The R47301.5-T1 is a PolySwitch resettable fuse (PPTC) from Littelfuse. This device is designed to protect electronic circuits from overcurrent conditions. Unlike traditional fuses that must be replaced after they blow, a PolySwitch device resets itself once the overcurrent condition is removed, making it ideal for applications where access for fuse replacement is difficult or inconvenient.

Applications:

• USB port protection
• Hard drive protection
• Game console port protection
• General electronic equipment protection
• Power supply protection

Features:

• Hold Current: 1.5A
• Resettable overcurrent protection
• Fast trip time
• Low resistance
• Compact size

Benefits:

• Provides reliable overcurrent protection
• Eliminates the need for fuse replacement
• Reduces downtime and maintenance costs
• Improves product reliability
• Simplifies circuit design

Additional Details:

The R47301.5-T1 is a surface mount device (SMD) suitable for automated assembly. It operates by increasing its resistance dramatically when an overcurrent condition occurs, limiting the current flow and protecting the circuit. Once the overcurrent is removed and the device cools down, its resistance returns to a low value, allowing the circuit to resume normal operation. The “-T1” suffix likely refers to a specific packaging or termination style. Careful consideration should be given to the device's hold current, trip current, and operating temperature when selecting a PolySwitch for a particular application.