MQ 200 Equivalent & Substitute Parts

Part Overview

The MQ 200 is a 200 mA board mount axial fuse rated for 125 V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and procurement planning. The MQ 200 series fuse is designed for through-hole mounting applications requiring fast-blow response characteristics and compact axial packaging.

Substiute Parts

MQ 200

Bel Fuse Inc.In Stock: 1067MQ 200 Datasheet

Current PartRFQ

0251.200MXL

Littelfuse Inc.In Stock: 42870251.200MXL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MQ 200 is determined by strict equivalence across the following critical parameters:

• Current Rating: 200 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (both must be met)
• Response Time: Fast Blow (functional characteristic)
• Mounting Type: Through Hole (mechanical requirement)
• Fuse Type: Board Mount, Axial configuration (form factor)
• Breaking Capacity: 50A AC, 300A DC (performance specification)
• Operating Temperature: -55°C ~ 125°C (environmental specification)

The 0251.200MXL from Littelfuse Inc. meets all these criteria, establishing it as a direct functional equivalent for the obsolete MQ 200.

Parameter Comparison

Engineering Selection Recommendations

The 0251.200MXL (Littelfuse PICO® II 251 series) is the direct equivalent for the obsolete MQ 200. Selection of this substitute is supported by:

• Identical electrical specifications across current, voltage, and response characteristics
• Matching mechanical form factor and through-hole mounting compatibility
• Active product status ensuring ongoing availability and supply chain continuity
• CSA and cURus certifications maintaining compliance requirements
• Dimensional compatibility within acceptable tolerances for board mount applications

The minor variations in physical diameter (0.110" vs 0.125") and DC cold resistance (0.895 Ohms vs 1 Ohm) do not affect functional equivalence in standard board mount circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 0251.200MXL directly replace the MQ 200 in existing designs?

A: Yes. The 0251.200MXL meets all critical electrical and mechanical parameters required for direct substitution. Both components share identical current ratings, voltage ratings, response time, mounting type, and breaking capacity specifications.

Q: What is the significance of the dimensional difference between the two parts?

A: The MQ 200 has a 0.125" diameter while the 0251.200MXL has a 0.110" diameter. Both maintain the same 0.280" length. This dimensional variation is within acceptable tolerances for through-hole axial fuse mounting and does not impact electrical performance or board compatibility.

Q: Are there compliance differences between the MQ 200 and 0251.200MXL?

A: The MQ 200 carries CE, CSA, and cURus approvals. The 0251.200MXL carries CSA and cURus approvals. Both meet the primary safety certifications required for board mount fuse applications. Verify specific regulatory requirements for your application if CE marking is mandatory.

Q: How do the DC cold resistance values affect substitution?

A: The MQ 200 has 1 Ohm DC cold resistance while the 0251.200MXL has 0.895 Ohms. This minor difference does not affect circuit protection function or thermal performance in standard applications. Both values are within acceptable ranges for fast-blow fuses in this current class.

Q: Is the 0251.200MXL available in the same packaging as the MQ 200?

A: The MQ 200 is available in bulk packaging. The 0251.200MXL is supplied in bulk packaging. Both use axial form factor suitable for through-hole board mount installation.