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Overload Protection

Hager Product Solutions

Updated 30/10/2018

Design 10 100A (InA)

Part NumberDescription
Switch Disconnector
 
VML106
6 Way 100A Sw Disconnector Incomer Metal
VML110
10 Way 100A Sw Disconnector Incomer Met
VML114
14 Way 100A Sw Disconnector Incomer Met
VML120
20 Way 100A Sw Disconnector Incomer Met
VML10606
Con.unit, D10, dual row, 6+6w,100A, sw disc.
VML11010
Con.unit, D10, dual row,10+10w, 100A,sw
VML11414
Con.unit, D10,dual row,14+14w,100A,sw
VML12020
Con.unit, D10,dual row, 20+20w, 100A,sw
 
 
RCCB Incomer
 
VML306AH
6 Way 100A 30mA Type A RCCB Incomer
VML310AH
10 Way 100A 30mA Type A RCCB Incomer
VML314AH
14 Way 100A 30mA Type ARCCB Incomer
 
 
Time Delayed
 
VML966TG
12 Way 100A 100mA TD + 2x100A RCCB
VML912TG
12 Way Conf 100A 100mA TD RCCB +100A 30m
 
 
Split Load
 
VML955H
10 Way 5+5 100A Sw 2x100A 30mA RCCB
VML966H
12 Way 6+6 100A Sw 2x100A 30mA RCCB
VML946H
Dual Row 4+6 Way 100A Sw 2x100A 30mA RCC
VML90810H
Dual Row 8+10W 100A Sw 2x100A 30mA RCCB
VML91214H
Dual Row 12+14W 100A Sw 2x100A 30mA RCCB
VML91820H
Dual Row 18+20W 100A Sw 2x100A 30mA RCCB
VML9662
14 Way 6+6+2 100A Sw 3x100A 30mA
VML955914H
Dual Tariff 5+5 +14 100A Sw 3x100A RCCB
 
 
Configurable
 
VML512AC
Con.unit, D10, 12w, 100Asw, 100A, 30mA Type A
VML910CU
10 Way HI Cf 100A Sw 2x100A 30mA RCCB
VML910C
10 Way Conf 100A Sw 2x100A 30mA RCCB
VML912C
12 Way Conf 100A Sw 2x100A 30mA RCCB Met
VML912CU
12 Way HI Cf 100A Sw 2x100A 30mA RCCB Me
VML916CU
16 Way HI Cf 100A Sw 2x100A 30mA RCCB
VML916C
16 Way Conf 100A Sw 2x100A 30mA RCCB Met
VML916CURK
16 Way HI Cf 100A Sw 2x100A 30mA Round K
VML90810CU
Dual Row HI Conf 8+10 Way 100A Sw 2x100A
VML91214CU
Dual Row HI Conf 12+14 Way 100A Sw 2x100
VML91820CU
Dual Row HI Conf 18+20 Way 100A Sw 2x100
 
 
Multi Tarriff
 
VML9651
12 Way Multi Tariff 6+5+1 2x100A 1x63A
VML918C
18 Way Twin Tariff Conf 2x100A Sw Met

Design 30 100A (InA)

Part Number (without knockouts) Part Number (with knockouts)Description
 
 
 
Switch Disconnector
 
 
VM106
VM106K
6 Way 100A Sw Disconnector Incomer Met
VM110
VM110K
10 Way 100A Sw Disconnector Incomer Met
VM114
VM114K
14 Way 100A Sw Disconnector Incomer Met
VM116
VM116K
16 Way 100A Sw Disconnector Incomer Met
VM120
VM120K
20 Way 100A Sw Disconnector Incomer Met
VM10606
VM10606K
Con.unit, D30, dual row, 6+6w, 100A, sw disc.
VM11010
VM11010K
Con.unit, D30, dual row,10+10w,sw disc.
VM11414
VM11414K
Con.unit, D30, dual row,14+14w,sw disc.
VM12020
VM12020K
Con.unit, D30, dual row, 20+20w,sw disc.
 
 
 
RCCB Incomer
 
 
VM306AH
VM306AHK
Con.unit, D30, 6w, 100A, 30mA type A RCCB
VM310AH
VM310AHK
10 Way 100A 30mA Type A RCCB Incomer
VM314AH
VM314AHK
14 Way 100A 30mA Type A RCCB Incomer
 
 
 
Time Delayed
 
 
VM966TG
VM966TGK
12 Way 100A 100mA TD + 2x100A RCCB
VM912TG
VM912TGK
12 Way Conf 100A 100mA TD RCCB+100A 30mA
 
 
 
Split Load
 
 
VM955H
VM955HK
10 Way 5+5 100A Sw 2x100A 30mA RCCB
VM966H
VM966HK
12 Way 6+6 100A Sw 2x100A 30mA RCCB
VM946H
VM946HK
Dual Row 4+6 Way 100A Sw 2x100A 30mA RCC
VM90810H
VM90810HK
Dual Row 8+10W 100A Sw 2x100A 30mA RCCB
VM91214H
VM91214HK
Dual Row 12+14W 100A Sw 2x100A 30mA RCCB
VM91820H
VM91820HK
Dual Row 18+20W 100A Sw 2x100A 30mA RCCB
 
 
 
Configurable
 
 
VM910CU
VM910CUK
10 Way HI Cf 100A Sw 2x100A 30mA RCCB
VM912CU
VM912CUK
12 Way HI Cf 100A Sw 2x100A 30mA RCCB
VM916CU
VM916CUK
16 Way HI Cf 100A Sw 2 x100A 30mA RCCB
VM90810CU
VM90810CUK
Dual Row HI Conf 8+10 Way 100A Sw 2x100A
VM91214CU
VM91214CUK
Dual Row HI Conf 12+14 Way 100A Sw 2x100
VM91820CU
VM91820CUK
Dual Row HI Cf 18+20 Way 100A Sw 2x100A
 
 
 
Multi Tariff
 
 
VM9651
VM9651K
12 Way Multi Tar 6+5+1 2x100A 1*63A Met
VM918C
VM918CK
18 Way Twin Tariff Configurable 2x100A Switch

Design 50 100A (InA)

Part NumberDescription
Switch Disconnector
 
VSR110
10 Way Flush 100A Sw Disconnector Incomer Met
VSR114
14 Way Flush 100A Sw Disconnector Incomer Met
VSR120
20 Way Flush 100A Sw Disconnector Incomer Met
 
 
Configurable with Surge Protection
 
VSR910CU
10Way,Hi Integ,100A Sw,2x100A 30mA RCCB
VSR912CU
12Way,Hi Integ,100A Sw,2x100A 30mA RCCB
VSR916CU
16Way,Hi Integ,100A Sw,2x100A 30mA RCCB
 
 
Configurable with Surge Protection
 
VSR908CUSPD
8 Way HI 100A Sw 2x100A 30mA RCCB SPD
VSR910CUSPD
10 Way HI 100A Sw 2x100A 30mA RCCB SPD
VSR914CUSPD
14w HI 100A Sw 2x100A 30mA RCCB SPD

Design 10 Flush 100A (InA)

Part NumberDescription
Switch Disconnector
 
VMLF110
10 Way Flush 100A Sw Disconnector Incomer Met
VMLF114
14 Way Flush 100A Sw Disconnector Incomer Met
VMLF120
20 Way Flush 100A Sw Disconnector Incomer Met
 
 
Switch Disconnector with Surge Protection
 
VMLF112SPD
Design 10,12 way 100A SW SPD
VMLF118SPD
Design 10,18 way 100A SW SPD
 
 
Configurable
 
VMLF910CU
10 Way Flush 100A Sw 2x100A 30mA RCCB
VMLF912CU
12 Way HI Cf 100A Sw 2x100A 30mA RCCB
VMLF916CU
16 Way HI Cf 100A Sw 2x100A 30mA RCCB
 
 
Configurable with Surge Protection
 
VMLF908CUSPD
8 Way HI 100A Sw 2x100A 30mA RCCB SPD
VMLF910CUSPD
10 Way HI 100A Sw 2x100A 30mA RCCB SPD
VMLF914CUSPD
14 Way HI 100A Sw 2x100A 30mA RCCB SPD

Overload Protection White Paper

What the Regs Say

536.4.3.2
"RCCBs & switches do not provide protection against overload, therefore they shall be protected by an overcurrent protective device."

536.4.202
“ ... overload protection shall not solely be based on the use of diversity factors of the downstream circuits. To achieve overload protection of RCCBs or switches, the rated current of the overcurrent protection device (OCPD) shall be selected according to the manufacturers instructions”.

Overload Protection

Devices such as switches, RCCBs etc. in distribution boards and consumer units may have historically had their rated current determined after having taken diversity into account but without having considered overload protection of the devices.

These devices do not provide protection against overload and the 18th Edition prescribes that overload protection of the switch or RCCB shall not solely be based on the use of diversity factors of the downstream circuits.

Method of Protection

We recommend one of the following methods of protection against overload:

Method 1
Ensure the sum of the rated current of the downstream MCBs do not exceed the rated current of the switch or RCCB (Inc). This method would however need to consider the consequences of any spare ways and later additions.

Method 2
Ensure that the rated current of a switch or RCCB (Inc), stated by the assembly manufacturer, is not less than the rating of the upstream OCPD. For a domestic installation this could be a 100A cut-out fuse.

Method 3
Select a consumer unit or distribution assembly that only utilises RCBOs on outgoing circuits. Consideration will still need to be given as to the rated current of the main switch.

Example 1

Maximum demand based upon diversity = 92 A
(100% Largest load + 40% all other loads)
Consumer Unit InA = 100A

Example 2

Maximum demand based upon diversity = 62.4 A
(100% Largest load + 40% all other loads)
Consumer Unit InA = 63A

Example 3

Maximum demand based upon diversity = 98.4 A
(100% Largest load + 40% all other loads)
Consumer Unit InA = 100A

Hager Solutions

We feel the easiest and most flexible solution for installers is to utilise a consumer unit which is 100A rated (InA), with 100A (Inc) RCCBs fitted as standard, as shown below.

This enables the installer / designer to be confident that the consumer unit allows conformity to the overload protection requirement of RCCBs and switches regardless of the size of the upstream cut-out fuse fitted or the configuration of the downstream MCBs.

Solutions are available in single and dual row construction for;
-- Split Load
-- Configurable
-- High Integrity
-- Time Delayed Type S
-- RCCB Incomer



InA = Rated current of assembly (not necessarily the amps shown on the incoming device)
Inc = Rated current of a section within an assembly (not necessarily the amps shown on the specific device)