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Signage Civil & MEP

Al Inshrah is also well known in the industry, as the leading manufacturer and supplier of all kinds of Signs, Underground Warning tapes, Engraving, Acrylic Fabrication etc.

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Busbar Trading

Al Inshrah also plays a major role in busbar trading, as we are one of the leading stockists of Tinned/Bare Copper Busbar in the Middle East.

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Signage Material Trading

We deliver really a wide range of sign materials both for indoor uses and outdoor purposes. PVC/Traffolyte/Acrylic Sheets/Engraving Cutter, Colour vinyl rolls, Indoor/Outdoor...

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Panel Board Accessories

Bakelite Sheets
Bakelite Sheets
Bakelite Sheets

Paper Based Bakelite Sheets are widely appreciated and used in Electrical and Automobile industries because of their extraordinarily high resistance to electricity, heat, chemical action and mechanical strength. Paper Based Industrial (Bakelite) boards are manufactured by using Kraft paper as reinforcement with specially formulated phenolic resin as bonding media.

Bakelite Sheets are made from premium quality raw materials that are highly in demand for their dimensional accuracy, mechanical strength, heat resistance and low absorption of water.We offer these Paper Based Bakelite Sheets, also known as PhelonicLamininated Sheets, is double-sided high-pressure laminate, which is well known for its electrical insulation properties and available in various varieties, grades, and specifications to meet the specific requirements of the clients.

Type: - Insulation Sheet
Material: Paper Base
Color: Brown, Gray
Application: Low Voltage
Paper Phenolic Sheet as per IS (IS2036-1995) / (BS 2572) - P1, P2, P3 & P4.
European Standard EN 60893-3-4-1995- PF CP201, 203,204 & 206.
Nema Standard LI 1-2001-Nema -X, XP, XX & XXX.
German Standard DIN-7735, HP-2061, 2061.5, 2061.6, 2062.8.
Australian Standard as 1795-1983-type X Meter Panel.
Thickness: 0.5mm to 50 mm.

Bakelite Terminal
Bakelite Terminal
Bakelite Terminal
Bakelite Terminal
Busbar Heat Shrinking Sleeve
Busbar Heat Shrinking Sleeve
Busbar Heat Shrinking Sleeve

“Shrinking Sleeves" used to Insulate “Bus Bars and Conductors” provide excellent insulation with a High Dielectric Strength & a Good Retention of Dielectric Strength even under Wet Conditions. The sleeves are manufactured from high quality non tracking cross-linked polyolefin material. Meets ANSI C37.20.2 standards for MV switchgear application up to 36 KV.

Physical & Electrical Properties

Tensile Strength: > 300 kg/Sq. Cm.
Ultimate Elongation : > 250 %
Insulation Resistance : 3 x 106 Mega ohms (at R/T)
Dielectric Strength : 12 KV ( B.D.V. : 15 KV )
Shrink Temperature : 120o Centigrade
Shrink Ratio : MD - 10 % TD - 40 %
Continuous Operating Tempt : - 05 to 110o Centigrade
Corrosive effect - Non Corrosive : Resistant to acid, alkalis & oil
Fire Retardation : Self-extinguishing, Non flammable
Type : Creased type
Sizes Available : L/F size 41mm to 240 MM
Bus Bars Size : 25 x 6 to 200 x 12 MM
Thickness : 0.20 to 0.40 MM
Std. Color : Red, Yellow, Blue & Black
Std. Length / Roll : 50 to 100 meters
Shelf Life : 6 months, stored below 25o Centigrade

Busbar Support
Busbar Support
Busbar Support

The busbar supports are used to create a 3 or 4-pole busbar system with conductor heights from 30 – 100 mm. The bar can have both individual conductors and double conductors per phase. Different phase center spacings permit adaptation of the busbar system to different room dimensions or concepts with different short-circuit strengths. The nominal operating voltage according to IEC 61439 is 1000VAC or 1500VDC.

When it comes to short-circuit current, a distinction is made between surge current and continuous short-circuit current. It is the continuous short-circuit current that is responsible for heating the conductor. It is proportional to the current square I² and the duration of the short circuit t.

The surge current generates the maximum force that is exercised on the current-carrying conductors and therefore on the supports. The spacing between two neighboring supports can be changed to absorb the forces of the maximum expected surge current. This dependence for supports SH1 and SH3 is shown in the diagram. With a given current, this permits calculation of the maximum admissible spacing between the busbar supports for different bar formats. The maximum spacing differs between busbar supports.

Surge current

With a Cu bar measuring 30x10 mm and a support spacing of 250 mm, the maximum short-circuit current is 110 kA

The busbar supports are made of glass fiber-reinforced polyamide 6.6 and are self-extinguishing in line with UL 94 V0. The material permits a maximum bar temperature of 120°C and is halogen free. The top and bottom sections of a support are identical, thereby ruling out the problem of interchanging. The two support sections are connected to each other via threaded rods or threaded bolts. The spacing of the support sections is defined by so-called spacers to suit the bar height.

5 supports are required for laying within a switch cabinet. This is why the busbar supports are available in packs of 10, equivalent to 5 supports.

The length of the required threaded rods depends on the bar height plus the length for securing of the support on the base structure.

Din Rail Terminals
Din Rail Terminals
Din Rail Terminals

A full range of single-level and two-level feed-through screw connection DIN-Rail terminal, test, disconnect and grounding blocks.

Many blocks are available in multiple colors for easy circuit identification, plus popular single and double-bridge shaft systems for maximum power distribution flexibility. Certifications include UL1059, cURus, IEC60998 and IEC60947-7.

High Short-Circuit Current Rating (SCCR) rated to help ensure compliance with NEC® 110.10
Available side-insertion and top-insertion bridges offer unmatched power distribution possibilities
Multiple colors, partition plates, marking system and labels provide easy circuit identification
UL 94V0 Flammability rated material with superior electromechanical properties
Zinc-plated steel wire cage and tin-plated copper conductive elements assure high pressure contact force and low voltage drop


An ELCB is a specialized type of latching relay that has a building's incoming mains power connected through its switching contacts so that the ELCB disconnects the power in an earth leakage (unsafe) condition. The ELCB detects fault currents passing from live (hot) to the earth (ground) wire within the installation it protects. If sufficient voltage appears across the ELCB's sense coil, it will switch off the power, and remain off until manually reset. An ELCB however, does not sense fault currents passing from live to any other earthed body.

An Earth Leakage Circuit Breaker (ELCB) is a safety device used in electrical installations with high impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected.

RCCB:-A residual current device (RCD), or residual current circuit breaker (RCCB), is an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the phase ("hot") conductor and the neutral conductor. Such an imbalance is sometimes caused by current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit. A lethal shock can result from these conditions; RCDs are designed to disconnect quickly enough to mitigate the harm caused by such shocks.

Difference between ELCB & RCCB

ELCB is a device that is used to detect leaking currents from an installation when the power is cut while RCCB is an electric device that disconnects power when the flow of power is not balanced at phase.ELCB has a protection for earth leakage whereas the RCCB has the dual protection features of ELCB and MCB

ELCB is a voltage operated device.RCCB is a current operated device.IN ELCB, Trip coil is connected between system ground and non-current carrying part of the machines.RCCB having CBCT(Core Balanced Current Transformer).CBCT consists of 2nos of primary winding (P1,P2) and one secondary winding(S1).Primary windings are in series with the load and secondary winding connected to Trip coil. In case of healthy time, voltage in both the primary windings will be cancelled and hence no voltage on secondary winding. During the leakage or If anybody touch the live wires of the machines, current will passing through the body and connected to ground. It will cause the voltage difference in primary windings and induced voltage in secondary operates the trip coil (operating time 50ms).


We cover a huge range of electrical enclosures, Our Enclosures adhere to the IEC's standards for determining enclosures' capabilities. Their International (or Ingress) Protection IP rating system defines an enclosure's protective capacity, and then assigns an IP Code. The code labels an enclosure's IP followed by two numbers; the first digit shows the extent to which equipment is protected against particles, and the second digit indicates the extent of protection against water. Our IP54 enclosures have a high level of protection against particles, and a fair amount of protection against water. All of our enclosures rigorously comply with the guidelines, so you can count on quality and cost-efficient enclosures.Our most common IP ratings are probably 65, 66, 67 and 68. So for quick reference, these are defined below:

IP65 Enclosure - IP rated as "dust tight" and protected against water projected from a nozzle.
IP66 Enclosure - IP rated as "dust tight" and protected against heavy seas or powerful jets of water.
IP 67 Enclosures - IP rated as "dust tight" and protected against immersion.
IP 68 Enclosures - IP rated as "dust tight" and protected against complete, continuous submersion in water.

Features of our cabinets include:

1. Customizable metal finishes, including aluminum alloys, stainless steel, galvanized steel and carbon steel, to meet your application requirements. Finishes available include wet coat and powder coat painting, anodizing
2. Security and tamper-resistant hardware
3. Environmental controls, including thermostats, heat strips, air conditioning, passive or fan-assisted venting and insulation
4. Light switches
5. Viewing windows
6. Fuse blocks and power panels
7. Casters, support legs and risers
8. Range of installation options, including free-standing, pad mounted, wall mounted, pole mounted and walk-in

Electrical enclosures are rated by Type (NEMA 250 / UL 50, 50E), and/or IP rating (IEC 60529) based upon the degree of protection provided. Type ratings and IP ratings have only the following in common:

1. A degree of protection for persons from hazardous components inside the enclosure
2. A degree of protection for equipment inside the enclosure from ingress of solid foreign objects, including dust
3. A degree of protection for equipment inside the enclosure from ingress of water

NEMA 250 and UL 50, 50E Type rating documentation defines additional requirements that a Type-rated enclosure must meet. These include:

Mechanical impact on enclosure walls
Gasket aging and oil resistance
Corrosion resistance
Door and cover latching requirements
Sheet metal gauge construction requirements (UL 50 only)

Electrical enclosures that carry only an IP rating have not been designed or tested to the additional Type-rating requirements. For this reason, and because the tests and evaluations for other characteristics are not identical, the IP ratings cannot be exactly equated with NEMA enclosure Types.

IP Ratings

IP (or "Ingress Protection") ratings are defined in international standard EN 60529 (British BS EN 60529:1992, European IEC 60509:1989). They are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc) and moisture.

Numbers in an IP Rating

The numbers that follow IP each have a specific meaning. The first indicates the degree of protection (of people) from moving parts, as well as the protection of enclosed equipment from foreign bodies. The second defines the protection level that the enclosure enjoys from various forms of moisture (drips, sprays, submersion etc). The tables below should help make sense of it:

IP Rated Enclosures - quick find chart

A number replaced by x indicates that the enclosure is not rated for that spec

First Digit (intrusion protection)

Second Digit (moisture protection)


No special protection


No protection


Protection from a large part of the body such as a hand (but no protection from deliberate access); from solid objects greater than 50mm in diameter.


Protection against condensation.


Protection against fingers or other object not greater than 80mm in length and 12mm in diameter.


Protection against water droplets deflected up to 15° from vertical


Protection from entry by tools, wires etc, with a diameter of 2.5 mm or more.


Protected against spray up to 60° from vertical.


Protection against solid bodies larger than 1mm (eg fine tools/small etc).


Protected against water spray from all directions.


Protected against dust that may harm equipment.


Protection against low pressure water jets (all directions)


Totally dust tight.


Protection against string water jets and waves.




Protected against temporary immersion.




Protected against prolonged effects of immersion under pressure

Insulator HV & LV
Insulator HV & LV
Insulator HV & LV

Bus Bar Insulators mainly made from bulk molding compound, unsaturated polymer with fiber glass. Product itself are with good properties such as electrical resistance, hear resistance, fire resistance, low shrinkage, water resistance.


1. Polyester without halogen.
2. UL94 VO self-extinguishable.
3. Colour red RAL 3002.
4. Operating temperature from - 40oC to + 130oC.
5. Deformation under load temperature (ASTM D643): 200oC
6. Dielectric constant (ASTM D150): 4/5.
7. Arc resistance (ASTM D495): > 180 s.


A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.

A Miniature Circuit Breaker (MCB) is a device that switches and/or protects the lowest common distributed voltage in an electrical system. It is designed to protect conductors and insulation from damage due to overload and short circuit.Miniature circuit breakers are not just for residential applications only. They are used in residential, commercial and industrial applications.In an industrial or commercial application, miniature circuit breakers can be found in load centers, lighting panel boards and individual mountings.

Miniature circuit breaker construction is simple, yet very precise. In fact, a miniature circuit breaker has no replacement parts. It is not designed to be maintained. When a unit goes bad, it is simply replaced.

The trip unit is the brain of the miniature circuit breaker. It activates the operating mechanism in the event of a prolonged overload or short circuit. This type of circuit breaker uses a thermal magnetic mechanism. This is the predominant trip unit technology used in the domestic market. A bimetal and an electromagnet work together to provide overload and short-circuit protection.

Specifications for miniature circuit breakers vary widely. As such, there is a miniature circuit breaker to fit virtually any application, standard, and local code requirement. In general, miniature circuit breakers are often categorized by the following:

Number of poles
Mounting methods

Miniature circuit breakers are typically available in single pole and double pole types. A pole is a hot conductor. It is a space in a load center, panel board, or similar device where a breaker can be attached. A single pole breaker disconnects one conductor, and a double pole breaker disconnects two conductors. Single pole breakers are associated with 120 volts, while double pole breakers are associated with 240 volts.

Three pole miniature circuit breakers are available, but are not as popular as the other two types. They are typically used in industrial applications. Miniature circuit breaker poles are generally one inch in width. However, some breaker designs allow two poles to fit in the standard one-inch space. This breaker type is called a duplex circuit breaker (or “half-size branch circuit breaker”).

Miniature circuit breakers fall into two categories. These are:


Residential miniature breakers are only of the plug-in type. These are designed for residential load centers, commercial units, and light industrial applications. They typically range from 10 to 125 amps, with an interrupting rating of 10 or 22 KAIC.


These breakers are designed for three types of mounting applications: plug-in, bolt-on, and cable-in/cable-out. (We will look at mounting methods shortly.) Industrial miniature breakers are designed to protect small branch circuits in commercial or industrial electrical distribution systems. They are applied in load centers, lighting panel boards or individual mounting applications. They typically range from 6 to 125 amps, with an interrupting ratings as high as 65 KAIC.



A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city

The traditional molded-case circuit breaker uses electromechanical (thermal magnetic) trip units that may be fixed or interchangeable. An MCCB provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device. Both these devices act mechanically on the trip mechanism.

Depending upon the application and required protection, an MCCB will use one or a combination of different trip elements that protect against the following conditions:

1. Thermal overloads

In an overload condition, there's a temperature buildup between the insulation and conductor. If left unchecked, the insulation's life will drastically reduce, ultimately resulting in a short circuit. This heat is a function of the square of the rms current (F), the resistance in the conductor (R), and the amount of time the current flows (t).

If you monitor current flow and time, you can somewhat predict and detect overload conditions. By using a time-current curve, as shown in Fig. 1, you can see the boundary between the normal and overload conditions. Here, we see that the thermal or overload element of the MCCB will initiate a trip in 1800 sec at 135% of rating (shown here as Point 1), or in 10 sec at 500% of rating (shown here as Point 2).

2. Short circuits

Usually, a short circuit occurs when abnormally high currents flow as a result of the failure of an insulation system. This high current flow, termed short-circuit current, is limited only by the capabilities of the distribution system. To stop this current flow quickly so that major damage can be prevented, the short circuit or instantaneous element of an MCCB is used.

A typical time current curve for an instantaneous element, as shown in Fig. 2, shows that it will not initiate a trip until the fault current reaches or exceeds Point 1.

3. Ground faults

A ground fault actually is a type of short circuit, only it's phase-to-ground, which probably is the most common type of fault on low-voltage systems (600V or less).

Usually, arcing ground-fault currents are not large enough to be detected by the standard MCCB protective device. But, if left undetected, they can increase sufficiently to trip the standard protective device. When this happens, it usually is too late, and the damage is already done. An example of this is a motor having an internal insulation failure. While the current flow may be small, it must be detected and eliminated before major motor damage takes place.

MCCB (Molded Case Circuit Breaker)- is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A. Its rated current is up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings. MCCB is having some special characteristics over MCB. It protects loads from over current, short circuit current and earth fault protection.


MCCB Was originally an IEC term meaning Molded Case Circuit Breaker, but has been very well adopted in NEMA world now, at least at the engineering level. Many rank and file electricians still are not familiar with that acronym because its widespread use in NEMA world is fairly recent. MCCBs generally range from 15A to 1600A, with a few exceptions at either end, and generally start at 14kAIC but go up to 100kAIC for applications with high fault current capacity. There are versions that are Current Limiting (CL) as well. MCCBs are typically sealed units and cannot be serviced, although in larger sizes there are versions with interchangeable parts that can be replaced such as trip units and switch bodies.

Panel Mount Indicators
Panel Mount Indicators
Panel Mount Indicators


A DIN rail is a standardized thirty five millimeter wide metal bar that has a hat-shaped cross section which is widely used for mounting circuit breakers,relays , meters etc and industrial control equipment inside equipment racks. The abbreviation "DIN" stands for DeutschesInstitutfürNormung, the German organization of standards that defines the size and shape of DIN rails. A DIN rail's length can be cut as needed by the person installing the rail and circuit breakers

The standard DIN rail used is 35mm wide. However, there are types of the rail having lesser widths such as 15mm or 7.5 mm.

The European Standard EN 50022 and the IEC standard 60715 specify the DIN rail for mounting low voltage switchgear and control gear.

There are three major types of DIN rail:

1. Top hat section, type O, or type Ω, with hat-shaped cross section.


This 35-mm wide rail is widely used to mount circuit breakers. The EN 50022 standard specifies both a 7.5 mm (shown above) and a 15 mm high version, which are officially designated

top hat rail EN 50022 – 35 × 7.5
top hat rail EN 50022 – 35 × 15

Some manufacturer’s catalogues also use the terms Top hat section / Type O / Type Omega (Ω)

2. C section


3. G section

G-type rail (according to EN 50035, BS 5825, DIN 46277-1).


A residual-current device (RCD), or residual-current circuit breaker (RCCB) or residual twin-direct current couplet (R2D2), is an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the energized conductor and the return neutral conductor. Such an imbalance may indicate current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit. A lethal shock can result from these conditions. RCCBs are designed to disconnect quickly enough to prevent injury caused by such shocks. They are not intended to provide protection against overcurrent (overload) or all short-circuit conditions.

The Fault current overloads and short circuits can be detected by circuit breakers like MCB’s MCCB’s& HRC Fuses etc. But, Circuit breakers don’t detect leakage currents, which are dangerous for humans and livestock and if not detected can lead to fire hazards. We need a solution that detects such leakages currents and disconnects the circuits from the power supply. The solution is RCCB (Residual Current Circuit Breaker) also known as ELCB (Earth Leakage Circuit Breaker) which provides protection against direct and indirect contact of personnel or livestock and against probable fires.

RCCB works on the principle that in an electrical circuit the incoming current is the same as outgoing current as shown in the Diagram. RCCB incorporates a core balance transformer having primary and secondary windings and a sensitive relay for instantaneous detection of fault signal.

The primary winding lies in series with the supply mains and load. Secondary winding is connected to a very sensitive relay. In a faultless situation, the magnetizing effects of the current carrying conductors cancel each other out. There is no residual magnetic field that could induce a voltage in the secondary. During flow of leakage current in the circuit an imbalance is created in the circuit which gives Rise to leakage flux in the core. This leakage flux generates an electrical signal that is sensed by the relay and it trips the Mechanism thereby disconnecting the supply. When pressing the TEST button 'T', a fault is simulated via the Test resistance & RCCB trips.



A terminal is the end of a wire that can be fitted with a connector to provide a connection from one electronic device to another.

An electrical connector is an electro-mechanical device for joining electrical circuits as an interface using a mechanical assembly. Connectors consist of plugs (male-ended) and jacks (female-ended). The connection may be temporary, as for portable equipment, require a tool for assembly and removal, or serve as a permanent electrical joint between two wires or devices.[1] An adapter can be used to effectively bring together dissimilar connectors.

There are hundreds of types of electrical connectors. Connectors may join two lengths of flexible copper wire or cable, or connect a wire or cable or optical interface to an electrical terminal.

We carry a large selection of quality wire terminals. include ring terminals, push-on terminals, bullet terminals, spade or fork terminals, and butt splices. are manufactured from tin-plated copper for maximum conductivity, and come in either bare non-insulated form, with vinyl insulation, more durable nylon insulation, or high performance heat shrink insulation. High temperature wire terminals made from nickel plated steel are also available that can handle temperatures up to 900°F. Most terminals are available for wire sizes from 22 gauge to 10 gauge. We also carry butt splices, ring terminals, and copper eyelets for wire sizes from 8 gauge to 4/0.

ring terminals and spade terminals (sometimes called fork or split ring terminals). Electrical contact is made by the flat surface of the ring or spade, while mechanically they are attached by passing a screw or bolt through them. The spade terminal form factor facilitates connections since the screw or bolt can be left partially screwed in as the spade terminal is removed or attached. Their sizes can be determined by the size of the conducting wire AWG and the screw/bolt diameter size designation.