Switch disconnector fuse unit, Type 3KL andSwitch disconnector unit, Type 3KA

Application

Siemens pioneered the AC23Aconcept, now widely demanded bycustomers/consultants alike. 3KL/3KA unit are suitable for diverseapplications of switching rangingfrom no-load conditions tostringent conditions e.g. switchinghighly inductive loads. They can beused for mixed resistive, inductiveloads, capacitor banks and both inAC & DC circuits. Special executionfor corrosive atmosphere are alsoavailable.

Standards

The Switch disconnector fuse andSwitch disconnector conform toIEC 947-3 and IS 13947-3.

Note:Switch disconnector fuse units(SDF) were earlier called fuseswitch units.

�

We also offer SDFs for use

in corrosive atmosphere

Range

3KL : Switch Disconnector Fuse Unit

Open 32A, 50A, 63A, 100A,125A, 200A, 250A,315A, 400A, 630A, 800A

In SS 32A, 63A, 125A,Enclosure 250A, 400A, 630A

3KA : Switch Disconnector Unit

Open 63A, 125A, 250A, 400A,630A, 1000A, 1600A

India's most trusted and popular SDF / SD units.

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Benefits

a) Wide range

Single source for,SDFs, open upto 800 ASDFs, in SS enclosure upto630 ASDs, open upto 1600 A

b) No movement of fuses

Prevents loosening of fuses;hence reliable short circuitprotection.

c) Suitable for knife blade fuses

Reduced down time for fuseinspection/replacement.

d) Double break feature*

Isolates the fuses at both theends. Thus total protection tooperating personnel.

e) Wide service temperaturerange -20°C to 55°C

Siemens SDFs require noderating even upto service tempof +55°C. e.g. in a distributionfeeder with a load current of375A, you may use 3KL unitrated 400A.

If one uses an unit of othermake (which needs to bederated at 55°C, say by 15%),it can be used only upto340A. Thus a 630A unit of thatmake may be necessary forsame application. This meansapprox. 40% increase in costfor this particular example.

f) Maintenance free

Very high mechanical lifecoupled with an equally high

electrical life eliminates anyneed for contact replacement.

g) Positive isolation

All 3KL/3KA satisfy the isolationrequirements of IEC 947 /IS 13947 standards. Thisprovides greater safety tooperating personnel.

h) Positive indication of contactseparation

Siemens SDFs come with builtin POSITIVE OFF indicator. Forthe purpose of identifying theON/OFF state of the unitreliably, for obvious reasons, thehandle on the door is normallynot preferred by maintenancepersonnel / consultants.

In makes without aPOSITIVE OFF indicator, anauxiliary switch plus lampwould be required,amounting to approx. Rs. 300for 125A SDF. Thus in a typical125A unit of non-Siemensmake one has to reckon withan extra cost of approx. 10%.

Of course, the combination ofauxiliary switch plus pilot lampis still not as positive as an unitwith built in POSITIVE OFFindicator.

i) Adjustable drive shaft, to suitpanel depth

Siemens SDFs come with atelescopic shaft which allowsthe panel builder to readily useit for varying panel depth.

In the case of other makes,the non-availability of atelescopic shaft makes the

1. Switch disconnector fuse unit.2. Fuse-monitor

unit inflexible. Hence thepanel builder has to fabricatean additional bracket toadapt unit to his panel depth.Thereby increasing labourtime & cost e.g. approx.Rs. 50 for 125A unit.

j) Front Drive

Front drive incorporates doorinterlock with defeat facility, andpadlocking as a standard.

k) Neutral Link

Every SDF/SD is provided witha neutral link. Its terminals aresuitable for accommodatingneutral conductors of half thecross-section as those of themaximum permissible maincables.

l) Phase barriers as standard

Provides greater safety.

m) Fuse monitoring provision

All 3KL units have tapped holeson lyra contacts to allowmonitoring of fuse state usingSiemens fuse-monitor type3VU1300-MS00.

n) Suitable for AC loads, DCloads, capacitor application.

o) Mounting at 90o in thevertical plane possible.

p) Completely type tested atCPRI/ERDA.

* Single Break for 3KA 16, 1600A Switchdisconnector

3KL47 30

Positive OFFIndicator

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Contact SystemThe heart of Siemens SDF unittype 3KL is the unique movingcontact system (see illustration)comprising multiple silver platedcopper rollers which are springloaded, free to rotate around theiraxis and firmly anchored.

The spring loading is so designedthat the contact friction is minimisedand rollers rotate to avoid anytendency of locking or welding.Fixed contacts are knife blade type.Hence self cleaning feature isassured.

Advantages of the ContactSystem

• High short circuit making andwithstand capacity.Due to the multiple rollerdesign, each roller carries only afraction of the total current. Thisleads to reduction ofelectrodynamic repelling forceswhen the switch is in ‘ON’position. e.g., in 3KL61, thereare eight rollers at each breakand each roller carries 1/8th ofthe total current. When theswitch is ‘ON’, the forces ineach phase are reduced to 1/64of original.

The above feature along with thehigh closing speed of the unitresults in high making capacity.

At the same time, when thecontacts are closed, based onthe principle of increase inattraction due to electrodynamic

force between parallel currentpaths, the opening of contactsunder high short circuits [80kA(rms)] is prevented, thus leadingto high short circuit withstandcapacity.

• High breaking capacityThe high breaking capacitycorresponding to AC23Autilization category at 550V, ismainly achieved by currentsharing in multiple rollers perphase.

• Long electrical lifeDivision of current loadingexplained earlier leads toreduction in arcing time andhence lesser erosion ofcontacts thus giving longelectrical life.

• Long mechanical lifeLower operating torque, hencelonger mechanical life.

Switch disconnector unit type 3KA

Heavy duty TPN, double breakswitch disconnectors, type 3KA arealso available. The principle ofconstruction is similar to 3KL and,therefore, they have the same highperformance.

Switch disconnector fuse unit type 3KL

3KL25 30

3KL Contact System

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Selection Table for SDF unit and SD unit

Rated Suitable for HRC fuse type Order No. for SDF Order No. for SDF Order no. for Order no. forOperational unit in open unit in sheet-steel SD unit in open TIN plated SDFCurrent execution without housing without execution unit for corrosiveat 550V, 50Hz, 3ph Fuses Fuses atmosphere*

32A 3NA 38 DIN 3KL47 30-1YA00 3KL47 37-1YA00 – –

50A 3NA 38 DIN 3KL49 30-1YA00 – – –

63A 3NA 38 DIN 3KL50 30-1YA00 3KL50 37-1YA00 3KA50 30-1YA00 3KL50 30-3YA00

32A 3NWTIA BS 3KL47 30-1YJ00 – – –

50A 3NWTIA BS 3KL49 30-1YJ00 – – –

63A 3NWTIA/3NWTIS BS 3KL50 30-1YJ00 – – –

100A 3NA 38 DIN 3KL51 30-1YA00 – – –

125A 3NA 38 DIN 3KL52 30-1YA00 3KL52 37-1YA00 3KA52 30-1YA00 3KL52 30-3YA00

200A 3NA 31 DIN 3KL54 30-1YA00 – – –

250A 3NA 31 DIN 3KL25 30-1YA00 3LK25 37-1YA00 3KA25 30-1YA00 3KL25 30-3YA00

315A 3NA 32 DIN 3KL31 30-1YA00 – – –

400A 3NA 32 DIN 3KL41 30-1YA00 3KL41 37-1YA00 3KA41 30-1YA00 3KL41 30-3YA00

630A 3NA 33 DIN 3KL61 30-1YA00 3KL61 37-1YA00 3KA61 30-1YA00 3KL61 30-3YA00

800A 3NWTSLS BS 3KL81 30-1YJ00 – – –

1000A – – – – 3KA10 30-1YA00 –

1600A – – – – 3KA16 30-1YA00 –

Note : SDF/SD units supplied in Siemens drawout MCC’s and PCC’s are slightly different from the ones described herein. We request youto get in touch with our nearest sales office for replacement requirements.* In case of tin plated SDFs, please contact Siemens for derating factor.

Selection Table for 3KL/3KA AccessoriesDescription 3KL47/49/50 3KL51/52 3KL54/25/31/41 3KL61/3KL81

3KA50 3KA52 3KA25/41/61 3KA10/3KA16Order No. Order No. Order No. Order No.

Phase Barriers 3KX34 87-1YA 3KX34 87-1YA 3KX35 57-1YA 3KX35 87-1YA

Protection Guard Kit 3KX34 87-1YB 3KX35 27-1YB 3KX35 57-1YB 3KX35 87-1YB

Aux. Switch Kit (1NO + 1NC) 3SB14 00-0A 3KX35 22-1YC 3KX35 52-1YC 3KX35 82-1YC

Aux. Switch Kit (2NO + 2NC) – 3KX35 22-1YD 3KX35 52-1YD 3KX35 82-1YD

Front Drive with door -interlock, defeat and 8UC61 8UC62 8UC63 8UC64padlocking facility

Add-on switched neutral – 3KX35 28-1YN 3KX35 58-1YN 3KX35 88-1YN+

Castell interlock(2 locks & 2 keys) – – 3KX35 88-1YPF 3KX35 88-1YPF

Switch coupler to replace old – – 8UC92 55 8UC92 553KX drive by new 8UC drive

Depth Setting Template(for quick and correct 8UC60 46mounting of 8UC drive)

+ For 3KL61 and 3KL81 only.F The 11th place of the order number indicates the alphabet type of the lock & key; combinations available are A,B,C,D,E & F.

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Technical data Data Switch disconnector fuse unit Switch disconnector unit

3KL47 3KL49 3KL50 3KL51 3KL52 3KL54 3KL25 3KL31 3KL41 3KL61 3KL81 3KA50 3KA52 3KA25 3KA41 3KA61 3KA10 3KA16

Service temperature w/o derating -20oC to +55oC -20°C to +55°C

Rated continuous current 32A 50A 63A 100A 125A 200A 250A 315A 400A 630A 800A 63A 125A 250A 400A 630A 1000A 1600A

Rated insulation voltage 660V 660V

Rated voltage at 50Hz* 550V 550V

le/AC22 at 550V, 50Hz, 3ph 32A 50A 63A 100A 125A 200A 250A 315A 400A 630A 800A 63A 125A 250A 400A 630A 1000A 1600+A

le/AC23A at 550V, 50 Hz, 3ph 20A 32A 63A 100A 125A 200A 250A 315A 400A 630A 800A 63A 125A 250A 400A 630A 1000A 1600+A

Maximum permissible 32A 50A 63A 100A 125A 200A 250A 315A 400A 630A 800A 63A 125A 250A 400A 630A 1000A 1600+Afuse rating (backup HRC fusein case of 3KA)

Siemens HRC fuses - DIN 3NA38 3NA38 3NA38 3NA38 3NA38 3NA31 3NA31 3NA32 3NA32 3NA33 – Type 3NA3 @ @ (See note)

Siemens HRC fuses - Bolted 3NWTIA 3NWTIA 3NWTIA/ – – – – – – – 3NWTSLS @ @3NWTIS (See note)

Rated short circuit makingcapacity (rms) with maximumpermissible

Siemens HRC fuses - DIN 80kA 80kASiemens HRC fuses - Bolted 80kA 80kA 80kA – – – – – – – 80kA – – – – – – –

Fused short circuit withstandcurrent (rms) with maximumpermissible

Siemens HRC fuses - DIN 80kA 80kA

Siemens HRC fuses - Bolted 80kA 80kA 80kA – – – – – – – 80kA – – – – – – –

Rated short time withstand current not applicable 2kA 8kA 14kA 20kA 25kA 50kA 50kA(1 sec rating - rms)

Suitable for max. 12 14 29 46 58 95 116 145 186 294 374 29 58 116 186 186 467 Uponcapacitor bank (KVAR) enquiry

Mechanical life in switching cycles 15000 15000 15000 15000 15000 10000 10000 10000 10000 5000 3000 15000 15000 10000 10000 10000 5000 3000

Terminal size suitable for AIcables with lugs

– Main Terminals mm2 1x35 1x35 1x35 1x70 1x70 1x300 1x300 1x300 2x300 2x400 2x630 1x35 1x70 1x300 2x300 2x400 2x630 4x60x10++

– Neutral Terminal mm2 1x16 1x16 1x16 1x35 1x35 1x50 1x150 1x150 2x150 2x185 2x300 1x16 1x35 1x150 2x150 2x185 2x300 2x40x10++

Approx. weight of unit in open 0.65 0.65 0.7 2.7 2.7 7 7 7.5 8 14 15 0.65 2.7 7 8 8 11.7 16execution without drive and fuses Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs Kgs

Ratings of Aux. Switches

Continuous current 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A

Rated voltage, AC, 50Hz 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V 500V

DC 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V 600V

le/AC12 at 415V 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A

le/DC12 at 110V 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A

Maximum fuse rating for short 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10Acircuit protection : delayed actioncartridge type

@ Use fuses of reputed make only +AC 21 at 500V, 50Hz ++ Flats* Higher rated voltages - on enquiry

DC Ratings of Switch disconnector fuse unit and Switch disconnector unitType Type of connection DC rating

3KL 47 Two poles in series le/DC23 at 220V = 20ATwo poles in series Three poles in series le/DC23 at 440V = 20A

3KL 49 Two poles in series le/DC23 at 220V = 32A+ve -ve Three poles in series le/DC23 at 440V = 32A

3KL50/3KA50 Two poles in series le/DC23 at 220V = 63AThree poles in series le/DC23 at 440V = 63A

3KL51 Two poles in series le/DC23 at 220V = 100AThree poles in series le/DC23 at 440V = 100A

3KL52/3KA52 Two poles in series le/DC23 at 220V = 125AThree poles in series Three poles in series le/DC23 at 440V = 125A

3KL54 Two poles in series le/DC22 at 440V = 200A3KL25/3KA25/3KL31 +ve3KL41/3KA41 Two poles in series le/DC22 at 440V = 250A3KA613KL61 To Load Two poles in series le/DC22 at 440V = 630A3KA10 L = Load3KA16 Upon Enquiry

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Type: 3KL47 3/3KL49 3/3KL50 3 (Suitable for DIN fuses)

Type: 3KL51 3 / 52 3 (Suitable for DIN fuses)

Type: 3KL47 3/3KL49 3/3KL50 3 (Suitable for bolted fuses)

Switch disconnector fuse units in open execution

All dimensions are in mm.

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Type: 3KL61 3 (Suitable for DIN fuses)

Type: 3KL81 3 (Suitable for bolted fuses)

Type: 3KL54 3/3KL25 3/3KL31 3/3KL41 3(Suitable for DIN fuses)

Switch disconnector fuse units in open execution

Switch disconnector fuse type A B C D E F

3KL54 / 3KL25 / 3KL31 234 12.5 66.5 80 4 203/217

3KL41 245 12.5 70 75 6 217

All dimensions are in mm.

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Type: 3KL47 37 / 3KL50 37 / 3KL52 37

Switch disconnector fuse units in sheet steel enclosure

Type: 3KL25 37 / 3KL41 37 / 3KL61 37

Mounting Dimensions of sheet steel housing

Type of Switch disconnector fuse A B C D E F G H I J

3KL25 37 80 4 400 300 60 215 26.5 180 176 6.5

3KL41 37 75 6 400 300 60 215 26.5 180 176 6.5

3KL61 37 95 6 400 395 96 262 25 208 223.5 2.5

Type of Switch disconnector fuse A B C D

3KL47 37 / 3KL50 37 / 3KL52 37 220 180 30 30

3KL25 37 / 3KL41 37 370 180 15 60

3KL61 37 320 208 40 96

All dimensions are in mm.

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Type: 3KA50 3

Switch disconnector units in open execution

Type: 3KA52 3

Type: 3KA25 3 / 3KA41 3 / 3KA61 3

Dimensions in mm

Switch type A B C D E F

3KA 253 234 12.5 66.5 80 4 147

3KA 413 254 12.5 66.5 80 4 147

3KA 613 270 15 70 75 6 156

All dimensions are in mm.

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Type: 3KA10 3

Type: 3KA16

All dimensions are in mm.

Switch disconnector units in open execution

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8UC6 Front Drive – Some Features

�

� Door interlock defeat facilityPush through knockout (a) and actuate with any pin to defeatdoor interlock.

� Locking facility in “OFF” position.

� Basic design

a Handle with masking frame d Fixing screws

b Gasket e Drive coupler

c Door f Operating shaft

Installation

� Mounting position for switches and rotary mechanisms with“0” position.

� Door hinge spacing.

� Tolerances of drive coupler and operating or extension shaft.

� Required position of drive coupler with respect to handle.

Pull-out strength : The pull-out strength (=being pulled of theshaft or destruction of the mechanism) of locked mechanisms is³ 800N with pulling force exerted directly on the mechanism inthe direction of the shaft.

� Removing thedoor interlockThe hooks (b)serve only tosecure duringtransport.

Mounting position of Switch Coupler for 3KL 54/25/31/41/61/81 for coupling with 8UC63 and 8UC64 drives.

�

Drive coupler

Operating orextensionshaft

Door drilling dimensions (8UC61 / 8UC62) Door drilling dimensions (8UC63 / 8UC64)

8UC6 Front Drive – Installation and adjustment dimensions

* 3KL47/48/49/50/51/52, 3KA50/52, RHOEBO, 3VU9133/63, 3RV19.26/36/46** 3KL54/25/31/41/61/81, 3KA25/41/61/10/16, RHOFBO/JBO/MBO

All dimensions are in mm.

(Not to scale)

Siemens Ltd.Standard Products DivisionControl and Distribution ProductsFax : (022) 760 0076

Siemens Ltd. 069910 UNIFORMSGR-01-109-035This replaces SGR-01-109-034

‘Product development is a continuous process. Consequently,the data indicated in this leaflet is subject to change withoutprior notice. For latest issue contact our Sales Offices.’

Sequence for mounting the 8UC drive.

1. Mount the product insidethe panel.

2. Make the cut-outs on thepanel door. (Ref. Doordrilling dimensions below)

3. Mount drive coupler on theshaft of the unit.

4. Close the panel door fully,as is the case duringoperation.

5. Adjust the drive couplerwith the help of DepthSetting Template as shown.

6. Mount the handle of the8UC on the panel door.

(Not to scale)

SDF/SD Unit Front Drive L D H K K(Min) (Max)

3KL47/49/50 8UC61 36 28 66 180 2603KA50

3KL51/52 8UC62 62 28 66 180 2403KA52

3KL54/25/31/41 8UC63 140 40 88 231 2563KA25/41/61

3KL61/81 8UC64 200 40 88 285 3103KA10/16

Check for easymovement of doorinterlock.

1) Dimension tobe adjusted