170M3689

170M3689 Application Field and Working Principle

Introduction

The 170M3689 is a high-performance, robust Type 2 Current Limiting Power Fuse used in a wide variety of electrical applications. It is designed to reduce or cut off current flow in the event of an over-current, while limiting the flow of current in the normal operation of the circuit. The fuse is rated at 750 volts AC (VAC) or 1000 volts DC (VDC), and a nominal operating current of 250 Amp (A).

Application Fields

The 170M3689 fuse is suitable for applications such as circuit protection for residential, commercial, and light industrial applications. It is commonly used in motor control centers, power supplies, compressors, HVAC systems, appliance controls, PLCs, and other low-voltage systems.

This fuse is also suitable for protecting power distribution systems, including disconnects, MCCs, switches, and related equipment. It can also be used in many other industrial power applications, such as switchgear, high-voltage power supplies, and transformers.

Working Principle

The working principle of the Type 2 Current Limiting Power Fuse is based on a card-type insulator that requires two main components. These two components are a heat-sensitive metallic conductor and a heat-triggering fuse.

The metallic conductor acts as a bridge or detector between the load and the fuse. When the load\'s current exceeds the normal operating current, the metallic conductor heats up and breaks. This breaks the electrical connection between the load and the fuse, thus tripping the fuse. The fuse, in turn, melts and releases the stored energy, which heats up the air gap between the contacts of the fuse.

The heated air gap causes an increase in current flow, the speed of which depends on the time-delay of the fuse. This helps to limit the destructive power of a high-voltage current by dissipating energy along the circuit. The cooling off of the heated air gap causes the current to drop and the fuse to disconnect the circuit breaker contacts, thereby preventing further damage to the load.

Advantages

The Type 2 Current Limiting Power Fuse provides consistent and reliable protection against over-currents. It is designed to prevent circuit damage from sudden current surges, by providing a rapid and reliable shut-off of electrons during an electrical fault. The fuse also offers superior thermal protection, limiting heat rise in the system and preventing damage to sensitive components.

The fuse is also easy to install, does not require additional isolating components and is compatible with a wide variety of power sources. Furthermore, the fuse is UL certified and CSA approved, providing assurance that it meets all the necessary safety requirements.

Conclusion

The 170M3689 Type 2 Current Limiting Power Fuse has many advantages, including reliable and consistent protection against over-currents, rapid and reliable shut-off of electrons during an electrical fault, superior thermal protection, easy installation and compatibility with a wide variety of power sources. It is also UL certified and CSA approved, providing assurance that it meets all the necessary safety requirements, making it an ideal choice for a variety of applications.