RUE600 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUE600 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 30V at 6A hold current with a 12A trip current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The RUE600 belongs to the PolySwitch® series and is designed for through-hole radial mounting in disc package configuration.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	6 A
Current - Trip (It)	12 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
Lead Spacing	0.402" (10.20mm)

Substitute Part Grouping Explanation

Substitution eligibility for the RUE600 is determined by strict electrical and mechanical parameter matching:

Core Electrical Parameters (Non-Negotiable):

Voltage rating: 30V maximum
Current hold (Ih): 6A maximum
Current trip (It): 12A
Time to trip: 16 seconds
Resistance initial (Ri): 5 mOhms minimum
Resistance post-trip (R1): 40 mOhms maximum
Operating temperature range: -40°C to 85°C

Mechanical Parameters (Non-Negotiable):

Mounting type: Through hole
Package type: Radial, disc
Lead spacing: 0.402" (10.20mm)

All substitute parts listed meet these core parameters. Variations in physical dimensions (length, height, seated height) and maximum current ratings above 12A trip current do not affect substitution eligibility, as these represent design margin enhancements or packaging variations compatible with the original application.

Parameter Comparison

Part Number	Manufacturer	Voltage (Max)	Ih (Max)	It	Ri (Min)	R1 (Max)	Time to Trip	Temp Range	Lead Spacing	Product Status
RUE600	Littelfuse Inc.	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.402"	Obsolete
30R600UF	Littelfuse Inc.	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.402"	Active
RUEF600	Littelfuse	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.400"	Active
0ZRB0600FF1A	Bel Fuse Inc.	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.402"	Active
MF-R600	Bourns Inc.	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.402"	Active
RS30-600	OptiFuse	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.402"	Active
PFRA.600	SCHURTER Inc.	30V	6 A	12 A	5 mOhms	40 mOhms	16 s	-40°C ~ 85°C	0.402"	Active

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status, providing supply continuity for the obsolete RUE600. Selection among substitutes should be based on the following criteria:

Littelfuse Ecosystem: 30R600UF and RUEF600 maintain continuity within the original manufacturer's product line. Both are RoHS3 compliant. RUEF600 carries broader approval agency certifications (CQC, CSA, TUV, UL) compared to 30R600UF (cURus, TUV).

Cross-Manufacturer Options: 0ZRB0600FF1A (Bel Fuse), MF-R600 (Bourns), RS30-600 (OptiFuse), and PFRA.600 (SCHURTER) all meet core electrical and mechanical parameters. 0ZRB0600FF1A includes AEC-Q200 automotive qualification. MF-R600 and PFRA.600 have identical physical dimensions (0.760" L x 1.256" H) and may require PCB layout verification. RS30-600 carries cULus and TUV certifications.

RoHS Compliance: All active substitutes are RoHS3 compliant, whereas the original RUE600 is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can I directly replace RUE600 with any of these substitute parts?

A: Yes. All listed parts meet the core electrical parameters (30V, 6A hold, 12A trip, 16s trip time) and mechanical requirements (through-hole radial, 0.402" lead spacing). Physical dimension variations do not affect electrical substitution.

Q: What is the difference between 30R600UF and RUEF600?

A: Both are Littelfuse products with identical electrical specifications. RUEF600 has broader approval certifications (CQC, CSA, TUV, UL versus cURus, TUV) and slightly different physical dimensions (0.949" seated height versus 1.055"). RUEF600 supports higher maximum current (100A versus 40A), providing additional design margin.

Q: Are there lead spacing differences I should be aware of?

A: RUEF600 has a lead spacing of 0.400" compared to 0.402" for all other parts. This 0.002" difference is within typical PCB tolerance and does not require layout modification.

Q: Which substitute offers the best supply availability?

A: 0ZRB0600FF1A (Bel Fuse) shows the highest inventory at 17,634 pieces. 30R600UF (Littelfuse) has 7,196 pieces available.

Q: Do all substitutes have the same operating temperature range?

A: Yes. All parts operate from -40°C to 85°C, matching the original RUE600 specification.

Q: Should I consider AEC-Q200 qualification for my application?

A: AEC-Q200 qualification is provided only by 0ZRB0600FF1A. This certification is relevant for automotive applications requiring automotive-grade component qualification.

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