B59965C0120A054

Resistance - 25°C (Typ):	1.2 Ohms
Approvals:	UR
Lead Spacing:	0.197" (5.00mm)
Thickness (Max):	--
Height - Seated (Max):	0.571" (14.50mm)
Size / Dimension:	0.433" Dia x 0.138" W (11.00mm x 3.50mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	AEC-Q200
Operating Temperature:	-40°C ~ 85°C
Series:	--
Current - Trip (It):	1.2A
Current - Hold (Ih) (Max):	600mA
Current - Max:	4.3A
Voltage - Max:	30V
Type:	Ceramic
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses

PTC Resettable Fuses, also called polyfuse, are a type of current-limiting fuses that can be reset after an overcurrent has occurred down the line. They accomplish this by using a polymer material to sense when an overload or short-circuit current is occurring, then interrupting the current flow by transitioning through a “high temperature” state that is capable of withstanding the increased current. For example, the B59965C0120A054 is a standard PTC Resettable Fuse that is rated for 1.2A and has a breakdown voltage of 250V.The primary application field for PTC Resettable Fuses are consumer electronics and power conversion applications such as battery protection, automotive circuits, and communication networks. In addition, they are used extensively in white goods, power supplies, electronic furniture, cable sensors, and many other industrial product designs.At its heart, PTC Resettable Fuses are designed to act as a switchable current limiter, able to protect circuits from destructive overcurrent events and auto-reset after the overload has been removed. By utilizing the properties of a polymer material, PTC fuses can quickly transition between an electrically conductive state and the high-temperature state that interrupts the current flow.PTC Resettable Fuses are a type of current-limiting device, meaning that they are able to regulate the amount of current allowed to travel through a line by saturating the core material during an overload or short-circuit event. This material saturation limits the amount of current able to pass through the fuse and interrupts the power flow long enough for the over-current event to be safely resolved.In normal operating conditions, the core of the PTC Resettable Fuse is in its low-resistance state capable of carrying current safely and efficiently. However, when an overload or short circuit event occurs, the core material melts, distorting its crystal structure and increases in resistance, thereby limiting the amount of current that can pass through and interrupting power flow. As the core cools, it is able to return to its low-resistance state and reset itself, and the device is able to continue to function normally.The B59965C0120A054 PTC Resettable Fuse possesses a number of characteristics that make it suitable for use in consumer electronics and power conversion applications. It is small in size and offers a maximum current of 1.2A and a maximum voltage of 250V, making it ideal for low-power applications. In addition, it has a rapid current trip response and is UL94V-0 certified, meaning that it meets safety requirements for flammability, making it suitable for use in a wide range of applications.Finally, PTC Resettable Fuses are strong and reliable, providing a cost-effective, compact solution that is easy to use and install. They offer the convenience of being able to reset themselves, which greatly reduces the time and cost associated with traditional fuse replacement. By utilizing the properties of a polymer material, they are able to quickly sense and respond to overcurrent events, providing valuable protection for both the circuit and the user.

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