Product Overview

The HK18 PV Isolator Switch serves as a critical manual disconnection point engineered specifically for the safe isolation of circuits within solar photovoltaic (PV) systems. Encased in a heavy-duty, flame-retardant polymer housing that offers a solid, substantial tactile feel, this 200A Photovoltaic Knife Switch delivers a definitive, audible mechanical click upon engagement, assuring operators of a complete circuit break. Operating at AC 50Hz with a Rated Voltage of 400V, it is meticulously configured for infrequent manual switching across residential arrays, commercial rooftops, and expansive utility-scale solar farms. Fully compliant with the rigorous GB/T14048.3 Standard and classified under the AC-20B Usage Category, this Manual Disconnector acts as a frontline defense against accidental electric shock during routine system maintenance. Available in highly adaptable configurations including 2-pole and 4-pole variants (such as the HK18-125/4, HK18-160/4, and HK18-250/4), it seamlessly accommodates diverse PV string current demands ranging from 63A up to 200A.

Key Features & Benefits

High Rated Current Capacity Up to 200A

The HK18-250/4 PV Isolator Switch effortlessly manages a maximum Rated Current of 200A, providing a highly stable isolation node for high-capacity solar arrays. By utilizing thickened copper alloy contacts with optimized thermal dissipation properties, the unit prevents localized overheating even under continuous heavy electrical loads. This exceptional thermal stability translates to unwavering performance in demanding large-scale installations, ensuring that commercial or utility-grade solar infrastructure operates at peak efficiency without the risk of component degradation caused by thermal stress.

IP20 Protection Rating for Environmental Defense

Designed with a precisely molded enclosure, the switch achieves an IP20 Protection Rating, effectively blocking solid objects and ambient dust from compromising the internal switching mechanisms. This level of defense is vital for components housed within indoor electrical distribution cabinets or situated in harsh industrial environments. Capable of maintaining its structural and operational integrity across a broad temperature spectrum from -25°C to +70°C, the unit resists environmental wear, ensuring internal contacts remain clean and fully functional over years of continuous deployment.

No-Load Operation Safety Mechanism

Operator safety is prioritized through a strict “Do not operate with load” structural design. The switch incorporates an intentionally large contact gap and a physical interlock mechanism that actively mitigates the risk of dangerous arc flashes. By forcing a secure, load-free disconnection sequence, this manual knife switch protects on-site maintenance personnel from severe electrical hazards while simultaneously shielding sensitive downstream equipment, such as costly solar inverters, from sudden voltage spikes and arc-induced damage.

Extended Mechanical & Electrical Endurance

Built for absolute longevity, the internal actuation mechanism delivers a proven Mechanical Endurance of 10,000 cycles alongside an Electrical Endurance of 1,500 cycles. The calibrated resistance of the manual lever ensures that every actuation is deliberate and smooth, drastically reducing physical wear on the moving parts. For project developers and facility managers, this extended operational lifespan significantly lowers the frequency of component replacements, thereby minimizing ongoing maintenance expenditures and optimizing the total lifecycle costs for expansive solar energy networks.

6kV Rated Impulse Withstand Voltage

Solar installations are inherently exposed to unpredictable atmospheric conditions and grid fluctuations. This isolator switch is engineered to withstand a Rated Impulse Withstand Voltage of up to 6kV, offering robust insulation against transient overvoltages and sudden lightning-induced surges. This high threshold of surge resistance guarantees that the core distribution network remains stable and secure, preventing catastrophic localized failures during severe weather events or unexpected electrical grid anomalies.

Our Service Advantages

Tiered Bulk Order Discounts

We structure our pricing models to heavily favor large-scale procurement, offering highly competitive Bulk Order Discounts for the HK18 PV Isolator Switch series. This financial flexibility empowers EPC (Engineering, Procurement, and Construction) contractors and regional distributors to optimize their procurement budgets for extensive solar farm developments. By reducing the per-unit cost on large volume requests, we help you maintain healthy project margins while securing premium-grade isolation components for your entire distribution network.

Comprehensive Quality Test Reports

Transparency in manufacturing is a cornerstone of our operation. For every production batch, we can supply detailed Quality Test Reports and compliance certificates upon request. These authenticated documents verify strict adherence to the GB/T14048.3 Standard, ensuring product authenticity and performance metrics. Having immediate access to these testing records streamlines your internal quality control processes and provides undeniable proof of compliance during rigorous project audits and regulatory inspections.

24/7 After-Sales Technical Response

Unplanned downtime in solar energy generation translates directly to lost revenue. To combat this, our dedicated technical support team operates around the clock, providing a 24/7 After-Sales Response framework for all post-purchase inquiries. Whether you require immediate troubleshooting assistance, clarification on operational parameters, or rapid processing of warranty claims, our specialists are always on standby to ensure your PV systems return to peak operational status without unnecessary delays.

Professional Installation Guidance & Resources

Proper integration is vital for the safety and efficacy of manual disconnectors. We supply exhaustive Installation Guidance, including downloadable PDF wiring diagrams, step-by-step assembly manuals, and direct consultation with our engineering staff. This comprehensive support ensures that your on-site technicians can execute flawless, code-compliant installations, virtually eliminating the risk of wiring errors that could lead to system faults or safety hazards down the line.

Adaptable & Flexible Payment Terms

Navigating international procurement requires financial agility. We accommodate our global client base by offering flexible payment terms, supporting secure and widely accepted transaction methods such as Letters of Credit (L/C) and Telegraphic Transfers (T/T). These adaptable structures are designed to align with your company's cash flow requirements and project funding milestones, facilitating a smooth, risk-free transaction process that keeps your international supply chain moving without financial bottlenecks.

FAQs

What is the primary difference between the HK18-125/4 and HK18-250/4 models?

The core distinction lies in their maximum current-handling capabilities. The HK18-125/4 is engineered to safely manage a continuous current of up to 125A, making it highly suitable for medium-scale array segments. Conversely, the HK18-250/4 is a heavy-duty variant capable of handling up to 200A, designed specifically for high-output solar configurations. Selecting the appropriate model depends entirely on calculating the total output current of your specific PV strings to ensure optimal performance and prevent thermal overloading.

Is this manual isolator switch suitable for outdoor solar installations?

Out of the box, the device carries an IP20 Protection Rating, which guards against solid ingress but is not inherently waterproof. Therefore, for outdoor solar applications, it must be securely housed within a dedicated weatherproof distribution box, rain shield, or NEMA-rated enclosure. When properly shielded from direct moisture, its wide operating temperature range (-25°C to +70°C) allows it to perform flawlessly in varying and extreme outdoor climates.

Does the switch require professional installation?

Yes, absolutely. Due to the high voltage (400V) and substantial current (up to 200A) involved in solar energy distribution, we strongly recommend that installation be executed by certified electrical technicians. Adhering to our provided Installation Guidance and local electrical codes ensures that the anti-live-operation mechanisms are correctly implemented, safeguarding both the maintenance personnel and the connected inverter equipment from potential arc flash incidents or incorrect wiring hazards.

What international certifications does the switch hold?

This isolator series is rigorously tested and fully certified under the GB/T14048.3 standard, while also holding prominent CCC and IEC international certifications. These credentials guarantee that the product meets stringent global benchmarks for electrical safety, mechanical endurance, and operational reliability, ensuring seamless and fully compliant integration into heavily regulated commercial and utility-scale solar projects worldwide.