RUEF600-1 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUEF600-1 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® RUEF series. This through-hole radial disc component provides overcurrent protection with a 30V maximum voltage rating and 6A hold current specification. The part is currently active in production with full inventory availability (875 pcs in stock). Substitute parts are identified when electrical parameters, mechanical form factor, and compliance certifications remain equivalent, enabling direct replacement in circuit protection applications without design modification.

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)
Type	Polymeric
Series	PolySwitch®, RUEF

Substitute Part Grouping Explanation

Substitution eligibility for the RUEF600-1 is determined by strict equivalence across the following critical parameters:

Voltage rating (30V maximum)
Current hold specification (6A Ih maximum)
Current trip threshold (12A It)
Resistance characteristics (5 mOhms initial, 40 mOhms post-trip maximum)
Operating temperature range (-40°C to 85°C)
Mounting configuration (through-hole radial disc)
Physical dimensions and lead spacing (0.650" L x 0.118" W, 0.400" lead spacing)
Polymeric PTC type classification
PolySwitch® RUEF series designation

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. No parameter deviation is permitted for substitution eligibility.

Parameter Comparison

Parameter	RUEF600-1	RUEF600	Match Status
Manufacturer	Littelfuse Inc.	Littelfuse	Equivalent
Series	PolySwitch®, RUEF	PolySwitch®, RUEF	Equivalent
Type	Polymeric	Polymeric	Equivalent
Voltage - Max	30V	30V	Equivalent
Current - Hold (Ih) (Max)	6 A	6 A	Equivalent
Current - Trip (It)	12 A	12 A	Equivalent
Current - Max	100 A	100 A	Equivalent
Time to Trip	16 s	16 s	Equivalent
Resistance - Initial (Ri) (Min)	5 mOhms	5 mOhms	Equivalent
Resistance - Post Trip (R1) (Max)	40 mOhms	40 mOhms	Equivalent
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Radial, Disc	Radial, Disc	Equivalent
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)	Equivalent
Lead Spacing	0.400" (10.15mm)	0.400" (10.15mm)	Equivalent
Product Status	Active	Active	Equivalent
Approval Agency	CQC, CSA, TUV, UL	CQC, CSA, TUV, UL	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

The RUEF600 is a direct parametric equivalent to the RUEF600-1. Both components are manufactured by Littelfuse, carry identical electrical specifications, and maintain the same physical form factor. Both parts hold active product status with full regulatory compliance across CQC, CSA, TUV, and UL certifications. RoHS3 compliance and REACH unaffected status are consistent across both parts. Selection between RUEF600-1 and RUEF600 may be based on inventory availability (RUEF600 has 4850 pcs in stock versus 875 pcs for RUEF600-1) and packaging requirements, both specified as bag packaging. No electrical or mechanical design changes are required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can RUEF600 replace RUEF600-1 in existing designs? A: Yes. RUEF600 is a parametric equivalent with identical voltage, current, resistance, temperature, and physical specifications. Direct substitution is permissible without circuit modification.

Q: Are there differences in lead spacing or mounting between these parts? A: No. Both parts feature 0.400" (10.15mm) lead spacing and through-hole radial disc mounting. PCB footprints are identical.

Q: Do both parts meet the same regulatory standards? A: Yes. Both RUEF600-1 and RUEF600 carry CQC, CSA, TUV, and UL approvals with ROHS3 compliance and REACH unaffected status.

Q: What is the difference between these part numbers? A: The parts are electrically and mechanically equivalent. The difference in part number designation (RUEF600-1 versus RUEF600) reflects packaging or distribution variants from Littelfuse, not functional differences.

Q: Which part should be selected based on availability? A: RUEF600 has higher inventory (4850 pcs) compared to RUEF600-1 (875 pcs). Selection may prioritize availability for production schedules while maintaining identical performance.

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