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Introduction to :

Surge protection devices

Surge protection devices

A surge protector (or surge suppressor) is an appliance

designed to protect electrical devices from voltage

spikes. A surge protector attempts to limit

the voltage supplied to an electric device by either

blocking or by shorting to ground any unwanted

voltages above a safe threshold.

Surge arresters type 1 Surge arresters type 2

Surge arresters type 3 Surge arresters

Surge suppressors Single-pole surge arresters

Low voltage surge arresters Medium surge arresters

S u r g e a r r e s t e r s t y p e 1

Surge arresters type 1 can also be referred to as

secondary surge arresters. Secondary surge

arresters are mainly located in the main panel

board in order to divert to the ground the high

amount of energy coming from lightning strike.

Surge arresters type 1 have the main function

of preventing sensitive electronics from

damaging effects of electrical surges. Surge

arresters type 1 are designed to discharge high

energies from lightning related impulses while

ensuring equipotential bonding in cases of direct

lightning strike on installations fitted with these

equipment.

S u r g e a r r e s t e r s t y p e 2

Surge arresters type2 are usually installed

downstream of type 1 surge arresters in

main distribution boards or sub- distribution

boards found in electrical circuits or buildings

and machinery with the devices installed on

them.

Type 2 surge arresters protect low- voltage

systems from transient over-voltages that may

arise. Spark gaps found in surge arresters

type 2 are normally tripped in nature hence

elimination of the need to use decoupling

reactors during installation of these over-

voltage protection devices.

S u r g e a r r e s t e r s t y p e 3

Surge arresters type 3 electrical devices are

mainly used for protecting terminal equipment

from over- voltage transients caused by both

external and internal events. Different types

of enclosures easily available for

installation procedures allow easy installations

close to terminal equipment.

Surge arresters type 3 normally block lower

level surges that are highly damaging to

sensitive household electronics. Surge arresters

type 3 devices are used to provide point of use

protection hence are considered the last line of

defense for electronic equipment and appliances

in a whole house range protection electrical

network.

S u r g e a r r e s t e r s

Wikipedia the free encyclopedia defines surge

arresters as devices used to protect electrical

equipment from over- voltage transients caused

by external events like lightning or internal events

like switching processes.

Surge arresters can also be referred to as surge

protection devices going by the acronym SPD or

transient voltage surge suppressor with the

acronym TVSS.

Surge suppressors

Surge suppressors are also referred to as surge

protectors by various manufactures due to their

use in protecting equipment and machinery.

Webopedia defines surge protectors as types

of electronic devices that shield computers and

electronic devices from surges in electrical

power or transient voltage that flow from the

power supply.

Surge suppressors mainly work by

channeling surplus voltage into the

designated outlets grounding wire preventing

them from flowing into the electronic appliances

fitted or directly connected to them.

Single-pole surge arresters

Single- pole surge arresters. These are devices

used to protect electrical equipment and

machinery from random and dangerous power

surges in a single- pole state.

Single- pole surge arresters are capable of

protecting terminal equipment and have a higher

lighting current discharge hence making them

more effective in terms of protection.

Low voltage surge arresters

Low voltage surge arresters are electrical

devices used to protect equipment and

machinery from over- voltage transients in low-

voltage distribution systems. Low voltage surge

arresters can be used as electrical appliance

protectors or as low voltage distribution

transformer windings.

These types of surge arresters can be used for

both indoor and outdoor applications. LOVOS is

a common acronym used to describe low

voltage surge arresters in the engineering field.

Medium-voltage surge arresters

Medium votage surge arresters are indoor and

outdoor electrical installation geared towards

protecting electric transformers, switch-gears

and transmission lines in electrical based MV

systems that are most likely to experience power

surges.

Medium voltage surge arresters can be

designed for both alternating current or direct

current related equipment and installations. The

over-voltages that medium voltage surge

arresters protect equipment from may be

atmospheric in nature or those brought about

by switching processes in electrical circuits.

Fuse switches

They are low voltage switching devices that

enable safe manual connecting and

disconnecting of electrical circuits under load.

Fuse- switches can also be referred to as fuse

combination switches depending on the type of

manufacturer.

These types of electrical safety devices can be

either automatic in nature or allow mechanical

handling by human beings.

Fuse holder

As the name fuse holder suggests, these are

devices or equipment used to keep electrical

fuses in their required positions preventing them

from interacting with other electrical devices

found in machinery or equipment.

Most of the fuse holders have insulation

properties hence do not influence electrical

circuits or affect them in any way possible.

S u r g e p r o t e c t i o n d e v i c e s

Contact details : VISUM Ltd. Letna 40 040 01 Kosice Slovakia - E.U.

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