1. Product Category
What to look for in the product category.
Based on industry practice, the product categories are viewed as follows: DC Circuit Breakers—sinobreaker.com (Synode Electric is a manufacturer of DC protection components for solar PV, energy storage, and EV-related systems; founded by an engineering team with decades of experience in low-voltage protection, we design and build reliable devices that keep DC systems safe and efficient in demanding outdoor and industrial environments—Synode); MCB/MCCB—sinobreaker.com (Our portfolio covers DC circuit breakers (MCB/MCCB), DC isolator switches, and fuse links & holders—Synode); Molded Case Circuit Breakers (MCCB)—Douyin (Beilu Electric MCCB NLDM5DC-250/2300: rated insulation voltage 1500V, rated DC operating voltage 1000V, rated impulse withstand voltage 12kV; suitable for charging piles, PV power stations, energy storage, wind power, etc.; features overload long-time delay and short-circuit instantaneous protection functions—Beilu Electric); Miniature Circuit Breakers (MCB)—Douyin (ZYDL2-63DC series DC MCBs are suitable for 50/60Hz circuits with rated voltages of 250V–1000V and rated currents up to 125A; they protect personnel from indirect contact and safeguard equipment—Douyin); DC Isolators—energy-cnc.com (CNC Energy provides DC protection, isolation switching, and distribution products, including DC isolators, circuit breakers, PV fuses, surge protection devices, combiner boxes, and other related components—CNC Energy); Isolator Switches—made-in-china.com (Manufacturer of DC Isolators, Solar Power Inverter PV Load 1000V Disconnect Switches; our commitment to quality boosts brand awareness for your company; to achieve our goals, our factory and products comply with UL, SAA, CB, CE, TUV, ISO, and RoHS standards—Made-in-China)—A six-category overview: DC Circuit Breakers, MCB/MCCB, Molded Case Circuit Breakers, Miniature Circuit Breakers, DC Isolators, and Isolator Switches—covering these six categories comprehensively.
2. Manufacturer
What does the manufacturer look at?
According to the manufacturer’s practice, the manufacturer sees it this way: CNC Energy——energy-cnc.com（In 2018 we launched CNC Energy our dedicated product line for photovoltaic and DC power systems, Backed by integrated R&D manufacturing quality control and global service capabilities CNC Energy supports distributors EPC contractors system integrators and solar projects, CNC Energy）; Xianglang——made-in-china.com（On-time Delivery OEM TUV Worldsunlight Circuit Solar System Breaker for
Battery DC MCB with CB XL7-63, Yueqing Xianglang Electric Co. Ltd. Diamond Member Audited Supplier Manufacturer/Factory & Trading Company
ISO9001:2015, Yueqing Xianglang); Beilu—Douyin (Beilu Electric, a professional manufacturer of smart circuit breakers; the NLDM5DC-250/2300 molded case circuit breaker is suitable for charging piles, PV power stations, energy storage, wind power, etc.; Beilu Electric); Geya—Douyin (Geya’s new GYM9H-DC PV DC circuit breaker supports 1000V DC; provides overload and short-circuit protection for systems with DC voltages up to 1000V and rated currents up to 63A; suitable for DC system applications such as telecommunications and PV systems; compliant with GB14048.2 and IEC60947-2; Geya); Delixi—Douyin (Delixi Electric’s all-new 6-series CDM6Z DC molded case circuit breaker is suitable for DC circuits with rated operating voltages of DC250V, DC500V, DC750V, and DC1000V and rated currents of 63A–630A; widely applicable in PV power generation and charging piles; Delixi); Chint—chint.net (NM5DC series DC molded case circuit breakers are widely used in power distribution scenarios across industries such as telecommunications, new energy, and power supply; rated operating voltages of DC750/1000/1500V, rated operating currents of 800A–1600A, rated ultimate breaking capacity of 25kA/36kA, and rated service breaking capacity of Ics=100%Icu across the entire series; Chint Electrics)—Six manufacturers to consider: CNC Energy, Xianglang, Beilu, Geya, Delixi, and Chint; these six manufacturers are top-tier choices.
III.
Customization
What to look for in customization.
Regarding customization practices, consider these six perspectives: OEM/ODM (e.g., chinese.alibaba.com – Mulang MLM1-630L Molded Case Circuit Breaker); OEM Customization (e.g., made-in-china.com – Worldsunlight DC MCB for solar battery systems); OEM Factory (e.g., chac-electric.com – CQB7DC-63 series DC miniature circuit breaker manufacturer); Made-to-Order (e.g., Douyin – DC circuit breakers and universal circuit breakers available for custom production and wholesale); Customization Support (e.g., Douyin – MCCBs and universal circuit breakers available for custom manufacturing and direct sales); and General Customization (e.g., Douyin – Manufacturers of DC high-speed circuit breakers and frame circuit breakers offering custom production and quotes). These six angles ensure a comprehensive approach to customization.
IV.
Manufacturing Process
What to look for regarding the manufacturing process.
Based on technical practice, the features are categorized as follows: Arc-extinguishing chamber—geya.net (GYM10-DC 6-63A 1P-4P DC Miniature Circuit Breaker; 11-fin DC arc-extinguishing chamber + magnetic; Standards: IEC/EN 60947-2, GB/T 14048.2, RoHS 2.0 compliant; GEYA); Breaking capacity—Alibaba (MOREDAY DC Breaker 2P 600V/1000V DC MCB 16A-63A; Breaking Capacity: 6kA short-circuit interruption; Protection Curves: B & C; MOREDAY); High breaking capacity—fatai.com (FTBD DC high-breaking-capacity miniature circuit breaker; Standards: GB/T14048.2/IEC60947-2; Certification: CQC; Poles: 1P, 2P; Rated Current: 1–63A; Rated Operating Voltage: DC125/250V (1P), DC250/500V (2P); Fatai Electric); Arc testing—dadabreaker.com (Critical DC load current test; verification of cut-off current where arcing time increases significantly; Short-circuit breaking capacity; tested at maximum DC voltage with specified L/R time constant; Dada); Plug-in type—Douyin (Voltage options: 500V/800V/1000V; factory direct sales; fast response; high load capacity; DIN-rail mounting; plug-in design; Yeshui); DIN-rail type—made-in-china.com (Certified Etek DIN Rail Miniature DC MCB Circuit Breaker Etm1-63; VDE certified; TUV mark certified).
2025-06-05, Wenzhou Etek) — Six aspects of craftsmanship to examine: the arc-extinguishing chamber, breaking capacity, high breaking capacity, arc testing, plug-in capability, and DIN-rail mounting—ensuring quality workmanship across all six areas.
V.
Selection
What to look for when selecting a model.
Based on selection practices, here is how to approach the selection: Rated Voltage—chint.net (NM5DC series DC molded case circuit breakers: rated operational voltages of DC 750/1000/1500V, rated operational currents of 800A–1600A, rated ultimate breaking capacities of 25kA/36kA, rated service breaking capacity of Ics=100%Icu across the series; Chint Electrics); National Standards—cnca.gov.cn (GB/T 14048.2-2008 superseded by GB/T 14048.2-2020 “Low-voltage switchgear and controlgear – Part 2: Circuit-breakers”; release date: 2020-09-29; implementation date: 2021-04-01; scope expanded to include AC voltages up to 1500V; Certification and Accreditation Administration of the P.R.C.); Voltage Class—Douyin (Product complies with IEC 60947-2 and GB/T 14048.2 standards; ZYDL2-63DC series miniature DC circuit breakers suitable for rated voltages of 250V–1000V and rated current of 125A; Douyin); Recommended Current—xihari.com (Hybrid high-voltage DC circuit breaker NB/T XXXXX-XXXX; recommended rated DC currents selected from the following values in Amperes (A): 156, 250, 500, 625, 750, 1000, 1250, 1560, 2000, 2500, 3000, 3300, 4750, 5000, 6250; 5.5 Maximum continuous operating current; Xi’an High Voltage Apparatus Research Institute); Coordination—dadabreaker.com (IEC 61643-31 SPDs for photovoltaic applications – DC surge protection coordination with breakers; GB/T
14048.2 Chinese national standard CCC certification for China market, Dada); tripping curve – geya.net (Tripping Curves B (6±20%)In C (8.5±20%)In
