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Is BS1361 type 1 or 2?


BS1361 is a British Standard that specifies the requirements for cartridge fuses used in electrical circuits. The standard is divided into two types: type 1 and type 2. This article aims to provide a thorough technical analysis of whether BS1361 should be classified as type 1 or type 2.

Type 1 Fuses

Type 1 fuses are designed to protect electrical circuits against short circuits only. They can quickly interrupt high-current faults, preventing damage to the circuit and potential hazards such as fire or electric shock. Type 1 fuses have a low breaking capacity, typically up to 16A, making them suitable for domestic applications where fault currents are relatively low.

Type 2 Fuses

Type 2 fuses, on the other hand, provide protection against both short circuits and overcurrent conditions. They have a higher breaking capacity, usually ranging from 25A to 100A, making them suitable for industrial and commercial applications. Type 2 fuses are commonly used in systems with higher fault currents, where protecting against overloads is crucial.


After careful analysis, it can be concluded that BS1361 should be classified as type 2. While type 1 fuses offer effective protection against short circuits, type 2 fuses provide additional protection against overcurrent conditions, which makes them more versatile and suitable for a wider range of applications. When selecting a fuse for an electrical circuit, understanding the specific requirements and fault currents is essential to ensure proper protection.

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