3 phase SPD connection:

This diagram shows how to make 3 phase SPD connection. In this circuit, we use a three-phase energy meter, an FP MCB ( 4 Pole Miniature Circuit Breaker ), an SPD ( Surge Protection Device ), an RCBO ( Residential Current Circuit Breaker ), a Busbar, a Three Phase Motor. This diagram is very easy to connect. If you want to know more about this circuit please check our youtube video in the below article.


Diagram of 3 phase SPD connection:

3 phase SPD connection

Components needed For this Project:

You can get the components from any of the sites below:

  1. [three_phase_meter]
  2. FT MCB 30A [See Buy Click Amazon]
  3. TP SPD 20KA [See Buy Click Amazon]
  4. TP RCBO 20A [See Buy Click Amazon]
  5. Busbar wire [See Buy Click Amazon]
  6. 3 Phase Motor (5 HP) [See Buy Click Amazon]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

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Components used to make the 3 phase SPD connection:

01. 3 Phase Energy Meter:

The Meter Which is used for Measuring the Power of the 3-phase supply is known as the 3-phase energy meter. A 3-phase Energy meter is a 3-phase 4-wire direct Connected meter that is Used to estimate the electricity on the Three-phase power supply, mostly for residential & commercial use. A 3-phase meter helps consumers & utilities in revenue protection. The 3-phase meter is Constructed by Connecting the 2 single-phase meters through the shaft.

02. FP MCB:

4 pole MCB for 4-Wires Connections, the one additional 4th pole for Neutral Wire Connection so that between Neutral and any of the other three will supply. In 4-Pole MCB the Neutral Pole is also having Protective release as in the Phase Poles connection. 3 Phase Supply with Neutral. TPN means triple pole TP + Neutral which is 3 - phases and Neutral. but the Protection is given for 3 Phases only and in 4 poles MCB Protection is given to all 3-Phases as well as Neutral. In the case of a 4-pole MCB. A Purpose is not to protect the Neutral but it is rather to Isolate the Neutral.

03. SPD:

The ability of an SPD to limit overvoltage in the Electrical distribution network by diverting the surge current is the surge-protective component, the mechanical structure of the SPD, and the connection to the electrical distribution network. A surge protection device SPD is a component of an electrical installation protection system. This device is connected to the power supply in parallel with the load circuit it is intended to protect. It can be used at all levels of the Power Supply Network. It is widely used in overvoltage protection.

04. RCBO:

An RCBO protects Electrical equipment against 2 types of faults. Residual current and over current. Residual current. or earth leakage as it is sometimes referred to, occurs when there is a break in the circuit which can be caused by faulty electrical wiring or if the wire is accidentally cut. When there is a break in the circuit which may be due to faulty electrical wiring or accidental cutting of the wire. To prevent the current from being redirected and causing an electric shock. the RCBO current breaker stops it.

05. Busbar:

A busbar is a type of Electrical conductor. It is made of copper brass or aluminum. Busbar is most commonly used in factories. We supply the power from the transformer to the busbar. We take the electricity from this busbar to the circuit breaker. The advantage of using a busbar is that through it we can provide multiple power connections in multiple places very easily. How many thick copper bars are aggregates of busbars? A copper bar is rectangular (rectangular) copper type or triangular in shape.

06. Three Phase Motor:

A 3-phase electric motor uses a 3-phase Power Supply to Convert Electric Energy into Mechanical Energy. It contains four Wires (Three hot Wires and one Neutral Wire) and Uses 3 Alternating Currents of the Same Frequency. Since it Generates a Rotating Magnetic Field, it does not need a Capacitor for the Startup. Some 3-phase Motors are Reversible, Which Means they can serve as Generators by Turning Mechanical Energy into Electrical Energy.

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Frequently asked questions

How does SPD work?

Upon sensing a transient overvoltage event, the SPD of the changes into the Diverting Mode. The purpose of an SPD is to divert the damaging impulse current flow away from critical loads, while simultaneously reducing it resulting in the voltage magnitude to a low, harmless level.

Why SPD is important?

An SPD (Surge Protective Device) swiftly detects and diverts any excess in the voltage to earth, resetting itself in a mere 25 nanoseconds. This lightning-fast response ensures seamless protection without interruption to the rest of the installation as only over voltage is redirected to the earth.

What is SPD in a transformer?

Surge Protection Devices (SPDs), also known as Transient Voltage of the Surge Suppressors (TVSSs) are non-linear voltage clamping devices. They are installed across the lines to be protected (in parallel with the equipment) and thus do not need to be rated to the line current flow.

What is Type 3 surge protection?

Type three surge protection completes the protection concept. As device protection, it limits the last remaining pulses which could cause damage to the building installation and system. Type three SPDs are installed directly upstream of the end device.

What is the difference between Type 2 and Type 3 SPD?

Type 2 SPDs could help prevent the spread of overvoltages in electrical installations, and are usually installed in the distribution boards. Type 3 SPDs, which have a low discharge capacity, could be used to supplement Type 2 SPDs to provide protection for sensitive and critical loads.

Read more Single Phase Wiring


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