TR250-120U

Resistance - Initial (Ri) (Min):	6 Ohms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.197" (5.00mm)
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):	16 Ohms
Series:	PolySwitch®
Time to Trip:	1s
Current - Hold (Ih) (Max):	120mA
Current - Max:	3A
Voltage - Max:	250V (60V Int)
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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PTC Resettable Fuses are a type of fuse that uses the temperature of the circuit to either open or close the circuit. A TR250-120U is a Polymeric Positive Temperature Co-efficient (PPTC) Resettable Fuse which, when used correctly, provides an alternative to the traditional ceramic fuses in some applications.The main function of the TR250-120U is to assure overcurrent protection through a self-resetting thermal-magnetic circuit breaker. It works using a combination of its thermal and magnetic properties which provide superior protection against any overload current. In operation, the TR250-120U\'s thermal-magnetic circuit breaker engages when an overload current flows through it. When the overload current passes through, it generates heat. The heat causes the polymer to expand, which then trips the magnetic coil. This in turn causes the circuit breaker to open, thus interrupting the current flow. The TR250-120U also has a unique feature in that it not only will break the current in the event of an overload, but will also reset itself after the current has returned to normal. It does this via a bimetallic strip which will cool and cause the breaker to reset itself. This allows for a quick restoration of power without having to manually reset the breaker.The TR250-120U\'s main application field is in communications and consumer electronics. One area in which the TR250-120U is often used is in mobile phones and other portable devices. It is used to ensure safe operation and protect the device from overcurrent conditions, as well as providing the added benefit of self-resetting. Another area in which the TR250-120U is often used is in automotive applications. It is usually used to protect electronic control units from overcurrent conditions while allowing for resetting of the circuit breaker. It can also be used to protect wiring and sensors from overcurrent conditions that could otherwise damage the device.The TR250-120U also has the capability of being used in higher power applications such as in high voltage installations. Here, the user would need to limit the overcurrent events in order to guarantee safe operation. The TR250-120U is capable of providing low internal resistance to ensure a high level of short circuit protection. In conclusion, the TR250-120U is an ideal solution in many applications where protection from overcurrent conditions is necessary. It provides an alternative to the traditional ceramic fuse while still providing superior protection from overloads. It is also capable of self-resetting, which adds to its versatility and makes it an attractive choice for applications in communications, consumer electronics, and automotive.

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