RHEF400

Resistance - Initial (Ri) (Min):	24 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	0.199" (5.05mm)
Thickness (Max):	--
Height - Seated (Max):	0.591" (15.00mm)
Size / Dimension:	0.394" L x 0.118" W (10.00mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 125°C
Resistance - Post Trip (R1) (Max):	60 mOhms
Series:	PolySwitch®, RHEF
Time to Trip:	5s
Current - Trip (It):	7.5A
Current - Hold (Ih) (Max):	4A
Current - Max:	100A
Voltage - Max:	16V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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PTC Resettable Fuses: RHEF400 Application Field and Working Principle

PTC resettable fuses (also called polymeric positive temperature coefficient or PTC fuses) is a type of fuse that can be reset after certain fault conditions. It is designed to protect electronic equipment from high-current overloads, short circuits, and other potentially damaging conditions. The RHEF400 is an auto-resetting PTC fuse specifically designed for use in LED lighting applications. This article will discuss the applications of RHEF400 fuses and how they operate.The RHEF400 is designed for use in LED lighting applications and offers electrical protection for both converters and LED drivers. It provides low-voltage dropout, low-current inrush, and robust overcurrent protection. The PTC element of the fuse provides reliable, self-resetting protection and can handle up to 20A of continuous current (minus the inrush current).The RHEF400 is designed to offer protection from the high-inrush current caused when LEDs are powered-on. When an overcurrent flows through the PTC component, which is connected in series to the load, the temperature of the PTC element starts to rise. This causes the PTC to become more resistive to the flow of current, and eventually, the thermal protection triggers and that will shut off the power. This results in the LED being slightly dimmed until the thermal protection is reset.The two main advantages of using the RHEF400 PTC fuse for LED lighting applications are protection from overloads and short circuits, as well as low-voltage dropout and low-current inrush. With its auto-reset capability, the RHEF400 can quickly restore power to the LED lighting system after a fault condition.In addition to LED lighting applications, the RHEF400 can also be used in other applications such as automotive circuits and lighting fixtures. The overcurrent protection provided by the RHEF400 can prevent damage to vulnerable components in the circuit by limiting the maximum current.In summary, the RHEF400 is designed for use in LED lighting applications and other applications where overcurrent protection is required. The PTC element of the fuse provides reliable, self-resetting protection and can handle up to 20A of continuous current (minus the inrush current). With its low-voltage dropout, low-current inrush, and robust overcurrent protection, the RHEF400 is an ideal solution for applications where reliable protection is necessary.

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