RUE300

Resistance - Initial (Ri) (Min):	20 mOhms
Approvals:	CSA, TUV, UR
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.681" (17.30mm)
Size / Dimension:	0.449" L x 0.118" W (11.40mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	80 mOhms
Series:	PolySwitch®
Time to Trip:	10.8s
Current - Trip (It):	6A
Current - Hold (Ih) (Max):	3A
Current - Max:	40A
Voltage - Max:	30V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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PTC Resettable Fuses

PTC resettable fuses, known as polyfuses or PPTC fuses, are electrical safety devices that quickly detect and respond to excessive currents in a circuit. They are a simple, cost effective way of protecting circuits from overload and short-circuit conditions. PTC resettable fuses are becoming increasingly popular for many types of industrial applications, including those related to electrical systems, medical electronics, and consumer electronics.

RUE 300 Application Field and Working Principle

RUE 300 polyfuses are a specific type of PTC resettable fuse used in a variety of applications. The RUE 300 polyfuse is an especially well-suited choice for low-power, linear applications like consumer electronics, automotive components, and medical devices. This type of fuse has a nominal operation voltage of 300V, a melting current between 4.5A to 7A, and a nominal holding current of 500mA. It has current limit capabilities, providing a stable current flow when connected correctly, and it is fast-acting.When an excessive current flows through a circuit containing an RUE 300 polyfuse, the fuse will heat up, expanding a non-conductive region within the device. This expansion will result in an electrical disconnection that interrupts the flow of current and thus protecting the circuit from damage. When the current is reduced to a safe level, the non-conductive region will return to its original state, allowing the current to flow again as normal. The process of electrical disconnection and re-connection is a continuous loop in which the fuse is constantly adjusting itself to the conditions of the circuit it is protecting.In terms of safety, the RUE 300 polyfuse is well suited for applications that require UL Certification and is also self-extinguishing and flame retardant, meaning it won’t be a hazard in the event of a fire. It is constructed with a rugged plastic material that is resistant to heat and provides additional insulation.In terms of usability, the RUE 300 polyfuse is easy to install. It is very compact in size, allowing it to be placed in tight areas or crowded spaces, and it doesn’t need a large amount of space for mounting. Additionally, the RUE 300’s shape allows it to be used in a variety of circuit board layouts.In summary, the RUE 300 polyfuse is a popular choice for many applications due to its low cost, fast response time, and its simple and efficient design. It is a reliable option for many different types of circuits and provides a great protection feature for circuits.

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