Pressfit SFT1 User manual

®
CIRCUIT BREAKERS
TM
Circuit Breakers
SG-01 v8
9th November 2022
THE ORANGE LINE
OF SAFETY!

CIRCUIT BREAKERS
TM
Protect What’s Valuable
As is the norm for many decades, electricity forms the core of our existence. In one form or the other,
electrical systems have touched every aspect of our lives and connue to grow faster than ever before.
With the advent of Internet of Things (IoT), the load on electrical systems and the cricality increases
even more! With heavier loads, come greater safety requirements. Pressfit’s range of SFT1 Circuit
Breakers are designed to protect humans as well as appliances from the dangerous side of electricity.
Placing safety above all, SFT1 MCBs, RCCBs, Isolators, and Changeover Switches are engineered to
deliver quicker fail-overs and safer protecon standards.
®

MCB
Overloading and fluctuaon in electric supply can be dangerous to humans as well as appliances.
To migate these risks, installaon of miniature circuit breakers or MCBs is necessary.
Designed, engineered, and made in India, Pressfit’s SFT1 MCBs deliver opmum security
to your premises 24x7! In the event of an overload or a short-circuit, SFT1 MCBs safely cut
the connected circuit almost instantaneously. Precious lives and equipment are protected not
just from electrical damage, but also from fires that are mostly caused by short circuits.
Equipped with a High-Speed and High Breaking Capacity Mechanism, and a high short circuit
breaking capacity of 10000A (10kA), SFT1 circuit breakers adhere to the IS/IEC 60898-1 norms
and are the perfect fit for your heavy electrical appliances.
Miniature Circuit Breakers (MCB)
Virgin, Fire-Retardant Nylon Body
PA
Safety First
Technical Specifications
IS/IEC 60898-1-2008, DIN 43-880
6A to 63A
10000A (10kA)
7500A (7.5kA)
Class 3
660 V AC
4kV
50Hz
2000V for 1 minute
IP20
Thermal and Magnetic Type
o o
10 C to 60 C, RH <85%, <2000 m Altitude
20000 operations
20000 operations (I < 32A)
n
10000 operations (I > 32A)
n
Red – On, Green - Off
35 sq. mm
Much less than IS/IEC Standards
On DIN Rail (35 mm x 7.5 mm)
SP, TP+N
240/415 V AC
SP+N
240 V AC
DP, TP, FP
415 V AC
C Curve
(5-10) In
C Curve
SP, SP+N, DP,
TP, TP+N, FP
B Curve
(3-5) In
B Curve
SP
Standard Conformity
Standard Rated Current (I )
n
Rated Short Circuit Capacity (I )
cn
Service Short Circuit Capacity (I )
cs
Energy Liming Class
Magnec Release Seng
Poles
Rated Operaonal Voltage (Ue)
Rated Insulation Voltage (Ui)
Rated Impulse Voltage (Uimp)
Rated Frequency (f)
Dielectric Strength
Protection Class
Tripping Mechanism
Normal Operating Conditions
Endurance (Mechanical)
Endurance (Electrical)
Contact Indication
Terminal Capacity
Power Loss
Mounting

Technical Specifications
Reference Standard
Poles
Current Rang (I )
n
Rated Voltage (U )
e
Rated Residual Operang Current (I )
Δn
Protecon
Operang Device
Rated Frequency (f)
Rated Impulse Voltage
Short Circuit Withstanding Capacity
Rated Insulaon Voltage (U)
i
Rated Condional Short Circuit Current (I )
nc
Rated Making and Breaking Capacity (I )
m
Operang Characterisc
Dielectric Strength
Trip Time
Normal Operang Condions
Terminal Capacity
Vibraon
Protecon Class
Contact Posion Indicaon
Installaon Posion
Mounng
IS 12640-1:2000, IEC 61008, DIN 43-880
DP & FP
25A, 40A & 63A
DP: 240 V AC, FP: 240/415 V AC
30mA, 100mA & 300mA
Against Earth Fault / Leakage Current
Current Operang Device
50 Hz
4 kV
DP: 10 kA, FP: 6 kA
440 V
DP: 10 kA, FP: 6 kA
500A or 10In whichever is greater
AC Type
2 kV 1min.
Instantaneous <40ms, Selecve > 150ms
o o
10 C to 60 C, RH <85%, <2000 m Altude
35 sq. mm Copper
3g
IP20
Yes
Vercal / Horizontal
Clip on DIN rail (35 mm * 7.5 mm)
Pressfit’s SFT1 Residual current circuit breakers (RCCB) protect people from the risks
of electrocuon and fires caused due to faulty wiring, poorly insulated equipment, sudden
earth faults, or incorrect use of an electrical device. These mistakes cause current to flow in
reverse to the earth, which is called an 'Earth Leakage Current', and it is an electrical hazard.
The RCCB immediately trips when an imbalance in electric current is detected, protecng us from
direct and/or indirect contacts. Pressfit’s SFT1 RCCB adhere to the IS/IEC 12640-1 norms
and one of the greatest advantages is that it takes only about 20 milliseconds to trip and
take the control over the imbalanced electric current.
Residual Current Circuit Breakers (RCCB)
Virgin, Fire-Retardant Nylon Body
PA
RCCB
®

ISOLATOR
Isolator
An isolator switch isolates or disconnects the circuit from the mains and gets rid of the trapped charges of the
circuit. This is necessary to carry out repairs and maintenance in the electrical setup. An isolator ensures that there
will be no current at the load side even if an impulse voltage appears when the isolator is switched off. Isolators are
generally used at the end of the breaker to repair or to replace. Pressfit’s SFT1 Isolators are perfect companions for
ensuring the complete de-energisaon of the electrical circuits of residences and/or commercial premises. They
can be safely used as incomers and are made in reference to the IS/IEC 60947-3 norms. These are equipped with
Silver alloy contacts for weld-free operaons and form the perfect fitments as incomers for individual residences.
Virgin, Fire-Retardant Nylon Body
PA
Technical Specifications
Reference Standard
Poles
Current Rang (I )
n
Rated Voltage (U )
e
Rated Frequency (f)
Ulizaon Category
Rated Insulaon Voltage (U)
i
Rated Impulse Voltage (U )
imp
Operang Temperature
Dielectric Strength
Relave Humidity
Vibraon
Protecon Class
Contact Posion Indicaon
Terminaon
Terminal Capacity
Design
Mounng
Installaon Posion
Case and cover Material
IS/IEC 60947-3
DP, TP & FP
40A, 63A, 100A, and 125A
240/415V AC
50 Hz
AC 22A
660 V
6 kV
-5 to 50 C
2000V 1 min.
95%
3 g
IP20
Yes
Bi-connect (bus bar/cable) ≤ 63A
Cable ≥ 63A
40A/63A: 4 sq. mm to 35 sq. mm for Cu conductors
100A: 10 sq. mm to 50 sq. mm for Cu conductors
Double-break contact design
Clip on DIN rail (35 mm * 7.5 mm)
Vercal/Horizontal
Moulded, Flame Retardant Plasc
Safety First

CHANGEOVER
MCB Changeover Switch
Pressfit’s SFT1 MCB Changeover Switch (COS) enables us to switch the load between two power supplies. In most
cases, the COS is used to switch to a backup line when the main line needs to be taken offline for repair and
maintenance. It is widely used in industries and in domesc locaons where connuity of supply is necessary. It
finds a lot of use in individual bungalows due to the same reason.
Changeover switches, in principle, disconnect switches independently based on manual operaon, and can make,
carry, and break currents under normal circuit condions. The COS has 3 posions – I-O-II with the center line
being the off. The SFT1 COS comes in 2 types - DP and FP – for single and three phase applicaons respecvely.
Technical Specifications
Reference Standard
Poles
Current Rang (I )
n
Rated Voltage (U )
e
Rated Frequency (f)
Ulizaon Category
Rated Insulaon Voltage (U)
i
Rated Impulse Voltage (U )
imp
Operang Temperature
Dielectric Strength
Relave Humidity
Protecon Class
Contact Posion Indicaon
Mounng
IS/IEC 60947-3
DP, FP
25A, 40A, 63A
240/415V AC
50 Hz
AC 22A
660V AC
4 kV
-5 to 50 C
2500V 1 min.
95%
IP20
Yes
Clip on DIN rail (35 mm * 7.5 mm)
Installation:
1. Switch off the MCB and disconnect the power supply.
2. Mount the COS over DIN rail with snap at boom.
3. Check the operaon and the knob posions before connecng the cables.
4. When the knob posion is I:
a. Top indicator is RED, Boom indicator is GREEN b. Load is connected through power supply I
5. When the knob posion is II:
a. Top indicator is GREEN, Boom indicator is RED b. Load is connected through power supply II
6. When the knob is at the MID posion, both indicators show GREEN & it is a No-Load / Off posion.
7. Connect the cables at the incoming and outgoing terminals
8. Select power supply (I or II) for the load.
9. Switch the MCB on.
Virgin, Fire-Retardant Nylon Body
PA
®

MINI MCB
Mini MCB
Pressfit’s SFT1 Mini MCBs are designed to protect household appliances from electrical overloads and short
circuits. As their name suggests, mini MCBs are very compact – fing in the safety features of the tradional MCB
in the form factor of everyday switches and sockets.
Our Mini MCBs are available in both modular – compable with our One and Edge range of modular plates – as well
as non-modular form – to be affixed on switchboards with screws. Mini MCBs provide per-point protecon to your
devices while being economical – as it can save you the expense of a Surface DP Switch or separate board.
Features:
- Protects against overload and short-circuit
- Low Power Loss in operaon
- Variants available for modular plates as well as non-modular boards
- Can be used for per-point protecon
- Compact and Aesthec Design with latest technology
- Long electrical and mechanical life
Applications:
- DOMESTIC: Air Condioners, Refrigerators, Geysers, Washing Machines, Home Theaters, Domesc Pump sets,
Microwave Ovens, Grillers, Single Phase Motors, etc
- COMMERCIAL: AC, Hot Plate, Xerox machines, Diffusers
- HOSPITALITY: AC, Heaters, Coolers, Heavy-Duty Mixers, Cooking Equipment
- HEALTHCARE: Low-Wa X-Ray Machines, Laboratory Equipment in Individual Clinics
Technical Specifications:
Standard Conformity: IS/IEC 60898-1 (2008)
Rated Short-Circuit Capacity (I ): 3000A (3kA)
cn
Service Short-Circuit Capacity (I ): 1500A (1.5kA)
cs
Energy-Liming Class: Class 3
Magnec Release Seng: C Curve
Rated Operaonal Voltage: SP – 240/415V AC, DP – 415V AC
Safety First

FUSES
Porcelain Kit-Kat Fuses
Pressfit’s Porcelain Kit-Kat Fuses are designed for reliable and robust operaon. To protect valuable
appliances against power surges and overloads, our fuses are made using the finest an-degradant,
high-glaze porcelain, and top-notch brass connectors. The fuses are rewireable, are easy-to-install and
are meant for domesc wiring and small-scale usage.
The way these fuses work is very different from MCBs. The metal fuse wire is the crical component for
the product. If too much current passes through it, the wire melts and breaks the circuit.
There are two parts in kit kat fuse – fuse carrier (top) and fuse base (boom). The metal contacts are
fixed in the base and incoming/outgoing wires are aached to these contacts. The circuit is completed
when the top is inserted into the base, connecng the load-side circuit to the source-side circuit. The
main advantage of this type of fuse is that it can be easily disconnected from the circuit without any risk
of coming in contact with the live wire.
An
Degradant
Easy to
Install
Alternative to MCBs
MCBs have many advantages over porcelain fuses but sll, fuses serve as a beer alternave for many purposes. They
generally have a lesser operang me and are more cost-effecve than MCBs. They also offer more flexibility as they can be
changed to operate at a different load capacity temporarily. This can be done by changing the thickness of the fuse wire used.
High-Glaze
Porcelain
Reliable
Brass Connectors
Rewireable
®

810105
810107
810109
810110
810111
810112
810113
810114
810115
150.00
150.00
150.00
150.00
150.00
150.00
200.00
205.00
205.00
6A SP
10A SP
16A SP
20A SP
25A SP
32A SP
40A SP
50A SP
63A SP
12
12
12
12
12
12
12
12
12
SP
MCB
330.00
330.00
330.00
330.00
330.00
330.00
490.00
500.00
500.00
6A SPN
10A SPN
16A SPN
20A SPN
25A SPN
32A SPN
40A SPN
50A SPN
63A SPN
810505
810507
810509
810510
810511
810512
810513
810514
810515
6
6
6
6
6
6
6
6
6
SPN
MCB
C-Type
C-Type
C-Type
C-Type
6A TP
10A TP
16A TP
20A TP
25A TP
32A TP
40A TP
50A TP
63A TP
810305
810307
810309
810310
810311
810312
810313
810314
810315
6A DP
10A DP
16A DP
20A DP
25A DP
32A DP
40A DP
50A DP
63A DP
810205
810207
810209
810210
810211
810212
810213
810214
810215
330.00
330.00
330.00
330.00
330.00
330.00
490.00
500.00
500.00
540.00
540.00
540.00
540.00
540.00
540.00
790.00
800.00
800.00
6
6
6
6
6
6
6
6
6
DP
MCB
TP
MCB
4
4
4
4
4
4
4
4
4
Descripon
Code LP (₹)
PKG. (N)
Descripon
LP (₹)
PKG. (N)
Code
Descripon
Code LP (₹)
PKG. (N)
Code Description LP (₹) PKG. (N)
Safety First

6A FP
10A FP
16A FP
20A FP
25A FP
32A FP
40A FP
50A FP
63A FP
810405
810407
810409
810410
810411
810412
810413
810414
810415
3
3
3
3
3
3
3
3
3
780.00
780.00
780.00
780.00
780.00
780.00
985.00
995.00
995.00
6
6
6
6
6
6
6
6
FP
MCB
DP
RCCB
FP
RCCB
C-Type
25A DP (30 mA)
40A DP (30 mA)
63A DP (30 mA)
25A DP (100 mA)
40A DP (100 mA)
63A DP (100 mA)
40A DP (300 mA)
63A DP (300 mA)
1600.00
1600.00
2100.00
1600.00
1600.00
2100.00
1600.00
2100.00
813401
813421
813441
813402
813422
813442
813423
813443
3
3
3
3
3
3
3
3
25A FP (30 mA)
40A FP (30 mA)
63A FP (30 mA)
25A FP (100 mA)
40A FP (100 mA)
63A FP (100 mA)
40A FP (300 mA)
63A FP (300 mA)
2000.00
2000.00
2600.00
2000.00
2000.00
2600.00
2000.00
2600.00
TPN
MCB
6A TPN
10A TPN
16A TPN
20A TPN
25A TPN
32A TPN
40A TPN
50A TPN
63A TPN
810605
810607
810609
810610
810611
810612
810613
810614
810615
780.00
780.00
780.00
780.00
780.00
780.00
985.00
995.00
995.00
3
3
3
3
3
3
3
3
3
C-Type
813201
813221
813241
813202
813222
813242
813223
813243
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
®

DP
ISO
TP
ISO
FP
ISO
6
6
6
812213
812215
812217
40A DP ISO
63A DP ISO
100A DP ISO
320.00
400.00
560.00
812313
812315
812317
40A TP ISO
63A TP ISO
100A TP ISO
565.00
670.00
840.00
4
4
4
812413
812415
812417
40A FP ISO
63A FP ISO
100A FP ISO
700.00
800.00
1000.00
3
3
3
Descripon
Code LP (₹)
PKG. (N)
Descripon
Code LP (₹)
PKG. (N)
Descripon
Code LP (₹)
PKG. (N)
Safety First

814411
814413
814415
25A FP COS
40A FP COS
63A FP COS
1020.00
1500.00
1800.00
3
3
3
FP
COS
6
6
6
814211
814213
814215
25A DP COS
40A DP COS
63A DP COS
540.00
725.00
1000.00
DP
COS
Descripon
Code LP (₹)
PKG. (N)
Descripon
Code LP (₹)
PKG. (N)
®

SP
MINI
MCB
10
10
10
10
10
10
806105
806107
806109
806110
806111
806112
6A SP MINI
10A SP MINI
16A SP MINI
20A SP MINI
25A SP MINI
32A SP MINI
165.00
165.00
165.00
165.00
165.00
165.00
DP
MINI
MCB
10
10
10
10
806209
806210
806211
806212
16A DP MINI
20A DP MINI
25A DP MINI
32A DP MINI
330.00
330.00
330.00
330.00
Non-Modular Mini MCB
Compable With
16A 240V
16A 415V
32A 415V
63A 415V
100A 415V
200A 415V
598100
598110
598120
598130
598140
598150
77.00
131.00
240.00
600.00
1060.00
1780.00
10
10
5
1
1
1
Porcelain Kit-Kat Fuses
KIT
KAT
FUSES
Descripon
Code LP (₹)
PKG. (N)
Descripon
Code LP (₹)
PKG. (N)
Descripon
Code LP (₹)
PKG. (N)
Safety First

Distribution
Boards
®

DIYA
DB
801212
801222
801232
801252
801262
4 Way
6 Way
8 Way
12 Way
16 Way
477.00
540.00
688.00
1058.00
1323.00
1
1
1
1
1
DIYA
PLUS
DB
(METAL BACK)
801310
801320
801330
801350
801360
4 Way
6 Way
8 Way
12 Way
16 Way
683.00
765.00
983.00
1475.00
1803.00
1
1
1
1
1
SAFARI
SPN
DB
GOLD
SPN
DB
801012
801022
801032
801042
801052
801062
4 Way
6 Way
8 Way
10 Way
12 Way
16 Way
1019.00
1187.00
1385.00
1558.00
1681.00
2176.00
1
1
1
1
1
1
801312
801322
801332
801342
801352
801362
4 Way
6 Way
8 Way
10 Way
12 Way
16 Way
730.00
850.00
944.00
1049.00
1153.00
1359.00
1
1
1
1
1
1
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
Descripon
Code LP (₹)
PKG. (N)
Safety First

GOLD
TPN
DB
4 Way
6 Way
8 Way
12 Way
2827.00
3410.00
4015.00
5500.00
1
1
1
1
971010
971020
971030
16A R-F Switch
25A R-F Switch
32A R-F Switch
500.00
675.00
750.00
1
1
1
Reverse-Forward Switches
R-F
SWITCH
PHASE
SEL.
SWITCH
972120
972130
972140
972150
IP 3 Way 25A
IP 3 Way 32A
IP 3 Way 40A
IP 3 Way 63A
275.00
275.00
475.00
475.00
10
10
5
5
972220
972230
972240
972250
IP 4 Way 25A
IP 4 Way 32A
IP 4 Way 40A
IP 4 Way 63A
325.00
325.00
540.00
540.00
10
10
5
5
801412
801422
801432
801452
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
®

GOLD
ME
(w/o N-LINK &
BUS BAR)
MCB Metal Enclosures
802013
802023
802033
802043
802053
802063
802073
802083
802093
1 Way
2 Way
3 Way
4 Way
6 Way
8 Way
10 Way
12 Way
16 Way
240.00
240.00
347.00
347.00
385.00
440.00
440.00
715.00
1000.00
1
1
1
1
1
1
1
1
1
TONI
ME
(w/o N-LINK &
BUS BAR)
802320
802340
2 Way
4 Way
270.00
350.00
1
1
Descripon Code LP (₹)
PKG. (N)
NICO
ME
(w/o N-LINK &
BUS BAR)
802120
802140
2 Way
4 Way
270.00
350.00
1
1
Descripon Code LP (₹)
PKG. (N)
Descripon Code LP (₹)
PKG. (N)
Safety First
ROBIN
ME
(w/o N-LINK &
BUS BAR)
802220
802240
2 Way
4 Way
290.00
380.00
1
1
Descripon Code LP (₹)
PKG. (N)

MCB
MCB Tripping Mechanism
The tripping mechanism of Pressfit MCBs is Thermal-Magnetic Type. Fast mechanism design enables fastest
tripping of the Pressfit MCB.
Thermal Operation (Overload Protection): The thermal operation protects the circuit from moderate
overloads. Under overload condition, a thermo-metallic element (bimetallic strip) deflects until it operates a
latching mechanism allowing the main contacts to open. The overload protection works only up to the level where
magnetic tripping starts.
Magnetic Operation (Short-Circuit Protection): In magnetic operation, large overloads or short circuit
current actuates a solenoid causing a plunger to strike the latching mechanism, rapidly opening the main contacts.
Tripping Characteristics: Based on the tripping characteristics, Pressfit MCBs are available in B, C, and D Curves to suit different types
of applications. (There is no Type A instantaneous tripping characteristic to avoid confusion with the A abbreviation for amperes.)
B Curve: For protection of electrical circuits with equipment that do not cause surge currents (for lighting and distribution circuits). Short
circuit release is set to 3-5 times the rated current (In).
C Curve: For protection of electrical circuits with equipment that cause surge current (inductive loads and motor circuits). Short circuit
release is set to 5-10 times the rated current (In).
D Curve: For protection of electrical circuits with equipment which cause high inrush current, typically 12-15 times the thermal rated
current (transformers, large winding motors, X-ray machines, etc). Short circuit release is set to 10-20 times the rated current (In).
1UPPER TERMINAL
MAGNETIC COIL
(MAGNETIC TRIPPING)
KNOB
OPERATING MECHANISM
MOVING CONTACT
BI-METAL
(THERMAL TRIPPING)
FIXED CONTACT
ARC CHUTE
THERMOPLASTIC BASE
LOWER TERMINAL
Operating Principle and Specifications
®
17
Wire Size
1.0 sq. mm
1.5 sq. mm
2.5 sq. mm
4.0 sq. mm
6.0 sq. mm
Rated Current (In)
< = 6A
6 - 13A
13 - 20A
20 - 25A
25 - 32A
Selection of Wire/Cable for MCBs, Isolators, and RCCBs
Wire Size
10 sq. mm
16 sq. mm
25 sq. mm
35 sq. mm
50 sq. mm
Rated Current (In)
32 - 50A
50 - 63A
63 - 80A
80 - 100A
100 - 125A

Leakage Current and Risks Involved:
The flow of current while using an electrical device always involves risk. Poorly insulated apparatus, faulty wires
or improper usage of the device may cause the current to flow through the wrong path. This is called Leakage
Current. There are two major risks involved with Leakage Current: Fire Hazards and Electrocution.
Sensitivity Application Selection Criterion of RCCB
Applicaon
Human Protecon / Domesc Installaon
Limited Human Protecon / Machine Protecon
Building / Fire
RCCB Rating (mA)
30mA
100mA
300mA
Important Note: Under the Indian Electricity Rules [rules 61 (A), 71 (1) and 73 (1)], installation of an RCCB is
mandatory in all installations of 5 KW and above, in all luminous tube signs and X-ray installations. The Bureau of
Indian Standards also recommends that RCCBs installed at construction sites, temporary installations, agriculture,
and horticulture premises, limiting the residual current to 30 mA.
Fault Finding when RCCB Trips
Identifying earth leakage fault with RCCBs is very simple. First, switch off all the Switches/MCBs, switch the RCCB ON and then switch on
the remaining switches one after the other. When you find the RCCB trips repeatedly on switching one circuit on, you have found the faulty
circuit. This is the quickest way to identify a faulty circuit/appliance. You can then isolate that faulty circuit, rectify the fault and switch ON
the RCCB.
Voltage Independent
RCCB is not voltage dependent and it’s a purely current-operated circuit breaker. It does not trip if voltage drops, thus providing protection
against leakage current at reduced voltage too.
S (sq. mm)
1.0
1.5
2.5
4.0
6.0
Values Of The Rated Current (In) A (Amp.)
In ≤ 6
6 < In ≤ 13
13 < In ≤ 20
20 < In ≤ 25
25 < In ≤ 32
S (sq. mm)
10
16
25
35
50
Values Of The Rated Current In (Amp.)
32 < In ≤ 50
50 < In ≤ 63
63 < In ≤ 80
80 < In ≤ 100
100 < In ≤ 125
Selection of Wire/Cable for MCBs, Isolators, and RCCBs
Safety First
RCCB
18
Operating Principle and Specifications
Wire Size
1.0 sq. mm
1.5 sq. mm
2.5 sq. mm
4.0 sq. mm
6.0 sq. mm
Rated Current (In)
< = 6A
6 - 13A
13 - 20A
20 - 25A
25 - 32A
Selection of Wire/Cable for MCBs, Isolators, and RCCBs
Wire Size
10 sq. mm
16 sq. mm
25 sq. mm
35 sq. mm
50 sq. mm
Rated Current (In)
32 - 50A
50 - 63A
63 - 80A
80 - 100A
100 - 125A

®
19
MCB Selection Chart
LOAD-WATTAGE
1 Ton
1.5 Ton
2 Ton
1200-2000W
3000W-4000W
4000W-6000W
1000W
2000W
400W
600W
750W
1750W
750W
750W
1250W
800W
2000W
1500W
200W
400W
300W
1300W
1800W
2200W
500W
700W
1000W
1200W
400W
200W
60W
40W
Air Condioner
Water Heater 8 Ltrs
15 Ltrs
60 Ltrs
Room Heater
Refrigerator 165 Ltrs
285 Ltrs
350 Ltrs
Oven Cum Griller
Oven Only
Iron
Microwave
Hot Plate Only
Electric Kele
Mixer Grinder
Washing Machine
Water Filter
Water Cooler
Hair Dryer
Auto Toaster
Vacuum Cleaner
TV - Remove / VCR
Fan
Lamp, Tubelight
APPLIANCES MCB RATING
10A
16A
20A
12A
20A
32A
6A
10A
3A
4A
6A
10A
6A
5A
7.5A
6A
10A
7.5A
1.5A
3A
2A
7.5A
10A
16A
3A
6A
6A
7A
3A
1A
*
*
TYPE OF MCB
C
C
C
B
B
B
B
B
C
C
C
B
B
B
B
B
B
B
C
C
C
C
C
C
C
B
B
B
B
B
B
B
WIRE SIZE
2.5 sq. mm
4.0 sq. mm
4.0 sq. mm
2.5 sq. mm
6.0 sq. mm
10 sq. mm
1.5 sq. mm
2.5 sq. mm
1.5 sq. mm
1.5 sq. mm
1.5 sq. mm
2.5 sq. mm
1.5 sq. mm
1.5 sq. mm
2.5 sq. mm
1.5 sq. mm
2.5 sq. mm
2.5 sq. mm
1.0 sq. mm
1.0 sq. mm
1.0 sq. mm
1.5 sq. mm
2.5 sq. mm
4.0 sq. mm
1.0 sq. mm
1.5 sq. mm
1.5 sq. mm
1.5 sq. mm
1.0 sq. mm
1.0 sq. mm
1.0 sq. mm
1.0 sq. mm
Formula For Load Calculation:
• Incomer Rang: Single Phase*
Total Load in Was
230 Volts
=
• Incomer Rang: Three Phase*
* The given data is for guidance only. It may vary for different products. The company will not take any responsibility for these selecons.
Total Load in Was
3 X 415 Volts
=