FAQ Knowledge Base

DC MCBs are specifically designed for direct current applications with arc suppression optimized for DC circuits. Use DC MCBs for solar PV, battery systems, and DC power supplies. AC MCBs are for alternating current applications like building distribution boards. Never use AC MCBs in DC systems—they cannot safely interrupt DC arcs.

Type 1 SPDs (Class I) handle direct lightning strikes at the service entrance. Type 2 SPDs (Class II) protect against induced surges at sub-distribution boards—most common in buildings. Type 3 SPDs (Class III) are point-of-use protection at sensitive equipment. For comprehensive protection, use coordinated Type 1 + Type 2 systems.

Use our DC MCB Selection Guide: (1) Calculate string Isc (short-circuit current), (2) Select MCB rated current ≥ 1.25 × Isc, (3) Verify DC voltage rating ≥ system Voc, (4) Confirm breaking capacity matches fault current. Our technical team can validate your calculations.

RCCB (Residual Current Circuit Breaker) only detects earth leakage/residual current and provides shock protection. RCBO (Residual Current Breaker with Overcurrent) combines RCD functionality with overcurrent protection (like an MCB), saving panel space. Use RCBOs when you need both functions in a single device.

We offer: (1) Logo printing on product housing, (2) Custom label design, (3) Modified current ratings within standard frames, (4) Custom packaging and labeling, (5) Private labeling with your brand. MOQ varies by customization type—contact us for specific requirements.

Yes, we provide ODM services for custom designs. Our engineering team can develop products based on your specifications, including modified mechanical dimensions, special current ratings, integrated features, or application-specific designs. Lead time typically 8-12 weeks after design approval.

MOQ depends on customization level: Simple logo printing (500-1000 units), Custom label design (1000-2000 units), Modified product design (2000-5000 units). Contact our sales team for volume pricing and flexible MOQ options for long-term partnerships.

Yes, comprehensive OEM technical support includes: Product selection consulting, Application engineering review, Test report interpretation, Certification guidance (CE, UL, IEC), Installation documentation, and Post-sales technical assistance. Dedicated engineers assigned to major OEM accounts.

Our products are certified to major international standards: IEC 60947-2 (MCBs), IEC 61643-11 (SPDs), IEC 60947-6-1 (ATS), UL 489 (MCBs), UL 1449 (SPDs). Specific certifications vary by product—check product datasheets or use our Market Access Advisor to verify requirements for your target market.

Yes, we provide: (1) Type test reports from accredited labs (TÜV, CNAS, ITS), (2) Certificate of conformity, (3) Factory inspection certificates, (4) Material declarations (RoHS, REACH), (5) Product datasheets with technical specifications. Documents available in English and can be notarized if required.

Yes, applicable products carry CE marking and comply with: Low Voltage Directive (LVD 2014/35/EU), EMC Directive (2014/30/EU), RoHS Directive (2011/65/EU). We provide Declaration of Conformity (DoC) and technical files for regulatory inspections. Use our Market Access Advisor for EU-specific requirements.

Use our Market Access Advisor tool: (1) Select your product type, (2) Choose your target country/region, (3) Get country-specific requirements and applicable standards, (4) View which of our products meet those requirements. For complex projects, request a compliance review from our technical team.

Standard products (catalog items): 2-3 weeks for stock items, 4-6 weeks for made-to-order standard configurations. OEM/customized products: 6-8 weeks after sample approval. Large volume orders (container loads): 8-10 weeks. Express production available for urgent orders with additional fees.

Standard terms: 30% deposit, 70% before shipment (T/T). For established customers: Net 30-60 days with approved credit. LC at sight accepted for large orders. PayPal/Alibaba Trade Assurance available for smaller trial orders. Contact us to discuss terms suitable for your business.

Yes, we ship worldwide. Options: (1) Sea freight (FCL/LCL)—most economical for large orders, (2) Air freight—faster for urgent orders, (3) Express courier (DHL, FedEx, UPS)—for samples and small shipments. We handle FOB, CIF, DDU terms. Incoterms negotiable based on your preference.

Yes, samples available for evaluation. Sample policy: (1) Free samples for established customers (freight collect), (2) Sample cost for new customers (refundable against first order), (3) Customized samples charged at cost. Samples typically ship within 3-5 days via express courier.

MOQ varies by product: Standard products (no customization): 100-500 units per SKU, OEM/customized products: 1000-5000 units depending on customization level. Flexible MOQ for trial orders and long-term partnerships. Contact sales for specific product MOQ and volume discounts.

Standard warranty: 24 months from shipment date for manufacturing defects. Extended warranty available for OEM partnerships. Warranty covers material and workmanship defects. Does not cover damage from improper installation, overvoltage, environmental factors, or normal wear. Repair or replacement at our discretion.

Contact us immediately with: (1) Product model and batch number, (2) Photos/videos of the issue, (3) Description of the problem. Our QA team will investigate within 24 hours. For confirmed defects: replacement units shipped, credit issued, or repair arranged. Detailed quality claim process available from your account manager.

Yes, we provide: (1) Detailed installation manuals (English, Chinese), (2) Wiring diagrams and dimensional drawings, (3) Installation videos for complex products, (4) Remote technical support via email/WhatsApp, (5) On-site commissioning support for large projects (fees apply). Training sessions available for distributors.

Yes, we offer free application engineering review for projects using our products: (1) System design review, (2) Product selection validation, (3) Protection coordination check, (4) Standards compliance verification. Submit your single-line diagram and specifications via our contact form for review within 3-5 business days.