5HF 250

Introduction

Fuses are devices that are designed to provide electrical protection for motors, circuit breakers, transformers, capacitors, and other electrical appliances. They act as circuit breakers during overloads or short circuits, helping to prevent damage and potential injury to personnel. One of the most commonly used types of fuses is the 5HF 250 fuse, developed and manufactured by the world-renowned electronics group, ABB. This fuse is specially designed for medium-voltage applications and provides excellent overload protection in motor control circuits. In this article, we will discuss the 5HF 250 application field and working principle.

Application Field of the 5HF 250 Fuse

The 5HF 250 fuse is designed for medium-voltage applications and is rated for a maximum voltage of 690 VAC and 40 kA peak let-through current. This makes it suitable for use in motor control circuits that require medium-voltage ratings. The fuse is also UL and CSA-recognised, making it suitable for industrial and residential applications. Additionally, the 5HF 250 fuse is approved for use in hazardous environments and is suitable for use in outdoor applications.

Working Principle of the 5HF 250 Fuse

The 5HF 250 fuse is designed to provide reliable protection to the electrical appliances in which it is used. The fuse has a bimetallic strip that acts as a heat sensitive switch. When an overload or a short circuit occurs, the current causes the bimetallic strip to heat up. This leads to the strip expanding, which causes an internal switch in the fuse to open. This effectively cuts off the electricity supply to the circuit, thus preventing it from being damaged. The fuse can also be reset manually, if required.

Conclusion

The 5HF 250 is a medium-voltage fuse that has been designed for reliable electrical protection and has a range of applications. The fuse works on the principle of a bimetallic strip that is heat sensitive and triggers an internal switch when an overload or a short circuit occurs. The fuse is UL and CSA-recognised, making it suitable for industrial and residential applications, as well as hazardous environments and outdoor applications.