Selecting Solid State Relays: Parameters and Certifications

Certifications and technical parameters are the primary decision factors when industrial buyers move from initial research to supplier evaluation for solid state relays (SSRs). Zhejiang Xurui Electronic Co., Ltd. (XURUI) is a China-based manufacturer of industrial switches, including solid state relays, with a 5,000+ m² factory producing up to 20 million units annually. This article examines how XURUI’s SSR portfolio addresses common procurement constraints around load ratings, control signals, and global compliance.

Problem / Opportunity

Industrial automation projects frequently require relays that meet specific voltage, current, and control signal types while holding valid certifications for the target market. A mismatch in load rating or missing regulatory approval can delay commissioning or cause safety issues. Buyers need a supplier that offers broad parametric coverage—from low-current signal switching to high-power motor control—and maintains recognised certifications such as UL, CE, TÜV SÜD, CCC, and RoHS. XURUI provides an SSR product line that spans these requirements, backed by a quality management system certified to ISO 9001 and 100% pre-shipment inspection.

XURUI’s Solid State Relay Solution

XURUI manufactures multiple SSR series designed for different control inputs and load configurations. The product line includes:

• XSSVR-CA W2 – analogue input (4‑20 mA), load voltage 0‑240 VAC, current range 10‑120 A. Suitable for analogue closed-loop control in industrial automation.
• XSSVR-VA W2 – voltage input (0‑10 VDC / 0‑5 VDC), same load specs, for heating, lighting, and automation.
• XSSVR-3P – three-phase SSR for 0‑380 VAC, max 200 A, with multiple control signal types (potentiometer, voltage, current). Used in heating, CNC, power supplies, and motor control.
• XSSR-3 W3 – panel-mount SSR for 24‑480 VAC, 10‑75 A, with DC or AC control. Designed for motor control, industrial heating, and automated systems.
• XSSR-F W2 – compact SSR for 24‑480 VAC, 10‑60 A, for heating, lighting, and motor control.
• XSSR-W5 – high-current SSR up to 125 A at 75‑480 VAC, for industrial automation and AC motor control.
• XSSR-W2-JK – 42‑480 VAC, 10‑120 A, with CCC certification (cert. no. 2024010303694665, valid to 2029-09-18).

All models feature PA66 nylon housing, switching times ≤10 ms, dielectric strength ≥2500 VAC, and an operating temperature range of -20 °C to +70 °C. The company recommends a load current safety factor of 50‑60% for resistive loads and 30‑40% for inductive loads.

XURUI’s manufacturing plant in Yueqing, Zhejiang, China.

Technical Explanation

Solid state relays from XURUI use semiconductor switching elements (typically thyristors or triacs) to control AC loads without moving contacts. Zero-crossing turn-on reduces inrush current and electromagnetic interference. Random-on versions are available where rapid phase-angle control is needed. The relays are electrically isolated between input and output, with insulation resistance ≥100 MΩ. The aluminium-alloy base plates on higher-current models (e.g., XSSR-W2-JK) enhance heat dissipation. Control inputs are compatible with standard PLCs: 3‑32 VDC, 80‑250 VAC, or analogue signals (0‑10 V, 4‑20 mA).

XURUI XSSVR-CA2440W2 – analogue-controlled SSR for industrial automation.

Application / Use-Case Scenarios

XURUI SSRs are deployed across several industrial environments. For example, a mining company in Germany used 650 units of the XSSR-W5 series for conveyor belt misalignment detection and safety shutdown, achieving 30% reduction in downtime and 25% lower maintenance costs over three years. An industrial automation provider in Malaysia integrated 800 XSSR-M1~M6 units (high-current SSRs) into PLC-controlled conveyor systems, reporting 65% reduction in maintenance costs with zero major failures. In another case, a German industrial equipment manufacturer installed 1,200 XSSR-W1 units for heating control, cutting maintenance costs by 60%. These examples illustrate how matching the right SSR model to the application—considering load type, ambient conditions, and control interface—delivers measurable operational benefits.

XURUI XSSVR-3P – three-phase SSR for industrial heating and motor control.

Market Trend Analysis

The global demand for solid state relays continues to grow as industries replace electromechanical relays to gain longer service life, silent operation, and faster switching. Key trends include the need for multi-control interfaces (analogue, DC, AC) in a single product family, higher current ratings for heavy industrial loads, and compliance with region-specific certifications such as CCC for China and UL for North America. XURUI addresses these trends by offering standardised series that cover from 2 A to 1000 A (e.g., XSSR-M1~M6 series), with custom options available via OEM/ODM services (minimum 100 units, lead time 15‑30 days).

Comparison with Traditional Solutions

Compared to electromechanical relays, XURUI’s SSRs eliminate contact wear, bounce, and arcing, resulting in longer electrical life and reduced maintenance. They operate silently and can switch at higher frequencies. However, SSRs generate heat that must be managed through proper heatsinking; XURUI’s datasheets specify load current safety factors to help buyers size heat sinks correctly. Additionally, SSRs have a higher initial cost than equivalent electromechanical relays, though total cost of ownership is often lower due to reduced downtime and replacement costs.

Future Outlook

As industrial automation and renewable energy systems expand, the need for robust, certified solid state relays will increase. XURUI is positioned to support this growth through its dedicated R&D team of 24+ engineers, over 60 national patents, and a flexible production capacity that ranges from 5,000 to 250,000 units per month per model. Continuous investment in testing equipment and certification maintenance (including TÜV SÜD and UL for other switch lines) reinforces its ability to meet evolving global standards.

FAQ

What certifications does XURUI hold for its solid state relays?

The XSSR-W2-JK series has obtained China Compulsory Certification (CCC, certificate no. 2024010303694665, valid until 2029-09-18) under standard GB/T 14048.5-2017. Other SSR series can be certified upon request or per project requirements. XURUI’s overall quality system is ISO 9001 certified, and its other product lines hold CE, TÜV SÜD, UL, KC, and RoHS certifications.

What load voltage and current ranges are available?

XURUI SSRs cover load voltages from 0‑240 VAC (single-phase) up to 0‑480 VAC, and three-phase models up to 0‑380 VAC. Maximum load currents range from 2 A (XSSR-P series) to 1000 A (XSSR-M6). Most series support currents between 10 A and 120 A.

Can I get custom control signals or special form factors?

Yes. XURUI offers OEM/ODM services with customisation options including handle/logo, dimensions, and operating characteristics. The standard product line already covers multiple control types: 3‑32 VDC, 80‑250 VAC, 0‑10 VDC, 0‑5 VDC, and 4‑20 mA. Minimum order quantity is 100 units, with lead times of 15‑30 days.

For detailed specifications, download the XURUI product brochure: https://cdn.socialarks.com/sbsp/24581/0/2026/0420/69e5946baa5a5.pdf

Contact XURUI for pricing and custom requirements:
Email: Leon@chinaxurui.com
Tel: +86-577-62911448
WhatsApp: +86 13968773211