The RSTA5-02 is a resettable fuse, also known as a Polymer Positive Temperature Coefficient (PPTC) thermistor, manufactured by Bel Fuse Inc. It's designed to protect electronic circuits from overcurrent faults. Unlike traditional fuses that blow and need replacement, a resettable fuse limits current during a fault and then resets itself when the fault is removed. This makes it ideal for applications where continuous operation is critical.

Applications

• USB port protection
• Hard disk drives
• Solid state drives
• Battery packs
• Game consoles

Features

• Resettable overcurrent protection
• Fast trip time
• Low resistance
• Compact size
• Agency approvals (UL, CSA, TUV)

Benefits

• Eliminates the need to replace fuses
• Reduces downtime
• Improves system reliability
• Protects against damage from overcurrent faults
• Cost-effective solution

Additional Details

The RSTA5-02 has a hold current (Ihold) of 0.2A and a trip current (Itrip) typically around 0.4A. The maximum voltage rating is usually 30V. The trip time varies depending on the magnitude of the overcurrent, but it is generally within a few seconds. The device operates by increasing its resistance dramatically when the trip current is exceeded, limiting the current flow. Once the fault is removed and the device cools down, its resistance returns to a normal low value. This resettable functionality makes it a convenient and reliable solution for overcurrent protection in a wide range of electronic devices. The operating temperature range is typically between -40°C to +85°C.