The R490.750-0.75A is a PTC (Positive Temperature Coefficient) resettable fuse manufactured by Littelfuse Inc. It is designed to protect electronic circuits from overcurrent conditions. Unlike traditional fuses, PTC resettable fuses can automatically reset after the overcurrent condition is removed, making them ideal for applications where service calls are costly or undesirable.

Applications

• USB Port Protection
• Power supplies
• Computer motherboards
• Game console port protection
• General electronics protection
• Automotive Applications

Features

• Resettable: Automatically resets after the overcurrent condition is removed.
• Fast trip time: Quickly responds to overcurrent events.
• Compact size: Allows for easy integration into space-constrained applications.
• Low resistance: Minimizes voltage drop during normal operation.
• Agency recognition: UL, CSA, and TUV approved.
• Maximum Voltage: 30V
• Hold Current: 0.75A
• Trip Current: 1.5A

Benefits

• Provides reliable overcurrent protection for electronic circuits.
• Eliminates the need for manual fuse replacement, reducing downtime and maintenance costs.
• Offers faster and more precise protection compared to traditional fuses.
• Reduces warranty costs by preventing damage to sensitive components.
• Improves safety by preventing overheating and potential fire hazards.

Additional Details

The R490.750-0.75A PTC resettable fuse operates based on the principle of positive temperature coefficient. When an overcurrent condition occurs, the resistance of the PTC material increases rapidly, limiting the current flow and protecting the circuit. Once the overcurrent condition is removed and the device cools down, the resistance returns to its normal low value, allowing the circuit to resume normal operation. This fuse is RoHS compliant, ensuring it is free from hazardous substances. It's vital to consult the datasheet for specific operating conditions and derating curves.