The new-age

sustainable solution

AIR INSULATED SWITCHGEAR

Compact l Reliable l Safe
The development of L&T s Air Insulated Switchgear was driven by innovation and
technology. L&T s AIS conforms to the latest international standards and local regulations.
Optimum results are ensured with enhanced safety, greater reliability, operating cost
efficiencies, effective use of capital, and superior performance.

L&T Electrical and Automation is a part of the multi-billion dollar technology, engineering, construc-
tion, manufacturing and services conglomerate. The Company designs, manufactures and markets a
wide range of low voltage and medium voltage electrical systems, control and automation systems,
electrical products and metering and protection systems.

Our core strength in engineering and MV product development, bolstered by strong R&D with
TAMCO, enables us to deliver the most comprehensive, best-in-class electrical solutions to our diverse
customer base.
 Safety
VH - AIS

Reliability

Convenience

Empowering you with our expertise, support,

millions hours of experience acquired internationally.
 Safety

VH - AIS
Reliability

Convenience

VH - Air Insulated Switchgear

L&T s VH-AIS is the result of decades of experience in

offering environment-friendly vacuum technology for arc-
quenching in highly reliable and safe air insulation, with
minimal maintenance, compact space solutions and ease of
user management.

VH - AIS comprises metal-clad medium voltage switchgear

assemblies from 3.3 to 36kV. We offer the most compact
switchgear up to a fault level of 50kA, 3s for 12kV &
31.5kA, 3s for 36kV system.

VH - AIS is well designed to function satisfactorily even in

the most adverse environmental conditions, owing to its
robust construction and high performance.

Your indoor switching system is absolutely safe and

protected with VH - AIS, for wide applications ranging from
industries to infrastructure sectors. It adheres to the latest
IEC standards.

IEC62271-100
High Voltage Circuit Breakers (1 kV - 52 kV)

IEC62271-200
High Voltage Metal Enclosed Switchgear (1 kV - 52 kV)

IEC62271-102
High Voltage Disconnectors & Earthing Switches

IEC62271-106
High Voltage Contactors (for Controllers & Motor Starters)
 Safety

Honored protector
VH - AIS is a robust metal-clad switchgear, divided into four
distinct compartments (busbar, circuit breaker, cable and
low voltage equipment) segregated by earthed metal
panels, to assure your protection against electric shock.

Extreme independence of
environment
VH - AIS gives you protection against access to hazardous
parts and solid foreign bodies and is designed & engineered
to perform satisfactorily in harsh and corrosive environment
Ingress protection with dust and pollution.

IP4X

Touch protective
The earthed metallic, spring operated shutters ensure
protection against accidental contact even when the
breaker is isolated or withdrawn.

The independent operation and padlocking of the busbar &

cable shutters enhances safety during maintenance.
 Safety

Arc proof Integral safety

The successful verification of internal arc classification, IAC
A (F,L,R), for our switchgear ensures the highest possible
degree of protection to operating personnel and switchgear
vicinity.

How?

VH-AIS incorporates independent pressure relief flaps for

each compartment and completely separated gas duct.

In the unlikely event of an internal arc fault, the gases are

expelled at the top of the cubicle, as far from the operator as
possible, for improved safety.

Our type-tested VH - AIS also accomplishes the provisions of internal Arc fault
withstand stest as per IEC 62271-200 in all aspects.

Criterion VH-AIS

Correctly secured doors and covers do not open

No enclosure fragmentation during the test period

No holes in accessible sides up to a height of 2m during an arc

Indicators do not ignite due to hot gases caused by the arc

Earth connections remain intact for the safety of operator

 Safety

A world of Safety interlocks

VH - AIS comprises a set of complete electrical interlocking
in grouping with intelligent & strong mechanical interlocks
to prevent any accidental erroneous operation, resulting in a
safer environment for both plant and personnel.

For maximum safety, all operations are performed from

the front with the door closed, with highly reliable fool-
proof interlocks:

For rack-in of VCB or VCU, connection of the LV plug

is mandatory.

VCB or VCU can be racked-in and withdrawn only in OFF

condition.

VCB or VCU can be closed only in Test or Service

position.

Earth Switch Interlock

Earth switch can be closed only when VCB or VCU is in
Test position.

VCB or VCU can be racked in only when Earth switch is

in open condition.

Earthing Truck Interlock

The Bus / Cable circuit can be earthed with the earthing
truck only when there is no voltage on Bus / Cable.

Customized Rear Door Interlock

Rear compartment door opens only when the VCB or
VCU is in test position with earth switch closed.

The VH - AIS comes with a host of safety

interlocks. Additional interlocking can be
engineered to your requirements.
 Safety

Trusted busbar zone

Generous and optimum clearances for main busbars
and connectors warrant unmatched safety for you.

Supports and insulation materials are flame resistant, track

resistant and non-hygroscopic exhibiting outstanding
electrical properties.

Earthing Switch
Safeguarding of operating personnel is achieved by
providing make-proof earthing switch for cable, as well as
busbar compartments.

You have an option to select an integral earthing switch or a

separate earthing truck.
The switch is tested to make and carry the rated short-circuit
current for 3s.

Safety First
 Reliability

Unmatched structural integrity

Our cubicles are made of high-grade pickled & oiled mild
steel sheets, cut and folded on numerically controlled
machines, making the enclosure sturdy and reliable.

Surface protector
The 9-tank pre-treatment paint process along with powder
coating with robotic paint applicator ensures that your
cubicle has a long lasting, high-gloss finish and is optimally
protected against corrosion and weathering.

Infinite cycles
Our Vacuum Circuit Breakers require minimal maintenance
and have a design life of 20 years or 10,000 mechanical
operations.

For motor switching applications, you can rely on our

vacuum contactors with a capacity of up to 3 million
mechanical operations.
 Reliability

Dynamic driver
Our AIS systems are seismically qualified. They are enhanced
for rigidity and tested for stable operation in earthquake
prone areas up to Zone V as per latest codes & standards.

A Global validation
VH - AIS is completely type-test-verified at
reputed international third-party laboratories
to assure you best-in-class products.
CPRI ERDA KEMA CESI ASTA

Factory specialist
The performance of your assemblies is guaranteed by
carrying out the following checks as our routine factory
test plan:
Electrical tests
Visual Checks
Measurement Checks
Mechanical tests
Physical tests
 Convenience

Smart addition
Panel coupling at site is made simple and safe through easily
accessible bus bar connections and links.

More space. More capability.

The cable termination height is well above floor level, and
generous space is provided for terminating power cables.
This ensures a higher bending radius and reduces tension on
the terminals.

Stay connected
Our Vacuum Circuit Breakers and Contactor Units are truck-
mounted, the movement of which is interlocked with the
door to make it very convenient for your operators.

Ergonomic
VH-AIS comes with a single-handle for opening and closing
the breaker door, eliminating fasteners. This makes the
operation quick and easy.
 Convenience

Minimum Footprint.
Optimum Utilisation.
VH - AIS can accommodate 2 VCBs / VCUs in a single vertical
section, thereby saving space.

Also, Bus PT and Line PT can be offered in a two-tier

arrangement.

Maximize your space

VH - AIS is characterized by a reduced width which offers
savings on space and civil costs. Even with panels as slim as
600mm, it offers spacious compartments allowing easy
access for installation and maintenance.
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
mtrs

Visual appeal
The detailed instructions about operations & interlocks
are screen printed on the VCB compartment door for
convenience.

Moreover, the front viewing window shows a clear visual

display of circuit breaker position, ON/OFF condition, spring
charged / discharged and earthing switch status.

Customize your experience

Round-the-clock project management executives and after-
sales teams support your installation, commissioning and
maintenance needs.
 Construction

Typical VH - AIS Arrangement

A - VCB / VCU Compartment
B - Busbar Compartment
C - Cable Compartment
D - Low Voltage Compartment

19

D
13

A B C
9

12
1

16
2

3
4 20
5

6 17

18
7

10 15 11 14

FRONT VIEW SECTIONAL VIEW

01 - Test / Service position Indicator 08 - Routing communication wires 15 - Earth switch

02 - VCB door handle & padlocking 09 - Routing Interpanel wires 16 - Rear Door Interlock
Customised

03 - Manual trip 10 - Control cable entry 17 - Surge Arrester

04 - Manual close 11 - Earth bar 18 - CBCT

05 - Viewing window for VCB ON/OFF 12 - VCB safety shutters 19 - Gas Duct
& Spring charging status indication
13 - Pressure relief flaps 20 - Voltage Detecting
06 - VCB Racking slot Insulator
14 - Power cable entry
07 - Earth switch operating slot
 Construction

Typical configurations
- Busbar - Line PT

- Gas Duct - VCB / VCU

- Metering - Cable

- Bus PT

Incomer / outgoing Incomer / outgoing Buscoupler with Bus PT

with bottom cable entry with top duct entry and Riser panel

Two tier PT Panel Two tier VCU Panel Incomer

with Line PT
IEC 62271

Technical Specifications

7.2 kV AIS with VCU

Standards IEC 62271-200

Panel Details
Type Designation VH1H
Voltage up to 7.2 kV*
Power Frequency Withstand Voltage 20 kVrms
Voltage ratings
Impulse Withstand Voltage 60 kVp
Frequency 50 / 60 Hz
Rated Current 200 - 400 A
Current ratings Short Time Withstand Current up to 8 kA

Short Time Withstand Current (with Fuse) 25 / 40 / 50 kA

Width# 600 mm
Dimension Depth# 1570 / 1970 mm
Height# 2495 mm
Partition Class PM
Loss of Service continuity LSC-2B
Construction Degree of protection IP4X (Higher IP on request)

Type C
A (F, L,R), 40kA, up to 1s
IEC Standard IEC 62271-106
VCU Type Non Latched Latched
Type Designation VCU7N200 VCU7N400 VCU7L200 VCU7L400
Opening time < 35 ms
VCU Mechanical Endurance up to 3 Million up to 0.3 Million
Electrical Endurance up to 0.3 Million (AC-3)

Rated Duties (40% on Load Factor) Class 300

110 / 220 V DC

Auxiliary Contacts 3NO+3NC

* 12 kV VCU offered on request

 IEC 62271

Technical Specifications

12 kV AIS with VCB

Standards IEC 62271-200

Panel Details
Type Designation VH1H
Voltage up to12 kV
Power Frequency Withstand Voltage 28 /38* kVrms
Voltage ratings
Impulse Withstand Voltage 75 / 95* kVp
Frequency 50 / 60 Hz
Rated Current 630 / 800 A 1250 A 2000 A 3150 / 4000^ A

25 / 26.3 kA
Short Time Withstand Current (3s)
Current ratings 40 / 50 kA
62.5 / 65.75 kAp
Short Circuit Making current
100 / 125 kAp
Width# 600 mm 800 mm 1000 mm
Dimension Depth # 1570 / 1970 / 2170 / 2270 mm
Height 2495 mm
Partition Class PM
Loss of Service continuity LSC-2B
Construction
Degree of protection IP4X (Higher IP on request)
Internal Arc Classification A (F, L,R), up to 40 / 50kA , up to 1s
IEC Standard IEC 62271-100
Type Designation VK series
Operating Sequence O-0.3sec-CO-3min-CO
Opening time < 35 ms
VCB Break time < 3 cycles
Mechanical Operations 10,000
Closing /Tripping Coil 24 / 48 / 110 / 220 V DC

Spring charging motor 24 / 48 / 110 / 220 V DC l 110 / 240 V AC

Auxiliary Contacts 6NO+6NC / 12NO+12NC*

* offered on request ^ with forced ventilation # 50kA Panel width & depth starts from 800mm & 1970mm respectively
IEC 62271

Technical Specifications

36 kV AIS with VCB

Standards IEC 62271-200

Panel Details
Type Designation VH3
Voltage 36 kV
Power Frequency Withstand Voltage 70 kVrms
Voltage ratings
Impulse Withstand Voltage 170 kVp
Frequency 50 / 60 Hz
Rated Current 800 A 1250 A 2000 / 2500* A
Current ratings Short Time Withstand Current (3s) 25 / 31.5 kA
Short Circuit Making current 63 / 79 kAp
Width 1000 mm
Dimension Depth** 2650 / 2950 mm
Height*** 2500 mm
Partition Class PM
Loss of Service continuity LSC-2B
Construction Degree of protection IP4X (Higher IP on request)
Internal Arc Classification A (F, L,R), 31.5kA , 1s
IEC Standard IEC 62271-100
Type Designation VY series
Operating Sequence O-0.3sec-CO-3min-CO
Opening time < 35 ms
VCB Break time < 3 cycles
Mechanical Operations 10,000
Closing /Tripping Coil 24 / 48 / 110 / 220 V DC
Spring charging motor 24 / 48 / 110 / 220 V DC l 110 / 240 V AC
Auxiliary Contacts 6NO+6NC
* Offered on request.
** Depth may vary with cable size & number of Current Transformer.
*** Height is without gas duct and may change (increase/decrease) depending on LV Components / Relays.
The Perfect Match for your VH - AIS

L&T's VH - AIS offers the widest range of electrical solutions up to 36kV. Our In-house design and testing facilities
enable us to create customized solutions with type tested switchboard combining VCBs and VCUs in perfectly matched
configuration as per your requirements. We ensure that you achieve the highest level of cost & design optimisation with
our VH - AIS.

Vacuum Circuit Breaker

VCB Class - E2 | C2 | M2

Customized 2 trip coils configuration

Common design & safety interlocks up to 36kV

Rated current capacity up to 4000A

Short circuit breaking capacity up to 50kA

Built - in anti-pumping feature

User-friendly truck mounted design

Single operating handle for VCB door

Vacuum Contactor Unit

Fused Short circuit protection up to 50kA

Available in latched & non latched configurations

Encapsulated current carrying parts for higher safety

Truck mounted design similar to VCBs

Suitable for motor starters with numerous switching

operations

Two VCUs can be accommodated in single panel for

optimum space utilisation

VCU panels can be coupled with VCB panels owing to

similar dimensions
Sales Ofces - India Sales Ofces - International
Bengaluru Australia Oman
TAMCO Electrical Industries Australia Pty P.O.Box 598, Ruwi, Postal Code-112
Bengaluru 560001 Ltd Sultanate of Oman
Tel: 080-25020319 31 Kitchen Road, Dandenong 3175 Tel:+968 98034317
Fax: 080-25596397 Melbourne, Victoria, Australia Mob:+968 98034317
Email: ese-chn@Lntebg.com Tel:+613 9706 7288 EMail: ese-oman@Lntebg.com
Fax:+613 9706 9112
Chennai Email: sales@tamcoaustralia.com.au Qatar
L&T Construction Campus www.tamcoaustralia.com.au
TC-1 Building, II Floor
Mount-Poonamallee Road India Najma Intersection, Opp: Doha Cinema
Manapakkam, Chennai 600 089 L&T Gate NO. 5, L&T Business Park TC -II, C-Ring Road,P.O Box No- 24399
Tel:+91-44-2270 6801 Tower B - 7 th oor, Saki vihar road, Doha, Qatar
Fax:+91-44-2270 6930 Mumbai 400 072 Tel: +974-44-239 000
Email: ese-chn@Lntebg.com Tel:+91-22-6705 2813 Fax: +974-44-551 286
Fax:+91-22-6705 1024 Email: ese-qatar@Lntebg.com
Hyderabad Email: ese-intl@Lntebg.com
Post Bag 12, Vasantha Chambers Saudi Arabia
Indonesia L&T Electricals Saudi Arabia Company
Hyderabad 500 004 PT. TAMCO Indonesia Limited - L. L. C
Tel: +91-40-6672 0210 F-36, Jalan Jababeka Raya MH-4, Plot: 17+19
Fax: +91-40-2324 2356 Jababeka Industrial Estate
Email: ese-hyd@Lntebg.com Cikarang Utara, Bekasi, 17530,Indonesia Kingdom of Saudi Arabia
Tel.: +62 21 893 5070 Tel: +966-3-8127708
Kolkata
Fax: +62 21 893 5071 Fax: +966-3-8127780
Post Bag 619
Email: sales@tamco.co.id Email: Ltesa@Lntebg.com
www.tamco.co.id
Kolkata 700 071
Tel. : +91-33-4400 2550 / 2558 Kuwait 2203, 22nd Floor
Fax. : +91-33-22827587 / 1025 Kana Controls General Trading &
Email: ese-kol@Lntebg.com Contracting Co. W.L.L
P.O Box: 25593 Safat, 13116 Abu Dhabi, UAE
Mumbai
Kuwait Tel. : +971-2-676 5988
L&T Gate NO. 5, L&T Business Park TC -II,
Tel: +965-2474 1373 Fax. : +971-2-676 6399
Tower B - 7 th oor, Saki vihar road,
Faxs: +965-2474 1537 Email: ese-uae@Lntebg.com
Mumbai 400 072
Email: ese-kwt@Lntebg.com
Tel:+91-22-6705 3083
Fax:+91-22-6705 1556 Malaysia
Email: ese-intl@Lntebg.com TAMCO SWITCHGEAR (MALAYSIA) SDN
BHD
New Delhi
Sub Lot 24, Lot 16505, Jalan Keluli 1
Post Bag 6223
32, Shivaji Marg
Section 7
New Delhi 110 015
Tel: +91-11-4141 9620/9942
Tel: +603 3361 8200
Fax: +91-11-4141 9625
Fax: +603 3341 6200
Email: ese-del@Lntebg.com
Email: tamco@tamco.com.my
www.tamco.com.my
Radhadaya Complex, J. P. Road
Vadodara 390 015
Tel: +91-265-66136 37/38
Fax: +91-265-2336 184
Email: ese-vad@Lntebg.com
ACA19.11.2015

Larsen & Toubro Limited, Electrical Systems & Equipment - Head Of ce Registered Of ce:
7C, TC II, Tower B, Level 7, L&T Gate No. 5, Saki Vihar Road, Powai, Mumbai 400 072. L&T House, N. M. Marg
Tel: +91-22-6705 1748 Fax: +91-22-6705 1556 Ballard Estate
Mumbai 400 001, INDIA
Email: ese-cmt@Lntebg.com Website: www.lntebg.com
The information contained herein is correct at time of printing, but as the products and its manufacturing processes are being developed continuously,
this information is subject to change without notice and the company cannot be held liable for any alleged misinterpretation howsoever arising.