RGE1100 Equivalent & Substitute Parts

Part Overview

The RGE1100 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® series, rated for 16V maximum voltage and 11A hold current. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new designs. Polymeric PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds trip thresholds, then resetting when the fault condition clears.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	11 A
Current - Trip (It)	18.7 A
Current - Max	100 A
Resistance - Initial (Ri) (Min)	3.7 mOhms
Resistance - Post Trip (R1) (Max)	8.9 mOhms
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.199" (5.05mm)
Approval Agency	CSA, TUV, UL

Substitute Part Grouping Explanation

Substitution eligibility for the RGE1100 is determined by the following critical parameters:

Voltage rating equal to or greater than 16V
Hold current (Ih) equal to 11A
Trip current (It) equal to 18.7A
Mounting type: Through Hole
Package type: Radial, Disc
Lead spacing compatible with 0.199" (5.05mm) spacing
Approval certifications: CSA, TUV, UL

Three active substitute parts meet these criteria. Variations in time-to-trip, initial resistance, and post-trip resistance are acceptable within the polymeric PTC fuse technology range, as these parameters do not affect mechanical or electrical compatibility in standard circuit protection applications.

Parameter Comparison

Parameter	RGE1100	RGEF1100	0ZRA1100FF1A	MF-RG1100-0
Manufacturer	Littelfuse Inc.	Littelfuse	Bel Fuse Inc.	Bourns Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	16V	16V	16V	16V
Current - Hold (Ih) (Max)	11 A	11 A	11 A	11 A
Current - Trip (It)	18.7 A	18.7 A	18.7 A	18.7 A
Current - Max	100 A	100 A	100 A	100 A
Time to Trip	7 s	7 s	14.6 s	15.2 s
Resistance - Initial (Ri) (Min)	3.7 mOhms	3.7 mOhms	3 mOhms	3 mOhms
Resistance - Post Trip (R1) (Max)	8.9 mOhms	8.9 mOhms	10 mOhms	10 mOhms
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.669" L x 0.098" W (17.00mm x 2.50mm)	0.669" L x 0.098" W (17.00mm x 2.50mm)	0.689" L x 0.118" W (17.50mm x 3.00mm)	0.689" L x 0.118" W (17.50mm x 3.00mm)
Lead Spacing	0.199" (5.05mm)	0.199" (5.05mm)	0.201" (5.10mm)	0.201" (5.10mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV	CSA, TUV, UR

Engineering Selection Recommendations

RGEF1100 is the primary direct substitute for RGE1100. Both parts are manufactured by Littelfuse Inc., share identical electrical specifications (voltage, hold current, trip current, time to trip, and resistance values), and maintain the same physical dimensions and lead spacing. RGEF1100 is active in production and ROHS3 compliant, addressing the obsolescence of the original part.

0ZRA1100FF1A (Bel Fuse Inc.) and MF-RG1100-0 (Bourns Inc.) are functionally equivalent alternatives. Both maintain the required 16V/11A ratings and 18.7A trip current. Physical dimensions differ slightly (0.689" L x 0.118" W versus 0.669" L x 0.098" W), and lead spacing increases marginally to 0.201" (5.10mm). Time-to-trip specifications are longer (14.6s and 15.2s respectively), and post-trip resistance is higher (10 mOhms maximum). Both parts are ROHS3 compliant and carry appropriate regulatory certifications. These alternatives are suitable for applications where the dimensional and temporal variations are acceptable within circuit design tolerances.

Frequently Asked Questions (FAQ)

Q: Can RGEF1100 be used as a direct replacement for RGE1100?

A: Yes. RGEF1100 is manufactured by the same company (Littelfuse Inc.) and shares identical electrical and physical specifications with RGE1100. It is the recommended substitute due to active production status and ROHS3 compliance.

Q: What are the differences between RGEF1100 and the Bel Fuse or Bourns alternatives?

A: RGEF1100 matches RGE1100 exactly in dimensions, lead spacing, and response time. The 0ZRA1100FF1A and MF-RG1100-0 alternatives have slightly larger physical dimensions (0.689" L x 0.118" W), marginally increased lead spacing (0.201"), and longer time-to-trip values (14.6s and 15.2s). These differences do not affect electrical compatibility but may require PCB layout verification.

Q: Are all substitute parts ROHS3 compliant?

A: RGEF1100, 0ZRA1100FF1A, and MF-RG1100-0 are all ROHS3 compliant. The original RGE1100 is RoHS non-compliant.

Q: Do the substitute parts have the same regulatory certifications?

A: RGEF1100 carries CSA, TUV, and UL certifications, matching the original. 0ZRA1100FF1A carries cURus and TUV certifications. MF-RG1100-0 carries CSA, TUV, and UR certifications. All meet industry safety standards appropriate for polymeric PTC resettable fuses.

Q: Can I use 0ZRA1100FF1A or MF-RG1100-0 if my PCB is designed for RGE1100?

A: Physical compatibility depends on PCB layout. The slightly larger dimensions and increased lead spacing (0.201" versus 0.199") may require verification. Electrical functionality is maintained across all three alternatives for the specified 16V/11A application.

Q: What is the difference in time-to-trip between these parts?

A: RGE1100 and RGEF1100 trip in 7 seconds. 0ZRA1100FF1A trips in 14.6 seconds, and MF-RG1100-0 trips in 15.2 seconds. Longer trip times provide greater tolerance for transient overcurrent events before protection activation.

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