International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 60255-151:2009
Title Measuring relays and protection equipment - Part 151: Functional requirements for over/under current protection
Project Number 21914
Abstract/Scope IEC 60255-151:2009 specifies minimum requirements for over/under current relays. It includes a specification of the protection function, measurement characteristics and time delay characteristics. Defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions.


Current Stage code 6060
Current Stage code date 2009-10-23
Current Stage code deadline 2010-06-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 95
Reference Document IEC 60255-151:2009 (EQV)
ICS 29.120.70 - Relays
Keywords Relay;Protection;Current;Over;Under
Note EN 60255-151:2009 and EN 60255-127:2014 supersede EN 60255-3:1998 + corr. Jan. 1998
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2009-10-23 2010-06-01 export to doc file  EN  FR  DE
5099 2009-09-01 2009-11-01  
5060 2009-08-17 2009-08-31 export to doc file  EN
5020 2009-06-12 2009-08-14  
3090 2009-03-27 2009-03-31  
5060 2008-11-17 2008-12-01 export to doc file  EN
5020 2008-06-13 2008-11-14  
1090 2008-06-10 2008-06-13  

Implementation Dates

date of Ratification (DOR) (1) 2009-09-01
date of Availability (DAV) (2) 2009-10-23
date of Announcement (DOA) (3) 2009-12-01
date of Publication (DOP) (4) 2010-06-01
date of Withdrawal (DOW) (5) 2012-09-01


Supersedes EN 60255-3:1998
EN 60255-3:1998/corrigendum Jan. 1998
Superseded by  
Normative reference (6) IEC 60050-447:2010
EN 60255-1:2010

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.