This part of IEC 61051 is a sectional specification and is applicable to metal oxide varistors with symmetrical voltage-current characteristics for use in electronic equipment connected to any AC or DC supply system. These varistors are designed to protect electronic and other sensitive equipment from high transient surges. Varistors under the scope of this sectional specification are not intended to give primary protection against lightning surges. These varistors have metallic connections and are intended to be mounted as through hole component or directly on to printed boards. The object of this document is to prescribe preferred ratings and characteristics and to select from IEC 61051-1 the appropriate quality assessment procedures, tests and measuring methods, and to give general performance requirements for this type of varistors. Test severities and requirements prescribed in detail specifications referring to this sectional specification should be of equal or higher performance level, because lower performance levels are not permitted.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 3 Terms and definitions 4 Preferred characteristics 4.1 Climatic categories 4.2 Voltage ratings Tables Table 1 \u2013 Upper and lower category temperature and durationof the damp heat, steady state test <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Table 2 \u2013 Preferred voltage ratings for disk type varistors <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.3 Derating for metal oxide varistors 4.3.1 General 4.3.2 Derating at increased operating temperatures Table 3 \u2013 Preferred voltage ratings for SMD types <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4.3.3 Maximum peak current derating characteristic Figure 1 \u2013 Typical temperature derating curve for maximum continuous voltage,surge current, energy absorption and average power dissipation Figure 2 \u2013 Typical maximum peak current derating curve <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5 Test procedures, test severities and performance requirements 5.1 General 5.2 Visual examination and check of dimensions 5.3 Electrical tests 5.3.1 Varistor voltage 5.3.2 Leakage current 5.3.3 Capacitance 5.3.4 Voltage proof 5.3.5 Clamping voltage 5.3.6 Maximum peak current 5.3.7 Rated energy <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.4 Soldering test 5.4.1 Resistance to soldering heat 5.4.2 Solderability 5.5 Temperature and climate test 5.5.1 Damp heat, steady state 5.5.2 Endurance at upper category temperature 5.5.3 Rapid change of temperature 5.5.4 Climatic sequence 5.6 Robustness test 5.6.1 Robustness of terminations 5.6.2 Shock testing <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.6.3 Vibration 5.6.4 Solvent resistance of marking 5.7 Fire hazard (Needle flame test) 6 Marking, packaging and ordering information 7 Detail specifications 7.1 General 7.2 Outline drawing and dimensions <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 7.3 Mounting 7.4 Ratings and characteristics 7.5 Marking 7.6 Ordering information 8 Quality assessment procedure 8.1 General 8.2 Primary stage of manufacturer 8.3 Structurally similar components <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 8.4 Qualification approval (QA) 8.4.1 Qualification approval (QA) procedures 8.4.2 Fixed sample size procedure 8.4.3 Test schedule <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Table 4 \u2013 Test schedule for the qualification approval <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8.5 Quality conformance inspection 8.5.1 General 8.5.2 Formation of inspection lots 8.5.3 Test schedule 8.5.4 Assessment level <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table 5 \u2013 Test schedule for the qualification approval Table 6 \u2013 Periodic inspection <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Annex X (informative)Cross-references to the previous edition of this document Table X.1 \u2013 Cross-references <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Varistors for use in electronic equipment – Sectional specification for surge suppression varistors<\/b><\/p>\n |