ø 70Ø 25 – Ø 70Ø 25 – Ø 70Ø 25 – Ø 70Ø 25 – Ø 70

Round contactsas in B25N toB40N 2),switches,disconnectors,earth connectors,sliding and rotarycontacts

17,617,617,617,617,617,617,6

0,080,1

0,1250,150,20,250,3

2,52,52,52,52,52,52,5

13471520

32,5

0,351,051,42,55,25

711,4

LAII/...

LAII/0,15LAII/0,20

Ø 3,5 – Ø 20Ø 3,5 – Ø 20

Transformersand fork plugs

1414

0,150,2

1,51,5

1016

3,55,6

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Electrical data 1)

Rated current (A)per louver

l

A

n

Contact resistance (m�)per louver

R

m

k

Short circuit current (kA)per louver at

l skA

k1 1( ) l skA

k2 2( ) l skA

k3 3( )

Rated peak withstand current (kA)per louver

l

kA

p

0 7 14 21 28 35 42 49 56 63 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 0 0,7 1,4 2,1 2,8 3,5 4,2 4,9 5,6 6,3

Advanced Contact Technology

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1) valid for Multilams made from hard copper, silver-plated (mating part Cu, silver-plated)

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Advanced Contact Technology

16 www.multi-contact.com

Technical data and typical applications of MC Multilams

Multilam type Typical Sizes Applications Dimensions Mechanical data Thermal data

Wid

thof

Mul

tilam

Thic

knes

sof

Mul

tilam

strip

Con

tact

spac

ing

Con

tact

forc

epe

rlo

uver

with

med

ium

sprin

gde

flect

ion

Slid

ing

forc

epe

rlo

uver

with

med

ium

sprin

gde

fl.µ r

=0,

35

Con

tinuo

usus

ing

tem

pera

ture

Sho

rttim

ete

mpe

ratu

re

Ther

mal

resi

stan

cepe

rlo

uver

mm bmm

smm

rmm

Fk

NFs

N°C °C K/W

LA-CU

LA-CU/0,15-0,5 Ø 12 – Ø 400

Switchesdisconnectorsearth,connectorssliding and rotarycontacts

12 0,15 (Cu 0,5) 3,5 7 2,5 180 250 25

LA-CUT

LA-CUT/0,25 > Ø 50

Switchesdisconnectorsearth,connectorssliding and rotarycontacts

26 0,25 (Cu 1) 4 10 1 – 2 1) 150 250 25 – 30

LA-CUT/0,25/0 > Ø 50

Switchesdisconnectorsearth,connectorssliding and rotarycontacts

30 0,25 (Cu 1) 4 10 1 – 2 1) 150 250 25 – 30

1) The sliding force is normally determined on the end product

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Electrical data 1)

Rated current (A)per louver

l

A

n1l

A

n 2

Contact resistance (m�)per louver

R

m

k

Short circuit current (kA)per louver at

l s

kA

k11( ) l s

kA

k 22( ) l s

kA

k 33( )

Rated peak withstand current (kA)per louver

l

kA

p

0 10 20 30 40 50 60 70 80 90 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 0 0,6 1,2 1,8 2,4 3,0 3,6 4,2 4,8 5,4

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1) Valid for MC Multilam Contacts, silver-plated (mating part Cu, silver-plated)

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Advanced Contact Technology

18 www.multi-contact.com

Technical data and typical applications of MC Multilams

Multilam type Typical Sizes Applications Dimensions Mechanical data

Wid

thof

Mul

tilam

Thic

knes

sof

Mul

tilam

strip

Con

tact

spac

ing

Con

tact

forc

epe

rlo

uver

with

med

ium

sprin

gde

flect

ion

Slid

ing

forc

epe

rlo

uver

with

med

ium

sprin

gde

fl.µ r

=0,

35

mm bmm

smm

rmm

Fk

NFs

N

LAIIILAIII/0,125LASIII/0,15LAIII/0,20LAIII/0,30

Ø 2 – Ø 20Ø 2 – Ø 20Ø 2 – Ø 20Ø 2 – Ø 20

Test cables,probes

12121212

0,1250,1500,2000,300

0,8 – 1,00,8 – 1,00,8 – 1,00,8 – 1,0

3,572)

1,252,5

2)

LAIV

LAIV/0,10LAIV/0,125LAIV/0,15

Ø 0,5 – Ø 4Ø 0,5 – Ø 4Ø 0,5 – Ø 4

Test cables,probes,miniaturesockets

888

0,1000,1250,150

0,6 – 0,80,6 – 0,80,6 – 0,8

––

10

––

3,5

LAV

LAV/0,10LAV/0,125LAV/0,15

Ø 0,5 – Ø 4Ø 0,5 – Ø 4Ø 0,5 – Ø 4

Miniaturesockets

555

0,1000,1250,150

0,6 – 0,80,6 – 0,80,6 – 0,8

––3

––

1,05

LAVII

LAVII/0,125 Ø 0,8 – Ø 2,36Miniaturesockets 3 0,125 0,6 – 0,8 – –

1) The sliding force will be determined by the end product2) No indication of guide values possible, these values depend on the final use

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Electrical data 1)

Rated current (A)per louver

l

A

n1

Contact resistance (m�)per louver

R

m

k

Short circuit current (kA)per louver at

l skA

k1 1( ) l skA

k2 2( ) l skA

k3 3( )

Rated peak withstand current (kA)per louver

l

kA

p

0 1,5 3,0 4,5 6,0 7,5 9,0 10,5 12,0 13,5 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 0 0,04 0,08 0,12 0,16 0,20 0,24 0,28 0,32 0,36 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9

Advanced Contact Technology

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1) Valid for Multilams made from hard copper, gold-plated2) No indication of guide values possible, these values depend on the final use

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Special design features

With MC Multilam technology, users have available an extremelyflexible and individually adaptable contact interface.

Cylindrical contactsThe Multilams are fitted on cylindricalcontact rings. Either in a socket (fe-male), the mating part being a rigid pin,or on a pin (male) and the mating part arigid socket. Also for dynamic applica-tions (axial movement or rotatable).

Flat contactsare suitable for connecting busbars, ei-ther as a connector or a clamping unit.This allows connection and disconnec-tion with large busbars.

Fork contactsare suitable for connecting busbars tothe plug-in module system. Connectionsto parallel busbars can easily be madewith “floating” fork contacts.

Spherical contactsAccommodate angular misalignmentsand axial movements (sliding).

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Advanced Contact Technology

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MC Multilams

Countless applications and a basis for new developments

The first step to a solution foryour own contact

is a simple form to be filled in online with your contact re-quirements

You will find this form under:www.multi-contact.com > Downloads > Online Forms >Checklist / Inquiry Form

Send the generated pdf-form, together with possible addi-tions or additional requirements by mail to:[email protected]

Multi-ContactMulti-Contact

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Glossary

Strip thickness sThickness of the Multilam strip without plating.

Leaf spring MultilamIndividual louvers have a spring action as a result of theircurved shape. Leaf spring Multilam bands are usually gold ornickel plated.

Torsion spring MultilamMC Multilam type with individual louvers which deflect undertorsion. They are made from copper alloy and are usually silverplated.

Definition In1, In2

In1 = Nominal current under normal environmental conditionsand good contact quality according to table, page 9. In1 is thebasis for MC design.In2 = Nominal current under optimal environmental conditionsand sufficient contact quality according to table, page 9.

Internal resistance of the louverresults from the specific resistance of the louver material, thedistance the current must travel through the louver and the ac-tive cross-section.

StandardsIEC 61984 (VDE 0627):Safety requirements and tests for plug connectors.

IEC 61010-031 (VDE 0411-031):Safety regulations and hand-held accessories for test and mea-surement.

IEC 62271-1 (VDE 0671-1):High voltage switchgear and switch devices – general defini-tions.

Contact force Fk

is defined as the spring force of a louver at medium deflection.

Contact resistanceis the resistance of the point of contact between the Multilamand the contact parts.

Multilam recessGroove milled into the contact part for the “floating” mountingof a Multilam louver.

RoHS – 2002/95/ECEuropean Directive 2002/95/EC (“RoHS” for short) restricts theuse of certain hazardous substances in household equipment.Multilam strips are component parts, and as such are not di-rectly affected by this directive. They also contain none of thesubstances which are scheduled under the directive and cantherefore be safely incorporated in devices to which thedirective applies.

Multilam louverIndividual contact element of a Multilam strip; there are either� leaf spring louvers or � torsion spring louvers.

Contact spacing ris the distance between the centres of two � Multilam lou-vers.

Sliding force FS

is the purely frictional force of the deflected Multilam.The stated figures are average values obtained with a thin lu-bricant film and after 20 – 30 mating cycles. The values arehigher in new connectors. The sliding force is determined inthe end product, since its value is not determined solely by theMultilam.

Plug-in force FSt

is the maximum force needed in order to deflect the Multilamwhen mating the connector. It is made up of the spring forceand the frictional force.The plug-in force is determined in the end product, since itsvalue is not determined solely by the Multilam.It should be noted that the plug-in force is always greater thanthe sliding force. The plug-in force is usually not indicated.

LubricantsMC recommends the following lubricants:Grease (general electrical contacts):METALON HT-1,5-50ML (73.1052)KONTASYNTH BA100 SPRAY (73.1051)*Sliding grease:in SF6-Gas: Barrierta I EL-102*Press-fitting and sealing grease:Barrierta I S-402 or Barrierta I MI-202** from Klüber Lubrication, Munich.

Difference between plug-in force and sliding force

Mating way

Fo

rce

FSt FS

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Advanced Contact Technology

Headquarters:

Multi-Contact AG

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Ihre Multi-Contact Vertretung:Your Multi-Contact representative:Votre représentant Multi-Contact:

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.Multi-Contact

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Representações Lda

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