SMM 30 Equivalent & Substitute Parts Reference

Part Overview

The SMM 30 is a 30 A surface mount board mount fuse rated for 250 V AC and 72 V DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SMM 30 features a 2-SMD square end block package with medium blow response characteristics and is suitable for applications requiring reliable overcurrent protection in industrial and commercial electronics.

Substiute Parts

SMM 30

Bel Fuse Inc.In Stock: 1074SMM 30 Datasheet

Current PartRFQ

0678L9200-02

Bel Fuse Inc.In Stock: 668790678L9200-02 Datasheet

DirectRFQ

0678L9300-02

Bel Fuse Inc.In Stock: 1915650678L9300-02 Datasheet

DirectRFQ

0456030.ER

Littelfuse Inc.In Stock: 111550456030.ER Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMM 30 are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications across all critical parameters: 30 A current rating, 250 V AC voltage rating, 72 V DC voltage rating, medium blow response, 2-SMD square end block package, and -55°C to 125°C operating temperature range. These parts are functionally interchangeable with the original SMM 30 in circuit designs.

Similar Substitutes share the same current rating (30 A), DC voltage rating (72 V), mounting type (surface mount), and package form factor (2-SMD square end block), but differ in AC voltage rating or response time characteristics. These parts require circuit-level evaluation to confirm suitability for the intended application.

The following parameters determine substitution eligibility:

• Current Rating (Amps): Must match or exceed application requirement
• Voltage Rating - AC: Must meet or exceed circuit AC voltage specification
• Voltage Rating - DC: Must meet or exceed circuit DC voltage specification
• Mounting Type: Must be Surface Mount
• Package / Case: Must be 2-SMD, Square End Block
• Operating Temperature Range: Must encompass application operating conditions

Parameter Comparison

Engineering Selection Recommendations

0678L9300-02 is the direct equivalent replacement for SMM 30. This part maintains identical electrical ratings (30 A, 250 V AC, 72 V DC), matching response time (medium blow), and identical melting I²t value (1000). The 0678L9300-02 is manufactured by Bel Fuse Inc., carries active product status, and holds AEC-Q200 automotive qualification in addition to cURus approval. This part is ROHS3 compliant and represents the primary substitution path for obsolete SMM 30 applications.

0678L9200-02 is a related Bel Fuse Inc. part with identical voltage ratings and response characteristics but reduced current rating (20 A versus 30 A). This part is suitable only for applications where the circuit current requirement does not exceed 20 A. The 0678L9200-02 carries AEC-Q200 qualification and ROHS3 compliance.

0456030.ER is a Littelfuse Inc. NANO²® 456 series part with matching 30 A current rating and 72 V DC rating but reduced AC voltage rating (125 V versus 250 V). This part features fast blow response (versus medium blow) and significantly lower melting I²t (81 versus 1000), indicating faster fault response. The 0456030.ER is suitable only for circuits operating at 125 V AC or lower and where fast blow characteristics are acceptable. This part holds cULus and PSE approvals with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can 0678L9300-02 be used as a direct replacement for SMM 30?

A: Yes. The 0678L9300-02 maintains identical current rating (30 A), AC voltage rating (250 V), DC voltage rating (72 V), response time (medium blow), package configuration (2-SMD square end block), and melting I²t value (1000). This part is electrically and mechanically equivalent and is the recommended substitution for obsolete SMM 30 applications.

Q: What is the difference between 0678L9200-02 and SMM 30?

A: The 0678L9200-02 has a reduced current rating of 20 A compared to the SMM 30's 30 A rating. Both parts share identical voltage ratings (250 V AC, 72 V DC), response time (medium blow), and package type. The 0678L9200-02 is suitable only for circuits where the maximum current does not exceed 20 A.

Q: Can 0456030.ER replace SMM 30 in all applications?

A: No. The 0456030.ER has a reduced AC voltage rating (125 V versus 250 V) and fast blow response (versus medium blow). This part is suitable only for circuits operating at 125 V AC or lower and where fast response characteristics are acceptable. The significantly lower melting I²t (81 versus 1000) indicates faster fault detection and response.

Q: What packaging options are available for substitute parts?

A: The 0678L9200-02 is supplied in Tape & Reel (TR) packaging. The 0678L9300-02 is available in Cut Tape (CT) and Digi-Reel® packaging. The 0456030.ER is supplied in Cut Tape (CT) and Digi-Reel® packaging. All parts maintain the same 2-SMD square end block form factor suitable for surface mount assembly.

Q: Are all substitute parts RoHS compliant?

A: The 0678L9200-02, 0678L9300-02, and 0456030.ER are all ROHS3 compliant. The original SMM 30 RoHS status is not specified in available documentation.

Q: What certifications do the substitute parts carry?

A: The 0678L9300-02 carries AEC-Q200 automotive qualification and cURus approval. The 0678L9200-02 carries AEC-Q200 and cURus approval. The 0456030.ER carries cULus and PSE approvals. All parts are REACH unaffected and classified as EAR99 for export control purposes.