The PSR-28299 is a series of high-performance, resettable fuses from Littelfuse. These Polymer PTC (Positive Temperature Coefficient) devices offer robust overcurrent protection for a wide range of applications. They are designed to limit dangerous currents during fault conditions and automatically reset once the fault is cleared and power is removed.

Applications:

• USB port protection
• Power supplies
• Automotive electronics
• Industrial control systems
• Battery packs
• Consumer electronics

Features:

• Resettable overcurrent protection: Eliminates the need for fuse replacement, reducing downtime and maintenance costs.
• Solid-state design: Provides reliable and predictable performance.
• Fast trip time: Quickly interrupts fault currents to protect sensitive circuits.
• Low resistance: Minimizes voltage drop and power dissipation during normal operation.
• Compact size: Allows for easy integration into space-constrained applications.
• RoHS compliant: Meets environmental regulations.

Benefits:

• Improved system reliability: Protects circuits from overcurrent damage, extending the life of equipment.
• Reduced downtime: Eliminates the need for fuse replacement, minimizing downtime.
• Lower maintenance costs: Resettable design reduces maintenance costs.
• Enhanced safety: Limits dangerous currents during fault conditions, improving safety.
• Simplified design: Easy to integrate into existing designs.

Additional Details:

The specific electrical characteristics of the PSR-28299 will vary depending on the exact model within the series. Parameters such as holding current (Ih), trip current (It), trip time, and maximum voltage rating will differ. Consult the Littelfuse datasheet for the specific PSR-28299 model being used to determine these values. These PTCs operate by increasing their resistance dramatically when subjected to an overcurrent condition. Once the fault is removed and the device cools down, its resistance returns to a low level, allowing normal operation to resume. The PSR-28299 series offers a reliable and cost-effective solution for overcurrent protection in a wide range of applications.