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Surge Protection

The whole nature of how electrical equipment is used in homes and at work has evolved; with everyday activities relying on electronic equipment.

Products such as computers, printers, flat screen televisions, industrial control equipment such as PLC’s, alarms, microwaves and washing machines are common place. These can all be vulnerable to transient overvoltages, which can significantly reduce the equipment’s lifespan through degradation and damage.

A transient overvoltage or surge is a short duration increase in voltage measured between two or more conductors. In short this means anything from microseconds (millionths of a second) to a few milliseconds (thousandths of a second) in duration.

Surge Protection Devices (SPD's)

SPD’s protect electrical and electronic equipment against transients, originating from lightning, switching of transformers, lighting and motors.


These transients can cause premature ageing of equipment, downtime, or complete destruction of electronic components and materials.

18th Edition Requirements

The 18th edition BS 7671 now stipulates

Protection against transient overvoltages shall be provided where the consequences caused by an overvoltage could

(i) result in serious injury to, or loss of, human life, or
(ii) result in interruption of public services and/or damage to cultural heritage, or
(iii) result in interruption of commercial or industrial activity, or
(iv) affect a large number of co-located individuals.

For all other cases, a risk assessment according to Regulation 443.5 shall be performed in order to determine if protection against transient overvoltages is required. If the risk assessment is not performed, the electrical installation shall be provided with protection against transient overvoltages.

For a single dwelling unit it will be a decision for the house owner to make whether they consider the small additional cost of the surge protection device justified to protect their installation and equipment against these damaging overvoltages

Selection Criteria

Surge protection devices are classified according to their functions:

Type 1
SPD which can discharge partial lightning current with a typical waveform 10/350 μs. Usually employs spark gap technology.This, if required, will be installed in the primary distribution board at the origin of the electrical installation. A Type 1 SPD does not in itself offer the required protection level and must be used in conjunction with coordinated type 2 devices. An installation with a lightning protection system will require a Type 1 SPD.

Type 2
SPD which can prevent the spread of overvoltages in the electrical installations and protects equipment connected to it. It usually employs metal oxide varistor (MOV) technology and is characterised by an 8/20 μs current wave.This device would normally be in sub-distribution boards and in the primary distribution board if there was no requirement for a type 1 device

Type 3
These SPDs have a low discharge capacity. They must therefore only be installed as a supplement to Type 2 SPD and in the vicinity of sensitive loads. Type 3 SPD’s are characterised by a combination of voltage waves (1.2/50 μs) and current waves (8/20 μs).

Terminology

Iimp – Impulse current of 10/350 μs waveform associated with Type 1 SPD’s
In – Surge current of 8/20 μs waveform associated with Type 2 SPD’s
Up - The residual voltage that is measured across the terminal of the SPD when In is applied
Uc - The maximum voltage which may be continuously applied to the SPD without it conducting.

Surge Protection At a Glance

Maintenance

Most SPDs have an indication window that they are operational. If the indicator is green they are providing protection. If they are red then they have reached ‘end of life’ and will need replacing. Often there is a replaceable cartridge which can simply be withdrawn and replaced with a new operational device.

Available Products

Surge Protection Devices

Devices

Cat Ref.
Description
SPD 4P monobloc 12.5kA class 1 with light indicator TT + TNS
SPD 2P pluggable 15kA class 2 with end of life indicator
SPD 2P pluggable 15kA class 2 with reserve + remote contact
SPD 4P pluggable 15kA class 2 with end of life indicator
SPD 4P pluggable 15kA class 2 with reserve + remote contact
SPD 4P pluggable 40kA class 2 with end of life indicator
SPD 4P pluggable 40kA class 2 with reserve + remote contact
SPD 4P pluggable 100kA class 1 with end of life indicator TNS
SPD 4P pluggable 100kA class 1 with end of life indicator and remote contact TNS
SPD 4P pluggable 100kA class 1 with end of life indicator TT
SPD 4P pluggable 100kA class 1 with end of life indicator and remote contact TT
SPD pluggable photovoltaic 25kA class 2

Surge Protection Boards

Design 10 Surface

Part NumberDescription
Switch Disconnector
 
VML10810SPD
Dual Row, 8+10 Way 100A Sw Type 2 SPD
VML108SPD
8 Way 100A Switch Type 2 SPD
VML11214SPD
Dual Row, 12 + 14 way 100A SW SPD
VML112SPD
12 Way 100A Switch Type 2 SPD
VML11820SPD
Design 10, 18+20 way 100A SW SPD
VML118SPD
Design 10, 18 way 100A SW SPD
 
 
100 A High Integrity
 
VML90610CUSPD
6+10 HI 100A Sw 2*100A 30mA RCCB SPD
VML908CUSPD
8w Conf HI 100A Sw 2*100A 30mA RCCB SPD
VML91014CUSPD
10+14 HI 100A Sw 2*100A 30mA RCCB SPD
VML910TGSPD
10w 100A 100mA TD RCCB +100A 30mA SPD
VML914CUSPD
14w Conf HI 100A Sw 2*100A 30mA RCCB SPD
VML91620CUSPD
16+20 HI 100A Sw 2*100A 30mA RCCB SPD
 
 
100 A Time Delayed
 
VML910CUSPD
10w Conf HI 100A Sw 2*100A 30mA SPD
VML955TGSPD
10 Way 100A 100mA TD + 2 x 100A RCCB SPD
 
 
63 A High Integrity
 
VML60610CUSPD
6+10w HI 63A Sw 2*63A 30mA RCCB SPD
VML608CUSPD
8w Conf HI 63A Sw 2*63A 30mA RCCB SPD
VML61014CUSPD
Dual Row, 10+14 63A Sw 2*63A RCCB SPD
VML610CUSPD
10w Conf HI 63A Sw 2*63A 30mA RCCB SPD
VML614CUSPD
14w Conf HI 63A Sw 2*63A 30mA RCCB SPD
VML61620CUSPD
15+20w HI 63A Sw 2*63A 30mA RCCB SPD

Design 10 Flush

Part NumberDescription
Switch Disconnector
 
VMLF112SPD
12 Way 100A Switch SPD Flush
VMLF118SPD
Design 10, 18 way 100A SW SPD
 
 
100 A High Integrity
 
VMLF908CUSPD
8 Way HI 100A Sw 2*100A 30mA RCCB SPD
VMLF910CUSPD
10 Way HI 100A Sw 2*100A 30mA RCCB SPD
VMLF914CUSPD
14 Way HI 100A Sw 2*100A 30mA RCCB SPD
 
 
63 A High Integrity
 
VMLF608CUSPD
8w HI 63A Sw 2*63A 30mA RCCB SPD
VMLF610CUSPD
10w HI 63A Sw 2*63A 30mA RCCB SPD
VMLF614CUSPD
14w HI 63A Sw 2*63A 30mA RCCB SPD

Design 30

Part Number
(without knockouts)
Part Number
(with knockouts)
Description
Switch Disconnector
 
 
VM10810SPD
VM10810KSPD
Dual Row, 8 + 10 way 100A SW SPD
VM108SPD
VM108KSPD
8 way 100A Switch Type 2 SPD
VM11214SPD
VM11214KSPD
Dual Row, 12 + 14 way 100A SW SPD
VM112SPD
VM112KSPD
Design 30, 12 way 100A SW SPD
VM11820SPD
VM11820KSPD
Design 30,18+20 way 100A SW SPD
VM118SPD
VM118KSPD
Design 30, 18 way 100A SW SP
 
 
 
100 A High Integrity
 
 
VM90610CUSPD
VM90610CUKSPD
6+10w HI 100A Sw 2*100A 30mA RCCB SPD
VM908CUSPD
VM908CUKSPD
8w Conf HI 100A Sw 2*100A 30mA RCCB SPD
VM91014CUSPD
VM91014CUKSPD
10+14 HI 100A Sw 2*100A 30mA RCCB SPD
VM910CUSPD
VM910CUKSPD
10w Conf HI 100A Sw 2*100A 30mA RCCB SPD
VM914CUSPD
VM914CUKSPD
14w Conf HI 100A Sw 2*100A 30mA SPD
VM91620CUSPD
VM91620CUKSPD
15+20w HI 100A Sw 2*100A 30mA RCCB SPD
 
 
 
100 A Time Delayed
 
 
VM910TGSPD
VM910TGKSPD
10 Way 100A 100mA TD RCCB+100A 30mA+SPD
VM955TGSPD
VM955TGKSPD
10 Way 100A 100mA TD + 2 x 100A RCCB SPD
VM966TGSPD
VM966TGKSPD
10 Way 100A 100mA TD + 2 x 100A RCCB SPD
 
 
 
63 High Integrity
 
 
VM60610CUSPD
VM60610CUKSPD
6+10w HI 63A Sw 2*63A 30mA RCCB SPD
VM608CUSPD
VM608CUKSPD
8w Conf HI 63A Sw 2*63A 30mA RCCB SPD
VM61014CUSPD
VM61014CUKSPD
12+14w HI 63A Sw 2*63A 30mA RCCB SPD
VM610CUSPD
VM610CUKSPD
10w Conf HI 63A Sw 2*63A 30mA RCCB SPD
VM614CUSPD
VM614CUKSPD
14w Conf HI 63A Sw 2*63A 30mA RCCB SPD
VM61620CUSPD
VM61620CUKSPD
15+20w HI 63A Sw 2*63A 30mA RCCB SPD

Design 50

Part NumberDescription
Switch Disconnector
 
VSR112SPD
12 Way 100A Switch SPD Flush
VSR118SPD
Design 50, 18 way 100A SW SPD
 
 
100A High Integrity
 
VSR908CUSPD
8 Way HI 100A Sw 2*100A 30mA RCCB SPD
VSR910CUSPD
10 Way HI 100A Sw 2*100A 30mA RCCB SPD
VSR914CUSPD
14w HI 100A Sw 2*100A 30mA RCCB SPD
 
 
63 A High Integrity
 
VSR608CUSPD
8w HI 63A Sw 2*63A 30mA RCCB SPD
VSR610CUSPD
10w HI 63A Sw 2*63A 30mA RCCB SPD
VSR614CUSPD
14w HI 63A Sw 2*63A 30mA RCCB SPD
Author: Paul Collins
Posted: 7th March 2019
Get in contact: technical@hager.co.uk | Twitter