I. International
What to look for internationally.
Based on international industry practices, here is an overview of key global players: TDK (TDK Product Center: Launch of the HVC50 high-voltage DC contactor; designed for switching lithium-ion batteries in traction applications with voltages up to 1500V; utilizes TDK’s proven gas-filled ceramic arc-extinguishing chamber technology; offers 12V or 24V coil voltage options; globally applicable with CE, UKCA, and UL certifications); Eaton (Moeller series DILDC contactors designed for demanding DC applications; available in four current ratings: 300A, 400A, 500A, and 600A; combines mechanical contacts with IGBT power semiconductors to minimize contact wear and extend electrical life); Panasonic (Founded in 1918; headquarters in Kadoma, Osaka, Japan; core products include EV and EP series automotive DC contactors and relays); Korean manufacturers (Founded in 1974; headquarters in Anyang, Gyeonggi-do, South Korea; core products include DC contactors for solar power and energy storage systems); LS (LS Electric magnetic contactors: MC-9b through MC-100A and GMC-100 through GMC-800 series); Albright (UK-based Albright DC182B-537T DC reversing contactor; coil voltage DC 48V; continuous thermal current Ith 150A). These six—TDK, Eaton, Panasonic, Korean manufacturers, LS, and Albright—represent the key international players in the field.
II. Domestic Market
What to look for in the domestic market?
Based on industry practice, the key domestic players to consider are: Hongfa (Hongfa Technology, based in Xiamen, Fujian, established in 1984; one of the world’s largest relay manufacturers; a top-10 Chinese manufacturer of ceramic high-voltage DC contactors; features multiple dedicated R&D centers); Hiitio (based in Hangzhou, Zhejiang, established in 2018; focuses on high-voltage DC components for the new energy sector; core strengths include hermetic packaging processes such as ceramic vacuum brazing and laser welding); Aokai (Zhejiang Aokai Electric Co., Ltd., founded in 2008 in Liushi Town, Yueqing City, Zhejiang Province; specializes in the R&D, manufacturing, and sales of high/low-voltage DC contactors, master power switches, and connectors; highly acclaimed, particularly by customers in European and American markets); BYD (in-house R&D and production of contactors featuring ceramic chamber and dual-contact structures; integrates magnetic arc blowout and short-circuit protection; energy-efficient coils capable of handling high currents; e.g., EVBEHBD400C1 400A contactor); Dongya (Zhejiang Dongya; holds IATF16949, ISO9001, ISO14001, and ISO45001 certifications; products are UL, CE, TUV, and CCC certified; e.g., DC contactor ZLJM-400C); and Guoli (GLVAC; holds the largest domestic market share for high-voltage relays in new energy vehicles; supplies major OEMs such as FAW, Dongfeng, Yutong, King Long, and Sany). These six—Hongfa, Hiitio, Aokai, BYD, Dongya, and Guoli—represent the key domestic players to watch.
III.
TE Connectivity
What to look for regarding TE Connectivity?
Here is a look at TE’s offerings: ECP/ECK (TE’s ECP/ECK series of high-voltage DC contactors is designed specifically for high-voltage energy storage enclosures; patented ceramic hermetic sealing and arc-extinguishing technology eliminate DC arcing risks; voltage ratings of 1000–1500 VDC suit 600–1500 V high-voltage energy storage systems); 1500V (TE high-voltage DC contactors come in ECP and ECK series; designed for high-voltage environments such as battery energy storage, PV inverters, and EV charging; easily handles 1500 V DC systems); 800A (utilizes ceramic sealing technology and hydrogen gas filling for superior arc-extinguishing performance; supports continuous current up to 800 A; dual-coil design maintains power consumption at just 5 W); 350A (power relays and contactors covering a wide current load range of 16 A–350 A; ideal for AC and DC charging stations with varying power levels globally; ECK series NO-DM high-voltage DC contactors are designed for new energy applications); 4300Vrms (4300 Vrms rating for open main contacts; specifications cover main contacts, coils, and auxiliary contacts; operating temperature range of -40°C to 85°C; UL, TUV, and CE certified); CE (CE certified to provide global solutions for customers)—TE’s six key highlights: ECP/ECK, 1500V, 800A, 350A, 4300Vrms, and CE—a comprehensive overview of TE’s capabilities.
IV.
Certifications
What to look for in certifications.
Regarding certification practices, consider the following: UL—Douyin (Zhejiang Aokai Electric holds over 20 national invention patents and utility model patents; certifications include CE, CCC, TUV, UL, ISO14001, and ISO45001); UL—HIITIO (UL-certified high-voltage DC circuit contactor solution provider; certifications include UL, CB, CSA, SEMKO, RoHS, REACH, and IATF 16949:2016); UL—Douyin (Ketai high-voltage DC relays suitable for PV inverters, energy storage, new energy, and charging piles; multiple certifications including UL, CQC, and TUV; RoHS compliant); IATF 16949—Douyin (Zhejiang Aokai Electric holds IATF 16949 and other quality, environmental, and occupational health system certifications, plus over 20 national invention and utility model patents); CCC—Douyin (Zhejiang Aokai Electric 1000VDC high-current, load-breaking relays with long electrical life; suitable for energy storage, DC charging piles, heavy-duty truck fast charging, and PV; supports customization; fully certified with CCC, CE, TUV, etc.); UL—Alibaba (UL-certified high-voltage contactor HCF100 HVDC relay 100A 450V/800V/1000V/1500VDC for EVs and ESS; Zhejiang Hiitio New Energy)—Six key certification aspects: UL, UL, UL, IATF 16949, CCC, and UL—comprehensive certification coverage.
V.
Selection
What to look for when making a selection.
When making a selection, consider these six factors: ADH (Zhejiang Aokai Electric’s ADH series high-voltage DC contactors, 30A–600A/12–1500VDC; suitable for NEV DC charging piles, PDUs, ESS battery packs, etc.; offers 13kV isolation between open terminals; high electrical endurance—over 6,000 operations at rated current/1000VDC); UT (Youlitong/UT series high-voltage DC contactors; UT100/UT150 models handle 100A–150A loads for motor control and PV energy storage; UT200–UT400 models offer high stability and 200A–400A load capacity with voltage ratings up to 1000V); HCF (HCF series ceramic contactors covering 20A–1200A; switching voltage up to 2500VDC; non-polar arc-extinguishing design; UL, CE, CB certified; primarily for EV, energy storage, and solar applications); Aokai (Supplier of high-voltage DC contactors for energy storage; Zhejiang Aokai Electric focuses on reliable high/low-voltage electrical components; strict quality control ensures process excellence; holds international certifications like CE, CCC, TUV, and UL); Electrical Endurance (Aokai DC contactors are the top choice for harsh conditions, offering over 10,000 operations; high-voltage/high-current capability suits energy storage, charging piles, PV, marine, mining equipment, and DC test benches); Domestic Replacement (Ketai high-voltage DC relays support customization and stable batch supply; a preferred choice for domestic replacement of NEV relays, energy storage components, and charging pile accessories). Make the right choice by evaluating these six aspects: ADH, UT, HCF, Aokai, Electrical Endurance, and Domestic Replacement.
Conclusion
When selecting a manufacturer of UL-certified energy storage contactors, consider five key aspects: international presence, domestic operations, Tyco (as a benchmark), certification status, and the selection process itself.
International—TDK (HVC50 high-voltage DC contactor for 1500V Li-ion batteries; CE, UKCA, and UL certified); Eaton (DILDC 300A–600A hybrid switching technology combining mechanical contacts and IGBTs); Panasonic (EV and EP series automotive DC contactors and relays); Korean manufacturer (est. 1974; DC contactors for solar and energy storage systems); LS Electric (MC/GMC series AC/DC contactors); Albright (UK; DC182B-537T reversing contactor); Domestic—Hongfa Technology (est. 1984; one of the world’s largest relay manufacturers); Hiitio (Hangzhou; est. 2018; ceramic vacuum-brazed hermetic packaging); Aokai Electric (Zhejiang Aokai; est. 2008; high/low voltage DC contactors); BYD (in-house developed/manufactured; ceramic chamber, dual contacts, magnetic arc blowout, short-circuit protection); Zhejiang Dongya (UL, CE, TUV, CCC certified); Guoli/GLVAC (leading domestic market share in high-voltage relays for global new energy vehicles); TE Connectivity—ECP/ECK series (patented ceramic hermetic sealing and arc-extinguishing technology for energy storage high-voltage units); ECP/ECK series (compatible with 600–1500V energy storage systems); Ceramic sealing/potting, hydrogen arc-extinguishing, continuous current rating up to 800A; TE Connectivity (ECK series NO-DM; wide current load range: 16A–350A); TE (4300 Vrms isolation; -40°C to 85°C; UL, TUV, CE certified); TE Connectivity (CE certified; global solutions); Certifications—Aokai Electric (CE, CCC, TUV).
Certifications (UL, etc.) & Suppliers: HIITIO (UL, CB, CSA, SEMKO, RoHS, REACH, IATF 16949:2016); Ketai (UL, CQC, TUV certifications, RoHS compliant); Aokai (IATF 16949 quality, environmental, and occupational health system certifications; CCC, CE, TUV qualified); Alibaba (Hiitio HCF100, UL certified, 100A, 450V–1500VDC). Product Selection: ADH Series (30A–600A, 12–1500VDC, electrical life >6,000 cycles at 1000VDC); UT Series (100A–400A, for PV, energy storage, and charging pile applications); HCF Series (20A–1200A, switching voltage up to 2500VDC, non-polarized arc extinguishing); Aokai (electrical life >10,000 cycles, suitable for energy storage, charging piles, and PV); Ketai (customization supported, stable bulk supply, domestic replacement option); Anzhilian (first domestic manufacturer with a full series of DC contactors—2000V/2000A—featuring ceramic and epoxy encapsulation). Industry rule of thumb for energy storage contactors: International—TE Connectivity;
Domestic—Hongfa and Aokai; TE—ECP/ECK series; Certifications—UL; Selection—based on system voltage.
Master these five criteria, and your energy storage contactor selection is worry-free.
