Switch-Disconnector-Fuse Switch-Disconnector Type FN

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1 Switch-Disconnector-Fuse Switch-Disconnector Type FN

3 bout us Larsen & Toubro is a technology-driven USD 7 billion company that infuses engineering with imagination. The Company offers a wide range of advanced solutions in the field of Engineering, Construction, Electrical & Electronics, Machinery and Information Technology. L&T Switchgear, which forms part of the Electrical & Electronics business, is India's largest manufacturer of low voltage switchgear, with the scale, sophistication and range to meet global benchmarks. With over four decades of experience in this field, the Company today enjoys a leadership position in the Indian market with growing presence in international markets. It offers a complete range of products including controlgear, powergear, motor starters, energy meters, wires and host of other accessories. The products conform to international standards, carry CE markings and are KEM certified. L&T offers wide range of switch disconector fuse for manual operation. The range of switch disconector fuse conforms to the latest IEC/IS standards. The products are in line with design and quality standard associated with all L&T switchgear products. Switchgear Factory, Mumbai

Salient Features of SDF High making & breaking capacity Due to Quad break construction. High Electrical & Mechanical life.

Phase barriers : Interphase barriers are provided to eliminate the possibility of interphase short circuit. Large Ground Clearance to eliminate possibility of phase-ground flash over.

Quick break / Positive break Clear ON / OFF indicator Separate arcing / Current carrying zone High clearance & Cree pages Separate bridge for each pole Maximum ground clearance Phase barrier &

Suitable for vertical & horizontal orientation Wide range of Spares & ccessories Handle coupling as per IS 623 The handle coupling has the following user-friendly features.

Built-in padlocking arrangement to lock the unit in either ON or OFF position. The handle coupling can take a mismatch or ±3mm in all directions.

4 Salient Features of SDF High making & breaking capacity Due to Quad break construction. High Electrical & Mechanical life. Compact construction : To ensure light weight low operating torque switch which saves panel space. Easy to maintain contacts. Phase barriers : Interphase barriers are provided to eliminate the possibility of interphase short circuit. Large Ground Clearance to eliminate possibility of phase-ground flash over. Features of FN series : Compact design saves space Electrodynamic Compensation Quad break Contact System Full C - 23 rating for the complete range Highest fused Short Circuit Capacity Quick make / Quick break / Positive break Clear ON / OFF indicator Separate arcing / Current carrying zone High clearance & Cree pages Separate bridge for each pole Maximum ground clearance Phase barrier & Terminal Shroud as a standard accessory Fuse stationary & Isolated from both sides Direct access to mounting & terminal screws Generous terminal capacity Replaceable contacts for enhanced life Suitable for vertical & horizontal orientation Wide range of Spares & ccessories Handle coupling as per IS 623 The handle coupling has the following user-friendly features. Easy fixing of handle on panel door by two screws. Door interlock for safety of operating personnel when switch is ON. The interlock can be defeated if required. Built-in padlocking arrangement to lock the unit in either ON or OFF position. The handle coupling can take a mismatch or ±3mm in all directions. Clear ON / OFF indication is provided on the switch (by a red pointer) Large terminals to accommodate luminium bus bars. Terminal shrouds, to protect against phase-phase short circuit The terminals can be shrouded for protection against phase-phase short circuit through an external conducting path and also for protection against accidental human contact to live terminals. Contact System : Contact system is QUD BREK. There are no. of parallel moving contacts per pole per break. Hence, better rc Quenching & more electrical life of contacts. Each pole has separate bridge, carrying the moving contacts, achieving a high order of interphase separation & avoiding phase-phase flash over. Built-in neutral : Switch-Disconnector-Fuse consist of an integral neutral, making the units suitable for 3 phase, 4 - wire application. FN 32 / 63 has switched neutral while higher ratings have isolable neutral. Mechanism : This mechanism is front operated quick-make / quick-break and independent of speed of operation. Fuses remain stationery during switching operation. Fuses are isolated from both sides. This offers safety to operating personnel while replacing fuses. The Switch-Disconnector-Fuse units can be mounted at any angle in a vertical plane. SDF Interior in Sheet Steel Enclosure : Complete range of S-D-F is also available in attractive powder coated sheet steel enclosures. FN 32 / 63 in sheet steel enclosure comes fitted with gland plate. 1

5 Technical Data Switch-Disconnector-fuse Units. Type FN Conforms to IS13947 (part-3) / IEC Type Designation FN 32 FN 63 FN FN 125 FN 160 FN FN 250 FN 315 FN FN 630 FN 00 No. of Poles Neutral # Service temperature Rated operational voltage (U ) V e Rated insulation voltage (U ) Rated impulse withstand voltage (U ) kv imp Rated Frequency Conventional enclosed thermal 0 current at 40 C (I ) the Rated operational current (l ) e C - 23 utilization category Rated making capacity (436 V, coso=0.35) Rated breaking capacity (436 V, coso=0.35) Rated fused short circuit current k with L&T fuses, rating / Type / Size Capacitor duty - Connected- V, Hz kvr Mechanical life (Operating cycles) Terminal capacity (main) Terminal capacity (neutral) Terminal screw DC Rating at 220 V DC No. of poles in series, utilization category at rated current i 0 mm mm mm C V Hz 2 2 Switched * 256* / HF / 14x51 63 / HF / 14x M 6 x 12 Switched * 504* M 6 x 12 Isolable 0 00 / HN / M x 20 Isolable /HN / M x 20 Isolable / HN / M x 20 Isolable 3, DC-23 3, DC-23 2, DC-23 2, DC-23 2, DC-23 2, DC-23 2, DC-23 2, DC-22 2, DC-22 2, DC-22 2, DC-22 B / HN / M 10 x 30 Isolable / HN / M 10 x 30 Isolable / HN / M 10 x 30 Isolable 0 3 / HN / x 240 M 12 x 40 Isolable / HN / x 625 M 16 x 50 Isolable / HN / x 625 M 16 x 50 * Power factor = 0.45 as required in IS (part 3). # For FN 125 to FN 00 Switched - Neutral is available as accessory. FUSE

6 Technical Data Switch Disconnector - Type FN Conformance to IS13947 (part-3) / IEC Type Designation FN 32 FN 63 FN FN 125 FN FN 250 FN 315 FN FN 630 FN 00 FN 0 No. of poles Neutral Switched Switched Isolable Isolable Isolable Isolable Isolable Isolable Isolable Isolable Isolable Service temperature 0 C Rated operational voltage (U ) e V Rated insulation voltage (U ) i V Rated impulse withstand voltage (U ) imp kv Rated frequency Hz 0 Conventional Enclosed thermal current at 40 C Rated operational current le C 20 utilization category C 21 utilization category C 22 utilization category C 23 utilization category DC rating at 220 V DC No. of poles in series, utilization category at rated current 3, DC-23 3, DC-23 2, DC-23 2, DC-23 2, DC-23 2, DC-23 2, DC-22 2, DC-22 2, DC-22 2, DC-22 2, DC-22 B Rated making capacity (436 V, coso-0.35) Rated breaking capacity (436 V, coso-0.35) Capacitor duty - V Hz kvr Mechanical life (operating cycles) Terminal capacity (main) 2 mm x 2 x x x 625 Terminal capacity (neutral) 2 mm Terminal screw mm M 6 x 12 M 6 x 12 M x 20 M x 30 M 10 x 30 M 10 x 30 M 10 x 30 M 12 x 40 M 16 x 50 M 16 x 50 M 16 x 50 Short circuit withstand current k (duration 1 secs)

7 Spares & ccessories Wide range of spares & accessories are available for Switch-Disconnector-Fuse units type FN. ccessories Switched Neutral : In FN 32 / 63 Switched-Neutral pole is an integral part of the Switch-Disconnector-Fuse. For higher ratings, a double break, site-fitted switched neutral pole can be provided. This is operated by the main mechanism. Terminal Shroud : The terminals can be shrouded for protection against phase-short circuit through an external conducting path and against accidental human contact with live terminals. Mechanical Interlock Kit : Two Switch-Disconnector-Fuse units can be interlocked by mechanical interlock kit. fter interlocking, the following three positions are possible. - SDFU 1 in ON position SDFU 2 in OFF position - SDFU 2 in ON position SDFU 1 in OFF position - Both SDFUs in OFF position Hence two mechanically interlocked SDFUs can be used as a change over switch Castell Interlock : Switch-Disconnector-Fuse units can be locked on OFF position with help of castell interlock. Castell interlock can also be used to interlock two S-D-F units. (Different variety of locks are available) Shaft Extension Kit : Shaft length can be increased with shaft extension kit. Fuse Puller : fuse puller is provided which facilitate easy & safe removal of fuses. Handle Coupling (type & B) : lrrespective of the switch orientation (vertical or horizontal), operation in any of the four quadrants is possible by selecting right handle coupling (Refer table on next page) uxiliary Contacts : 1 NO + 1 NC auxiliary contact is available as an accessory. This can be suitably wired in the control circuit. Rated operational current l e (C - 15) - 4 Rated operational voltage U e - Spares Moving Contact : Moving contacts are available for ranges FN to FN 00. One set of moving contact spare contains, spring, guide & moving contact. Front Housing assembly : Complete front housing assembly is available from FN to FN 00. Spares & ccessories for FN Range - Ordering Information ccessories Spares Moving Contact Front Housing ssembly Terminal Shroud Kit Switched Neutral Kit ux. Contact (1 NO + 1 NC) Handle Coupling (Type - ) Handle Coupling (Type - B) Handle Coupling (Type - CE) Fuse Puller Versions FN 32 FN 63 FN FN 125 / 160 FN FN 250 FN 315 FN FN 630 FN 00 Shaft Extension Kit Mechanical interlock Kit Castell Lock (Type -Type M) Not vailable Not vailable SK91190 Built-in SK91302 SK91257 SK91277 SK91337 SK9115 Not vailable Not vailable Not vailable ST31677 SK91373 SK91137 SK95233 SK9132 ST3167 SK9125 SK9127 SK95600 SK95232 SK91374 ST31679 SK SK00344 SK91335 SK95516 SK91329 SK91375 ST31729 SK91376 SK91377 SK9137 SK91379 ST3161 SK91346 SK95517 Not vailable SF90126 ST3162 SK91330 SK91259 SK91279 SK91331 SK95545 SK SK00356 ST3163 ST31730 SK91347 SK Ordering Suffix for all.

8 Selection of Handle Seen From Front of the Door Sr. No. Handle (off) Position Operating Quadrant (hand) Switch Orientation Door Cut-out Handle Coupling Type OR B OR 0 3 B OR 0 4 OR 5 OR 6 B OR 7 1 B 0 OR 1 0 OR Note : rrow ( ) indicates position of Interlock Defeat Key Type : supplied as standard with all S-D-Fs Type B : supplied on request 7

9 Overall Dimensions Switch-disconnector-fuse Type DIN FN 32 / 63 Overall Dimensions - FN 32 / 63 ssembly of Handle Coupling on Door - FN 32 / SQ MIN SQ Hinge uxiliary Contact Block (optional ccessory) 29.6 N Switch in Off Position Cheese Head Screws Door Thickness Max. 2 mm. 150 ± 3 40 Clear Inside of the Cubicle N Terminal Shroud (Optional ccessory) 2 Mounting Holes For M4 Screws Drilling Details FN 32 / Drilling Details on Door For Mounting Handle Coupling Seen From Front of The Door 40 ±0.25 Drilling Details on Base Plate For Mounting Switch Seen From Front of The Door 2 Holes Ø4 ± 0.1 For M3.5 Screws 5 Holes Ø32 ± Holes Suitable For M4 Screws 40 ± Operating Shaft Center Mismatch ± 3 Permissible Note: ll dimensions are in mm.

10 Switch-disconnector-fuse Type DIN FN / 125 / Phase Barrier Terminal Shroud (Optional ccessory) 216 (with ux. Contact Block) ux. Contact Block (Optional ccessory) TYPE FN / 125 FN B M5 Screw Earthing 20 B Ø M 6 Screw Switch-disconnector-fuse Type DIN FN / B 247 (with ux. Contact Block) 23 1 M10 Bolt C D FN 125 Phase Barrier ux. Contact Block (Optional ccessory) Terminal Shroud (Optional ccessory) M Bolt M5 Screw Earthing Ø12.5 Hole TYPE FN FN B C D Note: ll dimensions are in mm. 9

11 Overall Dimensions ssembly of Handle Coupling on Door FN / 125 / 160 / / MIN. Padlock, Clamp Ø5 To Ø.5 mm. SQ. 90 Hinge Cheese Head Screw Push Here To Defeat Interlock Switch In Off Position Door Thickness Max. 2 mm ± 3 Clear Inside Of The Cubicle Dimension FN / 125 / 160 FN FN Drilling Details FN / 125 / 160 / / 250 Drilling Details on Door For Mounting Handle Coupling Seen From Front of The Door Drilling Details on Base Plate For Mounting Switch Seen From Front of The Door B C 60 ± Holes Ø4 ± 0.1 For M3.5 Screws Holes Ø50 ± ± 0.25 Operating Shaft Center Mismatch ±3 Permissible 4 Holes Suitable For M6 Screws D Type B C D FN / 125 / FN FN Note: ll dimensions are in mm. 10

12 Switch-disconnector-fuse Type DIN FN 315 / Phase Barrier B ux. Contact Block (with ux. Contact Block) Bolt'c' 5 9 Terminal Shroud Type FN 315 FN B C M10 M M5 Screw Earthing M10 Bolt Switch-disconnector-fuse Type DIN FN 630 / 00 Phase Barrier FUSE ux. Contact Block (with ux. Contact Block) Terminal Shroud M5 Screw- Earthing M12 Bolt M16 Bolt Note: ll dimensions are in mm. 11

13 Overall Dimensions ssembly of Handle Coupling on Door FN 315 / / 630 / min Padlock Clamp F 5 To F.5 mm O SQ. 90 Hinge Cheese Head Screw Push Here To Defeat Interlock Switch In Off Position Type FN 315 / FN 250 FN 630 / FN Door Thickness Max. 2 mm 250 ± 3 Clear Inside of The Cubicle Drilling Details FN 315 / / 630 / 00 Drilling Details On Door For Mounting Handle Coupling Seen From Front Of The Door Drilling Details On Base Plate For Mounting Switch Seen From Front of the Door Hole Ø50 ± ± ± 0.25 Operating Shaft Center Mismatch ± 3 Permissible Holes Suitable For M Screws Holes Ø4 ± 0.1 For M3.5 Screws Type FN 315 / FN FN 630 / FN Note: ll dimensions are in mm. 12

14 FN In Sheet Steel Enclosure O C F J H G I O 4 Holes Ø 6.5 K B E L Type FN 32 / 63 FN / 125 / 160 FN FN 250 / 315 / FN 630 / 00 Extreme Overall dimension B C Basic Enclosure dimension D E F Cutout for Cables G H Gl and Plate mounting dimension I J Enclosure mounting dimension K L Note: ll dimensions are in mm. 13

15 Overall Dimensions Switch-Disconnector-Fuse Type Bolted 6 SQ. FN 32 / 63 FN / 125 O 37 Max Fuse Size 4 ccording to IS ux. Contact Block Mounting Holes For M4 Screws Terminal Shroud Terminal Shroud (optional ccessory) M5 Screw Earthing M6 Screw 20 M FN / 250 Phase Barrier 111 B %%C42 MX (MX.) E Fuse Size B2 ccording To Is13703 M10 Bolt C ux. Contact Block D (with ux. Contact Block) Terminal Shroud M Bolt DIM B C D E Fuse FN M5 Earthing Screw FN Note: ll dimensions are in mm. 14

16 Switch-Disconnector-Fuse Type Bolted FN 315 / Phase Barrier O66 Max. 111 Fuse Size ccording to Is (refer Table) ux. Contact Block 137 B (max.) Refer Table 23 (refer Table) 174 Bolt-c (refer Table) (with ux. Contact Block) Terminal Shroud M5 Screw Earthing M10 Bolt Switch-Disconnector-Fuse Type Bolted FN 630 Phase Barrier Fuse Size C2 ccording To Is M16 Bolt O77 Max (max.) (with ux. Contact Block) ux. Contact Block Terminal Shroud M5 Screw Earthing M12 Bolt Note: ll dimensions are in mm. 15

Cylindrical HRC Fuses Fuse Links Type HF (Fuse links with cylindrical contact caps) Conform to IEC60269 / IS13703 Low watt loss - Saving in power Low let through energy High breaking capacity - 0 k

17 Cylindrical HRC Fuses Fuse Links Type HF (Fuse links with cylindrical contact caps) Conform to IEC60269 / IS13703 Low watt loss - Saving in power Low let through energy High breaking capacity - 0 k Rated voltage - V Immediate fault indication through Red Pop up indicator Lower power loss in our fuses result in cooler running of associated products Ordering Details Fuse Rating () Cat. Nos. Size Suitable for S-D-F type FN 2 SF , 63 4 SF , 63 6 SF , 63 SF , SF , SF *51 MM 32, SF , SF , SF , SF SF SF

Fuse Links Type HN (Fuse links with blade contacts) Conforms to IEC60269 / IS13703 Low watt loss - Saving in power Cooler running of associated products Low let through energy High breaking capacity

18 Fuse Links Type HN (Fuse links with blade contacts) Conforms to IEC60269 / IS13703 Low watt loss - Saving in power Cooler running of associated products Low let through energy High breaking capacity - k Immediate fault indication Rated voltage - V Size of the fuse link Size 000 Size 00 Size 0 Size 1 Size 2 Size 3 Rating () Cat. Nos. SF94940 SF94941 SF94942 SF94027 SF9402 SF94029 SF94030 SF94939 SF9412 SF94129 SF94130 SF94131 SF94132 SF94230 SF94231 SF94232 SF94233 SF94234 SF94332 SF94333 SF94334 SF94335 SF94434 SF94435 SF94436 SF94437 SF9493 Rated watt loss Watt loss limits as per IS mp, Fuse-7.5 W mp, Fuse-7.5 W 160 mp, Fuse-16 W 250 mp, Fuse-23 W mp, Fuse-34 W 630 mp, Fuse-4 W Suitable for S-D-Funits type FN or equivalent, 125, 160, 125, 160, 125, 160, 125, 160, 125, 160, 125, , 160 Fuse-pulling handle should be used for safe and easy removal of fuse links (for HF : SK9115 & for HN : SF90126) , , , , , , , , ,

Fuse Links Type HG and HQ (Fuse-links for bolted connections) Conforms to IEC60269 / IS13703 Low watt loss Low let through energy High breaking capacity - 0 k Rated voltage - V Type HQ Size of the

19 Fuse Links Type HG and HQ (Fuse-links for bolted connections) Conforms to IEC60269 / IS13703 Low watt loss Low let through energy High breaking capacity - 0 k Rated voltage - V Type HQ Size of the fuse 1 1L B1 B2 B3 B4 C2 C3 Rating () Cat. Nos. ST30736 ST30737 ST3073 ST30739 ST30740 ST30741 ST30742 ST30743 ST34527 ST3452 ST34529 ST3527 ST352 ST30747 ST3074 ST30749 ST30750 ST30752 ST30753 ST30753 ST30759 ST30760 ST30761 ST30767 ST3076 ST30769 ST30774 ST30775 ST30776 ST30777 ST3077 ST30779 ST3071 ST3072 ST3072 ST3073 ST3074 ST3075 ST3076 ST3077 ST307 Suitable for S-D-F units type FN or equivalent 32, 63 32, 63 32, 63 32, 63 32, 63 32, 63 32, 63 32, , 125, 160, 125, 160, 125, 160, 125, 160, 125, 160, 125, , Power Loss Type HG Rating () Size Cat. Nos. Power Loss F1 F1 F1 F1 F1 F1 F1 F1 ST30725 ST30726 ST30727 ST3072 ST30729 ST30730 ST30731 ST

20 Ordering Information Switch-disconnector-fuse and Switch-disconnector Type FN Ordering Information: Orderig Suffix OOOO for all * Example: FN 32 Interior with handle * Ordering Information - SK9551OOOO Type Designation Description FN 32 (4 Pole) FN 63 (4 Pole) FN FN 125 FN 160 FN S-D-F Suitable for DIN Fuses Interior with handle TPN SK9551 SK95421 SK9556 SK95001 SK95713 SK9541 Interior in sheet steel enclosure SK95612 SK95613 SK95569 SK95005 SK95715 SK95511 Interior with handle TP ST3027 ST2794 SK9599 ST2795 S-D-F Suitable for BS Fuses Interior with handle TPN SK95653 SK95651 SK95570 SK95009 SK95714 SK955 Switch-Disconnector Interior with handle TPN SK95541 SK95540 SK95571 SK95405 SK95607 Type Designation Description S-D-F Suitable for DIN Fuses FN 250 FN 315 FN FN 630 FN 00 FN 0 Interior with handle TPN SK95642 SK95461 SK9541 SK95521 SK95679 Interior in sheet steel enclosure SK9561 SK95514 SK95515 SK95547 SK95705 Interior with handle TP ST31731 ST2797 ST279 ST2799 ST31732 S-D-F Suitable for BS Fuses Interior with handle TPN SK9562 SK95590 SK95591 SK95592 Switch-Disconnector Interior with handle TPN SK9560 SK95609 SK95610 SK95611 SK95551 SK

21 Electrical Standard Products (ESP) Branch Offices: REGISTERED OFFICE ND HED OFFICE L&T House, Ballard Estate P. O. Box 27 Mumbai 001 Tel: Fax: Website: ELECTRICL STNDRD PRODUCTS (ESP) 501, Sakar Complex I Opp. Gandhigram Rly. Station shram Road hmedabad Tel: Fax: esp-ahm@lntebg.com 3, Cubbon Road, Post Box 509 Bangalore Tel: , Fax: esp-blr@lntebg.com 131/1, Zone II Maharana Pratap Nagar Bhopal Tel: , Fax: esp-bho@lntebg.com Plot No. 559, nnapurna Complex Lewis Road Bhubaneswar Tel: , Fax: esp-bbi@lntebg.com SCO 32, Sector 26-D Madhya Marg, P. O. Box 14 Chandigarh Tel: to 7 Fax: esp-chd@lntebg.com 10, Club House Road Chennai Tel: / 4 / 5 Fax: esp-maa@lntebg.com 67, ppuswamy Road Post Bag 7156 Opp. Nirmala College Coimbatore Tel: / 1 / 5 Fax: esp-cbe@lntebg.com L&T House, Group MIG - 5 Padmanabhpur Durg Tel: / 14 / 2 / 29 Fax: /11, stronauts venue Bidhan Nagar Durgapur Tel: / 952 / 744 Fax: esp-dgp@lntebg.com Milanpur Road, Bamuni Maidan Guwahati Tel: Fax: esp-gau@lntebg.com II Floor, Vasantha Chambers , Fateh Maidan Road Hyderabad Tel: Fax: esp-hyd@lntebg.com D-24, Prithvi Raj Road, C-Scheme Jaipur Tel: / 19 Fax: esp-jai@lntebg.com kashdeep Plaza, 2nd Floor P. O. Golmuri Jamshedpur Jharkhand Tel: Fax: esp-jam@lntebg.com Skybright Bldg. M. G. Road Ravipuram Junction, Ernakulam Kochi Tel: / 427 Fax: esp-cok@lntebg.com 3-B, Shakespeare Sarani Kolkata Tel: / 3 / 4 Fax: esp-ccu@lntebg.com 2,Indira Nagar, Faizabad Road Uttar Pradesh, Lucknow Tel: / 5 / 6 Fax: esp-lko@lntebg.com Plot No. 51 4th Main Road K. K. Nagar Madurai Tel: , Fax: esp-mdu@lntebg.com EBG North Wing Office - 2 Powai Campus Mumbai 072 Tel: / 2737 / 1156 Fax: esp-bom@lntebg.com B, Farmland Ramdaspeth Behind Hotel Radhika Nagpur Tel: / 24 Fax: esp-ngp@lntebg.com 32, Shivaji Marg P. O. Box 6223 New Delhi Tel: / 1, Fax: esp-del@lntebg.com L&T House P. O. Box /1, Dhole Patil Road Pune Tel: , Fax: , esp-pnq@lntebg.com 3rd Floor Vishwakarma Chambers Majura Gate, Ring Road Surat Tel: Fax: esp-sur@lntebg.com Radhadaya Complex Old Padra Road Near Charotar Society Vadodara Tel: / 11 / 12 Fax: esp-bar@lntebg.com 4--16, Dwarakanagar Visakhapatnam Tel: Fax: esp-viz@lntebg.com Product improvement is a continuous process. For the latest information and special applications, please contact any of our offices listed here. Electrical Standard Products Larsen & Toubro Limited Powai Campus, Mumbai 072 Tel: Fax: ebg-esp@lntebg.com Website: SP INT 19090

39 R3

Switch-Disconnector-Fuse HRC Fuse-links Bolted Type

Switch-Disconnector-Fuse HRC Fuse-links Bolted Type HRC Fuse-links Bolted Type Larsen & Toubro Limited, India s largest manufacturer of low tension switchgear, offers new FN range of SDFs suitable for