BK1/GMD-2-R Equivalent & Substitute Parts

Part Overview

The BK1/GMD-2-R is a 2 A, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This component requires a fuse holder for installation and is classified as Active product status. The fuse is designed for circuit protection applications requiring slow-blow response characteristics and is RoHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative certifications are required for specific applications.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	42
DC Cold Resistance	0.107 Ohms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BK1/GMD-2-R are classified into two categories based on parametric equivalence and functional compatibility:

Parametric Equivalents (Eaton - Electronics Division): Parts BK/GDC-2A, BK/GMD-2-R, BK/S506-2-R, GDC-2A, and S506-2-R share identical electrical specifications with the main part: 2 A current rating, 250 V AC voltage rating, slow-blow response, 5mm x 20mm package, and glass cartridge construction. These parts differ in breaking capacity (35 A or 100 A), melting I²t values, DC cold resistance, and approval agency certifications. All are Active status products from Eaton and maintain RoHS3 compliance.

Similar Parts (Cross-Manufacturer): Littelfuse Inc. parts 0239002.HXEP and 0239002.MXEP, and SCHURTER Inc. parts 0034.3120, 0034.3779, and 0034.5046 match the core electrical parameters (2 A, 250 V AC, slow-blow, glass cartridge) and physical dimensions. These parts differ in mounting type (through-hole vs. requires holder), breaking capacity, melting I²t, operating temperature ranges, and approval agency certifications.

Substitution Criteria: All substitute parts maintain identical current rating (2 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow-blow), and package dimensions (5mm x 20mm). Differences in breaking capacity, melting I²t, DC cold resistance, and approval certifications determine suitability for specific circuit protection requirements and regional compliance mandates.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Fuse Type	Response Time	Package	Mounting Type	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	RoHS Status	Product Status
BK1/GMD-2-R	Eaton	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	100	42	0.107	CSA, PSE/JET, UL	ROHS3	Active
BK/GDC-2A	Eaton	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	35	31.6	0.03325	cULus, IMQ, MITI/JET	ROHS3	Active
BK/GMD-2-R	Eaton	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	100	42	0.107	CSA, PSE/JET, UL	ROHS3	Active
BK/S506-2-R	Eaton	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	35	31.6	0.03325	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	ROHS3	Active
GDC-2A	Eaton	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	35	31.6	0.03325	cURus, IMQ, MITI/JET	ROHS3	Active
S506-2-R	Eaton	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	35	31.6	0.03325	BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE	ROHS3	Active
0239002.HXEP	Littelfuse	2	250	Cartridge, Glass	Slow Blow	5x20mm (Axial)	Through Hole	100	50.585	0.0943	CE, CSA, KC, PSE, UL	ROHS3	Active
0239002.MXEP	Littelfuse	2	250	Cartridge, Glass	Slow Blow	5x20mm (Axial)	Through Hole	100	50.585	0.0943	CE, CSA, KC, PSE, UL	ROHS3	Active
0034.3120	SCHURTER	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	35	16	Not Specified	CCC, cURus, VDE	ROHS3	Active
0034.3779	SCHURTER	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	100	4.45	Not Specified	cULus	ROHS3	Active
0034.5046	SCHURTER	2	250	Cartridge, Glass	Slow Blow	5x20mm	Requires Holder	35	124	Not Specified	cURus	ROHS3	Active

Engineering Selection Recommendations

Eaton Parametric Equivalents: Parts BK/GDC-2A, BK/GMD-2-R, BK/S506-2-R, GDC-2A, and S506-2-R are direct substitutes for the BK1/GMD-2-R within the Eaton product family. BK/GMD-2-R and S506-2-R maintain 100 A breaking capacity matching the main part. BK/S506-2-R offers the broadest approval agency coverage (BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE), making it suitable for applications requiring multi-regional compliance. BK/GDC-2A and GDC-2A provide reduced breaking capacity (35 A) with lower DC cold resistance (0.03325 Ohms), appropriate for circuits with lower fault current ratings.

Littelfuse Cross-Manufacturer Alternatives: Parts 0239002.HXEP and 0239002.MXEP are functionally equivalent but feature through-hole mounting instead of holder-based installation. These parts maintain 100 A breaking capacity and higher melting I²t (50.585) compared to the main part. Selection requires circuit board redesign to accommodate axial through-hole mounting. Approval agencies include CE, CSA, KC, PSE, and UL.

SCHURTER Cross-Manufacturer Alternatives: Parts 0034.3120, 0034.3779, and 0034.5046 maintain holder-based mounting compatible with the main part's installation method. Part 0034.3779 matches the 100 A breaking capacity of the main part with cULus certification. Parts 0034.3120 and 0034.5046 provide 35 A breaking capacity with different melting I²t characteristics (16 and 124 respectively), suitable for specific circuit protection curves. Operating temperature ranges vary: 0034.3120 operates -55°C to 125°C, while 0034.3779 and 0034.5046 operate -40°C to 85°C.

Selection Criteria: Choose substitutes based on required breaking capacity (35 A or 100 A), regional approval agency requirements, mounting method compatibility (holder vs. through-hole), and operating temperature range. All substitute parts maintain identical current rating, voltage rating, fuse type, response time, and package dimensions as the main part.

Frequently Asked Questions (FAQ)

Q: Can BK/GDC-2A be used as a direct replacement for BK1/GMD-2-R?

A: BK/GDC-2A is electrically equivalent in current rating (2 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow-blow), and package dimensions (5x20mm). However, it has a lower breaking capacity (35 A vs. 100 A) and different DC cold resistance (0.03325 Ohms vs. 0.107 Ohms). Substitution is valid only if the circuit's maximum fault current does not exceed 35 A and the lower resistance is acceptable for the application.

Q: What is the difference between Eaton S506-2-R and BK/S506-2-R?

A: S506-2-R and BK/S506-2-R are parametrically identical Eaton products with identical electrical specifications, breaking capacity (35 A), melting I²t (31.6), and DC cold resistance (0.03325 Ohms). Both require holder-based mounting and are RoHS3 compliant. The primary difference is the part number prefix designation within Eaton's product line.

Q: Can Littelfuse 0239002.HXEP replace the BK1/GMD-2-R without circuit board modification?

A: No. The Littelfuse 0239002.HXEP features through-hole (axial) mounting, while the BK1/GMD-2-R requires a holder-based installation. Direct substitution requires circuit board redesign to accommodate the through-hole mounting configuration. Electrical parameters (2 A, 250 V AC, slow-blow, 5x20mm) are compatible, but physical installation method differs.

Q: Which substitute part has the broadest international approval coverage?

A: BK/S506-2-R and S506-2-R offer the most comprehensive approval agency certifications: BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE. These certifications support applications requiring compliance across North American, European, Asian, and international markets.

Q: How do melting I²t values affect fuse selection?

A: Melting I²t determines the fuse's thermal response to overcurrent conditions. The BK1/GMD-2-R has a melting I²t of 42. Substitute parts range from 4.45 (SCHURTER 0034.3779) to 124 (SCHURTER 0034.5046). Lower I²t values provide faster response to overcurrent; higher values provide slower response. Selection depends on the circuit's inrush current characteristics and protection requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—Eaton, Littelfuse, and SCHURTER—are RoHS3 compliant. This ensures compatibility with environmental and regulatory requirements across manufacturing and end-use applications.

Q: What is the significance of DC cold resistance differences?

A: DC cold resistance affects voltage drop across the fuse during normal operation. The BK1/GMD-2-R has 0.107 Ohms; Eaton alternatives have 0.03325 Ohms; Littelfuse alternatives have 0.0943 Ohms. Lower resistance reduces power dissipation and heat generation. Selection depends on circuit design requirements for voltage drop and thermal management.

Q: Can SCHURTER 0034.3779 be used in applications requiring -55°C operation?

A: No. SCHURTER 0034.3779 operates within -40°C to 85°C range. For applications requiring -55°C operation, SCHURTER 0034.3120 (operating -55°C to 125°C) is the appropriate substitute. The BK1/GMD-2-R does not specify an operating temperature range.

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