RUEF300-2 Circuit Protection

Resistance - Initial (Ri) (Min):	20 mOhms
Approvals:	CQC, CSA, TUV, UL
Lead Spacing:	0.199" (5.05mm)
Thickness (Max):	--
Height - Seated (Max):	0.650" (16.50mm)
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®, RUEF
Time to Trip:	10.8s
Current - Trip (It):	6A
Current - Hold (Ih) (Max):	3A
Current - Max:	100A
Voltage - Max:	30V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

PTC Resettable Fuses are an important class of fuses that can be used in conjunction with other components in an array of power and electronic circuits. The RUEF300-2 is a particular type of PTC resettable fuse, of which this article covers the application field and working principle.

Applications

PTC resettable fuses are well known for their use in enhanced surge current protection. The RUEF300-2 is no exception as it offers the additional benefits of being highly accurate in detecting and interrupting abnormal overcurrents. It is ideal for applications that require extreme precision, such as medical equipment, electric vehicles, and computer systems. The RUEF300-2 can also be employed in automated internet-connected devices, as its superior protection and reliability are well suited for such emergent technology.

Technical Specifications

The RUEF300-2 has a rated voltage of 300V and a hold current of 0.5A, which are both equal to the standard value for all PTC resettable fuses. It has a high surge current capacity of 50A, making it suitable for a range of current protection applications. The maximum operating temperature is 60°C and the operating temperature range is 0 to +60°C, ideal for a wide range of industrial applications. In terms of its physical dimensions, the RUEF300-2 has a diameter of 27.5mm and a length of 12mm.

Working Principle

The RUEF300-2 uses a unique resistive element that acts as the "current interruption device" (CID). This device is designed to detect and then limit excessive current in the event of an overcurrent situation. When the device senses an abnormal amount of current, the resistive element functions like a switch which restricts the flow of current until the fuse can safely break the connection. The device is designed to work in a cycle, allowing it to reset itself after tripping and remove the fault from the circuit.

Conclusion

RUEF300-2 PTC resettable fuses are designed with extremely accurate overcurrent detection abilities. This makes them well-suited for a variety of applications, from medical equipment to automated internet-connected devices. In terms of technical specifications, the device has a rated voltage of 300V, a hold current of 0.5A, and a maximum surge current capacity of 50A. The working principle of the RUEF300-2 revolves around a uniquely designed resistive element that acts as its Current Interruption Device, and which allows for the fuse to be continually retriggered until the fault is removed.

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