RUEF600-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUEF600-2 is a Littelfuse PolySwitch® polymeric PTC resettable fuse designed for circuit protection in applications requiring 30V maximum voltage and 6A hold current rating. This through-hole radial disc component provides automatic protection against overcurrent conditions with a 12A trip current threshold and 16-second trip time. The part is currently active in production with 1710 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across manufacturing environments.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	6 A
Current - Trip (It)	12 A
Current - Max	100 A
Time to Trip	16 s
Resistance - Initial (Ri) (Min)	5 mOhms
Resistance - Post Trip (R1) (Max)	40 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.650" L x 0.118" W (16.50mm x 3.00mm)
Lead Spacing	0.400" (10.15mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RUEF600-2 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Current hold rating: 6A
Current trip rating: 12A
Trip time: 16 seconds
Initial resistance: 5 mOhms minimum
Post-trip resistance: 40 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through hole radial disc
Physical dimensions: 0.650" L x 0.118" W with 0.400" lead spacing
Regulatory compliance: ROHS3, CQC, CSA, TUV, UL certifications

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. Packaging format (Cut Tape) is consistent across all identified substitutes.

Parameter Comparison

Parameter	RUEF600-2	RUEF600-AP
Manufacturer	Littelfuse	Littelfuse
Series	PolySwitch®, RUEF	PolySwitch®, RUEF
Type	Polymeric	Polymeric
Voltage - Max	30V	30V
Current - Hold (Ih) (Max)	6 A	6 A
Current - Trip (It)	12 A	12 A
Current - Max	100 A	100 A
Time to Trip	16 s	16 s
Resistance - Initial (Ri) (Min)	5 mOhms	5 mOhms
Resistance - Post Trip (R1) (Max)	40 mOhms	40 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc
Size / Dimension	0.650" L x 0.118" W (16.50mm x 3.00mm)	0.650" L x 0.118" W (16.50mm x 3.00mm)
Height - Seated (Max)	0.949" (24.10mm)	0.949" (24.10mm)
Lead Spacing	0.400" (10.15mm)	0.400" (10.15mm)
Approval Agency	CQC, CSA, TUV, UL	CQC, CSA, TUV, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active
Packaging	Cut Tape (CT)	Cut Tape (CT)

Engineering Selection Recommendations

Both RUEF600-2 and RUEF600-AP are active production components manufactured by Littelfuse with identical electrical and mechanical specifications. Selection between these parts may be based on inventory availability: RUEF600-2 has 1710 units in stock, while RUEF600-AP has 1237 units in stock. Both parts carry full regulatory compliance certifications (CQC, CSA, TUV, UL) and meet ROHS3 requirements, making either suitable for applications requiring polymeric PTC resettable fuse protection in 30V, 6A circuits. No technical differentiation exists between these parts based on provided specifications.

Frequently Asked Questions (FAQ)

Q: Can RUEF600-AP be used as a direct replacement for RUEF600-2?

A: Yes. Both parts are parametric equivalents with identical voltage, current, resistance, temperature, and physical specifications. They share the same series designation, mounting type, and regulatory certifications.

Q: Are there any differences in performance between RUEF600-2 and RUEF600-AP?

A: No performance differences exist based on provided specifications. Both parts have identical hold current (6A), trip current (12A), trip time (16s), and resistance characteristics.

Q: What determines substitution eligibility for this PTC resettable fuse?

A: Substitution requires matching all critical parameters: 30V maximum voltage, 6A hold current, 12A trip current, 16-second trip time, 5 mOhms initial resistance, 40 mOhms maximum post-trip resistance, -40°C to 85°C operating temperature, through-hole radial disc mounting, and identical physical dimensions with 0.400" lead spacing.

Q: Are both parts RoHS compliant?

A: Yes. Both RUEF600-2 and RUEF600-AP are ROHS3 compliant and carry CQC, CSA, TUV, and UL certifications.

Q: Does packaging format affect substitution?

A: Both parts are supplied in Cut Tape (CT) packaging. Packaging format is consistent and does not restrict substitution eligibility.

Q: What is the lead spacing for PCB layout purposes?

A: The lead spacing is 0.400" (10.15mm) for both parts, ensuring identical PCB footprint compatibility.

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