BS IEC 60898-3:2019+A1:2022:2023 Edition

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Electrical accessories. Circuit-breakers for overcurrent protection for household and similar installations – Circuit-breakers for DC operation

Published By	Publication Date	Number of Pages
BSI	2023	144

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Categories: 29.120.50 - Fuses and other overcurrent protection devices, BSI

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PDF Pages	PDF Title
2	undefined
4	Blank Page
5	CONTENTS
12	FOREWORD
14	1 Scope
15	2 Normative references 3 Terms and definitions
16	3.1 Devices 3.2 General terms
18	3.3 Constructional elements
21	3.4 Conditions of operation
22	3.5 Characteristic quantities
26	3.6 Definitions related to insulation co-ordination
28	4 Classification 4.1 General 4.2 According to the number of poles 4.3 According to the current direction through the poles
29	4.4 According to the protection against external influences 4.5 According to the method of mounting 4.6 According to the methods of connection 4.6.1 According to the fixation system 4.6.2 According to the type of terminals 4.7 According to the instantaneous tripping current (see 3.5.18) 5 Characteristics of circuit-breakers 5.1 List of characteristics
30	5.2 Rated quantities 5.2.1 Rated voltages 5.2.2 Rated direct current (In) 5.2.3 Rated short-circuit capacity (Icn) 5.2.4 Rated making and breaking capacity of an individual pole (Icn1)
31	5.3 Standard and preferred values 5.3.1 Preferred values of rated voltage 5.3.2 Preferred values of rated current 5.3.3 Values of rated short-circuit capacity 5.3.4 Standard ranges of instantaneous tripping 5.3.5 Standard value of rated impulse withstand voltage (Uimp) Tables Table 1 – Preferred values of rated voltage and corresponding supply systems Table 2 – Ranges of instantaneous tripping
32	6 Marking and other product information
33	7 Standard conditions for operation in service 7.1 General 7.2 Ambient air temperature range
34	7.3 Altitude 7.4 Atmospheric conditions 7.5 Conditions of installation 7.6 Pollution degree 8 Requirements for construction and operation 8.1 Mechanical design 8.1.1 General 8.1.2 Mechanism
36	8.1.3 Clearances and creepage distances (see Annex A)
37	Table 3 – Minimum clearances and creepage distances
38	8.1.4 Screws, current-carrying parts and connections
39	8.1.5 Terminals for external conductors
40	Table 4 – Connectable cross-sections of copper conductors for screw-type terminals
41	8.1.6 Non-interchangeability
42	8.1.7 Mechanical mounting of plug-in type circuit-breakers 8.2 Protection against electric shock 8.3 Dielectric properties and isolating capability 8.3.1 General
43	8.3.2 Dielectric properties 8.3.3 Isolating capability 8.3.4 Dielectric strength at rated impulse withstand voltage (Uimp) 8.4 Temperature rise 8.4.1 Temperature rise limits 8.4.2 Ambient air temperature Table 5 – Temperature rise values
44	8.5 Uninterrupted duty 8.6 Automatic operation 8.6.1 Standard time-current zone Table 6 – Time-current operating characteristics
45	8.6.2 Conventional quantities 8.6.3 Tripping characteristic 8.7 Mechanical and electrical endurance
46	8.8 Performance at short-circuit currents and at small DC currents 8.9 Resistance to mechanical shock and impact 8.10 Resistance to heat 8.11 Resistance to abnormal heat and to fire 8.12 Resistance to rusting 8.13 Behaviour in case of making inrush current 8.14 Power loss
47	8.15 Requirement of small DC currents 9 Tests 9.1 Type tests and test sequences Table 7 – Maximum power loss per pole Table 8 – List of type tests
48	9.2 Test conditions
49	9.3 Test of indelibility of marking 9.4 Test of reliability of screws, current-carrying parts and connections Table 9 – Cross-sectional areas (S) of test copper conductorscorresponding to the rated currents
50	9.5 Tests of reliability of screw-type terminals for external copper conductors Table 10 – Screw thread diameters and applied torques
51	Table 11 – Pulling forces
52	9.6 Test of protection against electric shock 9.7 Test of dielectric properties 9.7.1 Resistance to humidity
53	9.7.2 Insulation resistance of the main circuit
54	9.7.3 Dielectric strength of the main circuit 9.7.4 Insulation resistance and dielectric strength of auxiliary circuits
55	9.7.5 Verification of impulse withstand voltages (across clearances and across solid insulation) and of leakage current across open contacts Table 12 – Test voltage of auxiliary circuits
57	Table 13 – Test voltage for verification of impulse withstand voltage Table 14 – Test voltage for verifying the suitability for isolation, referred tothe rated impulse withstand voltage of the circuit breakersand the altitude where the test is carried out
58	9.8 Test of temperature rise and measurement of power loss 9.8.1 Ambient air temperature 9.8.2 Test procedure 9.8.3 Measurement of the temperature of parts 9.8.4 Temperature rise of a part 9.8.5 Measurement of power loss
59	9.9 28-day test 9.10 Test of tripping characteristic 9.10.1 General 9.10.2 Test of time-current characteristic 9.10.3 Test of instantaneous tripping, of correct opening of the contacts and of the trip-free function
60	9.10.4 Test of effect of single-pole loading on the tripping characteristic of multipole circuit-breakers
61	9.10.5 Test of effect of ambient temperature on the tripping characteristic 9.11 Verification of mechanical and electrical endurance 9.11.1 General test conditions 9.11.2 Test procedure
62	9.11.3 Condition of the circuit-breaker after test 9.12 Short-circuit tests 9.12.1 General
63	9.12.2 Values of test quantities 9.12.3 Tolerances on test quantities 9.12.4 Test circuit for short-circuit performance Table 15 – Applicability of tests
64	9.12.5 Time constant of the test circuits
65	9.12.6 Measurement and verification of I2t and of the peak current (Ip) 9.12.7 Calibration of the test circuit 9.12.8 Interpretation of records 9.12.9 Condition of the circuit-breaker for test
67	9.12.10 Behaviour of the circuit-breaker during short-circuit tests 9.12.11 Test procedure
69	Table 16 – Ratio k between service short-circuit capacity (Ics) and rated short-circuit capacity (Icn)
70	9.12.12 Verification of the circuit breaker after short circuit tests
71	9.13 Mechanical stresses 9.13.1 Mechanical shock 9.13.2 Resistance to mechanical stresses and impact
74	9.14 Test of resistance to heat
75	9.15 Resistance to abnormal heat and to fire
76	9.16 Test of resistance to rusting 9.17 Verification of the behaviour in case of making inrush current 9.17.2 Values of the test quantities
77	9.17.3 Limit deviations of the test quantities 9.17.4 Test circuit for the determination of the withstand capacity against making currents
78	9.17.5 Testing for determination of the withstand capacity against making currents Figures Figure 1 – Thread forming tapping screw Figure 2 – Thread cutting tapping screw Figure 3 – Single-pole circuit-breaker or pole of multiple circuit breaker
79	Figure 4 – Two-pole circuit-breaker with two protected poles Figure 5 – Three-pole circuit-breaker with two protected polesand non-polarized protected M-pole
80	Figure 6 – Calibration of the test circuit in case of direct currents Figure 7 –Mechanical shock test apparatus (see 9.13.1)
81	Figure 8 – Standard test finger (see 9.6)
82	Figure 9 – Mechanical impact test apparatus (see 9.13.2)
83	Figure 10 – Striking element for pendulumfor mechanical impact test apparatus (see 9.13.2)
84	Figure 11 – Mounting support for mechanical impact test (see 9.13.2)
85	Figure 12 – Example of mounting for a rear fixed circuit-breakerfor mechanical impact test (see 9.13.2)
86	Figure 13 – Example of mounting of a panel board type circuit-breakerfor mechanical impact test (see 9.13.2)
87	Figure 14 – Application of force for mechanical test ona rail-mounted circuit-breaker (see 9.13.2.4) Figure 15 – Ball-pressure test apparatus
88	Figure 16 – Example of application of force for mechanical test ontwo-pole plug-in circuit-breaker, the holding in position of whichdepends solely on the plug-in connections (see 9.13.2.5)
89	Figure 17 – Diagrammatic representation (see 9.15) Figure 18 – Impedance Z1 for test circuit in Figures 3, 4 and 5for the simulation of making currents
90	Annex A (normative)Determination of clearances and creepage distances A.1 General A.2 Orientation and location of a creepage distance A.3 Creepage distances where more than one material is used A.4 Creepage distances split by floating conductive part A.5 Measurement of creepage distances and clearances
94	Figure A.1 – Examples of methods of measuring creepage distances and clearances
95	Annex B (normative)Test sequences and number of samples necessary to prove compliance with this document B.1 Test sequences Table B.1 – Test sequences
96	B.2 Number of samples to be submitted for full test procedure and acceptance criteria
97	B.3 Number of samples to be submitted for simplified test procedure Table B.2 – Number of samples for full test procedure
98	Table B.3 – Reduction of samples for series of circuit-breakers having different numbers of poles
99	Table B.4 – Test sequences for a series of circuit-breakersbeing of different instantaneous tripping classifications
100	Annex C (informative)Co-ordination under short-circuit conditions betweena circuit-breaker and another short-circuit protective device(SCPD) associated in the same circuit C.1 General C.2 Purpose
101	C.3 General requirements for the co-ordination of a circuit-breaker with another SCPD C.3.1 General consideration C.3.2 Take-over current C.3.3 Behaviour of C1 in association with another SCPD C.4 Type and characteristics of the associated SCPD
102	C.5 Verification of selectivity C.6 Verification of back-up protection C.6.1 Determination of the take-over current C.6.2 Verification of back-up protection
103	C.6.3 Tests for verification of back-up protection
104	C.6.4 Results to be obtained
105	Figure C.1 – Overcurrent co-ordination between a circuit-breaker anda fuse or back-up protection by a fuse – Operating characteristics
106	Figure C.2 – Total selectivity between two circuit-breakers
107	Figure C.3 – Back-up protection by a circuit-breaker – Operating characteristics
108	Annex D (informative)Examples of terminals Figure D.1 – Examples of pillar terminals
109	Figure D.2 – Examples of screw terminals and stud terminals
110	Figure D.3 – Examples of saddle terminals Figure D.4 – Examples of lug terminals
111	Annex E (informative)Correspondence between IEC and AWG copper conductors
112	Annex F (normative)Arrangement for short-circuit test
113	Figure F.1 – Test arrangement
114	Figure F.2 – Grid circuit Figure F.3 – Grid circuit
115	Annex G (normative)Routine tests G.1 General G.2 Tripping tests G.3 Verification of clearances between open contacts
116	Annex H (normative)Particular requirements for circuit-breakers withscrewless type terminals for external copper conductors H.1 Scope H.2 Normative references H.3 Terms and definitions
117	H.4 Classification H.5 Characteristics of circuit-breakers H.6 Marking and other product information H.7 Standard conditions for operation in service
118	H.8 Requirements for construction and operation H.8.1 Connection or disconnection of conductors H.8.2 Dimensions of connectable conductors Table H.1 – Connectable conductors
119	H.8.3 Connectable cross-sectional areas H.8.4 Insertion and disconnection of conductors H.8.5 Design and construction of terminals H.8.6 Resistance to ageing H.9 Tests H.9.1 Test of reliability of screwless terminals Table H.2 – Cross-sections of copper conductorsconnectable to screwless-type terminals
120	H.9.2 Tests of reliability of terminals for external conductors: mechanical strength Table H.3 – Pull forces
121	H.9.3 Cycling test Figure H.1 – Connecting samples
123	H.10 Reference documents Figure H.2 – Examples of screwless-type terminals
124	Annex I (normative)Particular requirements for circuit-breakerswith flat quick-connect terminations I.1 Scope I.2 Normative references I.3 Terms and definitions
125	I.4 Classification I.5 Characteristics of circuit-breakers I.6 Marking and other product information I.7 Standard conditions for operation in service I.8 Requirements for construction and operation I.8.1 Clearances and creepage distances (see Annex A) Table I.1 – Informative table on colour code of female connectorsin relationship with the cross section of the conductor
126	I.8.2 Terminals for external conductors I.9 Tests I.9.1 Mechanical overload-force Table I.2 – Overload test forces
127	Figure I.1 – Example of position of the thermocouple for measurement of the temperature rise Table I.3 – Dimensions of tabs
128	Figure I.2 – Dimensions of male tabs
129	Figure I.3 – Dimensions of round dimple detents (see Figure I.2) Figure I.4 – Dimensions of rectangular dimple detents (see Figure I.2) Figure I.5 – Dimensions of hole detents
130	Figure I.6 – Dimensions of female connectors Table I.4 – Dimensions of female connectors
131	Annex J (normative)Specific requirements for circuit-breakers with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductors J.1 Scope J.2 Normative references J.3 Terms and definitions
132	J.4 Classification J.5 Characteristics of circuit-breakers J.6 Marking and other product information J.7 Standard conditions for operation in service Table J.1 – Marking for terminals
133	J.8 Constructional requirements J.9 Tests Table J.2 – Connectable cross-sections of aluminium conductors for screw-type terminals
134	Table J.3 – List of tests according to the material of conductors and terminals Table J.4 – Connectable conductors and their theoretical diameters
135	J.9.1 Test conditions J.9.2 Current cycling test Table J.5 – Cross sections (S) of aluminium test conductorscorresponding to the rated currents
136	Table J.6 – Test conductor length Table J.7 – Equalizer and busbar dimensions
138	Table J.8 – Test current as a function of rated current Table J.9 – Example of calculation for determining the average temperature deviation D
139	Figure J.1 – General arrangement for the test Figure J.2
140	J.10 Reference documents Figure J.3 Figure J.4 Figure J.5 Figure J.6
141	Bibliography

Additional information

Status	Definitive
Pages	144
Publication Date	2023-01-24
ISBN	978 0 539 16879 2
Standard Number	BS IEC 60898-3:2019+A1:2022
Title	Electrical accessories. Circuit-breakers for overcurrent protection for household and similar installations – Circuit-breakers for DC operation
Identical National Standard Of	IEC 60898-3:2019/AMD1:2022
Descriptors	Grades (quality), Mechanical testing, Sampling methods, Overcurrent circuit-breakers, Circuits, Testing conditions, Electrical equipment, Rated voltage, Domestic electrical installations, Electrical testing, Switchgear, Electrical measurement, Overcurrent protection, Power losses, Miniature circuit-breakers, Circuit-breakers, Marking, Ratings, Electrical protection equipment, Short-circuit current tests, Test equipment, Household equipment, Rated current
Publisher	BSI
Committee	PEL/23/1
Amends	BS IEC 60898-3:2019
ICS Codes	29.120.50 - Fuses and other overcurrent protection devices

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