Uchihashi Estec

What Uchihashi Estec does

Uchihashi Estec Co., Ltd. (内橋エステック株式会社) is a privately held Japanese manufacturer specializing in thermal fuses (温度ヒューズ / thermal links) and solder products, operating out of Osaka with approximately 100 years of heritage dating to its founding around 1925. The company develops and manufactures fusible alloy-based thermal protection components that permanently interrupt electric circuits when ambient temperatures exceed calibrated thresholds. Its core technology centers on a proprietary construction in which a low-melting-point fusible alloy element — typically surrounded by a rosin-based special resin — is sealed inside a ceramic tube with epoxy at both ends, providing hermetic, non-resetting overheat protection with stable long-term characteristics. The portfolio spans three primary thermal-fuse form factors (axial, radial, and pellet) along with derived assemblies including fuse resistors (thermal fuse + resistor), thermoprotectors with resistor elements for PCB mounting, and high-current battery fuses. Solder products (lead-free and lead-containing bar/wire solder, rosin-core solder, solder fiber/ribbon, low-temperature solder, solder paste, and fluxes) constitute the second product line, served through the same direct B2B channels.

The company monetizes its portfolio exclusively through hardware sales under an inquiry-based quoting model — pricing is not published and customers procure samples and quotations through website contact forms. Go-to-market is enterprise-direct, anchored by participation in major Japanese trade shows (Nepcon Japan, Manufacturing World Osaka) and a multi-language corporate website (Japanese, English, Chinese, Korean) that supports international inquiries. Distribution is handled through regional sales representatives, with no third-party e-commerce or channel-partner model in evidence. Customer segments span electronics manufacturers, automotive electronics suppliers (with AEC-Q200-qualified parts for onboard chargers, traction inverters, and DC/AC inverters), battery and energy storage system builders (with second-protection and overcharge-prevention fuses), and consumer appliance OEMs (heating blankets, electric carpets, toilet seat heaters, ADAS camera defog heaters). The company holds an unusually broad certification footprint — UL (multiple file numbers across series), AEC-Q200, PSE, C-UL, KC, and RoHS2 — which materially shortens customer qualification cycles and underpins its global market access.

From 2023 onward, product development has accelerated into DC-rated and high-current product families (R4, P4, R7 thermal links rated to DC450V; KC and KB micro fuses at DC450V; BW12 at 265A and BW21 at 480A; BZ08 signal fuses at DC400V/30A; and ultra-thin ETR/E2 series at 1.1mm profile) explicitly targeting EV power electronics, DC heaters, DC/DC converters, and lithium-ion battery packs. This pivot positions the company to participate in the EV and energy-storage growth markets while continuing to serve its legacy AC consumer-appliance and electronics-manufacturing customer base. Operating status remains active as of 2025, with continuous website maintenance, regular trade-show participation, and ongoing product introductions.

Name

Uchihashi Estec

Legal name

内橋エステック株式会社 (Uchihashi Estec Co., Ltd.)

Website

https://uchihashi.co.jp

Company type

Private

Founded year

1925

Operating status

Operating

Headcount range

11–50 employees

Short description

Uchihashi Estec is a privately held Japanese manufacturer of fusible alloy thermal fuses and solder products, operating since approximately 1925. It serves electronics, automotive, battery/energy storage, and consumer-appliance manufacturers globally through direct B2B sales and trade-show channels.

Ownership category

akta.pro rank

Product category

Electronic Components

NAICS

Relay and Industrial Control Manufacturing (335314)

SIC

Electrical Industrial Apparatus (3620)

akta.pro primary industry

Thermal Management Components (Heat sinks, TIMs, fans/blowers, thermal pads) (IMAGAJAL)

Keywords

• Thermal fuses
• Fuse resistors
• Solder products
• Circuit protection
• Thermal protection

Headquarters

HQ city

Tsurumi

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Thermal Fuse Products: Manufacture and sale of temperature fuses (thermal links) including axial, radial, and pellet types for overheat protection in electronics, automotive, and industrial applications.
2. Fuse Resistor Products: Manufacture and sale of fuse resistors combining thermal fuses with resistors for overcurrent and overtemperature protection in power supply and battery applications.
3. Solder Products: Manufacture and sale of solder products including lead-free bar/wire solder, rosin-core solder, solder paste, and fluxes for electronics manufacturing.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels2 records

Core offering

Uchihashi Estec manufactures and sells thermal fuses (temperature fuses/thermal links), fuse resistors, and solder products for the electronics, automotive, and battery protection industries. Their thermal fuses use proprietary fusible alloy technology sealed in ceramic tubes with epoxy resin to permanently interrupt circuits at predetermined temperatures, serving as non-resetting overheat protection in electronic equipment, DC power systems, and lithium-ion battery packs.

Product overview

Uchihashi Estec (内橋エステック株式会社) is a manufacturer of solder products and thermal protection components with approximately 100 years of experience. The company operates two main product lines: (1) Solder Products including lead-free bar/wire solder, lead-containing solder, rosin-core solder, solder fiber/ribbon, low-temperature solder, solder paste, and flux products; and (2) Thermal Fuse Products (温度ヒューズ) for overheat protection in electronic equipment. The thermal fuse product portfolio includes multiple series variants across three form factors—axial type (12, 17, 22, 27, 32, 36, 37, 44, 47, 6, CR, K□F, T□F, T□X, V□F, Y□F, L□F, T6D), radial type (X, U2, S, H, SK, SC, NC, N□F, N□X, H□F, H□X, HU□X, E□F, E□X), and pellet type (LE□)—as well as fuse resistor assemblies (A5MC, A2JD, Y5JA, F1K, F2K, F5K, F7K, P7K, P10K), resistance temperature fuses (F2R, P2R), thermoprotectors with resistors (EC, EC-T), and husing registers (BZ05, BZ07, BZ11). The company also offers DC-focused concept models including R4, P4, and R7 series for emerging DC power applications. New products include micro fuses (KC, KB series), battery fuses (BZ08, BW12, BW21, FM), and the A10HB high-heat-resistant fuse resistor for automotive applications.

Differentiator

Problem solved

Functional benefit

Brands

• ELCUT: Product brand for thermal links and thermoprotectors

Products and services

• Solder Products (はんだ製品) Solder products including lead-free bar/wire solder, lead-containing bar solder, ultra-fine wire rosin-core solder, solder fiber/ribbon, low-temperature solder, solder paste, hyper flux, and nespar flux products for electronics manufacturing.
• Thermal Fuse Products (温度ヒューズ製品) Temperature fuse (thermal link) products for overheat protection, including axial type, radial type, and pellet type thermal fuses with various series ratings, for use in electronics, automotive, and industrial applications.
• Fuse Resistors (ヒューズ抵抗器) Fuse resistor assemblies combining thermal fuses with resistor elements including A5MC, A2JD, Y5JA, F1K, F2K, F5K, F7K, P7K, P10K series, as well as F2R and P2R resistance temperature fuses integrating alloy thermal fuses with 2W wire-wound resistors for combined overheat and overcurrent protection.
• Thermoprotectors with Resistor (抵抗体付サーモプロテクタ) EC and EC-T series thermoprotectors combining thermal fuses and resistors on PCB, designed for lithium-ion secondary battery protection circuits with 1.1mm ultra-thin thickness and 12A current rating.
• DC Concept Models (DCコンセプトモデル) New DC-focused thermal fuse and fuse products including R7, R4, and P4 series for DC applications such as DC heaters, DC/DC converters, DC appliances, capacitors, chargers, and DC power supply equipment.
• Battery Fuses (電池用ヒューズ) Second protection and signal fuses for batteries including BZ08, BW21, BW12, and FM models for lithium-ion battery protection in automotive batteries, storage modules, AGV, electric motorcycles, and small EVs.
• Micro Fuses (マイクロヒューズ) Micro fuses including KC and KB series with compact size (10mm or less body side), high voltage DC ratings up to 450V, reflow soldering compatible, for DC motors, DC-DC converters, battery packs, DC power supply modules, and FA equipment.

Quantifiable outcome

• DC450V rating achieved in P4 series fusible alloy thermal fuses for high-voltage DC applications
• +4 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Bourns: Bourns manufactures circuit protection components including thermal fuses, PTC resettable fuses, and fuse resistors. It competes with Uchihashi Estec in thermal fuse and overcurrent/over-temperature protection for automotive and electronics applications.
• Littelfuse: Littelfuse is the world's largest manufacturer of fuses and circuit protection, offering a broad range of thermal fuses, PTC devices, and battery protection fuses. It directly competes with Uchihashi Estec in thermal fuse and battery protection fuses, particularly in automotive and industrial end markets.
• SEMITEC Corporation: SEMITEC is a Japanese manufacturer of temperature sensors and thermal fuses (e.g., FT/GT series), directly competing with Uchihashi Estec in the same Japanese-Japanese thermal protection market for electronics and automotive applications.
• Schurter: Schurter is a Swiss manufacturer of fuses, circuit breakers, and connectors, including thermal fuses for equipment protection. It is a directly comparable fuse manufacturer serving similar industrial, automotive, and consumer applications.
• Bel Fuse: Bel Fuse designs and manufactures circuit protection products including fuses and resettable PTCs for power, telecommunications, and automotive applications. It is a direct peer in fuse-based circuit protection where Uchihashi also competes.
• AEM Components: AEM Components manufactures solid-matrix fuses and surface-mount fuse products for automotive, battery, and industrial applications. It is a direct competitor in automotive and battery circuit protection, where Uchihashi's BW21 and BW12 also compete.

Broad incumbents

• Eaton (Bussmann): Eaton's Bussmann series covers industrial and automotive fuses and circuit protection. As a broad incumbent, it overlaps with Uchihashi in industrial and EV/battery protection but does not specialize in the niche of fusible alloy thermal links.
• Mersen: Mersen manufactures fuses and electrical protection solutions for industrial and EV power electronics. It is a broader incumbent in fuse-based protection, serving automotive and industrial end markets similar to Uchihashi's.
• SCHOTT (SEFUSE): SCHOTT's SEFUSE brand is a long-standing thermal fuse product line, directly comparable to Uchihashi's ELCUT thermal links. As part of the larger SCHOTT group, it is a broad incumbent with global reach in the thermal fuse category.
• Panasonic Electronic Components: Panasonic's electronic components division includes thermal fuses (POSISTOR) and a wide range of circuit protection devices. It is a broad incumbent that competes with Uchihashi in Japanese and global thermal protection markets as part of a much larger portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/uchihashi-estec-co-ltd-

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about Uchihashi Estec