SIST EN 60947-8:2003/A2:2012
(Amendment)Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines (IEC 60947-8:2003/A2:2011)
Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines (IEC 60947-8:2003/A2:2011)
Specifies rules for control units, which perform the switching functions in response to the thermal detectors incorporated in rotating electrical machines according to IEC 60034-11, and the industrial application. It specifies rules for that type of system comprising a positive temperature coefficient (PTC) thermistor detector having particular characteristics, and its associated control unit. The PT100 detectors are covered by IEC 60751, where the resistor values are given according to the temperatures of the detector. The present rules lay down the characteristics of association of this particular positive temperature coefficient thermistor detector and its associated control unit (designated "Mark A detector"" and "Mark A control unit""), when they are used in thermal protection systems. NOTE It is not possible to specify all the requirements for the operating characteristics of a control unit, as they are dependent on some aspects of the thermal detectors. Some aspects of the requirements of the thermal protector system can only be specified when account is taken of the characteristics of the rotating machine to be protected and the method of installation of the detector within the machine. For these reasons, for each characteristic it is necessary to specify who is responsible for stating the required values and who is responsible for compliance with the requirement and for carrying out any confirmatory test.
Niederspannungsschaltgeräte - Teil 8: Auslösegeräte für den eingebauten thermischen Schutz (PTC) von rotierenden elektrischen Maschinen (IEC 60947-8:2003/A2:2011)
Appareillage à basse tension - Partie 8: Unités de commande pour la protection thermique incorporée (CTP) aux machines électriques tournantes (CEI 60947-8:2003/A2:2011)
Nizkonapetostne stikalne naprave - 8. del: Krmilne enote za vgrajeno toplotno zaščito (PTC) rotacijskih električnih strojev (IEC 60947-8:2003/A2:2011)
Določa pravila za krmilne enote, ki opravljajo stikalne funkcije kot odziv na toplotne detektorje, vgrajene v rotacijske električne stroje v skladu s standardom IEC 60034-11, in industrijsko uporabo. Določa pravila za to vrsto sistema s termistorskim detektorjem s pozitivnim temperaturnim koeficientom (PTC) s posebnimi značilnostmi in z njim povezano krmilno enoto. Detektorji PT100 so zajeti v standardu IEC 60751, pri čemer so vrednosti upora podane v skladu s temperaturami detektorja. Ta pravila določajo značilnosti povezave tega termistorskega detektorja s pozitivnim temperaturnim koeficientom in z njim povezane krmilne enote (pri čemer sta označena kot »detektor z oznako A« in »krmilna enota z oznako A«), kadar se uporabljata v toplotnih zaščitnih sistemih. OPOMBA Vseh zahtev za obratovalne značilnosti krmilne enote ni mogoče določiti, saj so odvisne od nekaterih vidikov toplotnih detektorjev. Nekatere vidike zahtev toplotnega zaščitnega sistema je mogoče določiti le ob upoštevanju značilnosti rotacijskega stroja, ki bo zaščiten, in metode vgradnje detektorja v stroj. Zato je treba za vsako značilnost določiti, kdo je odgovoren za navedbo zahtevanih vrednosti, skladnost z zahtevo in izvedbo morebitnih potrditvenih preskusov.
General Information
Relations
Overview
SIST EN 60947-8:2003/A2:2012 is a European standard developed by CLC (European Committee for Electrotechnical Standardization), specifying requirements for low-voltage switchgear and controlgear, focusing on control units with built-in thermal protection (PTC) for rotating electrical machines. This amendment (A2) updates the base standard and aligns with the international IEC 60947-8:2003/A2:2011 standard. Its primary goal is to enhance safety, reliability, and electromagnetic compatibility (EMC) of control units designed to protect motors and rotating electrical machines from thermal overloads by use of positive temperature coefficient (PTC) thermistors.
This standard ensures that manufacturers and users comply with European safety directives and harmonize technical specifications across CENELEC member countries, facilitating market access and installation safety in industrial and commercial applications.
Key Topics
Thermal Protection Control Units: Defines specifications and performance criteria for control units integrated with PTC thermistors. These devices prevent damage by detecting thermal overloads in rotating electrical machines and triggering protective actions.
Low-Voltage Switchgear and Controlgear: Standard applies to low-voltage devices, ensuring safety and functional requirements are met within specified voltage limits (supporting compliance with the Low Voltage Directive - LVD 2006/95/EC).
Electromagnetic Compatibility (EMC): Establishes rigorous testing requirements for immunity to electrostatic discharges, radiated radio-frequency fields, electrical fast transients, surges, voltage dips, and interruptions to ensure device resilience in electrical environments.
Environmental and Safety Testing: Includes provisions for glow wire testing, flammability category adherence, vibration, shock, damp heat, cold, and salt mist tests to guarantee durability and operational reliability in challenging conditions.
Marking and Identification: Specifies proper labeling including "Mark A control unit," aiding in clear identification and traceability for quality assurance and regulatory compliance.
Relevant Normative References: Harmonizes with multiple IEC standards including IEC 60947-1 general rules, IEC 60034-11 for motor thermal protection, and IEC 61000 series for EMC testing methodology.
Applications
SIST EN 60947-8:2003/A2:2012 is critical for industries and engineers responsible for:
Rotating Electrical Machines: Ensures optimal thermal protection for motors used in industrial automation, manufacturing plants, HVAC systems, and pumps.
Motor Protection Relays and Controllers: Manufacturers designing control units with built-in PTC sensors to prevent overheating, extending motor life and reducing downtime.
Switchgear Assemblies: Integration of compliant control units within low-voltage switchgear panels, providing enhanced safety and fault detection mechanisms.
Compliance Verification: Testing laboratories validating thermal protection devices for EMC immunity, environmental resilience, and performance criteria according to European and international standards.
Safety and Maintenance: Enables maintenance teams to verify and replace control units meeting standard requirements, supporting preventive maintenance and electrical safety protocols.
Related Standards
SIST EN 60947-8:2003/A2:2012 references and aligns with several key standards enhancing its scope:
IEC 60947-1: General rules for low-voltage switchgear and controlgear, providing foundational requirements referenced in this part.
IEC 60034-11: Focused on thermal protection of rotating electrical machines, complementing the protective function of control units under this standard.
IEC 61000 series (4-2, 4-3, 4-4, 4-5, 4-6, 4-8, 4-11, 4-13): Cover electromagnetic compatibility testing methods assuring immunity to disturbances ensuring reliable operation.
IEC 60751: Specifications for platinum resistance thermometers, relevant for temperature measurement and sensor technologies related to thermal protection.
CISPR 11 and CISPR 22: Standards on radio-frequency disturbance characteristics, supporting compliance for electromagnetic emissions.
IEC 60068 series: Environmental testing standards for mechanical and climatic reliability (cold, vibration, shock, damp heat).
By aligning with these standards, SIST EN 60947-8:2003/A2:2012 provides a comprehensive technical framework ensuring the safety, robustness, and interoperability of thermal protection control units used in critical electrical equipment.
Keywords: EN 60947-8, low-voltage switchgear, controlgear, thermal protection, PTC thermistors, rotating electrical machines, EMC testing, motor protection, electrical standards, CENELEC, IEC 60947-8, electrical safety, industrial motors, control units.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2012
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Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal
protection (PTC) for rotating electrical machines (IEC 60947-8:2003/A2:2011)
Niederspannungsschaltgeräte - Teil 8: Auslösegeräte für den eingebauten thermischen
Schutz (PTC) von rotierenden elektrischen Maschinen (IEC 60947-8:2003/A2:2011)
Appareillage à basse tension - Partie 8: Unités de commande pour la protection
thermique incorporée (CTP) aux machines électriques tournantes (CEI 60947-
8:2003/A2:2011)
Ta slovenski standard je istoveten z: EN 60947-8:2003/A2:2012
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 60947-8/A2
NORME EUROPÉENNE
June 2012
EUROPÄISCHE NORM
ICS 29.130.20
English version
Low-voltage switchgear and controlgear -
Part 8: Control units for built-in thermal protection (PTC) for rotating
electrical machines
(IEC 60947-8:2003/A2:2011)
Appareillage à basse tension - Niederspannungsschaltgeräte -
Partie 8: Unités de commande pour la Teil 8: Auslösegeräte für den eingebauten
protection thermique incorporée (CTP) thermischen Schutz (PTC) von
aux machines électriques tournantes rotierenden elektrischen Maschinen
(CEI 60947-8:2003/A2:2011) (IEC 60947-8:2003/A2:2011)
This amendment A2 modifies the European Standard EN 60947-8:2003; it was approved by CENELEC on 2011-
06-22. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
the conditions for giving this amendment the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60947-8:2003/A2:2012 E
Foreword
The text of document 17B/1732/FDIS, future edition 1 of IEC 60947-8:2003/A2, prepared by SC 17B,
"Low-voltage switchgear and controlgear", of IEC TC 17, "Switchgear and controlgear" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN 60947-8:2003/A2:2012.
The following dates are fixed:
• latest date by which the document has
(dop) 2012-12-29
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2014-06-22
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed
for Use within Certain Voltage Limits (LVD - 2006/95/EC)
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
__________
Endorsement notice
The text of the International Standard IEC 60947-8:2003/A2:2011 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 60947-8:2003/A2:2012
Replace Annex ZA of EN 60947-8:2003/A1:2006 by:
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60034-11 2004 Rotating electrical machines - EN 60034-11 2004
Part 11: Thermal protection
IEC 60068-2-1 - Environmental testing - EN 60068-2-1 -
Part 2-1: Tests - Test A: Cold
1)
IEC 60068-2-6 1995 Environmental testing - EN 60068-2-6 1995
+ corr. March 1995 Part 2: Tests - Test Fc: Vibration (sinusoidal)
2)
IEC 60068-2-27 1987 Basic environmental testing procedures - EN 60068-2-27 1993
Part 2: Tests - Test Ea and guidance: Shock
IEC 60410 1973 Sampling plans and procedures for inspection - -
by attributes
3)
IEC 60738-1 1998 Thermistors - Directly heated positive step- EN 60738-1 1999
function temperature coefficient -
Part 1: Generic specification
4) 5)
IEC 60751 1983 Industrial platinum resistance thermometer EN 60751 1995
+ A1 1986 sensors - -
+ A2 1995 + A2 1995
IEC 60947-1 2007 Low-voltage switchgear and controlgear - EN 60947-1 2007
Part 1: General rules
IEC 60947-5-1 2003 Low-voltage switchgear and controlgear - EN 60947-5-1 2004
Part 5-1: Control circuit devices and switching + corr. July 2005
elements - Electromechanical control circuit
devices
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - EN 61000-4-2 2009
Part 4-2: Testing and measurement
techniques - Electrostatic discharge immunity
test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
+ A1 2007 Part 4-3: Testing and measurement + A1 2008
+ A2 2010 techniques - Radiated, radio-frequency, + A2 2010
electromagnetic field immunity test
1)
EN 60068-2-6 is superseded by EN 60068-2-6:2008, which is based on IEC 60068-2-6:2007.
2)
EN 60068-2-27 is superseded by EN 60068-2-27:2009, which is based on IEC 60068-2-27:2008.
3)
EN 60738-1 is superseded by EN 60738-1:2006, which is based on IEC 60738-1:2006.
4)
EN 60751 includes A1 to IEC 60751.
5)
EN 60751 is superseded by EN 60751:2008, which is based on IEC 60751:2008.
Publication Year Title EN/HD Year
IEC 61000-4-4 2004 Electromagnetic compatibility (EMC) - EN 61000-4-4 2004
+ A1 2010 Part 4-4: Testing and measurement + A1 2010
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-5 2005 Electromagnetic compatibility (EMC) - EN 61000-4-5 2006
+ corr. October 2009 Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61000-4-6 2008 Electromagnetic compatibility (EMC) - EN 61000-4-6 2009
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - EN 61000-4-8 2010
Part 4-8: Testing and measurement
techniques - Power frequency magnetic field
immunity test
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) - EN 61000-4-11 2004
Part 4-11: Testing and measurement
techniques - Voltage dips, short interruptions
and voltage variations immunity tests
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) - EN 61000-4-13 2002
+ A1 2009 Part 4-13: Testing and measurement + A1 2009
techniques - Harmonics and interharmonics
including mains signalling at a.c. power port,
low frequency immunity tests
IEC 60417 Graphical symbols for use on equipment - -
Data-
base
CISPR 11 (mod) 2009 Industrial, scientific and medical equipment - EN 55011 2009
+ A1 2010 Radio-frequency disturbance characteristics - + A1 2010
Limits and methods of measurement
CISPR 22 (mod) 2008 Information technology equipment - Radio EN 55022 2010
disturbance characteristics - Limits and
methods of measurement
- 5 - EN 60947-8:2003/A2:2012
Annex ZZ
(informative)
Coverage of Essential Requirements of EU Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Article 1 of Annex I of the Directive 2004/108/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directives concerned.
WARNING - Other requirements and other EU Directives may be applicable to the products falling within
the scope of this standard.
IEC 60947-8 ®
Edition 1.0 2011-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Low-voltage switchgear and controlgear –
Part 8: Control units for built-in thermal protection (PTC) for rotating electrical
machines
Appareillage à basse tension –
Partie 8: Unités de commande pour la protection thermique incorporée (CTP)
aux machines électriques tournantes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE PRICE COD
...
Frequently Asked Questions
SIST EN 60947-8:2003/A2:2012 is a amendment published by the Slovenian Institute for Standardization (SIST). Its full title is "Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines (IEC 60947-8:2003/A2:2011)". This standard covers: Specifies rules for control units, which perform the switching functions in response to the thermal detectors incorporated in rotating electrical machines according to IEC 60034-11, and the industrial application. It specifies rules for that type of system comprising a positive temperature coefficient (PTC) thermistor detector having particular characteristics, and its associated control unit. The PT100 detectors are covered by IEC 60751, where the resistor values are given according to the temperatures of the detector. The present rules lay down the characteristics of association of this particular positive temperature coefficient thermistor detector and its associated control unit (designated "Mark A detector"" and "Mark A control unit""), when they are used in thermal protection systems. NOTE It is not possible to specify all the requirements for the operating characteristics of a control unit, as they are dependent on some aspects of the thermal detectors. Some aspects of the requirements of the thermal protector system can only be specified when account is taken of the characteristics of the rotating machine to be protected and the method of installation of the detector within the machine. For these reasons, for each characteristic it is necessary to specify who is responsible for stating the required values and who is responsible for compliance with the requirement and for carrying out any confirmatory test.
Specifies rules for control units, which perform the switching functions in response to the thermal detectors incorporated in rotating electrical machines according to IEC 60034-11, and the industrial application. It specifies rules for that type of system comprising a positive temperature coefficient (PTC) thermistor detector having particular characteristics, and its associated control unit. The PT100 detectors are covered by IEC 60751, where the resistor values are given according to the temperatures of the detector. The present rules lay down the characteristics of association of this particular positive temperature coefficient thermistor detector and its associated control unit (designated "Mark A detector"" and "Mark A control unit""), when they are used in thermal protection systems. NOTE It is not possible to specify all the requirements for the operating characteristics of a control unit, as they are dependent on some aspects of the thermal detectors. Some aspects of the requirements of the thermal protector system can only be specified when account is taken of the characteristics of the rotating machine to be protected and the method of installation of the detector within the machine. For these reasons, for each characteristic it is necessary to specify who is responsible for stating the required values and who is responsible for compliance with the requirement and for carrying out any confirmatory test.
SIST EN 60947-8:2003/A2:2012 is classified under the following ICS (International Classification for Standards) categories: 29.130.20 - Low voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 60947-8:2003/A2:2012 has the following relationships with other standards: It is inter standard links to SIST EN IEC 60947-8:2023, SIST EN 60947-8:2003. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 60947-8:2003/A2:2012 is associated with the following European legislation: EU Directives/Regulations: 2004/108/EC, 2004/108/EU, 2006/95/EC, 2014/30/EU, 2014/35/EU; Standardization Mandates: M/404. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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