The R45106.3-6.3A is a resettable fuse from Littelfuse Inc. designed for overcurrent protection in electronic circuits. It's a Polymer Positive Temperature Coefficient (PPTC) device that automatically resets once the overcurrent condition is removed. The '6.3A' in the name indicates a hold current of 6.3 Amperes.

Applications

• Power Supplies: Used to protect power supplies from overload and short-circuit conditions.
• Battery Packs: Protects battery packs in portable electronic devices.
• USB Ports: Used to protect USB ports in computers and peripherals.
• Consumer Electronics: Provides overcurrent protection in various consumer electronics devices.
• Industrial Control Equipment: Protects sensitive circuits in industrial control systems.

Features

• Resettable: Automatically resets after the overcurrent condition is cleared, eliminating the need for fuse replacement.
• 6.3A Hold Current: Designed to carry a continuous current of 6.3 Amperes under normal operating conditions.
• Solid-State Construction: Provides enhanced reliability and durability.
• Fast Trip Time: Quickly trips in response to an overcurrent event.
• Compact Size: Allows for easy integration into various electronic designs.

Benefits

• Overcurrent Protection: Protects electronic circuits from damage due to excessive current.
• Reduced Downtime: Minimizes downtime by automatically resetting after a fault.
• Enhanced Reliability: Solid-state construction ensures long-term reliable operation.
• Cost-Effective: Reduces the cost associated with fuse replacement.
• Improved Safety: Helps to prevent fire hazards and other safety issues caused by overcurrent events.

Technical Specifications

For detailed technical specifications of the R45106.3-6.3A, including voltage rating, trip current, and operating temperature range, refer to the official Littelfuse datasheet. PPTC resettable fuses like the R45106.3-6.3A are made from a polymeric material with a positive temperature coefficient of resistance. During an overcurrent event, the material heats up, causing its resistance to increase significantly. This increase in resistance limits the current flow, protecting the circuit. When the overcurrent condition is removed, the device cools down, and the resistance returns to its normal low level, allowing the circuit to resume operation. Ensuring the correct voltage and trip current characteristics are selected is critical for effective overcurrent protection.