Axial Cement Wirewound Resistor

Core Design & Application Advantage

The Axial Cement Wirewound Resistor from RST Electric offers a classic, time-tested solution for applications requiring robust power handling in a standard axial-lead configuration. Unlike radial-lead or chassis-mount resistors, this Through-Hole Power Resistor features leads extending from both ends of the rectangular ceramic body, allowing it to be mounted horizontally on PCBs or used with standoffs for elevated cooling. This traditional axial orientation simplifies PCB layout, facilitates automated insertion, and enables easy replacement in field service scenarios.

Structural Construction & Versatile Power Range

The construction of this Ceramic Encased Resistor emphasizes thermal performance and mechanical integrity. The resistive element—available in wirewound construction for high pulse capability and low resistance values (down to 0.1Ω) or metal film for low noise and high resistance values (up to 100kΩ)—is precisely wound or deposited on a ceramic substrate, then encapsulated in an inorganic silica filler and housed in a flame-retardant ceramic case. The rectangular profile provides stable placement, while the axial leads offer strong solder joint retention. The SQZ series spans a wide power range—from 5W for compact power supplies to 100W for industrial drives—making it a versatile choice across diverse applications.

Comprehensive Quality Assurance & Manufacturing Expertise

Each unit undergoes comprehensive quality validation. Solderability testing ensures >90% coverage under 260±5°C for 2 seconds. Dielectric withstand is verified at 500VAC for 5 seconds with no breakdown. Temperature coefficient is maintained at ≤ ±250 ppm/°C. Temperature cycling from -55°C to +200°C confirms structural integrity, while endurance testing at rated voltage for 1000 hours validates long-term reliability. Overload testing at 10× rated power (wirewound) or 5× rated power (metal film) confirms pulse capability. As a trusted Axial Cement Wirewound Resistor manufacturer in China, RST Electric combines over 10 years of power resistor engineering expertise with precision manufacturing to deliver components that offer reliable performance in both high-volume production and field maintenance environments.

Technical Specification

Product Advantages

1.Standard Axial Lead Configuration – Leads exit from both ends of the rectangular body, enabling through-hole PCB mounting, standoff mounting, or socket-based installation.

2.Wide Power Range – From 5W to 100W in a single series, covering diverse applications from compact power supplies to industrial drives.

3.Dual Element Technology – Wirewound option for high pulse capability (10× overload) and low resistance (0.1Ω); metal film option for low noise and high resistance (100kΩ).

4.Flame-Retardant Ceramic Housing – Encapsulated in inorganic silica filler within a ceramic case for excellent heat dissipation, electrical insulation, and mechanical protection.

5.High Temperature Operation – Continuous operation up to +200°C surface temperature with linear derating for safe use.

6.Low Temperature Coefficient – ≤ ±250 ppm/°C ensures stable resistance values across the full operating temperature range.

7.Precision Tolerances – Available from ±1% to ±10% to meet tight circuit requirements or cost-sensitive designs.

8.Robust Lead Strength – 10N pull test ensures reliable through-hole mounting and solder joint integrity.

9.Comprehensive Quality Validation – 100% testing of solderability, dielectric strength, and endurance per IEC 60115 standards.

10.Standardized Package – Consistent dimensions across power ratings simplify PCB layout and inventory management.

Product Applications

Drawing and dimensions

Package and shipment

RST Electric ensures safe delivery of every Axial Cement Wirewound Resistor:

● Bulk Packaging: Resistors are packed in anti-static plastic bags with foam cushioning, then placed in corrugated cartons to prevent lead bending and ceramic damage.

● Lead Protection: Axial leads are kept straight with end caps or foam strips.

● Documentation: Packing lists and inspection certificates included with each shipment.

● Freight Options: Express courier (DHL/FedEx/UPS) for small quantities, air freight for medium volumes, sea freight for bulk orders.

All units undergo 100% electrical testing and visual inspection before packaging to ensure they meet specified resistance values and cosmetic standards.

Regarding RST Electric

As a professional manufacturer with over ten years of experience in the resistor field, RST Electric focuses on the research and production of Axial Cement Wirewound Resistors. With its mature technological accumulation, it has become a reliable supplier in the industry. We have complete independent production capabilities, completing the entire process from wire winding, metal film deposition, to packaging and testing independently. We strictly control every step to ensure stable and uniform product quality.

We have an ISO 9001-certified production base, equipped with a dedicated axial lead ceramic resistor production line. Each resistor undergoes comprehensive electrical testing, covering core indicators such as resistance value, dielectric properties, and insulation. At the same time, relevant tests such as temperature cycling and durability are conducted in strict accordance with the IEC 60115 standard to ensure product reliability.

We adopt the direct supply model from the factory, without any middle-level markup. The pricing is transparent and reasonable, enabling customers to obtain high-quality products at a favorable cost. Leveraging our extensive industry experience, we can offer flexible customization services, covering various parameters such as power, resistance value, tolerance, TCR, etc. Additionally, we can provide personalized customization options like coil winding without inductors and lead wire forming, according to customer requirements.

Our products are sold worldwide in over 40 countries, serving various fields such as power supply, motor drive, and consumer electronics. We also offer 12-month warranty, remote fault diagnosis, spare parts supply, and professional technical support. Our expert team can provide product integration guidance to fully meet the diverse needs of different customers. With professionalism and reliability, we have gained recognition from customers all over the world.