ABOUT FUSE TUBE

Company profile and manufacturing base

Tianze Electrical Co., Ltd. was founded in 1983 as Tongxiang Shimen Electrical Factory, in Shimenwan, Tongxiang, Jiaxing, Zhejiang. The company still manufactures on the same site, now at 78 Xingyuan Road in the Shimen Township Industrial Park, about 120 km from Shanghai and 70 km from Hangzhou, which places the plant inside the Yangtze River Delta supply chain for electrical components.

The works covers about 50 mu of land, roughly 33,000 m², and runs with around 200 production staff. Output is organised around seven product families and more than 500 part configurations rather than one catalogue line: fuse tubes, fuse-link tubes, arc-quenching liners, filament wound and G5/G9 melamine tubes, vulcanized-fibre composite tubes, ceramic-wound and glass-canvas constructions, and kraft-paper insulation sleeves. Inside diameters run from about 5 mm to 800 mm.

Most of the volume is co-development work against a customer drawing. Dimensions, tolerances and performance values are confirmed against your approved drawing before a quotation is issued, and the same drawing governs every repeat order afterwards. Fuse tube testing passed at KEMA in the Netherlands in 1990, and the plant operates an ISO 9001 quality management system.

Customers are fuse, cutout and switchgear manufacturers. Our tubes are specified into assemblies built for ABB, Cooper, Hubbell, Eaton, SIBA and Littelfuse, and into defence-sector programmes. Parts ship to 13 countries and more, among them the United States, Brazil, Canada, Mexico, the United Kingdom, Japan, South Korea, India, Pakistan, Colombia, Thailand and Egypt.

Fuse tube, composite tube and insulation tube manufacturer

Tianze Electrical manufactures custom fuse tubes, composite tubes, electrical insulation sleeves, bushings and machined insulating components. We work from customer drawings, samples and application requirements for fuse, switchgear, motor, transformer, EV and photovoltaic projects.

Most of what we make is not a catalog item. A fuse manufacturer needs a liner that quenches an arc at a specific voltage class. A switchgear builder needs a support that will not track. A motor plant needs a bushing that holds a shaft under vibration and heat. Each of those starts from a drawing and a duty, so our job is to turn the print into a part that behaves the same way on the tenth order as it did on the first sample.

Products and processes

• Vulcanized fiber, glass and epoxy wound, ceramic-lined and composite fuse tubes
• G5/G9 melamine, G7 silicone-glass and kraft paper insulation tubes and sleeves
• Cutting, drilling, grinding, threading, slots, tapers and other drawing-based machining
• Prototype samples and repeat production with agreed inspection points

Production is organized by construction rather than by product name. Tubes wound from zinc chloride treated paper are cured, rolled and ground. Tubes built on woven glass cloth are impregnated, wrapped and cured. Composite tubes combine a vulcanized fiber core with a filament wound glass epoxy outer sleeve, which puts the arc-quenching material on the inside and the mechanical strength on the outside. The machining that follows is where most of the variation between orders appears, which is why we quote from your drawing rather than from a datasheet.

Full specifications for every grade are collected on our datasheets and downloads page.

Materials we work in

The grade decides far more than the appearance of the finished part. This is the short version of what each family is good at and where it usually ends up.

Material family	Construction	Strengths	Commonly built into
Vulcanized fiber	Zinc chloride treated paper, wound and cured	Arc quenching, machinability, mechanical toughness	Fuse cartridges, cutout liners, bushings, grommets
G5/G9 melamine	Woven glass cloth with melamine resin	Dimensional stability, arc and caustic resistance	Switchgear supports, slot wedges, arc barriers
Glass epoxy, filament wound	Alkali free glass fiber wound with epoxy resin	Tensile and burst strength, low water absorption	Arrester sleeves, link sticks, earth sticks
Composite fiber and glass epoxy	Glass epoxy wound over a vulcanized fiber core	Arc quenching inside, mechanical strength outside	Expulsion fuse tubes, high voltage cutouts
G7 silicone glass	Glass cloth with a silicone resin binder	Heat and arc resistance, dielectric stability	Furnace insulation, welding tip insulators, washers
Kraft paper	Multilayer insulating kraft paper, dipped and dried	Electrical insulation, strength, wear resistance	Motor end insulation, shaft spacers

How we support engineering buyers

An inquiry reaches an engineer, not a sales counter. Our review covers material grade, dimensions, tolerances, electrical duty, operating temperature, assembly interfaces and the documents you need. We identify missing inputs before a price is issued, not after an order is placed. The points we confirm before production are:

• Grade and construction agreed against your drawing
• Inside diameter, outside diameter, wall thickness and length tolerances that the selected grade can actually hold
• Machining features read from the print, including threads, slots, tapers and knurling
• Documentation list fixed at quotation instead of negotiated after shipment
• Sample approval route and inspection points defined for repeat orders

From drawing to delivery

Repeat orders stay on the approved drawing, so what is agreed at the sampling stage is what the shop floor repeats.

Stage	What happens	What you receive
Inquiry review	Drawing, duty and quantity checked for manufacturability	Quotation with tooling cost and lead time stated up front
Sampling	Prototype or trial quantity produced on production equipment	Physical samples for fit and dielectric evaluation
Approval	Drawing, grade and inspection points frozen	Approved specification held against your part number
Repeat production	Batch produced to the approved specification	Goods with the agreed inspection records

Quality and documentation

Our plant operates an ISO 9001 quality management system, and SGS material testing is available for the constructions you specify. State the exact documents required in your RFQ, such as material certificates, dimensional inspection reports, test reports, retention samples or packaging records. RoHS and REACH declarations can be supplied on request.

Compliance and performance are confirmed only against the approved material, drawing and test plan. If a specification has to be verified to a standard, say which standard in the inquiry and it is written into the quotation rather than assumed.

Drawing confidentiality

Mark confidential drawings and specifications when submitting an inquiry. If a separate confidentiality agreement or a controlled document process is required, request it before sharing restricted information. We can hold your drawing against a part number and keep it out of general circulation.

Why work with a direct manufacturer

Procurement teams often hit the same walls with fuse-tube suppliers: minimum order quantities that force surplus stock, sampling lead times measured in weeks, wall-thickness drift between batches, and certification paperwork that arrives late or not at all. Because we manufacture these tubes in our own plant, we quote against your actual volume, turn samples quickly, hold tolerances to the drawing, and supply the documents your incoming inspection requires.

• Factory-direct pricing with no trading-company markup
• Low minimum order and fast sampling against your drawing
• Custom inside diameter, outside diameter, wall thickness, length, color and machining per specification
• ISO 9001 quality system with SGS material testing available
• RoHS and REACH compliance documents on request
• RFQ answered by an engineer, typically within one working day

More questions buyers ask

What is your minimum order quantity and sampling policy?
Trial and prototype quantities are accepted. Standard-specification samples are available quickly for evaluation. Custom geometries that require new tooling are quoted with the tooling cost and lead time stated up front.

Which quality certifications do you hold?
Our plant operates an ISO 9001 quality management system, and SGS material testing is available for the constructions you specify. RoHS and REACH compliance documents can be supplied on request for your incoming inspection.

Can you match a grade we already use?
Usually yes. Send the grade designation, the standard it is called out against, and a drawing or sample, and we will confirm the closest equivalent construction and where it differs. Where a direct match is not practical, we will say so and propose the nearest grade that meets the duty.

What should the RFQ include?
Grade or intended duty, inside diameter, outside diameter, wall thickness and length with tolerances, quantity, the documents required with the goods, and the drawing. Voltage class and breaking capacity matter for fuse parts because they constrain the wall thickness and the arc-quenching material.

How fast do you respond to a technical enquiry?
Engineering reviews are answered within one working day. A full quotation follows once we have reviewed your drawing, voltage class and required quantity.

Start a project

Review our fuse tubes, composite tubes and electrical insulation tubes, then send your drawing and RFQ. Datasheets for the common grades are on the downloads page, and you can also write to sale@fusestube.com.