GB20943-2025
Minimum allowable values of energy efficiency and energy efficiency grades for AC-DC and AC-AC power supplies
交流-直流和交流-交流电源能效限定值及能效等级
GB 20943-2025 is an upcoming mandatory Chinese national standard for Minimum allowable values of energy efficiency and energy efficiency grades for AC-DC and AC-AC power supplies. It appears in the Construction compliance cluster with a electrical safety focus and has an implementation date of Feb 1, 2027.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to AC-DC and AC-AC power supplies operating under 220V/50Hz conditions, specifically covering external power supplies with a rated output power ≤500W and internal power supplies for microcomputers and servers with rated output power ≤27.5kW. It also includes the power supply sections of USB port adapters in extended sockets, wall sockets, and converters. This standard is mandatory for manufacturers of these specified power supply categories entering the Chinese market. It does not apply to combined products with batteries, wireless charging external power supplies, Power over Ethernet (PoE) supplies, or products powering industrial equipment, vehicles, and medical devices.
Technical requirements
The standard establishes a 3-tier energy efficiency grading system for both external and internal power supplies, where Grade 1 represents the highest efficiency. For external power supplies, it categorizes products into single voltage output, adjustable voltage single output, and multiple voltage output types, setting specific minimum average efficiency limits, maximum no-load active power limits, and minimum power factor requirements under rated conditions. Manufacturers must ensure their products meet at least the Grade 3 requirements to be legally compliant. For internal power supplies (embedded power supplies), the standard differentiates between non-redundant and redundant applications, as well as low-voltage and high-voltage outputs. It specifies minimum active mode efficiency and minimum power factor values across various load conditions (10%, 20%, 50%, and 100%). The technical requirements have been significantly updated from the previous GB 20943-2013 version, expanding the scope to include adjustable and multiple output external power supplies, alongside internal power supplies. The standard also details the calculation methods for average efficiency, which involves testing at 100%, 75%, 50%, and 25% of the rated output current. Compliance with these multi-point efficiency metrics is crucial for market access. All measured values must be rounded to three decimal places according to the provisions in GB/T 8170.
Testing methods
Testing procedures are detailed in the appendices to ensure accurate measurement of energy efficiency metrics. For external power supplies, testing involves pre-heating the device, measuring input and output active power at various load levels (100%, 75%, 50%, 25%, and 0%), and calculating average efficiency and no-load power. For multiple output external power supplies, specific load combination methods are defined to distribute the test load accurately across ports. For internal power supplies, the testing method evaluates efficiency and power factor at 10%, 20%, 50%, and 100% loads, with specific configurations for redundant and non-redundant applications, including provisions for internal fan power management.
FAQs
What products are regulated under GB 20943-2025?
The standard regulates AC-DC and AC-AC external power supplies (≤500W), internal power supplies for microcomputers and servers (≤27.5kW), and the power supply sections of USB port adapters in sockets and converters.
Are there any updates from the previous version of GB 20943?
Yes, GB 20943-2025 replaces GB 20943-2013. Major changes include an expanded scope covering adjustable voltage, multiple output external power supplies, and internal power supplies, along with updated efficiency limits and the removal of the 'energy-saving evaluation value'.
How does GB 20943-2025 define the minimum allowable values of energy efficiency?
The minimum allowable values correspond to the Grade 3 requirements in the standard's efficiency grading tables. Products must meet these minimum average efficiency, no-load power, and power factor thresholds to be compliant.
The summary above provides a high-level overview of GB 20943-2025. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 20943-2025 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Management
- CCS
- F01
- ICS
- 27.010
- Competent department
- Standardization Administration of China
- Technical committee
- National Technical Committee on Energy Fundamentals and Management of Standardization Administration of China
Relationships
Replaces:GB 20943-2013 (Current)