170M4768 Application Field and Working Principle

170M4768 is a member of a series of dual element, time-delay (DETDD) fuses designed for heavy-duty applications to protect electrical systems and components from current overload and short circuit conditions. These fuses feature high interrupting ratings, low let-through current peaks, self-certifying ratings up to 600A, and an operating temperature range from -40C to 85C. The 170M4768, in particular, has an interrupt rating of 200kA at 600VAC/50VADC, and a range of Class J and Class R ratings.

Application Field

The 170M4768 fuse is designed for use in a variety of applications, including motor control, heating/ventilating/air conditioning, commercial and industrial distribution, lighting, power supplies, process control, uninterruptible power supplies (UPSs), and other critical applications. It is UL-listed and CSA-certified for 125VAC/ 250VAC applications.

Working Principle

The 170M4768 fuse works by interrupting the current flow in the system when it senses an overload or short circuit. This is done by an element, often made of metal, that melts when the current flow exceeds a set limit. The second element, an expulsion sleeve, forces the molten metal away from the fuse body, leaving an open circuit. The fuse is designed to continue drawing current, which reduces the size of the let-through current peak, allowing time for the overcurrent protection equipment (OCPD) or circuit breaker to recognize the fault and shut off the power.

Specifications

The 170M4768 fuse comes in 0.6A up to 600A sizes, offers UL and CSA certifications, and is suitable for 125VAC/ 250VAC applications. Other features and ratings include:

• 200kA interrupt rating at 600VAC/50VADC
• Class J or Class R ratings
• Operating temperature range of -40C to 85C
• Dual-element, time-delay (DETDD) construction
• Low let-through currents
• IP20 (finger-safe) design
• UL94V0 rated flame retardancy
• NEMA FL 1 enclosure rating

Conclusion

The 170M4768 fuse was designed for use in a variety of applications requiring heavy-duty overcurrent protection. It features an interrupt rating of 200kA at 600VAC/50VADC, Class J and Class R ratings, and a wide operating temperature range. The fuse is also UL-listed and CSA-certified for 125VAC/250VAC applications and is available in 0.6A up to 600A sizes.