SCHURTER 0034.3985 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3985 is a 750 mA, 250 V AC/DC glass cartridge fuse with 5mm x 20mm dimensions and slow-blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing system support and procurement. Substitute parts must maintain identical electrical ratings, mechanical form factor, and functional performance to ensure direct interchangeability in existing applications.

Key Parameters

Parameter	Value
Current Rating	750 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
Approval Agencies	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (750 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and physical dimensions (5mm x 20mm). All identified substitutes maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and operating temperature ranges do not preclude substitution when the primary functional parameters remain identical. Substitute parts are grouped by manufacturer and product status, with active components prioritized over obsolete alternatives.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Product Status	Approval Agency
0034.3985	SCHURTER Inc.	0.75	250	Slow Blow	5mm x 20mm	35	7.99	Obsolete	CSA, UL
0034.3773	SCHURTER Inc.	0.75	250	Slow Blow	5mm x 20mm	35	5.54	Active	cULus
0239.750MXP	Littelfuse Inc.	0.75	250	Slow Blow	5mm x 20mm	35	5.425	Active	CE, CSA, KC, UL
0239.750TXP	Littelfuse Inc.	0.75	250	Slow Blow	5mm x 20mm	35	5.425	Active	CE, CSA, KC, UL
0239.750VXP	Littelfuse	0.75	250	Slow Blow	5mm x 20mm	35	5.425	Active	CE, CSA, KC, UL
5TT 750-R	Bel Fuse Inc.	0.75	250	Slow Blow	5mm x 20mm	100	5.25	Active	CE, CSA, cULus
0239.750HXP	Littelfuse Inc.	0.75	250	Slow Blow	5mm x 20mm	35	5.425	Active	CE, CSA, KC, UL
BK/GMD-750-R	Eaton - Electronics Division	0.75	250	Slow Blow	5mm x 20mm	35	4.7	Active	CSA, UL
BK1/GMD-750-R	Eaton - Electronics Division	0.75	250	Slow Blow	5mm x 20mm	35	4.7	Active	CSA, UL
GMD-750-R	Eaton - Electronics Division	0.75	250	Slow Blow	5mm x 20mm	35	4.7	Active	CSA, UL
TSC-750MA	OptiFuse	0.75	250	Slow Blow	5mm x 20mm	100	0.835	Active	cULus, UL 248

Engineering Selection Recommendations

All identified substitute parts are active products with current manufacturing status, eliminating supply chain risk associated with the obsolete 0034.3985. Selection among substitutes should prioritize components with certifications matching the original application requirements. SCHURTER 0034.3773 provides direct manufacturer continuity with cULus approval and extended operating temperature range (-40°C to 85°C). Littelfuse 0239.750MXP, 0239.750TXP, and 0239.750VXP offer multi-agency certification (CE, CSA, KC, UL) with broader temperature performance (-55°C to 125°C). Bel Fuse 5TT 750-R and OptiFuse TSC-750MA provide higher breaking capacity (100 A) with active product status. Eaton GMD series components (BK/GMD-750-R, BK1/GMD-750-R, GMD-750-R) maintain CSA and UL compliance with lower melting I²t values (4.7). All substitutes are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0034.3985 be directly replaced with any of these substitute parts?

A: Yes. All identified substitutes maintain the core electrical specifications (750 mA, 250 V AC, slow-blow response) and physical dimensions (5mm x 20mm). Direct mechanical and electrical interchangeability is confirmed for all listed alternatives.

Q: What is the significance of different melting I²t values among substitutes?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations (ranging from 0.835 to 7.99 across the product range) reflect different fuse element designs but do not affect substitution eligibility when current and voltage ratings remain identical. The original 0034.3985 has a melting I²t of 7.99; lower values in active substitutes indicate more responsive thermal characteristics while maintaining the same nominal current rating.

Q: Are there differences in breaking capacity among substitutes?

A: Yes. The original 0034.3985 and most substitutes have a breaking capacity of 35 A. However, Bel Fuse 5TT 750-R and OptiFuse TSC-750MA feature 100 A breaking capacity. Higher breaking capacity does not preclude substitution and may provide enhanced protection in applications subject to higher fault currents.

Q: Which substitute offers the widest operating temperature range?

A: Littelfuse 0239.750MXP, 0239.750TXP, and 0239.750VXP, along with Bel Fuse 5TT 750-R and OptiFuse TSC-750MA, all operate across -55°C to 125°C. The original 0034.3985 does not specify an operating temperature range. SCHURTER 0034.3773 operates from -40°C to 85°C.

Q: What certifications should I prioritize for my application?

A: Certification selection depends on end-use requirements. CSA and UL certifications (present on the original part) are maintained by SCHURTER 0034.3773, Eaton GMD series, and all Littelfuse variants. Multi-agency certification (CE, CSA, KC, UL) is available through Littelfuse 0239.750MXP, 0239.750TXP, and 0239.750VXP for applications requiring broader international compliance.

Q: Is the 5mm x 20mm form factor standardized across all substitutes?

A: Yes. All substitutes conform to the 5mm x 20mm cartridge fuse standard. Physical dimensions are 0.205" diameter x 0.787" length (5.20mm x 20.00mm) for all parts except Bel Fuse 5TT 750-R, which measures 0.201" diameter x 0.787" length (5.10mm x 20.00mm). Both dimensions are compatible with standard 5x20mm fuse holders.

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