SEH 30A 125V (G) Equivalent & Substitute Parts

Part Overview

The SEH 30A 125V (G) is a surface mount board mount fuse manufactured by Conquer, rated for 30 A at 125 V AC and 100 V DC. This component is designed for circuit protection in applications requiring fast-acting fuse characteristics with a 2-SMD square end block package configuration. The part maintains Active product status with 3283 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary manufacturer part becomes unavailable or when supply chain optimization is required.

Substiute Parts

SEH 30A 125V (G)

ConquerIn Stock: 3388SEH 30A 125V (G) Datasheet

Current PartRFQ

SF-3812FG3000T-2

Bourns Inc.In Stock: 3180SF-3812FG3000T-2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SEH 30A 125V (G) are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Electrical Parameters (Must Match Exactly):

• Current Rating: 30 A
• Voltage Rating - AC: 125 V
• Voltage Rating - DC: 100 V
• Breaking Capacity @ Rated Voltage: 100A AC, 100A DC
• Melting I²t: 101
• DC Cold Resistance: 0.0016 Ohms

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Surface Mount
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Package / Case: 2-SMD, Square End Block
• Size / Dimension: 0.398" L x 0.122" W x 0.122" H (10.10mm x 3.10mm x 3.10mm)

Environmental Parameters (Must Match Exactly):

• Operating Temperature Range: -55°C ~ 125°C

Only parts meeting all specified parameters are listed as direct substitutes. No parameter deviation is permitted for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Part - SEH 30A 125V (G): The SEH 30A 125V (G) maintains Active product status with substantial inventory availability (3283 units). This part carries cURus approval certification. RoHS compliance status requires inventory verification. The part is suitable for immediate deployment in applications meeting the specified electrical and thermal parameters.

Substitute Part - SF-3812FG3000T-2: The SF-3812FG3000T-2 from Bourns Inc. is a direct parametric equivalent meeting all electrical, mechanical, and environmental specifications. This part carries dual certification (cUL and UL) and is ROHS3 Compliant, providing enhanced regulatory documentation. Inventory availability is 3117 units. The substitute part is suitable for applications where Bourns certification or enhanced RoHS compliance documentation is required, or when primary part supply becomes constrained.

Both parts are packaged in Tape & Reel format suitable for automated assembly processes. Selection between primary and substitute parts should be based on supply availability, certification requirements, and inventory status at the time of procurement.

Frequently Asked Questions (FAQ)

Q: What makes SF-3812FG3000T-2 a valid substitute for SEH 30A 125V (G)?

A: The SF-3812FG3000T-2 matches all critical electrical parameters (30 A current rating, 125 V AC / 100 V DC voltage ratings, 100A breaking capacity, 101 melting I²t), mechanical specifications (2-SMD square end block package, identical dimensions of 10.10mm x 3.10mm x 3.10mm), and environmental operating range (-55°C to 125°C). Both parts are surface mount board mount fuses with identical DC cold resistance of 0.0016 Ohms.

Q: Are there any differences between these two parts?

A: The SF-3812FG3000T-2 specifies Fast Blow response time, while the SEH 30A 125V (G) does not specify response time in the provided data. The SF-3812FG3000T-2 carries cUL and UL certifications with ROHS3 compliance documentation, while the SEH 30A 125V (G) carries cURus approval with RoHS status requiring verification. Both differences are documentation-level distinctions; electrical and mechanical performance parameters are identical.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. Both parts share identical package dimensions (0.398" L x 0.122" W x 0.122" H), identical 2-SMD square end block configuration, and identical footprint requirements. No PCB layout modifications are required when substituting between these parts.

Q: What is the significance of the Melting I²t value of 101?

A: The Melting I²t of 101 defines the thermal energy required to melt the fuse element. This parameter, combined with the 30 A current rating and 101 melting I²t value, determines the fuse's response characteristics and protection profile. Both parts share this identical specification, ensuring equivalent circuit protection behavior.

Q: Which part should be selected for new designs?

A: Selection should be based on current supply availability and certification requirements. The SF-3812FG3000T-2 offers documented ROHS3 compliance and dual UL/cUL certification, making it suitable for applications with strict regulatory documentation requirements. The SEH 30A 125V (G) is suitable when cURus certification meets application requirements and inventory availability is prioritized.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both the SEH 30A 125V (G) and SF-3812FG3000T-2 are supplied in Tape & Reel (TR) packaging, suitable for automated pick-and-place assembly processes.