400E3C8.25

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Introduction

400E3C8.25 is a specialised fuse manufactured by Cooper Bussmann for use in electrical systems. Cooper Bussman is a leader in specialty fuses, surge protection devices, and thermal management products. All products adhere to rigid quality standards and are designed to meet current safety and electrical standards.

Application Fields

Cooper Bussman 400E3C8.25 fuses are widely used in a variety of applications, ranging from industrial settings to residential ones. Suitable fields of application include electric motors, control circuits, HVAC, elevators, transportation systems, medical devices, lighting systems, emergency lighting, and robots. Cooper Bussman 400E3C8.25 fuses are also suitable for voltage equalization and phased loads.

Working Principle

Fuses, such as Cooper Bussmann 400E3C8.25, are designed to respond to an overcurrent condition by opening the circuit and thus protecting the circuit from fire, damage or other hazards. The Cooper Bussmann 400E3C8.25 fuse is specially designed to respond to an overcurrent condition at a precise current rating. This can be considered as the fuse’s trip point or current threshold. When the current through the fuse is greater than the rated current, the fuse will open by contacts inside the fuse being blown apart due to high heat generated from the current. After opening the circuit, the fuse needs to be replaced. The Cooper Bussmann 400E3C8.25 fuse is also designed to be “time-delay” so it can allow small current transients and not open immediately.

The Cooper Bussmann 400E3C8.25 fuse operates in a similar manner to most other fuses in its class. The primary components of the fuse include a metal link which is the current carrying component as well as the primary component which initiates the opening of the fuse. An insert embedded within the fuse encloses the link and the primary components in a safe manner and helps to provide an appropriate level of mechanical support.

The metal link of the Cooper Bussmann 400E3C8.25 houses a small piece of specially calibrated material which provides a thermally-sensitive connection. When current flows through the link, heat is generated by the current, and this increases the temperature of the thermally-sensitive connection, eventually reaching a trip point where the connection breaks. When this occurs, the primary components contained within the fuse react in sequence causing the connectors to open and the current to stop flowing.

Conclusion

Cooper Bussmann 400E3C8.25 fuses are designed for applications in residential and industrial settings and are suitable for general AC, DC and Neutral circuits. They are designed as time-delay fuses, so they can handle normal large current transients without opening. This feature allows the fuse to respond rapidly to an overcurrent condition while also providing adequate protection to the circuit. The Cooper Bussmann 400E3C8.25 fuse operates in a similar manner to many other fuses, utilising a standard metal link and thermally-sensitive connection for a reliable trip at its rated current.

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