HVR250P145RBF

Series:	POLY-FUSE®, HVR250
Packaging:	Tape & Box (TB)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Type:	Polymeric
Voltage - Max:	60V (250V Int)
Current - Max:	3A
Current - Hold (Ih) (Max):	145mA
Current - Trip (It):	290mA
Time to Trip:	1s
Resistance - Initial (Ri) (Min):	4.5 Ohms
Resistance - Post Trip (R1) (Max):	6 Ohms
Operating Temperature:	-40°C ~ 85°C
Ratings:	--
Mounting Type:	Through Hole
Package / Case:	Radial, Disc
Size / Dimension:	0.268" Dia x 0.201" W (6.80mm x 5.10mm)
Height - Seated (Max):	0.492" (12.50mm)
Thickness (Max):	--
Lead Spacing:	0.217" (5.50mm)
Approvals:	--

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PTC Resettable Fuses
PTC resettable fuses are widely used in consumer and commercial devices for overcurrent protection. When an overload or short circuit occurs, these fuses reset after isolating the circuit, protecting the equipment from destructive currents. The HVR250P145RBF is one such self-resetting device. It is rated for 250A at 145V and features a low thermal impedance suitable for high current applications. In this article, we\'ll look at the application field and working principles of HVR250P145RBF.

Applications
HVR250P145RBF can be used in a wide range of applications such as automotive, power supplies, industrial equipment, and consumer electronics. It is suitable for applications such as solar array, motor control, and UPS. In automotive applications, HVR250P145RBF offers high surge current capability and short-circuit protection. Its fast reaction time prevents false tripping of the fuse. Owing to its high-current capabilities, it can be used in hot-swappable power supplies.In power supplies, HVR250P145RBF can be used to protect against overloads and thermal runaway. The device is resistant to harsh environments, making it suitable for outdoor applications. Additionally, it can be used to provide a low-impedance voltage source.In industrial equipment, the device can be used to protect against voltage spikes due to motor starting or external transients. It is also suitable for electronic equipment such as servers, computers, and power supplies.Apart from the above mentioned applications, HVR250P145RBF can be used in consumer electronics to protect against overloads and short circuits. It is highly reliable and easy to integrate into existing systems.

Working Principle
HVR250P145RBF consists of two parts: a positive temperature coefficient (PTC) element and an arc quenching material. The PTC element consists of resistive material which displays a positive temperature coefficient, meaning that its resistance increases with temperature. This material is sandwiched between two electrodes. When no current is flowing, the PTC element has a low resistance, allowing for a small current to flow. When the current exceeds the specified threshold, the PTC element starts to heat due to its positive temperature coefficient. This increases the resistances and reduces the current flow. The arc quenching material, present in the fuse, suppresses the arc by forming a solid product. This isolates the terminals and prevents any further current from flowing.When the current reduces to a safe level, the PTC element cools down, and the resistance lowers. This allows the current to flow again. The fuse can be repeatedly used to protect against overloads and short-circuits.

In conclusion, HVR250P145RBF is a PTC resettable fuse which is suitable for high-current applications. The device can be used in a wide range of applications, such as automotive, industrial, and consumer electronics. Its working principle involves a PTC element, which increases its resistance when the current exceeds a specified threshold, and an arc quenching material, which prevents any further current from passing. When the current reduces to a safe level, the fuse resets itself, allowing it to be used repeatedly.

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