The 0679-9150-05 is a surface mount resettable fuse (PPTC) manufactured by Bel Fuse Inc. Also known as a Polymer PTC or Polyswitch, it's designed to protect electronic circuits from overcurrent conditions. Unlike traditional fuses that need replacement after blowing, resettable fuses return to a conductive state after the overcurrent condition is removed.

Applications:

• USB port protection
• HDMI port protection
• Power supplies
• Battery packs
• Game consoles
• General electronics circuit protection

Features:

• Surface Mount Device (SMD)
• Resettable – automatically returns to conductive state after fault removal
• Compact size
• Fast trip time
• Low resistance
• RoHS compliant

Benefits:

• Provides overcurrent protection without requiring fuse replacement.
• Reduces downtime and maintenance costs associated with replacing traditional fuses.
• Enhances product reliability and safety.
• Saves board space due to its small size.
• Complies with environmental regulations.
• Protects sensitive electronic components from damage.

Additional Details:

The 0679-9150-05 fuse operates based on the principle of positive temperature coefficient (PTC). Under normal operating conditions, the PPTC device has low resistance and allows current to flow through the circuit. When an overcurrent condition occurs, the PPTC device heats up rapidly, causing its resistance to increase dramatically. This high resistance limits the current flow, protecting the circuit from damage. Once the fault is removed and the PPTC device cools down, its resistance returns to its normal low level, allowing the circuit to resume operation.

Key specifications include its operating voltage, holding current (the maximum current it can carry without tripping), and trip current (the current at which it will trip). It’s important to select a resettable fuse with appropriate specifications to ensure optimal protection for the intended application. Its compact size and resettable feature make it a suitable choice for a variety of electronic devices where overcurrent protection is critical.