AGC-1/8-R Equivalent & Substitute Parts Reference

Part Overview

The AGC-1/8-R is a fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division, rated for 125 mA at 250 V AC/DC. This fuse is designed for 3AB and 3AG holder applications with dimensions of 1/4" × 1-1/4" (6.35 mm × 31.75 mm). The part maintains active product status and is RoHS compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, holder compatibility, and approval certifications to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	125 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" × 1-1/4"
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, UL
Size / Dimension	0.250" Dia × 1.250" L (6.35 mm × 31.75 mm)

Substitute Part Grouping Explanation

Substitute parts for the AGC-1/8-R are classified based on strict electrical and mechanical parameter matching:

Direct Manufacturer Equivalent: BK/AGC-1/8-R is a direct equivalent from Eaton - Electronics Division with identical electrical specifications, mechanical dimensions, holder compatibility, and approval certifications. This part differs only in RoHS compliance status (ROHS3 Compliant vs. RoHS Compliant).

Parametric Equivalent: BK/AGC-B-1/8 is a parametric equivalent from Eaton - Electronics Division matching all electrical ratings, mechanical dimensions, and holder requirements. This part is RoHS non-compliant and should be selected only when RoHS compliance is not a system requirement.

Similar Manufacturer Parts: 0312.125HXCCP, 0312.125MXP, and 0312.125VXP are manufactured by Littelfuse Inc. (312 series). These parts match all critical electrical parameters (125 mA, 250 V AC/DC, fast-blow response, 35 A breaking capacity), mechanical dimensions (1/4" × 1-1/4"), and holder compatibility (3AB, 3AG). All Littelfuse alternatives are ROHS3 compliant and carry CE, CSA, and UL approvals. Minor variations exist in DC cold resistance (7.145 Ohms vs. 10.825 Ohms) and melting I²t (0.00289 vs. 0.002), which remain within acceptable tolerance for circuit protection equivalency.

Key Parameters for Substitution:

Current Rating: 125 mA
Voltage Rating: 250 V AC
Fuse Type: Cartridge, Glass
Response Time: Fast Blow
Holder Compatibility: 3AB, 3AG
Physical Dimensions: 1/4" × 1-1/4"
Breaking Capacity: 35 A

Parameter Comparison

Parameter	AGC-1/8-R (Eaton)	BK/AGC-1/8-R (Eaton)	BK/AGC-B-1/8 (Eaton)	0312.125HXCCP (Littelfuse)	0312.125MXP (Littelfuse)	0312.125VXP (Littelfuse)
Manufacturer	Eaton - Electronics Division	Eaton - Electronics Division	Eaton - Electronics Division	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	125 mA	125 mA	125 mA	125 mA	125 mA	125 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" × 1-1/4"	3AB, 3AG, 1/4" × 1-1/4"	3AB, 3AG, 1/4" × 1-1/4"	3AB, 3AG, 1/4" × 1-1/4"	3AB, 3AG, 1/4" × 1-1/4"	3AB, 3AG, 1/4" × 1-1/4"
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A	35 A	35 A
Melting I²t	0.002	0.002	0.002	0.00289	0.00289	0.00289
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance (Ohms)	10.825	10.825	10.825	7.145	7.145	7.145
Approval Agency	CSA, UL	CSA, UL	CSA, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
RoHS Status	RoHS Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For RoHS Compliance Requirements: Select BK/AGC-1/8-R (Eaton, ROHS3 Compliant) or any Littelfuse 312 series alternative (0312.125HXCCP, 0312.125MXP, 0312.125VXP). All three options carry ROHS3 compliance certification and maintain active product status. Littelfuse alternatives additionally carry CE certification, providing broader regulatory coverage for European applications.

For Direct Eaton Manufacturer Continuity: BK/AGC-1/8-R provides direct manufacturer equivalency with identical electrical and mechanical specifications. This part is recommended when maintaining single-source supplier consistency is a design requirement.

For Non-RoHS Applications: BK/AGC-B-1/8 (Eaton, RoHS non-compliant) is suitable for legacy systems or applications where RoHS compliance is not mandated. All electrical and mechanical parameters remain identical to the primary part.

For Cross-Manufacturer Substitution: Littelfuse 312 series parts (0312.125HXCCP, 0312.125MXP, 0312.125VXP) are functionally equivalent alternatives. These parts carry identical electrical ratings, mechanical dimensions, and holder compatibility. DC cold resistance variation (7.145 Ohms vs. 10.825 Ohms) and melting I²t difference (0.00289 vs. 0.002) fall within acceptable circuit protection tolerances. All Littelfuse alternatives are active products with ROHS3 compliance and CE/CSA/UL approvals.

Frequently Asked Questions (FAQ)

Q: Can BK/AGC-1/8-R be used as a direct replacement for AGC-1/8-R?

A: Yes. BK/AGC-1/8-R is a direct manufacturer equivalent from Eaton - Electronics Division with identical electrical ratings (125 mA, 250 V AC/DC), mechanical dimensions (1/4" × 1-1/4"), holder compatibility (3AB, 3AG), and approval certifications (CSA, UL). The only difference is RoHS compliance status (ROHS3 Compliant vs. RoHS Compliant).

Q: Are Littelfuse 312 series fuses compatible with 3AB and 3AG holders?

A: Yes. Littelfuse 0312.125HXCCP, 0312.125MXP, and 0312.125VXP are all rated for 3AB and 3AG holder compatibility with identical physical dimensions (1/4" × 1-1/4"). These parts are mechanically and electrically interchangeable with the AGC-1/8-R.

Q: What is the significance of the DC cold resistance difference between Eaton and Littelfuse parts?

A: Eaton AGC series parts have 10.825 Ohms DC cold resistance, while Littelfuse 312 series parts have 7.145 Ohms. This variation reflects different internal construction but does not affect circuit protection performance. Both values are within acceptable tolerance for 125 mA fast-blow fuses and do not impact holder compatibility or electrical function.

Q: Should I select a RoHS-compliant substitute?

A: RoHS compliance selection depends on system requirements. If your application or market requires RoHS compliance, select BK/AGC-1/8-R (Eaton, ROHS3 Compliant) or any Littelfuse 312 series alternative. If RoHS compliance is not required, BK/AGC-B-1/8 remains a valid option.

Q: What is the difference between the three Littelfuse 312 series alternatives?

A: 0312.125HXCCP, 0312.125MXP, and 0312.125VXP are all Littelfuse 312 series fuses with identical electrical specifications (125 mA, 250 V, fast-blow, 35 A breaking capacity), mechanical dimensions, holder compatibility, and compliance certifications. Part number variations reflect internal design or packaging differences that do not affect interchangeability in circuit protection applications.

Q: Are all substitute parts active products?

A: Yes. All listed substitute parts (BK/AGC-1/8-R, BK/AGC-B-1/8, 0312.125HXCCP, 0312.125MXP, 0312.125VXP) maintain active product status with current manufacturer support and availability.

Q: Can I mix Eaton and Littelfuse fuses in the same circuit board?

A: Yes. All substitute parts meet identical electrical ratings, mechanical dimensions, and holder requirements. Cross-manufacturer substitution is electrically and mechanically valid. Design consistency may favor single-manufacturer selection based on procurement or supply chain preferences.

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