Tonyhoo Cable Accessories: Manufacturer Profile & Product Guide

Last updated: October 2026

When sourcing cable accessories for power distribution projects, buyers need a supplier with proven manufacturing capability, a broad product portfolio, and a clear understanding of application requirements. This article provides an in-depth profile of Ningbo Tonyhoo Electrical Technology Co., Ltd., a Chinese manufacturer specializing in cable accessories since 1997. We examine the company's history, product lines, technical specifications, manufacturing strengths, and market position, offering procurement professionals a factual reference for supplier evaluation.

Problem Definition: The Challenge of Selecting Cable Accessories

Cable accessories—including terminations, joints, connectors, and protective housings—are critical components in medium- and low-voltage power networks. They provide insulation, electric stress control, and sealing to ensure safe and reliable cable connections. However, the market offers a wide range of products with varying quality, certification, and compatibility. Buyers must navigate technical specifications, installation requirements, and supplier reliability. Poorly chosen or improperly installed accessories can lead to insulation failure, short circuits, and costly downtime. This is particularly true for outdoor installations exposed to rain, UV, salt fog, and temperature fluctuations.

Industry Background: Cable Accessories Market Trends

The global cable accessories market was valued at USD 35.84 billion in 2025 and is projected to reach USD 37.88 billion in 2026, according to Global Market Insights (GMI). The Asia Pacific region represents the largest and fastest-growing market, driven by grid modernization and renewable energy projects. Within this broad category, cold shrink tubing alone accounted for USD 2.38 billion in 2024, while the heat shrink cable accessories segment reached USD 2,113.7 million in the same year. These figures underscore the scale and ongoing demand for reliable cable accessory solutions.

Standards also play a key role. IEEE 1816-2024 provides industry practices for preparing shielded cables up to 46 kV for mating accessories, emphasizing the importance of proper installation procedures. Suppliers must therefore offer products that meet relevant standards and support correct field installation.

Detailed Solution: Tonyhoo's Cable Accessories Portfolio

Company Overview

Ningbo Tonyhoo Electrical Technology Co., Ltd. was founded in 1997 and is headquartered in Ningbo, Zhejiang, China. The company operates a 9,900 m² manufacturing facility with approximately 100 employees, including a 20-engineer R&D team. Annual production capacity reaches 200,000 units, and about 50% of products are exported to major markets including the United States, Thailand, China, Albania, and Vietnam.

Tonyhoo is a national high-tech enterprise and a member of the China Electricity Union. It has been recognized as an AA-level contract-abiding and credit-worthy unit (2019) and received an Excellent Supplier Quality Award in 2020. The company holds 12 trademark certificates and over 60 patents. In 2020, it established a new material laboratory and applied for a Municipal Engineering Center, allocating around 6% of annual R&D funds to research and improvement.

Tonyhoo's manufacturing facility in Ningbo, China, covers 9,900 m².

Core Products and Technical Specifications

Tonyhoo's product range covers medium- and low-voltage cable accessories, new materials for power environmental protection, and medium/high-voltage explosion-proof protection products. Key product lines include:

Cold Shrink Intermediate Joint (Cold Shrink Straight Joint)

Models: JLS-10/1.1, JLS-10/3.3, JLS-35/1.3, JLS-35/3.4. Voltage class: 8.7/10 kV, 12/20 kV, 19/35 kV. Cable section: 25–400 mm². Operating temperature: -40°C to 90°C. Material: silicone rubber. The cold shrink design uses rubber elasticity to maintain long-lasting clamping force, offering excellent sealing, waterproof, and dustproof performance. It is resistant to aging and temperature extremes, suitable for substations, power distribution systems, and industrial electrical equipment.

Cold Shrink Intermediate Joint (JLS series) for 10 kV to 35 kV cables.

Cable Lug

Models: DT / SC. Material: pure copper or tin-plated copper. Surface treatment: tin plating. Range: 10–400 mm². Standard: DIN / GB. Working temperature: -40°C to 125°C. Features include high electrical conductivity, low contact resistance, and corrosion resistance. Suitable for power distribution, electrical engineering, manufacturing, and renewable energy applications.

Cold Shrink Termination

Models: NLS-10/3.3, WLS-10/3.3; NLS-35/1.3, WLS-35/1.3. Voltage class: 0.6/1 kV. Cable section: 10–300 mm². Operating temperature: -40°C to 90°C. Material: silicone rubber. The cold shrink molding allows fast installation without open flame. It provides good insulation, sealing, and weather resistance, with a compact structure suitable for various environments.

Separable Connector

Model: DS/SC. Type: 8.7/10 kV 630 A European type rear arrester. Rated voltage: 15 kV. Rated current: 630 A. 1-minute AC withstand voltage: 42 kV. 15-minute DC withstand voltage: 52 kV. Lightning impulse withstand voltage: 95 kV. Partial discharge: ≤10 pC. Material: EPDM and tin-plated copper. Designed for compact substation cable connections and switchgear, with separable design, high mechanical strength, and maintenance-free operation.

Separable Connector (DS/SC) for 8.7/10 kV, 630 A applications.

Heat Shrink Termination

Models: SY10kV, SY26kV, SY35kV. Type: indoor termination. Voltage class: 8.7/10 kV, 12/20 kV, 19/35 kV. Cable section: 25–400 mm². Core type: single or three core. Shrink ratio: 2:1. Withstand voltage: 39 kV / 5 min. Temperature range: -40°C to 120°C. Material: cross-linked polyolefin. Heat shrink molding provides good sealing and high insulation strength.

Oil-Immersed Transformer

Models: S11-M, S13-M, S20-M, S22-M. Type: S13 10 kV oil-immersed distribution transformer. Rated capacity: 30–500 kVA. High voltage: 6/10/10.5/11 kV. Low voltage: 0.4 kV. Vector group: Dyn11/Yyn0. Short-circuit impedance: 4%. Oil-immersed cooling offers good heat dissipation, low loss, and strong overload capacity.

Polyurethane Sealant

Models: J-399, J-499, J-699. Color: light yellow. Applicable voltage level: 10 kV–35 kV. Hardness: 55A±10. Density: 1.55 g/m³±0.55. Material: polyurethane prepolymer. It is solvent-free, with minimal shrinkage after curing, good impermeability, high volume resistivity, and easy room-temperature application.

Explosion-Proof Blanket

Models: DS-FBT-10, DS-FBT-35, DS-FBT-110, DS-FBT-220. Materials: Oxford Cloth and Ultra-High Molecular Weight Polyethylene. Combustion performance (outer layer): B1. Tear strength: ≥3.5 kN·m⁻¹. Breakdown strength: ≥20 kV·mm⁻¹. Volume resistivity: ≥1×10¹³ Ω·cm. It is soft, resilient, impact-resistant, puncture-resistant, and resistant to high temperature and corrosion.

Aluminum-Magnesium Alloy Protection Housing

Model: 10kV/35kV/110kV. Material: aluminum-magnesium alloy. Flammability: shell B1 grade, sealing gasket V-0 flame retardant. Impact resistance: withstands vertical drop impact of a 1 kg weight from 2 m without cracks. Flexural strength: 127 MPa. Salt water resistance: after immersion in 3% sodium chloride solution for 3 days, no swelling, cracking, or interlayer peeling. Suitable for cable joint protection, electrical equipment housings, communication equipment protection, and outdoor equipment.

Grounding Box

Model: 35 kV, 66 kV, 110 kV, and 220 kV. Type: cross-interconnect grounding box. Material: SS304 / SS316 / SMC FRP. Cabinet insulation resistance: 5 MΩ. The box body withstands impact of 37.5 kV 10 times without breakdown. The direct buried box passes 0.2 MPa, 30-minute air tightness test without leakage. IP65 rated. Used for high-voltage cable earthing protection in power grids, AI data centers, and power transmission projects.

Additionally, Tonyhoo offers Fiberglass Reinforced Plastic (FRP) products as part of its portfolio for cable joint protection and related applications.

Manufacturing and R&D Capabilities

Tonyhoo's 9,900 m² facility includes production workshops, an assembly workshop, and a showroom. The company has been transforming its automated workshops and gradually achieving digitization. Its 20-engineer R&D team focuses on new materials, and the company invests around 6% of annual funds into research and improvement. In 2020, Tonyhoo established Ningbo Crelence Electric Technology Co., Ltd. and Ningbo Tonylum New Material Technology Co., Ltd., expanding from high-voltage cable accessories into medium/low voltage and new materials fields.

Production workshop at Tonyhoo's Ningbo facility.

Quality Control and Certifications

Tonyhoo products have been tested by the State Grid High Voltage Testing Center, SGS, and the Shanghai Cable Research Institute, obtaining corresponding reports. The company has been a national high-tech enterprise since 2015, an AA-level contract-abiding and credit-worthy unit since 2019, and received the 2019 Excellent Supplier Quality Award in 2020. It is also a director unit of the Ningbo Electrical and Power Industry Association.

Global Supply and Service

With a 50% export ratio, Tonyhoo serves customers in the United States, Thailand, China, Albania, Vietnam, and other markets including Russia, Saudi Arabia, and Tunisia. The company provides product catalogs, technical support, and export services. Contact: Claire, +8613345998377, admin@tonyhoo.com.cn, WhatsApp +8613345998377. Website: www.tonyhoo.com, blog: blog.tonyhoo.com.

Step-by-Step Breakdown: Selecting and Installing Cable Accessories

To ensure reliable performance, buyers and installers should follow a structured process:

1. Confirm parameters: Provide the supplier with voltage level, cable model, conductor cross-section, core quantity, and application environment (indoor/outdoor/direct burial). Complete parameters ensure proper product matching.
2. Choose cold shrink or heat shrink: Cold shrink accessories are preferred for projects with no open flame and tight schedules. Heat shrink accessories are suitable for budget-limited projects with certified flame operators. Both meet insulation, electric field control, and sealing requirements.
3. Prepare the cable: Strip the cable outer sheath, armour, and inner sheath according to drawing dimensions. Remove semi-conductive shielding layer, polish and clean the insulation surface to avoid scratches and dust.
4. Install the cold shrink body: Fit the cold shrink body and stress cone, position to specified dimension. Pull out the support core at constant speed to make the silicone part shrink closely on the cable.
5. Seal the connection: Apply cable sealant to protect against moisture, dust, and contaminants. Ensure complete coverage without gaps.
6. Inspect and test: Check sealing structure and appearance for displacement or gaps. Complete required inspection and testing before energizing.

Regular inspections should check for cracking of outer sheaths and water seepage at sealing positions. Once insulation damage is found, power must be cut off and the accessory replaced immediately.

On-site cable termination installation requires careful cable preparation and component positioning.

Use Cases: Where Tonyhoo Cable Accessories Are Applied

Tonyhoo cable accessories are designed for demanding environments, including:

• Indoor cabinets and outdoor substations: Terminations and connectors for switchgear and distribution panels.
• Underground cable trenches: Joints and protection housings for direct burial and duct applications.
• Coastal salt-fog areas: Corrosion-resistant products like aluminum-magnesium alloy housings and stainless steel explosion-proof housings.
• Wide temperature ranges (-40°C to 150°C): Silicone rubber cold shrink accessories maintain performance.
• Dust-polluted areas: Sealed terminations and joints prevent contamination.

Project types include power grid upgrades, wind-solar power station construction, urban underground cable reconstruction, railway power supply projects, and AI data center power distribution.

Comparison Table: Cold Shrink vs Heat Shrink Cable Accessories

The following comparison is based on Tonyhoo product data and industry knowledge. Both types meet requirements for insulation, electric field control, and sealing protection for medium voltage cables.

FAQ

Conclusion

Ningbo Tonyhoo Electrical Technology Co., Ltd. has built a comprehensive cable accessories portfolio over more than 25 years. With a 9,900 m² manufacturing facility, 100 employees, 20 engineers, and an annual capacity of 200,000 units, the company combines cold shrink and heat shrink technologies, protective housings, sealants, and transformers to serve power distribution markets worldwide. Its export ratio of 50% and presence in the US, Thailand, China, Albania, and Vietnam demonstrate international reach.

For procurement professionals, Tonyhoo offers a range of products that meet medium-voltage application requirements, supported by testing from State Grid High Voltage Testing Center, SGS, and Shanghai Cable Research Institute. The company's ongoing investment in R&D (around 6% of annual funds) and expansion into new materials position it for future growth, including a planned stock reform and IPO path.

To discuss your cable accessory requirements, request a quote, or ask for samples, contact Tonyhoo directly:

Tonyhoo showroom: contact us for product samples and quotations.