RLD30P600UF Equivalent & Substitute Parts

Part Overview

The RLD30P600UF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., designed for overcurrent protection in through-hole applications. This component operates at 30V with a 6A hold current and 12A trip current, featuring a radial disc package configuration. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih)	6 A
Current - Trip (It)	12 A
Time to Trip	16 s
Resistance - Initial (Ri)	5 mOhms (Min)
Resistance - Post Trip (R1)	40 mOhms (Max)
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc

Substitute Part Grouping Explanation

Substitution eligibility for the RLD30P600UF is determined by the following critical parameters:

Voltage rating of 30V maximum
Hold current (Ih) of 6A
Trip current (It) of 12A
Time to trip of 16 seconds
Initial resistance (Ri) minimum of 5 mOhms
Post-trip resistance (R1) maximum of 40 mOhms
Operating temperature range of -40°C to 85°C
Through-hole radial disc package configuration

Two qualified substitutes meet these electrical and mechanical specifications while maintaining functional equivalence.

Parameter Comparison

Parameter	RLD30P600UF (Main)	RUEF600-AP (Littelfuse)	MF-R600 (Bourns)
Manufacturer	Littelfuse Inc.	Littelfuse	Bourns Inc.
Series	POLY-FUSE®, RLD30	PolySwitch®, RUEF	Multifuse®, MF-R
Product Status	Obsolete	Active	Active
Voltage - Max	30V	30V	30V
Current - Hold (Ih)	6 A	6 A	6 A
Current - Trip (It)	12 A	12 A	12 A
Current - Max	40 A	100 A	40 A
Time to Trip	16 s	16 s	16 s
Resistance - Initial (Ri)	5 mOhms (Min)	5 mOhms (Min)	5 mOhms (Min)
Resistance - Post Trip (R1)	40 mOhms (Max)	40 mOhms (Max)	40 mOhms (Max)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	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)	0.760" L x 0.118" W (19.30mm x 3.00mm)
Height - Seated (Max)	0.980" (24.90mm)	0.949" (24.10mm)	1.256" (31.90mm)
Lead Spacing	0.402" (10.20mm)	0.400" (10.15mm)	0.402" (10.20mm)
Approval Agency	cURus, TUV	CQC, CSA, TUV, UL	cURus, TUV
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both RUEF600-AP and MF-R600 satisfy the electrical requirements for direct substitution of the RLD30P600UF. Selection between these alternatives should consider the following factors:

RUEF600-AP (Littelfuse PolySwitch® RUEF series) maintains the closest dimensional match to the original part, with identical length and width specifications. This substitute carries active product status and holds expanded regulatory approvals including CQC, CSA, TUV, and UL certifications. The RUEF600-AP achieves ROHS3 compliance and is available in cut tape packaging with 1237 units in stock.

MF-R600 (Bourns Multifuse® MF-R series) provides functional equivalence with identical electrical parameters but exhibits larger physical dimensions, particularly in length (0.760" versus 0.650") and seated height (1.256" versus 0.980"). This substitute maintains active product status, holds cURus and TUV approvals, and achieves ROHS3 compliance. The MF-R600 is available in bulk packaging with 1677 units in stock.

For applications with space constraints or PCB layout requirements matching the original RLD30P600UF footprint, RUEF600-AP is the preferred selection. For applications where dimensional tolerance is less critical, MF-R600 remains a valid alternative with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can RUEF600-AP and MF-R600 be used interchangeably with RLD30P600UF?

A: Both substitutes meet the electrical specifications (30V, 6A hold, 12A trip, 16s trip time) and operating temperature range. However, dimensional differences exist. RUEF600-AP matches the original length and width precisely. MF-R600 is larger in length and height, requiring verification of PCB layout compatibility before substitution.

Q: What are the key electrical parameters that define substitution compatibility?

A: The critical parameters are voltage rating (30V), hold current (6A), trip current (12A), trip time (16s), initial resistance (5 mOhms minimum), and post-trip resistance (40 mOhms maximum). All three parts meet these specifications.

Q: Why is the RLD30P600UF obsolete?

A: The RLD30P600UF is listed as obsolete by Littelfuse. Active alternatives from both Littelfuse (RUEF600-AP) and Bourns (MF-R600) provide continued design support and component availability.

Q: Are there compliance differences between the substitutes?

A: RUEF600-AP and MF-R600 both achieve ROHS3 compliance, whereas the original RLD30P600UF is RoHS non-compliant. RUEF600-AP holds broader regulatory approvals (CQC, CSA, TUV, UL) compared to MF-R600 (cURus, TUV).

Q: What packaging options are available for these substitutes?

A: RUEF600-AP is supplied in cut tape (CT) packaging. MF-R600 is supplied in bulk packaging. The original RLD30P600UF packaging specification was not provided.

Q: Are there differences in maximum current ratings?

A: Yes. RUEF600-AP supports a maximum current of 100A, while both RLD30P600UF and MF-R600 support 40A maximum. For applications operating within the 6A hold and 12A trip specifications, this difference does not affect substitution validity.

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