SCHURTER 0034.3974 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3974 is a 150 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection applications requiring holder-based mounting. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct replacement in existing designs.

Key Parameters

Parameter	Value
Current Rating	150 mA
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	35 A
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution classification is based on the following critical parameters: current rating (150 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and physical package (5mm x 20mm). Parts are grouped into two categories:

Direct Equivalents (Identical Electrical & Mechanical Specifications): Parts matching all critical parameters—0239.150MXP, BK/GMD-150-R, BK1/GMD-150-R, and GMD-150-R—are functionally interchangeable with the main part.

Similar Parts (Specification Variance): BK/S506-250-R differs in current rating (250 mA vs. 150 mA) and is not a direct equivalent; it is listed for reference only where circuit design permits higher current tolerance.

Parameter Comparison

Parameter	SCHURTER 0034.3974	Littelfuse 0239.150MXP	Eaton BK/GMD-150-R	Eaton BK1/GMD-150-R	Eaton GMD-150-R	Eaton BK/S506-250-R
Manufacturer	SCHURTER Inc.	Littelfuse	Eaton - Electronics Division	Eaton - Electronics Division	Eaton - Electronics Division	Eaton - Electronics Division
Current Rating (Amps)	150 mA	150 mA	150 mA	150 mA	150 mA	250 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A	35 A	35 A
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Approval Agency	CSA, UL	CE, UL	CSA, UL	CSA, UL	CSA, UL	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents): Littelfuse 0239.150MXP, Eaton BK/GMD-150-R, Eaton BK1/GMD-150-R, and Eaton GMD-150-R are all active products with identical electrical and mechanical specifications to the obsolete SCHURTER 0034.3974. All four parts maintain 150 mA current rating, 250 V AC voltage rating, slow-blow response, 5mm x 20mm package, and 35 A breaking capacity. All are ROHS3 compliant and REACH unaffected. Selection among these four direct equivalents may be based on availability, lead time, or regional certification requirements (Littelfuse 0239.150MXP includes CE certification; Eaton variants include CSA and UL).

Secondary Reference (Non-Equivalent): Eaton BK/S506-250-R is listed for reference only. This part differs in current rating (250 mA vs. 150 mA) and melting I²t characteristics, making it unsuitable as a direct replacement unless circuit design explicitly permits higher current tolerance and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use any of the four direct equivalent parts interchangeably with the SCHURTER 0034.3974?

A: Yes. Littelfuse 0239.150MXP, Eaton BK/GMD-150-R, Eaton BK1/GMD-150-R, and Eaton GMD-150-R are direct equivalents. All share identical current rating (150 mA), voltage rating (250 V AC), response time (slow blow), package dimensions (5mm x 20mm), and breaking capacity (35 A). Physical and electrical compatibility is confirmed.

Q: Why is the Eaton BK/S506-250-R listed if it is not a direct equivalent?

A: BK/S506-250-R is included for reference because it shares the same package form factor and voltage rating. However, its 250 mA current rating differs from the 150 mA specification of the main part. This part is suitable only in applications where circuit design permits higher current tolerance.

Q: What certifications should I verify for my application?

A: The SCHURTER 0034.3974 carries CSA and UL approvals. Direct equivalents maintain these certifications: Littelfuse 0239.150MXP includes CE and UL; Eaton variants (BK/GMD-150-R, BK1/GMD-150-R, GMD-150-R) include CSA and UL. Eaton BK/S506-250-R carries broader certification (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE). Confirm that selected substitute meets your regional and application-specific certification requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—0239.150MXP, BK/GMD-150-R, BK1/GMD-150-R, GMD-150-R, and BK/S506-250-R—are ROHS3 compliant and REACH unaffected, matching the compliance status of the main part.

Q: What is the difference between the three Eaton GMD variants?

A: BK/GMD-150-R, BK1/GMD-150-R, and GMD-150-R are all from the Eaton GMD series with identical electrical specifications (150 mA, 250 V, slow blow, 35 A breaking capacity). Differences exist in melting I²t values (0.046, 0.46, and 0.046 respectively) and part number designation. All three are active products with equivalent functional performance for 150 mA, 250 V applications.

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