The RXEF185/JK30-185 is a resettable fuse (also known as a polymeric positive temperature coefficient or PPTC device) manufactured by TE Connectivity. These devices are used to protect electronic circuits from overcurrent conditions. They function by increasing their resistance dramatically when the current exceeds a specified trip current, effectively limiting the current flow and protecting downstream components. Once the overcurrent condition is removed and the device cools down, it resets to a low resistance state, allowing normal operation to resume. The '185' in the name refers to the holding current.

Applications

• USB ports: Protects USB ports from overcurrent damage due to faulty devices or short circuits.
• Computer peripherals: Used in devices like keyboards, mice, and printers for overcurrent protection.
• Power supplies: Protects power supplies from overload conditions.
• Battery packs: Safeguards battery packs from overcurrent and short-circuit conditions.
• Automotive electronics: Protects automotive circuits from overcurrent events.

Features

• Resettable: Automatically resets after the overcurrent condition is removed.
• Solid-state: No moving parts, providing high reliability and long life.
• Compact size: Enables integration into space-constrained applications.
• Fast trip time: Quickly responds to overcurrent conditions.
• Low resistance: Minimizes voltage drop during normal operation.
• Agency approvals: Meets industry safety standards.

Benefits

• Overcurrent protection: Protects electronic circuits from damage due to overcurrent conditions.
• Improved system reliability: Reduces the risk of component failure due to overcurrent events.
• Reduced warranty costs: Minimizes the need for repairs or replacements due to overcurrent damage.
• Enhanced safety: Protects users from potential hazards associated with overcurrent conditions.
• Cost-effective solution: Provides a reliable and reusable overcurrent protection solution.

Additional Details

The RXEF185/JK30-185 has a hold current of 1.85A and a trip current that depends on the ambient temperature. It's a radial-leaded device. The operating temperature range typically spans from -40°C to +85°C. The device's resistance increases dramatically above its trip current, limiting the fault current. After the fault is cleared, the device cools down and resets to its low-resistance state. These resettable fuses are typically chosen based on the normal operating current of the circuit they are protecting. The RXEF series from TE Connectivity is a well-established line of PPTC resettable fuses. Selecting the appropriate resettable fuse is critical to properly protect circuits. It should be able to carry the normal operating current without tripping but should trip quickly under fault conditions.