IEC 62019-2003 pdf – Electrical accessories – Circuit-breakers and similar equipment for household use – Auxiliary contact units.
1 Scope and object This International Standard applies to auxiliary electromechanical contact units associated (or intended to be associated) with circuit-breakers for overcurrent protection, and with residual current operated circuit-breakers with or without integral overcurrent protection for household and similar installations, having a rated voltage not exceeding 440 V a.c. and 250 V d.c., and a rated current not exceeding 10 A. NOTE 1 These requirements may also be used as guidance for auxiliary contacts units intended to be assembled with other switching devices for household and similar installations. NOTE 2 It is recommended that the advice of the manufacturer be sought concerning any application with low level energy appliances (low level values of current and/or voltage.) For low-energy contacts, specific recommendations are given in IEC 60947-5-4. The object of this standard is to state a) the characteristics of the auxiliary contact units; b) their electrical and mechanical requirements with respect to 1) the various duties to be performed; 2) the significance of the rated characteristics and of the markings; 3) the tests to verify the rated characteristics; c) the functional requirements to be satisfied by the auxiliary contact units with respect to 1) environmental conditions, including those of enclosed equipment; 2) dielectric properties; 3) terminals; 4) safety of use. 2 Normative references 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. IEC 60050(441):1984, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear, controlgear and fuses IEC 60065:1998, Audio, video and similar apparatus – Safety requirements
IEC 60249-2 (all specifications), Base materials for printed circuits – Part 2: Specifications IEC 60384-14:1993, Fixed capacitors for uses in electronic equipment – Part 14. Sectional specification: Fixed capacitors for electromagnetic interference suppression and connection to the supply mains IEC 60617 (all parts), Graphical symbols for diagrams IEC 60664-3:1992, Insulation coordination for equipment within low-voltage systems – Part 3: Use of coating to achieve insulation coordination of printed board assemblies IEC 60898:1995, Electrical accessories – Circuit-breakers for overcurrent protection for household and similar installations IEC 60998-2-2:1991, Connecting devices for low voltage circuits for household and similar purposes – Part 2-2: Particular requirements for connecting devices as separate entities with screwless-type clamping units IEC 60947-5-1:1997, Low-voltage switchgear and controlgear – Part 5: Control circuit devices and switching elements – Section one: Electromechanical control circuit devices IEC 60947-5-4:1996, Low-voltage switchgear and controlgear – Part 5: Control circuit devices and switching elements – Section 4: Methods of assessing the performance of low-energy contacts. Special tests IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) – Part 1: General rules IEC 61009-1:1996, Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) – Part 1: General rules IEC 61210:1993, Connecting devices – Flat quick-connect terminations for electrical copper conductors – Safety requirements ISO 306:1994, Plastics – Thermoplastic materials – Determination of Vicat softening temperature (VST)
3.3 contact element (of an auxiliary contact) all the structural parts, fixed and movable, conducting or insulating, of an auxiliary contact necessary to close and open one single current path of the auxiliary contact unit (IEV 441-15-23 modified) NOTE The contact element and the actuating system may form an indivisible unit, but frequently one or more contact elements may be combined with one or more actuating system(s). 3.4 mini-gap contact element contact element having a distance equal to, or higher than, 1,2 mm in the open position, but not in compliance with item 1 of table 2 3.5 normal gap contact element contact element having a distance complying with item 1 of table 2 in the open position 4 Classification Contact elements may be classified as follows. 4.1 According to the utilization categories (see table 1 of 5.4) 4.2 According to the electrical ratings based on utilization categories (see table 4) 4.3 According to one of the following constructions (see figure 1) 4.3.1 Form A – Single-gap make-contact element 4.3.2 Form B – Single-gap break-contact element 4.3.3 Form C – Single-gap make-break three terminal change-over contact element 4.3.4 Other types (see note 1) 4.4 According to the suitability for PELV and SELV circuits NOTE 1 Other types are described in figure 1. (See also clause 3 and figure 4 of IEC 60947-5-1). NOTE 2 Distinction is made between make before break (overlap) change-over contact elements where the two circuits are both closed for a part of the travel of the moving contacts from one position to the other, and break before make (non-overlap) change-over contact elements where the two circuits are both open for a part of the travel of the moving contacts from one position to the other. Unless otherwise stated, change-over contact elements are break before make.