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Main Switch and HRC Fuses (81)

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HPL 100A Switch Fuse Unit (Main Switch) TPN 415V SFSSD4TPN100

7,454 inc. GST
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HPL 200A Fuse Switch Unit (Main Switch) TPN with HRC Fuse 415V TSF FSSFHR4TPN200

14,470 inc. GST
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HPL 200A Switch Fuse Unit (Main Switch) TPN 415V SFSRW4TPN200

12,278 inc. GST
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HPL 320A Fuse Switch Unit (Main Switch) TPN with HRC Fuse 415V TSK 315A FSSFHR4TPN320

16,314 inc. GST
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HPL 32A Switch Fuse Unit (Main Switch) Double Pole DP 240V SFSRW2DP32

1,308 inc. GST
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HPL 32A Switch Fuse Unit (Main Switch) TPN 415V SFSRW4TPN32

1,950 inc. GST
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HPL 400A Fuse Switch Unit (Main Switch) TPN with HRC Fuse 415V TSMS-S FSSFHR4TPN400

23,398 inc. GST
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HPL 63A Switch Fuse Unit (Main Switch) TPN 415V SFSSD4TPN63

3,999 inc. GST
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L&T Switchgear 100A HRC Fuse Link DIN 100kA Type Size 0 SF94129

565 inc. GST
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L&T Switchgear 100A HRC Fuse Link DIN 100kA Type Size 00 SF94029

420 inc. GST
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L&T Switchgear 100A HRC Fuse Link DIN 100kA Type Size 000 SF94942

335 inc. GST
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L&T Switchgear 10A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90148

102 inc. GST
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L&T Switchgear 125A HRC Fuse Link DIN 100kA Type Size 0 SF94130

565 inc. GST
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L&T Switchgear 125A HRC Fuse Link DIN 100kA Type Size 00 SF94030

440 inc. GST
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L&T Switchgear 125A HRC Fuse Link DIN 100kA Type Size 000 SF94946

390 inc. GST
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L&T Switchgear 125A HRC Fuse Link DIN 100kA Type Size 1 SF94230

595 inc. GST
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L&T Switchgear 160A HRC Fuse Link DIN 100kA Type Size 0 SF94131

575 inc. GST
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L&T Switchgear 160A HRC Fuse Link DIN 100kA Type Size 00 SF94939

440 inc. GST
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L&T Switchgear 160A HRC Fuse Link DIN 100kA Type Size 1 SF94231

625 inc. GST
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L&T Switchgear 16A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90150

102 inc. GST
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L&T Switchgear 200A HRC Fuse Link DIN 100kA Type Size 0 SF94132

575 inc. GST
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L&T Switchgear 200A HRC Fuse Link DIN 100kA Type Size 1 SF94232

630 inc. GST
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L&T Switchgear 200A HRC Fuse Link DIN 100kA Type Size 2 SF94332

855 inc. GST
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L&T Switchgear 20A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90151

102 inc. GST
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L&T Switchgear 250A HRC Fuse Link DIN 100kA Type Size 1 SF94233

685 inc. GST
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L&T Switchgear 250A HRC Fuse Link DIN 100kA Type Size 2 SF94333

890 inc. GST
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L&T Switchgear 25A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90152

102 inc. GST
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L&T Switchgear 2A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90144

102 inc. GST
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L&T Switchgear 315A HRC Fuse Link DIN 100kA Type Size 1 SF94234

820 inc. GST
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L&T Switchgear 315A HRC Fuse Link DIN 100kA Type Size 2 SF94334

895 inc. GST
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L&T Switchgear 315A HRC Fuse Link DIN 100kA Type Size 3 SF94434

1,260 inc. GST
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L&T Switchgear 32A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90142

102 inc. GST
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L&T Switchgear 400A HRC Fuse Link DIN 100kA Type Size 2 SF94335

900 inc. GST
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L&T Switchgear 400A HRC Fuse Link DIN 100kA Type Size 3 SF94435

1,260 inc. GST
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L&T Switchgear 40A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90143

112 inc. GST
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L&T Switchgear 4A Cylindrical HRC Fuse Link HF 80kA Type Size 14 X 51 SF90145

102 inc. GST
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LOW VOLTAGE SWITCHGEARS

 

An electrical switchgear is a centralised combination of fuses, circuit breakers and switches. When these devices are lined in series, this arrangement is called a switchgear line-up or an assembly.

LOW VOLTAGE  METAL ENCLOSED SWITCHGEAR

A low voltage switchgear is a three phase power distribution device that ensures safe and effective power supply at voltages as high as 1000 V and currents at 6000 A. It is found on the secondary windings of a power supply transformer. This arrangement of the switchgear and the transformer is called a Substation.

ITS FUNCTIONS:

  • It protects the electrical equipment by interruption of short circuits and overload faults
  • It isolates circuits from the power supply, hence handing the control to you.
  • It allows more than one source to feed the load, thus enhancing system availability.

MAIN PARTS OF A LOW VOLTAGE SWITCHGEAR

Typically, a low voltage switchgear system consists of three segregated parts:

  1. BREAKER COMPARTMENT:

It is an arrangement of four vertically aligned power circuit breakers boxed in a compartmentalized manner.

  1. BUS COMPARTMENT:

A set of bus compartments is fixed right behind the breaker compartment, each individualized in solid insulated barriers 

  1. CABLE COMPARTMENT:

Cable Compartment is fixed at the rear of the switchgear with optional compartmentalizing through unvented or vented barriers.

RATINGS A LOW VOLTAGE SWITCHGEAR CAN CARRY

Minimum voltage

upto 635 Volts

Insulation Level

upto 2.2 kV

Power frequency

50 Hz and 60 Hz

Continuous current

upto 10,000 A

Short circuit withstand current

upto 200 kA

Short time withstand current

upto 100 kA and 30 cycles

DIFFERENT TYPES OF LOW VOLTAGE SWITCHGEAR

There are several types of Low voltage switchgear available in the market:

  • MOLDED CASE CIRCUIT BREAKERS (MCCBs):

MCCB’s come in a wide range of ratings specific for low current, low energy power circuits. They come with self contained over current trip devices. They depend upon the thermal magnetic trip elements for their tripping characteristic. They are predominantly used for short circuit protection. MCCB’s with magnetic trips are used in motor circuit protection. Other then this, there are non-automatic circuit breakers as well that provide no overload or short circuit protection, thus are used for manual switching and provide isolation alone.

Click here to buy MCCBs

  • INSULATED CASE CIRCUIT BREAKER

Insulated case circuit breakers are very similar to MCCB’s in their construction, instead they use glass reinforced insulated material for greater dielectric capacity. Various features of an insulated case circuit breaker includes- quick break protection, push to open button, spring-charged mechanism with low torque handles. They are apt continuous current ratings as high as 4,000 A and an interrupting capacity of 200,000 A. They are costly, bigger in size and slightly difficult to maintain. These drawbacks can be overcomed by providing extra parts of the circuit breaker that duplicate the objectives of the costly parts. They are used for light industry or commercial building, etc.

  • POWER CIRCUIT BREAKERS:

These are heavy duty power circuit breakers that use spring operated, energy storing elements for varied electric operations. They work on the draw-out mechanism wherein numerous individual circuit breakers are put to de-energized state for maintenance needs and testing. Their range of continuous frame ratings is between 400 A to 4,000 A, which can still be extended to 5000 A to 6000 A as per needs. Short circuit interruption capacity of a power circuit breaker ranges from 50,000 A to 85,000 A.

  • FUSED POWER CIRCUIT BREAKER:

Typically, these fused power circuit breakers are nothing but an arrangement of bigger unit substation transformers and bigger kVA loads with current limiting fuses. This arrangement provides the short circuit interrupting rating of the switchgear. They are compatible with all frame sizes. The fuse assemblies are directly connected to the circuit breaker making it impossible to take out or install fuses unless the breaker is out of service. They also make use of the blown fuse detection mechanism to ensure the tripping of the breaker right after the fuse is  cleared. Overcurrent trip elements in the breaker handle the overcurrent protection for overloads, implying that the fuse does not clear unless the highest short circuits take place.

SELECTION AND APPLICATION OF LOW VOLTAGE DEVICES

There are certain criteria that must be accorded to while selecting in a Low voltage device (switchgears in this case):

  • The main purpose of installing a circuit breaker is to provide adequate protection.

  • For the protection equipment to perform optimally, an ambient temperature of 40 °C, and if, by any chance, it exceeds, the manufacturer is to be consulted.

  • In case of Fuse power switchgear, the voltage of the system should be compatible with the fuse voltage rating.

Major brands that deal in Low Voltage Switchgears are:

SYSKA LED

HAVELLS

Click here to buy Havells products.

CROMPTON

PHILIPS

BOSCH