Equivalent & Substitute Parts for GMC-1.6-R

Part Overview

The GMC-1.6-R is a 1.6 A, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This medium-blow fuse is designed for 5mm x 20mm holder applications and is classified as Active product status. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative manufacturers' products meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	GMC-1.6-R
Manufacturer	Eaton - Electronics Division
Current Rating	1.6 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100A
Mounting Type	Requires Holder
Product Status	Active
RoHS Status	ROHS3 Compliant
Approval Agencies	CSA, KC-MARK, MITI, UL

Substitute Part Grouping Explanation

Substitute parts for the GMC-1.6-R are classified into two categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Equivalents (Eaton - Electronics Division): These parts share identical electrical specifications with the main part: 1.6 A current rating, 250 V AC voltage rating, medium-blow response time, 100A breaking capacity, and 5mm x 20mm package dimensions. Substitution is based on matching these core parameters without deviation.

Parametric Equivalents (Cross-Manufacturer): These parts from Littelfuse Inc. and OptiFuse match the critical electrical parameters (1.6 A, 250 V AC, medium-blow response, 100A breaking capacity, 5mm x 20mm package) but may differ in secondary characteristics such as melting I²t values, DC cold resistance, or approval agency certifications. Substitution is valid when the application requirements align with these matched parameters.

Similar Parts (Different Voltage or Response Characteristics): The Littelfuse 021801.6MXP operates at 250 V AC but features slow-blow response and lower breaking capacity (35A), making it suitable only for applications where slow-blow characteristics are acceptable. The Littelfuse 023301.6MXP operates at 125 V AC (not 250 V), limiting its use to lower-voltage applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating - AC (V)	Response Time	Package	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status
GMC-1.6-R	Eaton	1.6	250	Medium Blow	5x20mm	100	5.8	0.067	Active
BK/GMC-1.6-R	Eaton	1.6	250	Medium Blow	5x20mm	100	5.8	0.067	Active
BK1/GMC-1.6-R	Eaton	1.6	250	Medium Blow	5x20mm	100	5.8	0.067	Active
023401.6MXP	Littelfuse	1.6	250	Medium Blow	5x20mm	100	6.14	0.0884	Active
MSC-1.6A	OptiFuse	1.6	250	Medium Blow	5x20mm	100	7.795	Not Provided	Active
021801.6MXP	Littelfuse	1.6	250	Slow Blow	5x20mm	35	23.35	0.0336	Active
023301.6MXP	Littelfuse	1.6	125	Medium Blow	5x20mm	10000	6.14	0.088	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Drop-In Replacement):

BK/GMC-1.6-R and BK1/GMC-1.6-R are direct equivalents manufactured by Eaton - Electronics Division. These parts carry identical electrical and mechanical specifications to the GMC-1.6-R, including current rating, voltage rating, response time, breaking capacity, and package dimensions. Both parts maintain Active product status and ROHS3 compliance. BK1/GMC-1.6-R offers higher inventory availability (9060 units) compared to BK/GMC-1.6-R (1372 units). Selection between these three Eaton variants is based on procurement availability and inventory levels.

Tier 2 - Parametric Equivalents (Cross-Manufacturer Substitution):

023401.6MXP (Littelfuse Inc.) and MSC-1.6A (OptiFuse) are parametric equivalents that match all critical electrical parameters: 1.6 A current rating, 250 V AC voltage rating, medium-blow response time, 100A breaking capacity, and 5mm x 20mm package dimensions. Both parts are Active status and ROHS3 compliant. These parts are suitable for applications where cross-manufacturer substitution is acceptable. Littelfuse 023401.6MXP provides broader approval agency coverage (CE, CSA, K-MARK, PSE, UL) and extended operating temperature range (-55°C to 125°C). OptiFuse MSC-1.6A carries cULus and UL 248 certifications with equivalent operating temperature range.

Tier 3 - Limited Substitutes (Application-Specific Only):

021801.6MXP (Littelfuse Inc., Slow Blow) is suitable only for applications requiring slow-blow response characteristics. This part differs from the main specification in response time (slow vs. medium) and breaking capacity (35A vs. 100A), restricting its use to circuits designed for slow-blow protection.

023301.6MXP (Littelfuse Inc., 125V) is restricted to 125 V AC applications and is not suitable for 250 V AC circuits. This part operates at half the voltage rating of the main part and must not be used in higher-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-1.6-R and BK1/GMC-1.6-R be used interchangeably with GMC-1.6-R?

A: Yes. Both BK/GMC-1.6-R and BK1/GMC-1.6-R are direct equivalents manufactured by Eaton - Electronics Division with identical electrical and mechanical specifications. All three parts share the same current rating (1.6 A), voltage rating (250 V AC), response time (medium blow), breaking capacity (100A), and package dimensions (5mm x 20mm). They are fully interchangeable for drop-in replacement applications.

Q: What is the difference between the GMC-1.6-R and the Littelfuse 023401.6MXP?

A: Both parts meet the same electrical specifications: 1.6 A, 250 V AC, medium-blow response, 100A breaking capacity, and 5mm x 20mm package. The primary differences are manufacturer (Eaton vs. Littelfuse), melting I²t value (5.8 vs. 6.14), DC cold resistance (0.067 vs. 0.0884 Ohms), and approval agency certifications. Littelfuse 023401.6MXP offers extended operating temperature range (-55°C to 125°C) and broader international certifications (CE, CSA, K-MARK, PSE, UL).

Q: Can the Littelfuse 021801.6MXP replace the GMC-1.6-R?

A: No, not as a direct replacement. While both parts share the same current rating (1.6 A), voltage rating (250 V AC), and package dimensions (5mm x 20mm), the Littelfuse 021801.6MXP features slow-blow response time and lower breaking capacity (35A vs. 100A). This part is suitable only for applications specifically designed for slow-blow fuse protection. Using it in a circuit designed for medium-blow protection will result in incorrect circuit behavior.

Q: Can the Littelfuse 023301.6MXP be used in a 250 V AC circuit?

A: No. The Littelfuse 023301.6MXP is rated for 125 V AC maximum, not 250 V AC. Using this part in a 250 V AC circuit exceeds its voltage rating and creates a safety hazard. This part is restricted to 125 V AC applications only.

Q: What are the key parameters that determine if a fuse can substitute for the GMC-1.6-R?

A: The critical parameters for substitution are: (1) Current Rating: must be 1.6 A; (2) Voltage Rating - AC: must be 250 V or higher; (3) Response Time: must be medium blow; (4) Package / Case: must be 5mm x 20mm; (5) Fuse Type: must be cartridge glass; (6) Mounting Type: must require holder. Secondary parameters such as melting I²t, DC cold resistance, and approval agencies may vary between manufacturers but do not prevent substitution if the critical parameters match.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (BK/GMC-1.6-R, BK1/GMC-1.6-R, 023401.6MXP, MSC-1.6A, 021801.6MXP, and 023301.6MXP) are ROHS3 compliant.

Q: Which substitute part has the highest inventory availability?

A: BK1/GMC-1.6-R (Eaton - Electronics Division) has the highest inventory availability with 9060 units in stock, followed by 021801.6MXP (Littelfuse, 2622 units) and 023301.6MXP (Littelfuse, 2240 units).

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