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SC 121A

Low-voltage switchgear and controlgear
 
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SC 121A Subcommittee(s) and/or Working Group(s)

Label
Title
Working Group
WG 1Insulation coordination
WG 2Contactors, starters and similar equipment
WG 3Control switches
WG 10Constructional requirements and environmental aspects
WG 17Product data and properties for information exchange
WG 19Internal arc-fault detection and combined mitigation devices
WG 21EMC, communication, safety and robustness aspects of electronics
Project Team
PT 60947-7-5Low-voltage switchgear and controlgear - Part 7-5: Ancillary equipment - Terminal blocks for aluminium conductors
PT 60947-10Low-voltage switchgear and controlgear - Part 10: Semiconductor circuit-breakers
Maintenance Teams
MT 5General rules
MT 6Switches, disconnectors and similar equipment
MT 8Terminal blocks and clamping units
MT 9Circuit-breakers
MT 18Transfer switching equipment (TSE)
MT 20Controllers for drivers of stationary fire pumps
Joint Working Groups
JWG 22Atmospheric and altitude correction Managed by TC 42
Advisory Groups
AG 4Advisory Group of SC 121A
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SC 121A Membership

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Country
Country Code
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P/O Status
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IEC Membership
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Argentina
AR
O-Member
Full Member
Australia
AU
P-Member
Full Member
Austria
AT
P-Member
Full Member
Belarus
BY
O-Member
Full Member
Belgium
BE
P-Member
Full Member
Brazil
BR
P-Member
Full Member
Bulgaria
BG
O-Member
Full Member
Canada
CA
P-Member
Full Member
China
CN
P-Member
Full Member
Croatia
HR
O-Member
Full Member
Czech Republic
CZ
P-Member
Full Member
Denmark
DK
P-Member
Full Member
Egypt
EG
P-Member
Full Member
Finland
FI
P-Member
Full Member
France
FR
P-Member
Full Member
Germany
DE
P-Member
Full Member
Greece
GR
O-Member
Full Member
Hungary
HU
O-Member
Full Member
India
IN
P-Member
Full Member
Indonesia
ID
P-Member
Full Member
Iran
IR
O-Member
Full Member
Ireland
IE
P-Member
Full Member
Israel
IL
P-Member
Full Member
Italy
IT
P-Member
Full Member
Japan
JP
P-Member
Full Member
Korea, Republic of
KR
P-Member
Full Member
Malaysia
MY
O-Member
Full Member
Mexico
MX
O-Member
Full Member
Netherlands
NL
P-Member
Full Member
New Zealand
NZ
O-Member
Full Member
Norway
NO
O-Member
Full Member
Oman
OM
O-Member
Full Member
Philippines, Rep. of the
PH
O-Member
Full Member
Poland
PL
P-Member
Full Member
Portugal
PT
P-Member
Full Member
Romania
RO
O-Member
Full Member
Russian Federation
RU
P-Member
Full Member
Saudi Arabia
SA
O-Member
Full Member
Serbia
RS
P-Member
Full Member
Singapore
SG
O-Member
Full Member
Slovakia
SK
O-Member
Full Member
Slovenia
SI
P-Member
Full Member
South Africa
ZA
P-Member
Full Member
Spain
ES
P-Member
Full Member
Sweden
SE
P-Member
Full Member
Switzerland
CH
P-Member
Full Member
Thailand
TH
O-Member
Full Member
Turkey
TR
O-Member
Full Member
Ukraine
UA
O-Member
Full Member
United Kingdom
GB
P-Member
Full Member
United States of America
US
P-Member
Full Member

Facts and figures

Secretariat
France
Participating countries
31
Observer Countries
20
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SC 121A Officers

Chair
Mr Andreas Bäumler (DE)
Term of office : 2026-08

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Secretary
Mr Michaël LAHEURTE (FR)

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IEC Central Office Contacts

Technical Officer
Mr Damien Lee

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Standards Project Administrator
Ms Amelyn Ching

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Editor
Ms Mélanie Ardiri

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SC 121A Liaisons

Committee
Description
Incoming liaison representative
Outgoing liaison representative
Internal IEC Liaison
TC 2Rotating machinery Mr Karl Hiereth
TC 3Documentation, graphical symbols and representations of technical information Mr Philippe JUHEL
SC 3CGraphical symbols for use on equipmentMr Yoshikazu Seki
SC 3DClasses, Properties and Identification of products - Common Data Dictionary (CDD)Mr Philippe JUHEL
 Mr Philippe JUHEL
TC 18Electrical installations of ships and of mobile and fixed offshore units Mr Ralf Hartkamp
SC 22GAdjustable speed electric power drive systems (PDS)  Mr Martial Patra
 Mr Philippe JUHEL
SC 22HUninterruptible power systems (UPS) Mr Heribert Schorn
TC 31Equipment for explosive atmospheresMr Otto Walch
 Mr Werner Böser
SC 32BLow-voltage fusesMr Michael Altenhuber
SC 32CMiniature fusesMr Dieter Seidl
SC 34CAuxiliaries for lamps Mr Werner Böser
TC 44Safety of machinery - Electrotechnical aspects Mr Philippe JUHEL
TC 64Electrical installations and protection against electric shock Mr Andreas Bäumler
Mr Stefano Tomasina
TC 65Industrial-process measurement, control and automationMr Joseph BRIANT
 Mr Andreas Bäumler
SC 65CIndustrial networks
SC 65EDevices and integration in enterprise systems Mr Andreas Bäumler
TC 77Electromagnetic compatibilityMr Bernd Jäkel
 Mr Andreas Bäumler
SC 77AEMC - Low frequency phenomena Mr Andreas Bäumler
TC 82Solar photovoltaic energy systemsMr Greg Ball
 Mr Thomas W. Mennell
TC 85Measuring equipment for electrical and electromagnetic quantities Mr Philippe JUHEL
TC 89Fire hazard testing
TC 94All-or-nothing electrical relaysMr John Kovacik
 Mr Karl Hiereth
TC 109Insulation co-ordination for low-voltage equipment Mr Heribert Schorn
TC 112Evaluation and qualification of electrical insulating materials and systems Mr Heribert Schorn
SC 121BLow-voltage switchgear and controlgear assemblies Mr Thomas W. Mennell
CIS/BInterference relating to industrial, scientific and medical radio-frequency apparatus, to other (heavy) industrial equipment, to overhead power lines, to high voltage equipment and to electric traction Mr Andreas Bäumler
SyC LVDCLow Voltage Direct Current and Low Voltage Direct Current for Electricity AccessMr Harry Stokman
ISO/IEC JTC 1/SC 27Information security, cybersecurity and privacy protection Mr Philippe JUHEL
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SC 121A Working Groups Liaisons

Working Groups
Description
Organization
Incoming liaison representative
Outgoing liaison representative
Liaison C
WG 17
Product data and properties for information exchange
 eClass e.V
Mr Philippe JUHEL