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Horse Power (HP)

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No. of Poles

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Main Switches (2)

HRC Fuses (3)

HPL TPN Main Fuse Switch Unit with HRC Fuse

14,84023,980 inc. GST

HPL 200A TPN Main Fuse Switch Unit with HRC Fuse FSSFHR4TPN200

14,840 inc. GST

HPL 320A TPN Main Fuse Switch Unit with HRC Fuse FSSFHR4TPN320

16,720 inc. GST

HPL 400A TPN Main Fuse Switch Unit with HRC Fuse FSSFHR4TPN400

23,980 inc. GST

HPL Main Switch Fuse Unit

1,13011,370 inc. GST

HPL 32A 2 Pole Main Switch Fuse Unit SFSRW2DP32

1,130 inc. GST

HPL 32A TPN Main Switch Fuse Unit SFSRW4TPN32

1,720 inc. GST

HPL 63A TPN Main Switch Fuse Unit SFSSD4TPN63

3,550 inc. GST

HPL 100A TPN Main Switch Fuse Unit SFSSD4TPN100

6,450 inc. GST

HPL 200A TPN Main Switch Fuse Unit SFSRW4TPN200

11,370 inc. GST

L&T Switchgear 2A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90144

112 inc. GST

L&T Switchgear 4A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90145

112 inc. GST

L&T Switchgear 6A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90146

112 inc. GST

L&T Switchgear 8A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90147

112 inc. GST

L&T Switchgear 10A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90148

112 inc. GST

L&T Switchgear 16A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90150

112 inc. GST

L&T Switchgear 20A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90151

112 inc. GST

L&T Switchgear 25A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90152

112 inc. GST

L&T Switchgear 32A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90142

112 inc. GST

L&T Switchgear 40A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90143

124 inc. GST

L&T Switchgear 50A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90158

265 inc. GST

L&T Switchgear 63A HRC Fuse Cylindrical HF Size 14 X 51 80kA SF90159

322 inc. GST

L&T Switchgear HRC Fuse Cylindrical HF Size 14 X 51 80kA

112322 inc. GST

L&T Switchgear 63A HRC Fuse DIN HN Size 000 100kA SF94940

354 inc. GST

L&T Switchgear 80A HRC Fuse DIN HN Size 000 100kA SF94941

377 inc. GST

L&T Switchgear HRC Fuse DIN HN 100kA

3542,015 inc. GST

L&T Switchgear 100A HRC Fuse DIN HN Size 000 100kA SF94942

382 inc. GST

L&T Switchgear 125A HRC Fuse DIN HN Size 000 100kA SF94946

437 inc. GST

L&T Switchgear 63A HRC Fuse DIN HN Size 00 100kA SF94027

442 inc. GST

L&T Switchgear HRC Fuse DIN HN 100kA – 80A, 00

442 inc. GST

L&T Switchgear 100A HRC Fuse DIN HN Size 00 100kA SF94029

442 inc. GST

L&T Switchgear 125A HRC Fuse DIN HN Size 00 100kA SF94030

469 inc. GST

L&T Switchgear 160A HRC Fuse DIN HN Size 00 100kA SF94939

469 inc. GST

L&T Switchgear 80A HRC Fuse DIN HN Size 0 100kA SF94128

621 inc. GST

L&T Switchgear 100A HRC Fuse DIN HN Size 0 100kA SF94129

621 inc. GST

L&T Switchgear 125A HRC Fuse DIN HN Size 0 100kA SF94130

621 inc. GST

Main Switch and HRC Fuses

Main Switch

The Main Switch is a crucial part of a control panel that regulates the flow of electricity entering the panel.

The main switch is the first part the power runs into that connects or disconnects the flow of electrical power in the house. “Mains or Main Switch”is responsible for interrupting or continuing the inflow of power. A number of reasons like lightning strikes, power surges from the utility company, or an overload to the electrical panel could all cause a catastrophe like spark turning into fire. The switch kills the power supply in case of overload.

It is the first and biggest switch in a circuit breaker (about 60 to 100 amps) and under it or to the side is a row of smaller breaker, maybe 10 or 15 or 20 amps each, that go to each area of the house.

Applications

a) The Main Switch can measure
• Voltage
• Current
• Consumed capacity of the battery connected in the model
• Temperature.

b) Prevents the connectors from sparking when connecting the batteries.

It’s important to know about the location of main switch, so you can turn it off in an electrical emergency. Some facilities and areas might have more than one main switch. If there is more than one fuse board installed, it is advised to turn on circuits individually after resetting the main breaker.

HRC (High Rupturing Capacity)

A  hrc fuse is a part of the circuit which consists of a conductor that melts easily and breaks the connection when current exceeds the predetermined value.

Definition

HRC fuses (High Rupturing Capacity Fuses) referring to their capability to interrupt high current is a kind of cartridge fuse, where the fuse wire enclosed by the cartridge having good mechanical strength, carries short circuit current in a set period and if a fault occurs in the circuit, it blows off.

The enclosure or casing of the fuse is tightly shut to avoid the atmospheric air. At both sides of the fuse, the ceramic enclosure is made with a metal cap which is welded with fusible silver wire. Its enclosure includes some space surrounding the wire.

Application

• Used for protection of Transformers, Motors, automobile, etc.
• It is also used in motor stators.
• Backup protection.

Operation:

High Rupturing Capacity (HRC) fuse is an enclosed fuse that is filled with silica sand surrounding the fuse link. (It is used on appliances where the fault current needs to be quenched fast with no spark or fire). In this kind of fuse, the breaking capacity is increased by using two or more separate silver elements in parallel.

Working:

• The flow of current in an electrical network is in a fixed limit and does not break the circuit.

• When current overflows in a fault, a tremendous amount of heat is produced within the fuse.

• When the flow of current has a high thermal energy then pieces of equipment that are connected to the network are damaged permanently.

When the over rated current flows through the HRC fuses, the eutectic element is melted and dissolve in the fuse.

• The filling powder is of such a quantity that the chemical reaction between the silver vapour and the filling powder forms a high electrical resistance substance which very much help in quenching the arc.

HRC Fuse with tripping device.

• When a hrc fuses blows out the tripping device during the fault conditions , it will cause the circuit breaker to operate thus severing the circuit.
The body of fuse is made of ceramic material with a metallic cap fixed at each end.

Advantages of HRC Fuse

During severe faults the HRC fuse breaks the circuit before the peak fault current is reached.
Inexpensive and economical circuit breaker.
Avoids the necessity of replacing the fuse (tripping HRC).
Do not deteriorate with age.
Low voltage H.R.C fuses are also available in a capacity of 16000A to 30,000A at 400V (Also available in range of 80kA to 120kA) .
It clears high as well as low fault currents.
Having high-speed or quick operation.
Does not explode like the glass fuses under high current.
Fusing operation is fast without noise and smoke.
Capable of handling high as well as low currents.

Disadvantages of H.R.C Fuse:

Replacement Cost.
Heat produced by the arc might affect the related switches.

Types of HRC Fuse:

1. NH Fuse
2. Din type
3. Blade contact

NH Fuse

• The NH Fuse is a ceramic cased rectangular fuse having a metallic blade like terminals on both ends and protection against short circuits and overloads.
• The internal fuse element is attached to the external blades. Mostly these fuses have trip indicators to reveal is the fuse is intact or not.
These are available in different weights and sizes and the metallic extraction lug facilitates easy removal of the fuse using correct tools.

Din fuse

• These are accessible in a broad range of rated currents and are used in different fields for different reasons including their feature at different temperature states.
• These are accessible to different levels of voltages and used to protect the transformer. The cleaning capacity of this is excellent for perfect with the short-circuit act.
• These are used in air & mining, feeder sectionalizing, gas-insulated switchgear, and transformers.

Blade Contact

• This type of fuse is also called plug-I or spade. These are available with plastic body & two metal caps to arrange within the socket.
• Generally, these are used in cars to give protection from short circuits, wiring, and used in motors for backup protection.
• These are available in less weight and include less cutoff current.
Blade type fuses are available in various sizes & shapes along with the capacity of different current ratings.

Known brands of HRC fuses

A. Siemens


B. HPL


C. Bussmann


D. SIBA

E. Anchor

Main switches and HRC Fuses fuses are very crucial for the safe functioning of circuits, facilities and appliances. The correct use and choice of these devices can prevent a catastrophe.

There are a number of choices available in the market to suit your panel. Take an expert advice instead of buying a fuse that might not be the best for you. One can buy it from online websitse.