MPN

Littelfuse 0.5 A Resettable Fuse, 30 V

RS Stock No.:: 506-971
Mfr. Part No.:: RHEF050
Brand:: Littelfuse

Subtotal (1 pack of 5 units)*

£2.65

(exc. VAT)

£3.20

(inc. VAT)

FREE delivery for orders over £50.00

In Stock

5 unit(s) ready to ship from another location
Plus 380 unit(s) shipping from 11 March 2026

Need more? Click ‘Check delivery dates’ to find extra stock and lead times.

Units	Per unit	Per Pack*
5 +	£0.53	£2.65

*price indicative

RS Stock No.:: 506-971
Mfr. Part No.:: RHEF050
Brand:: Littelfuse

Specifications

Technical Reference

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Littelfuse
	Product Type	Resettable Fuse
	Trip Current	920mA
	Voltage	30 V
	Current Rating	40 A
	Time to Trip	2.5s
	Hold Current	0.5A
	Length	7.4mm
	Height	12.7mm
	Width	3 mm
	Minimum Resistance	0.48Ω
	Minimum Operating Temperature	-40°C
	Maximum Resistance	1.1Ω
	Maximum Operating Temperature	60°C
	Power Dissipation	0.9W
	Standards/Approvals	TUV, UL, RoHS, CSA
	Lead Orientation	Radial
	Series	RUSBF

	Select all
	Brand Littelfuse
	Product Type Resettable Fuse
	Trip Current 920mA
	Voltage 30 V
	Current Rating 40 A
	Time to Trip 2.5s
	Hold Current 0.5A
	Length 7.4mm
	Height 12.7mm
	Width 3 mm
	Minimum Resistance 0.48Ω
	Minimum Operating Temperature -40°C
	Maximum Resistance 1.1Ω
	Maximum Operating Temperature 60°C
	Power Dissipation 0.9W
	Standards/Approvals TUV, UL, RoHS, CSA
	Lead Orientation Radial
	Series RUSBF

PolySwitch™ PTC Devices RHEF Series

PCB Wire Ended

All are UL, CSA, TUV approved

Protection of electrical and electronic circuits against excessive currents

Rapid switch from low resistance state to very high resistance with electrical overload or short circuit

Quick and automatic reset and return to low resistance state when fault condition corrected and power removed

Features:

Automatically resets itself thousands of times

Maintenance free

Small size and no fuseholder required

Main applications:

Security systems

Power supplies and transformers

Power switching devices

Automotive and medical equipment

Instrumentation and control

Computers and peripherals

Audio visual and telecommunications

Approvals

UL, CSA, TUV