ISO 10924-3:2015 PDF

Road vehicles — Circuit breakers — Part 3: Miniature circuit breakers with tabs (Blade type), Form CB11

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Title (English):

ISO 10924-3:2015

Road vehicles — Circuit breakers — Part 3: Miniature circuit breakers with tabs (Blade type), Form CB11

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: April 2, 2015
Edition:: ISO IS 10924 edition 1 version 1
ICS:: 43.040.10

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Description (English):

ISO 10924-3:2015 specifies miniature circuit breakers with tabs (blade-type), Form CB11 for use in road vehicles. It establishes, for this circuit breaker form, the rated current, test procedures, performance requirements and dimensions. ISO 10924-3:2015 is intended to be used in conjunction with ISO 10924‑1 and with ISO 10924‑2. The numbering of its clauses corresponds to that of ISO 10924‑1 whose requirements are applicable, except where modified by requirements particular to this part of ISO 10924. ISO 10924-3:2015 is applicable to circuit breakers with a rated voltage of 14 V and/or 28 V, a current rating of ≤30 A and a breaking capacity of 2 000 A intended for use in road vehicles with a nominal voltage of 12 V and/or 24 V. The circuit breakers are different in dimensions and functions, such as electrically reset, automatic reset, manual reset, and switchable. NOTE This type of circuit breaker is intended to be used in similar applications as miniature fuse-links according to ISO 8820‑3. While the tab dimensions and current ratings can be the same, there might be differences in performance which the user of these products is advised to consider.

Technical details

Technical committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
SKU: ISO 10924-3:2015

Abstract

Overview

ISO 10924-3:2015 - Road vehicles - Circuit breakers - Part 3: Miniature circuit breakers with tabs (Blade type), Form CB11 - specifies performance, dimensions and test procedures for blade-type miniature circuit breakers used in road vehicles. It applies to breakers with rated voltages of 14 V and/or 28 V, current ratings up to 30 A, and an absolute breaking capacity of 2 000 A, intended for nominal 12 V and/or 24 V vehicle electrical systems. This part is to be used together with ISO 10924‑1 (definitions and general tests) and ISO 10924‑2 (user’s guide).

Key topics and technical requirements

Scope & form factor: Defines Form CB11 blade/tab miniature circuit breakers including electrically reset, automatic reset, manual reset and switchable variants.
Rated values: Rated voltage 14/28 V; current ratings ≤ 30 A; breaking capacity up to 2 000 A.
Dimensions & designation: Standardized tab dimensions and part designation examples for compatibility with blade-type fuse installations.
Test methods and sequence: Detailed test sequence plan covering:
- Voltage drop measurement (at 0.7·IR across tabs) and maximum permitted millivolt drops per rating.
- Operating time‑rating and time‑current characteristics at multiple test currents (e.g., 0.7 I R, 1.0 I R, 1.35 I R, 2.0 I R).
- Absolute and rated breaking capacity tests (tested at 2 000 A).
- Endurance, dielectric strength, terminal mechanical strength, and environmental tests (climatic, vibration, shock, free-fall, chemical).
Environmental class: Ambient temperature range −40 °C to 85 °C (Code G, per ISO 16750‑4).
Test cable sizes: Recommended test conductor cross-sections per rated current (e.g., 5 A → 0.5 mm², 30 A → 4.0 mm²) to ensure consistent comparative testing.

Practical applications and users

ISO 10924-3 is intended for:

Automotive OEMs specifying in-vehicle overcurrent protection for 12 V/24 V systems.
Component manufacturers designing and certifying blade-type miniature circuit breakers (Form CB11).
Supplier quality and test laboratories performing certification and comparative testing.
Electrical system engineers replacing or substituting miniature fuse-links (see ISO 8820‑3) with circuit breakers while assessing differences in performance. Use cases include protection of lighting, infotainment, sensors, body-control modules and other low-voltage vehicle circuits where compact, resettable protection is required.

Related standards

ISO 10924‑1: Definitions and general test requirements
ISO 10924‑2: User’s guide
ISO 8820‑3: Fuse-links with tabs (blade type)
ISO 6722‑1: Road vehicle single-core cable dimensions and tests
ISO 16750‑4: Environmental/climatic testing for vehicle electrical equipment

Keywords: ISO 10924-3:2015, miniature circuit breakers, Form CB11, blade type, road vehicles, automotive circuit breakers, rated current ≤30 A, 2 000 A breaking capacity, operating time tests, voltage drop, ISO 8820-3.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope & form factor: Defines Form CB11 blade/tab miniature circuit breakers including electrically reset, automatic reset, manual reset and switchable variants.
Rated values: Rated voltage 14/28 V; current ratings ≤ 30 A; breaking capacity up to 2 000 A.
Dimensions & designation: Standardized tab dimensions and part designation examples for compatibility with blade-type fuse installations.
Test methods and sequence: Detailed test sequence plan covering:
- Voltage drop measurement (at 0.7·IR across tabs) and maximum permitted millivolt drops per rating.
- Operating time‑rating and time‑current characteristics at multiple test currents (e.g., 0.7 I R, 1.0 I R, 1.35 I R, 2.0 I R).
- Absolute and rated breaking capacity tests (tested at 2 000 A).
- Endurance, dielectric strength, terminal mechanical strength, and environmental tests (climatic, vibration, shock, free-fall, chemical).
Environmental class: Ambient temperature range −40 °C to 85 °C (Code G, per ISO 16750‑4).
Test cable sizes: Recommended test conductor cross-sections per rated current (e.g., 5 A → 0.5 mm², 30 A → 4.0 mm²) to ensure consistent comparative testing.

Practical applications and users

ISO 10924-3 is intended for:

Automotive OEMs specifying in-vehicle overcurrent protection for 12 V/24 V systems.
Component manufacturers designing and certifying blade-type miniature circuit breakers (Form CB11).
Supplier quality and test laboratories performing certification and comparative testing.
Electrical system engineers replacing or substituting miniature fuse-links (see ISO 8820‑3) with circuit breakers while assessing differences in performance. Use cases include protection of lighting, infotainment, sensors, body-control modules and other low-voltage vehicle circuits where compact, resettable protection is required.

Related standards

ISO 10924‑1: Definitions and general test requirements
ISO 10924‑2: User’s guide
ISO 8820‑3: Fuse-links with tabs (blade type)
ISO 6722‑1: Road vehicle single-core cable dimensions and tests
ISO 16750‑4: Environmental/climatic testing for vehicle electrical equipment

ISO 10924-3:2015 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

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