#	Manufacturer Number	Suppliers	Order quantity	Amount
{{index + 1}}	{{item.product.mprocode}}	Hnstshop Supplier	{{item.num}}	$ {{calcPrice(item)}}

News Center

FSHY (Foshan Haoyun) Resistor Product Series Comprehensive Analysis

2026-07-20 Source：SHEN ZHEN SHUNHAI TECHNOLOGY .,LTD

resistance

Foshan Haoyun Electrical Accessories Co., Ltd. (brand abbreviation: FSHY), established in December 2004 as a sino-foreign joint venture with a registered capital of RMB 20 million, is a wholly-owned subsidiary of Foshan Vistong Electronics Co., Ltd. Located in the Foshan National Torch Program Electronic and Electrical Industry Base, Sanshui District, Foshan City, Guangdong Province, FSHY is one of the few domestic manufacturers with complete R&D, manufacturing, and testing capabilities in the beam-welded a

FSHY (Foshan Haoyun) Resistor Product Series Comprehensive Analysis

I. Brand Introduction

The company possesses 31 sets of precision metal processing equipment including slow wire cutting machines, 96 sets of precision stamping equipment from German KAISER and Japanese ISIS brands, 20 sets of vacuum heat treatment equipment, 60 sets of precision resistance trimming equipment, and nearly 200 sets of power testing, temperature drift testing, and precision resistance measurement instruments from Japanese AE and Hioki brands. FSHY delivers approximately 1 billion components to customers annually and has obtained ISO9001, ISO14001, and IATF16949 certifications.

FSHY has established a complete R&D and manufacturing chain spanning from alloy material formulation development, electron beam welding precision processes, to component reliability testing, making it one of the few domestic high-tech enterprises with full-chain autonomous capabilities in the beam-welded alloy current sensing resistor sector.

II. Product Series Classification

FSHY's product line focuses on resistor shunts, primarily encompassing the following major series:

1. WSM Series – Molding Beam-Welded Alloy Resistors (MOLDING Series)

Part Number Convention: WSM + Package Size + Tolerance Code + Resistance Code + TCR Code + Packaging Code

Product Characteristics:

SMD package with molding beam-welded construction
Ultra-low resistance values down to 0.0002Ω (0.2mΩ)
High power design ranging from 2W to 4W and above
Pure copper electrodes for excellent conductivity
AEC-Q200 automotive-grade reliability certification
RoHS environmental compliance
Temperature coefficient as low as ±50ppm/℃

Typical Models: WSM2512MR002FT0 (2mΩ ±1% 2W), WSM2725FR001FT0 (1mΩ ±1% 4W)

Applications: BMS battery management systems, DC/DC power modules, cell testing equipment, inverter motor drive power supplies, automotive body control, new energy vehicles, etc.

2. WSN Series – Bare Chip Beam-Welded Alloy Resistors (BARE Series)

Part Number Convention: WSN + Package Size + Tolerance Code + Resistance Code + TCR Code + Packaging Code

Product Characteristics:

Bare chip construction without molding encapsulation
More stable and precise current sampling
Ultra-low resistance values down to 0.0001Ω (0.1mΩ)
High power handling capability
All-metal structure with acid washing and passivation surface treatment
Extremely low thermal EMF (<1μV/℃)
Ultra-low parasitic inductance down to 1nH for fast response
Operating temperature range: -55℃ to +170℃
AEC-Q200 automotive-grade reliability certification

Typical Models: WSN2512KR002FT0 (2mΩ ±1% 3W), WSKN1216ML500FT0 (0.5mΩ ±1% 5W)

Applications: New energy vehicle electronics, high-frequency AC current detection, high-current sampling, motor controllers, etc.

3. HYRM Series – Composite Alloy Resistors

Part Number Convention: HYRM + Package Size + Resistance Code + Tolerance Code + Packaging Code

Product Characteristics:

Composite structural design
High power handling capability
High precision up to ±1%
Low temperature coefficient
High stability and reliability

Typical Model: HYRM39200m50FT (0.5mΩ ±1% 5W, 3920 package)

Applications: Industrial control, power management, energy storage systems, etc.

4. HYRF Series – High Power Alloy Resistors

Part Number Convention: HYRF + Package Size + Resistance Code + Tolerance Code + Packaging Code

Product Characteristics:

High power design from 5W to 7W
Large package sizes (3920, 5930, etc.)
Low resistance range
High reliability
RoHS compliant

Typical Models: HYRF3920R001FT (1mΩ ±1% 5W), HYRF3920R004FT (4mΩ ±1% 5W), HYRF5930R002FT (2mΩ ±1% 7W)

Applications: High-power power supplies, industrial inverters, energy storage equipment, motor controllers, etc.

5. HYR Series – High Power Alloy Resistors

Part Number Convention: HYR + Power Code + Package Size + Resistance Code + Tolerance Code + Packaging Code

Product Characteristics:

High power design up to 4W
Multiple package sizes available (2725, 2728, etc.)
Low temperature coefficient of ±50ppm/℃
High precision ±1%
High stability

Typical Models: HYR4W2725R002F (2mΩ ±1% 4W), HYR4W2728R010F (10mΩ ±1% 4W)

Applications: New energy vehicle BMS, industrial control, power management, etc.

6. CSM Series – Compact Alloy Resistors

Part Number Convention: CSM + Package Size + Tolerance Code + Resistance Code + TCR Code + Packaging Code

Product Characteristics:

Small package sizes (1206, etc.)
1.5W power rating
Low temperature coefficient ±50ppm/℃
High precision ±1%

Typical Model: CSM1206MR010FT0 (10mΩ ±1% 1.5W)

Applications: Consumer electronics, portable devices, small power modules, etc.

7. WSMP/WSMB Series – High Power Molding Alloy Resistors

Product Characteristics:

High power handling
Molding package
High reliability
Suitable for harsh environments

Typical Model: WSMP4527KR040FT0

8. HYCS Series – Automotive Grade Shunts (AUTOMOTIVE Series)

Product Characteristics:

High-current signal sampling
Excellent load capability
High stability
Tolerance as low as ±0.5%
Extremely low thermal EMF and temperature coefficient
Overload current up to 1000A
Optional high-temperature automotive-grade connectors
Built-in NTC temperature sensor
Continuous load power up to 10W
Continuous load current up to 320A (100μΩ)
AEC-Q200 automotive-grade reliability certification
Custom designs accepted

Applications: New energy vehicle BDU, BMS, EPS, lighting, body control, motor drive, OBC, smart cockpit, onboard power battery management, etc.

9. WSNL/WSKN Series – Bare Chip Beam-Welded Alloy Resistors

Product Characteristics:

All-metal structure
Acid washing and passivation surface treatment
Strong weather resistance
Extremely low thermal EMF
Ultra-low parasitic inductance
Fast response speed

Typical Models: WSNL5930 (0.1mΩ), WSKN1216

III. Product Advantages

Full-Chain Autonomous Capability: Complete autonomous control from alloy material formulation development, electron beam welding precision processes, to component reliability testing.
Advanced Processes: Utilizing French-imported electron beam welding equipment and processes, vacuum high-energy electron beam welding technology ensures low heat loss at weld seams.
High Precision, Low Resistance: Resistance values down to 0.0001Ω, precision up to ±0.5%, temperature coefficient as low as ±50ppm/℃ or lower.
Automotive-Grade Certification: Core products certified to AEC-Q200 automotive reliability standards, compliant with IATF16949 quality management system.
Customization Services: Customizable packages, power ratings, resistance values, and pin configurations available, including PACS integrated shunt solutions.
Cost and Lead Time Advantages: Significant advantages in price and delivery time compared to international brands, with lead times much shorter than the 6+ months typical of foreign brands.

IV. Product Applications

FSHY products are widely used in the following fields:

New Energy Vehicles: Battery management systems (BMS), motor controllers, onboard power supplies, autonomous driving sensors, BDU, EPS, lighting, body control, OBC, smart cockpit, etc.
Energy Storage Systems: Energy storage BMS, inverters, cell testing equipment
Industrial Control: Inverters, high-power power supplies, motor drives, smart industry
Consumer Electronics: Smartphone fast charging, smart home appliances, power tools
Medical Equipment: Precision measurement instruments, medical devices
Measurement Instruments: Current detection, voltage sampling

V. Market Positioning

FSHY positions itself in the mid-to-high-end current sensing resistor market, with domestic substitution as its core strategy, directly competing with international brands such as Vishay and Isabellenhutte. The company primarily serves:

Automotive Electronics: Providing products for major domestic automakers including BYD, Wuling, and SAIC Motor
Industrial and Energy Storage: Delivering high-reliability solutions for industrial inverter and energy storage equipment manufacturers
Consumer Electronics: Supplying high-precision current sensing components for smartphones and smart home appliances

With the business philosophy of "More Focused, More Efficient, More Economical," FSHY has established an important position in the domestic automotive-grade alloy resistor market through localized technical support and rapid response capabilities, representing a core manufacturer in China's beam-welded alloy current sensing resistor sector.

VI. Recommended Supplier

Shenzhen Shunhai Technology Co., Ltd. is a professional agent and distributor of FSHY products, providing one-stop supply and services for the complete range of FSHY alloy resistors, including WSM, WSN, HYRM, HYRF, HYR, CSM, and other series. Shunhai Technology maintains substantial inventory of popular models to meet customer needs from sample to volume procurement, offering professional technical support and fast delivery services.

Back to List