MST 250 FUSE T 63MA (0034.6803) Equivalent & Substitute Parts

Part Overview

The SCHURTER MST 250 FUSE T 63MA (0034.6803) is a 63 mA, 250 V AC board mount fuse with slow blow response characteristics, designed for through hole radial mounting in vertical orientation. This active product is widely used in electronic equipment requiring overcurrent protection at low current levels. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

0034.6803

SCHURTER Inc.In Stock: 10430034.6803 Datasheet

Current PartRFQ

37200630001

Littelfuse Inc.In Stock: 313037200630001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MST 250 FUSE T 63MA are identified based on the following critical parameters that determine functional equivalence:

• Current Rating: 63 mA (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

The Littelfuse TR5® 372 series part 37200630001 meets all critical substitution criteria. Minor variations in operating temperature range, melting I²t values, and physical dimensions within tolerance do not preclude functional equivalence in applications where the main part is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the SCHURTER MST 250 FUSE T 63MA and the Littelfuse TR5® 372 series part 37200630001 are active products with ROHS3 compliance and multi-agency approvals (CCC, cURus, VDE). Selection between these parts should be based on:

• Availability and lead time requirements
• Specific approval agency requirements for the end application (note: SCHURTER includes KC approval; Littelfuse includes SEMKO approval)
• Operating temperature range constraints (SCHURTER supports -55°C ~ 125°C; Littelfuse supports -40°C ~ 85°C)
• Physical dimension tolerance requirements (height difference of 0.020" / 0.50mm)
• Melting I²t specification requirements for the application circuit

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37200630001 be used as a direct replacement for the SCHURTER 0034.6803?

A: Yes, the Littelfuse 37200630001 is functionally equivalent for applications requiring 63 mA, 250 V AC slow blow fuse protection with through hole radial board mount configuration. Verify that the operating temperature range (-40°C ~ 85°C for Littelfuse versus -55°C ~ 125°C for SCHURTER) and melting I²t characteristics (0.0278 versus 0.05) are acceptable for your specific application.

Q: What are the critical parameters that must match for substitution?

A: Current rating (63 mA), AC voltage rating (250 V), response time (slow blow), mounting type (through hole), package style (radial, can, vertical), and fuse type (board mount, cartridge style excluded) must all match exactly. These parameters define the protective function and physical compatibility.

Q: Are there dimensional compatibility concerns?

A: The diameter is identical (0.335" / 8.50mm), but the height differs slightly (0.335" L for SCHURTER versus 0.315" H for Littelfuse, a 0.020" / 0.50mm difference). Verify that PCB layout and component clearances accommodate this variation.

Q: What approval agencies certify these parts?

A: SCHURTER 0034.6803 carries CCC, cURus, KC, and VDE approvals. Littelfuse 37200630001 carries CCC, cURus, SEMKO, and VDE approvals. Confirm that your application requirements align with the specific certifications needed.

Q: How do the melting I²t values affect substitution?

A: The melting I²t value (0.05 for SCHURTER; 0.0278 for Littelfuse) indicates the thermal energy required to melt the fuse element. The Littelfuse part has a lower I²t, meaning it will respond faster to thermal stress. Verify that circuit protection characteristics remain appropriate for your application.