The R459.500 is a resettable fuse manufactured by Littelfuse Inc. It is a PolySwitch PPTC (polymeric positive temperature coefficient) device designed to protect electronic circuits from overcurrent faults. When an overcurrent condition occurs, the device's resistance rapidly increases, limiting the current flow and protecting the circuit. Once the fault is cleared and power is removed, the device cools down and automatically resets to its low-resistance state.

Applications

• USB Power Protection
• Game Consoles
• Mobile Phones and Smartphones
• Tablets and Laptops
• Point-of-Sale (POS) Equipment

Features

• Resettable Operation: Returns to a low-resistance state after an overcurrent event is removed.
• Solid-State Design: More reliable and durable than traditional fuses.
• Fast Trip Time: Quickly responds to overcurrent conditions.
• Low Profile: Ideal for space-constrained applications.
• RoHS Compliant: Environmentally friendly.

Benefits

• Enhanced Circuit Protection: Prevents damage from overcurrent conditions.
• Reduced Downtime: Eliminates the need for fuse replacement.
• Improved Reliability: Increases the lifespan of electronic products.
• Lower Maintenance Costs: Reduces the need for servicing and repairs.
• Enhanced Safety: Prevents overheating and potential fire hazards.

Additional Details

The R459.500 has a holding current of 0.5A (500mA), meaning it can continuously carry 0.5A without tripping. Its trip current, the current at which it will begin to trip, will be higher than 0.5A and will depend on factors like ambient temperature. The voltage rating is typically specified in the Littelfuse datasheet. It is crucial to consult the datasheet for detailed specifications, including trip time curves and temperature derating information, to ensure proper application and performance. These devices are constructed from a polymer composite material that changes its resistance significantly with temperature, allowing it to act as an automatically resettable fuse.