GMD-315-R Equivalent & Substitute Parts

Part Overview

The GMD-315-R is a 315 mA, 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 designed for circuit protection applications requiring slow blow response characteristics. The part is active in production status with CSA and UL approval certifications. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	315 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the GMD-315-R are grouped based on electrical and mechanical parameter equivalence. All identified substitutes maintain the following critical specifications: 315 mA current rating, 250 V AC voltage rating, slow blow response time, 5mm x 20mm physical dimensions, 35A breaking capacity, and glass cartridge construction. Substitutes are categorized as direct manufacturer equivalents (same manufacturer, different series designations), parametric equivalents (different manufacturers, identical electrical performance), and similar alternatives (different manufacturers with comparable but not identical melting I²t or resistance characteristics). Selection among substitute parts depends on approval agency requirements, operating temperature range, and specific application compliance needs.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies
GMD-315-R	Eaton	GMD	315	250	Slow Blow	5x20mm	35	0.89	2.4	CSA, UL
BK/GMD-315-R	Eaton	GMD	315	250	Slow Blow	5x20mm	35	0.89	2.4	CSA, UL
BK/S506-315-R	Eaton	S506	315	250	Slow Blow	5x20mm	35	0.621	0.45	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE
BK1/S506-315-R	Eaton	S506	315	250	Slow Blow	5x20mm	35	0.621	0.45	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE
S506-315-R	Eaton	S506	315	250	Slow Blow	5x20mm	35	0.621	0.45	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE
0213.315MXP	Littelfuse	213	315	250	Slow Blow	5x20mm	35	1.14	0.8475	BSI, CCC, CE, CSA, SEMKO, UR, VDE
0218.315TXP	Littelfuse	218	315	250	Slow Blow	5x20mm	35	1.11	0.8475	CCC, CE, CSA, KC, SEMKO, UL, VDE
0034.3112	SCHURTER	FST 5x20	315	250	Slow Blow	5x20mm	35	0.544	Not Specified	CCC, cURus, VDE
0034.3769	SCHURTER	FSL 5x20	315	250	Slow Blow	5x20mm	35	0.345	Not Specified	cULus
0034.5038	SCHURTER	FTT 5x20	315	250	Slow Blow	5x20mm	35	4.17	Not Specified	cURus
0034.5612.11	SCHURTER	SMD-FST	315	250	Slow Blow	5x20mm	35	0.544	Not Specified	cURus, VDE

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division)

BK/GMD-315-R and S506 series variants (BK/S506-315-R, BK1/S506-315-R, S506-315-R) are direct equivalents manufactured by Eaton. The GMD and S506 series maintain identical electrical specifications and mechanical dimensions. The S506 series variants provide expanded approval agency certifications including BSI, CCC, IMQ, SEMKO, UR, and VDE, in addition to CSA and UL. Selection between GMD and S506 series should be based on specific regulatory requirements for the application.

Littelfuse Alternatives

0213.315MXP and 0218.315TXP from Littelfuse maintain the required 315 mA, 250 V, slow blow, 5x20mm specifications. Both parts carry CSA and UL certifications along with additional international approvals (BSI, CCC, CE, SEMKO, VDE). Operating temperature range extends to -55°C to 125°C. These parts are suitable for applications requiring broader temperature performance and expanded compliance certifications.

SCHURTER Alternatives

SCHURTER parts (0034.3112, 0034.3769, 0034.5038, 0034.5612.11) meet the core electrical and mechanical requirements. Selection among SCHURTER variants depends on melting I²t requirements and operating temperature specifications. 0034.3112 and 0034.5612.11 provide -55°C to 125°C operating range. 0034.3769 and 0034.5038 operate within -40°C to 85°C range. Approval agencies vary by series; verify compliance requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can GMD-315-R be directly replaced with S506-315-R?

A: Yes. Both parts are manufactured by Eaton and maintain identical electrical specifications (315 mA, 250 V AC, slow blow response) and mechanical dimensions (5mm x 20mm). The S506 series provides additional approval agency certifications (BSI, CCC, IMQ, SEMKO, UR, VDE) beyond the GMD series (CSA, UL). Substitution is valid when application compliance requirements are met by the S506 certifications.

Q: What is the significance of melting I²t values in the parameter comparison?

A: Melting I²t represents the thermal energy required to melt the fuse element and is a measure of fuse sensitivity. While all listed substitutes maintain the same 315 mA current rating and 250 V voltage rating, melting I²t values vary (ranging from 0.345 to 4.17). These variations reflect different fuse element designs and response characteristics. Selection should confirm that the substitute's melting I²t is appropriate for the specific circuit protection application.

Q: Are Littelfuse parts 0213.315MXP and 0218.315TXP interchangeable with Eaton GMD-315-R?

A: Yes, for applications requiring the specified electrical and mechanical parameters. Both Littelfuse parts maintain 315 mA, 250 V, slow blow, 5x20mm specifications. Littelfuse parts carry CSA and UL certifications plus additional international approvals. Verify that application compliance requirements are satisfied by the specific certifications of the selected Littelfuse part.

Q: What are the differences between SCHURTER FST, FSL, FTT, and SMD-FST series?

A: All SCHURTER variants maintain the required 315 mA, 250 V, slow blow, 5x20mm specifications. Primary differences are melting I²t values and operating temperature ranges. FST (0034.3112) and SMD-FST (0034.5612.11) share identical melting I²t (0.544) and -55°C to 125°C operating range. FSL (0034.3769) has lower melting I²t (0.345) and -40°C to 85°C range. FTT (0034.5038) has significantly higher melting I²t (4.17) and -40°C to 85°C range. Selection depends on circuit protection requirements and thermal environment.

Q: Does the 5mm x 20mm package dimension apply to all substitute parts?

A: Yes. All listed substitute parts maintain the 5mm x 20mm physical dimensions specified for the GMD-315-R. This ensures mechanical compatibility with existing fuse holders designed for this package size.

Q: Which substitute parts have the broadest approval agency coverage?

A: S506 series variants (BK/S506-315-R, BK1/S506-315-R, S506-315-R) carry certifications from BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE. Littelfuse 0218.315TXP includes CCC, CE, CSA, KC, SEMKO, UL, and VDE. These parts are suitable for applications requiring compliance with multiple international standards.

Q: Can SCHURTER parts be used as direct replacements in all applications?

A: SCHURTER parts meet the core electrical and mechanical specifications. However, approval agency certifications vary by series. Verify that the specific SCHURTER part's certifications (cURus, VDE, cULus) satisfy application compliance requirements before substitution.

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