250R145-RAZR

Resistance - Initial (Ri) (Min):	3 Ohms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.433" (11.00mm)
Size / Dimension:	0.256" L x 0.181" W (6.50mm x 4.60mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	12 Ohms
Series:	POLY-FUSE®, 250R
Time to Trip:	2.5s
Current - Trip (It):	290mA
Current - Hold (Ih) (Max):	145mA
Current - Max:	3A
Voltage - Max:	60V (250V Int)
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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PTC Resettable FusesPTC resettable fuses are a unique form of fuses that are designed to reset themselves automatically after a power surge or a period of high currents passing through them. This set up helps protect the circuit from damage due to a power surge or other high electrical current, while also providing many of the same functions as regular fuses. PTC resettable fuses are also known as polyfuses and resettable thermal fuses.The typical function of a typical PTC resettable fuse is to detect when the circuit is drawing too much current, or when there is a power surge, then it trips a switch to cut the power until the current level or power surge has been stabilized. This helps prevent damage to the circuit, as well as preventing potential power outages. In most cases, the switch trips when the current draw exceeds the rated capacity of the fuse. The fuses are available in a variety of sizes, and normally have a maximum current rating anywhere from 0.25 to 250 amps.When a PTC resettable fuse trips, it is usually caused by a brief power surge or a high current draw by the circuit. In either case, it is important to reduce the current and reset the switch, as a prolonged high current draw can damage the circuit. Generally, when a voltage spike is detected, the fuse trips in order to protect the device it was intended to protect. This often occurs in computers where a power spike can cause significant damage.Once the current is lowered and the power surge ends or the circuit draw is reduced, the PTC resettable fuse opens up and re-engages the circuit. This same process is repeated whenever a high current draw or power surge occurs.One application field for PTC resettable fuses is the automotive industry, as it helps prevent the current draw of high power components such as starter motors, alternators, and headlight units. It is also useful in industrial applications, such as protect motors and transformers from high current surges. Although many people may think of these fuses as a last resort when actual conventional fuses fail, they can also be used as a primary safety device as they are designed to reset themselves after any short circuit occurs.In addition to protecting the circuit from high currents, PTC resettable fuses also operate as over temperature protection devices. Once the temperature within the circuit reaches a certain level, the PTC resettable fuse will trip and shut off the power. This can be very helpful in saving components and preventing overheated circuits from becoming damaged or destroyed.In short, PTC resettable fuses are a safety device that is designed to protect circuits from high current draw or power surges. They are available in many different sizes and their advantage over traditional fuses is that they reset themselves automatically after Tripping. This makes them ideal for use in many different electronics and automotive applications.

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