The PSR-28455-2 is a PolySwitch resettable fuse from Littelfuse, designed to provide overcurrent protection. This device utilizes Polymer Positive Temperature Coefficient (PPTC) technology to limit current during fault conditions and automatically reset once the fault is cleared.

Applications:

• USB Devices
• Portable Electronics
• Power Ports
• Automotive Applications
• Battery Chargers
• Game Consoles

Features:

• Resettable Functionality: Eliminates the need for fuse replacement, reducing maintenance.
• Solid State Design: Offers reliability and predictable performance.
• Fast Trip Time: Quickly responds to overcurrent events to protect circuitry.
• Low Resistance: Minimizes voltage drop and power dissipation during normal operation.
• Compact Form Factor: Allows for use in space-constrained applications.
• RoHS Compliant: Meets environmental standards.

Benefits:

• Improved Reliability: Protects circuits from damage due to overcurrents.
• Reduced Downtime: Eliminates the need to replace blown fuses.
• Lower Maintenance Costs: Resettable design reduces maintenance requirements.
• Enhanced Safety: Limits current during fault conditions.
• Simplified Design: Easy to integrate into a variety of applications.

Additional Details:

Specific electrical characteristics, such as hold current (Ih), trip current (It), and maximum voltage, vary depending on the specific model within the PSR-28455-2 series. Refer to the Littelfuse datasheet for detailed specifications. PPTC devices work by increasing resistance significantly during an overcurrent event. After the fault is removed and the device cools, the resistance returns to its normal level, allowing the circuit to resume operation. The PSR-28455-2 is a suitable choice for protecting various electronic devices and circuits from overcurrent conditions, providing a reliable and cost-effective solution.