What Bel Fuse does

Bel Fuse Inc. is a U.S.-headquartered (Jersey City, New Jersey) designer and manufacturer of electronic components founded in 1949 and publicly traded on NASDAQ under BELFA and BELFB. The company produces a broad portfolio spanning circuit protection devices (fuses, PTC resettable fuses), magnetics (common mode chokes, SMD and through-hole inductors, ferrite beads, charging coils), Ethernet connectivity (MagJack integrated connector modules, magnetic modules, SFP copper transceivers), power supplies (AC-DC converters, DC-DC converters, DC-AC inverters, battery chargers, power shelves and racks spanning 3W to 25kW outputs and supporting 12V/48V data center architectures), and transformers (POE, single-phase, three-phase, autotransformers, SMPS, current sense). Product brands include Cinch Connectivity Solutions, CUI Inc, EOS Power, Melcher, Signal Transformer, MilPower Source, Enercon Technologies, and dataMate.

Bel Fuse serves eight end markets — Aerospace & Defense, Industrial Technology & Data Solutions (including networking and data centers), EV/eMobility, Medical, Railway, Industrial automation, Networking & Data Centers, and Consumer & IoT. Following a March 2026 organizational realignment, the company operates two business units: Aerospace, Defense & Rugged Solutions, and Industrial Technology & Data Solutions. Aerospace and defense revenue exposure grew to 31% of total revenue after the November 2024 acquisition of an 80% stake in Enercon Technologies for $320 million; the March 2026 acquisition of dataMate added approximately $18 million in annual Ethernet/broadband sales for $16 million.

Bel Fuse generates revenue through hardware sales via a hybrid model combining global authorized distributors and direct enterprise sales with quote-based (RFQ) pricing for volume and custom orders. FY2025 net sales were $675.5 million (up 26.3% YoY), with Q1 2026 net sales of $178.5 million (up 17.2% YoY) and gross margin improving to 39.0%. Marketing channels include industry trade shows (electronica China, electronica India, InnoTrans), a technical resource library with CAD models and competitor cross-reference tools, and distributor stock-check integration.

Name

Bel Fuse

Legal name

Bel Fuse Inc.

Website

https://belfuse.com

Company type

Public

Founded year

1949

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

Bel Fuse designs and manufactures electronic components — circuit protection, magnetics, power supplies, Ethernet connectivity, and transformers — for enterprise customers in aerospace, defense, industrial, data center, medical, railway, and EV/eMobility markets, distributing globally via direct sales and authorized distributors.

Ownership category

akta.pro rank

Product category

Electronic Components Manufacturing

NAICS

Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing (334416), Power, Distribution, and Specialty Transformer Manufacturing (335311), Electrical Equipment Manufacturing (33531), Other Electronic Component Manufacturing (334419)

SIC

Electronic Coils, Transformers & Other Inductors (3677), Power, Distribution & Specialty Transformers (3612), Electronic & Other Electrical Equipment (No Computer Equip) (3600), Electronic Components, Nec (3679)

akta.pro primary industry

Passive Components (Resistors, Capacitors, Inductors, Ferrites) (IMAGAJAA)

akta.pro secondary industries

Circuit Protection Devices (MCBs, MCCBs, ACBs, fuses, RCD/GFCI, surge protection) (IMAGAEAB), EMI/EMC & Filtering Components (Common-mode chokes, filters, shielding materials) (IMAGAJAN), Inductors & Coils (Power/RF/Chokes) (HDAHANAC)

Keywords

• Power conversion solutions
• Circuit protection components
• Magnetic components inductors
• Ethernet connectivity modules
• Electronic component manufacturing

Headquarters

HQ city

Jersey City

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Electronic Components Sales: Bel Fuse designs, manufactures, and markets electronic components including circuit protection devices, power supplies, magnetic components, and connectivity solutions sold directly and through distributors to defense, aerospace, industrial, networking, telecommunications, consumer, medical, railway, and EV/eMobility customers. The company reported FY2025 net sales of $675.5 million, a 26.3% increase from $534.8 million in FY2024.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

Bel Fuse designs and manufactures electronic components that protect, convert, and connect electronic circuits, including circuit protection devices (fuses, PTC resettable fuses), magnetic components (common mode chokes, SMD and through-hole inductors, ferrite beads, charging coils), Ethernet connectivity products (MagJacks ICMs, magnetic modules, SFP copper transceivers), power supplies (AC-DC converters, DC-DC converters, DC-AC inverters, battery chargers, power shelves and racks, desktop and wall plug adapters), and transformers (POE, single phase, three phase, autotransformers, SMPS, current sense). The portfolio spans outputs from 3W to 25kW and serves mission-critical environments including aerospace, defense, railway, medical, EV/eMobility, industrial automation, and networking/data center applications.

Differentiator

Problem solved

Functional benefit

Brands

• CUI Inc: Connectivity solutions brand
• EOS Power
• Melcher
• Signal Transformer
• Cinch Connectivity Solutions
• MilPower Source

Products and services

• Circuit Protection Products

Quantifiable outcome

• Revenue increased 26.3% to $675.5 million in FY2025 from $534.8 million in FY2024
• +4 more outcomes

Named customers1 record

Segments8 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators13 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Bourns, Inc. Privately held manufacturer of circuit protection devices, inductors, transformers, and resistive products. Closely overlaps Bel Fuse's magnetics and circuit protection product lines serving industrial, automotive, and communications customers.
• Littelfuse, Inc. Public global supplier of circuit protection (fuses, PTCs, surge protection), power control, and sensing products. Directly comparable to Bel Fuse's Circuit Protection product family across automotive, industrial, and electronics customers.
• Vishay Intertechnology, Inc. Public manufacturer of discrete semiconductors and passive components including resistors, inductors, transformers, and magnetics. Overlaps Bel Fuse's magnetics and component portfolio in industrial, automotive, defense, and computing.
• Vicor Corporation: Public US-based manufacturer of high-density power conversion modules (AC-DC, DC-DC) targeting data center, defense, and industrial applications. Closely comparable to Bel's power supply and converter portfolio at the high-power-density end.
• Advanced Energy Industries, Inc. Public precision power conversion provider serving semiconductor, data center, medical, and industrial customers. Overlaps Bel's AC-DC/DC-DC and high-reliability power supply offerings, especially for data center and industrial applications.
• Pulse Electronics (Yageo Corporation): Manufacturer of transformers, inductors, and connectivity magnetics for automotive, networking, and industrial markets; now part of Yageo. Closely matches Bel Fuse's Signal Transformer, transformer, and MagJack/magnetic module product lines.

Broad incumbents

• TDK Corporation: Global Japanese electronic components leader with a broad portfolio in capacitors, inductors, transformers, EMI filters, and power solutions. Significantly larger than Bel, but with overlapping magnetics and circuit protection product lines.
• Murata Manufacturing Co., Ltd. World's largest passive component maker, dominant in MLCCs, inductors, EMI/RFI filters, and power modules. Directly competes with Bel Fuse in inductors and common-mode chokes across communications and industrial markets.
• Eaton Corporation plc: Global power management giant offering circuit protection, power supplies, transformers, and connectivity across industrial, data center, and aerospace/defense markets. Overlaps with Bel Fuse's rugged, industrial, and power supply portfolio at scale.
• TE Connectivity plc: Global leader in connectors, sensors, and magnetics for automotive, industrial, aerospace, and data communications. Comparable to Bel Fuse on the Cinch Connectivity and MagJack/SFP copper transceiver side, though at significantly greater scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/belrgreenberg
• Facebookfacebook.com/belpowersolutions

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries8 records

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A19 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Bel Fuse