BSI PD IEC/TR 60269-5:2010
$198.66
Low-voltage fuses – Guidance for the application of low-voltage fuses
| Published By | Publication Date | Number of Pages |
| BSI | 2010 | 52 |
This technical report, which serves as an application guide for low-voltage fuses, shows how current-limiting fuses are easy to apply to protect today’s complex and sensitive electrical and electronic equipment. This guidance specifically covers low-voltage fuses up to 1 000 V a.c. and 1 500 V d.c. designed and manufactured in accordance with IEC 60269 series. This guidance provides important facts about as well as information on the application of fuses.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | English CONTENTS |
| 7 | FOREWORD |
| 9 | INTRODUCTION |
| 10 | 1 Scope 2 Normative references |
| 11 | 3 Terms and definitions |
| 12 | 4 Fuse benefits |
| 13 | 5 Fuse construction and operation 5.1 Components 5.2 Fuse-construction |
| 14 | Figures Figure 1 – Typical fuse-link according to IEC 60269-2 |
| 15 | Figure 2 – Typical fuse-link according to IEC 60269-2 |
| 16 | 5.3 Fuse operation Figure 3 – Current-limiting fuse operation |
| 17 | 6 Fuse-combination units Figure 4 – Fuse operation on overload |
| 18 | 7 Fuse selection and markings Tables Table 1 – Definitions and symbols of switches and fuse-combination units |
| 19 | Table 2 – Fuse application |
| 20 | 8 Conductor protection 8.1 General 8.2 Type gG Table 3 – Maximum operational voltage of fuse-links |
| 21 | 8.3 Types gN and gD 8.4 Types gR and gS 8.5 Protection against short-circuit current only |
| 22 | 9 Selectivity of protective devices 9.1 General Figure 5 – Selectivity – General network diagram |
| 23 | 9.2 Selectivity between fuses Figure 6 – Verification of selectivity between fuses F2 and F4 for operating time t ≥ 0,1 s |
| 24 | 9.3 Selectivity of circuit-breakers upstream of fuses Figure 7 – Verification of selectivity between circuit-breaker C2 and fuses F5 and F6 |
| 25 | 9.4 Selectivity of fuses upstream of circuit-breakers |
| 26 | Figure 8 – Verification of selectivity between fuse F2 and circuit-breaker C3 for operating time t ≥ 0,1 s |
| 27 | 10 Short-circuit damage protection 10.1 General 10.2 Short-circuit current paths Figure 9 – Verification of selectivity between fuse F2 and circuit-breaker C3 for operating time t < 0,1 s |
| 28 | 10.3 Current limitation 10.4 Rated conditional short-circuit current, rated breaking capacity 11 Protection of power factor correction capacitors |
| 29 | 12 Transformer protection 12.1 Distribution transformers with a high-voltage primary Table 4 – Fuse selection for power factor correction capacitors (fuses according to IEC 60269-2, system A) |
| 30 | 12.2 Distribution transformers with a low-voltage primary 12.3 Control circuit transformers 13 Motor circuit protection 13.1 General |
| 31 | 13.2 Fuse and motor-starter coordination 13.3 Criteria for coordination at the rated conditional short-circuit current Iq |
| 32 | 13.4 Criteria for coordination at the crossover current Ico Figure 10 – Fuse and motor-starter coordination |
| 33 | 13.5 Criteria for coordination at test current “r” 14 Circuit-breaker protection 15 Protection of semiconductor devices |
| 34 | 16 Fuses in enclosures 16.1 Limiting temperature of type gG fuse-links according to IEC 60269-2 – System A |
| 35 | 16.2 Other fuse-links 17 DC applications 17.1 Short-circuit protection 17.2 Overload protection Figure 11 – DC circuit |
| 36 | 17.3 Time-current characteristics Figure 12 – DC breaking operation Table 5 – Time constants of typical d.c. circuits |
| 37 | 18 Automatic disconnection for protection against electric shock for installations in buildings 18.1 General 18.2 Principle of the protection Figure 13 – Fuse operating time at various d.c. circuit time constants |
| 38 | Figure 14 – Time-current characteristic |
| 39 | 18.3 Examples |
| 40 | Annex A (informative) Coordination between fuses and contactors/motor-starters Table A.1 – Examples of typical fuse-link ratings used for motor-starter protection illustrating how the category of fuse-link can influence the optimum current rating |
| 41 | Figure A.1 – Collation of cut-off currents observed in successful coordination at Iq |
| 42 | Figure A.2 – Pre-arcing and operating I2t values of fuses used in successful coordination tests as a function of contactor rated current AC3 |
| 43 | Figure A.3 – Pre-arcing and operating I2t values of fuses used in successful coordination tests as a function of fuse rated current In |
| 45 | Table A.2 (Table 12 of IEC 60947-4-1) – Value of the prospective test current according to the rated operational current |
| 46 | Table A.3 – Types of coordination |
| 47 | Figure A.4 – Illustration of the method of selection of the maximum rated current of a fuse for back-up protection of a contactor of rating Ie = X amperes |
| 48 | Figure A.5 – Withstand capabilities of a range of contactors and associated overload relays at test current “r” |
| 49 | Figure A.6 – Illustration of a method of deriving curves of maximum peak current at test current “r” as a function of fuse rated current |
