Quick Answer: What Is the Difference Between IEC 60950-1 and IEC 62368-1?
IEC 60950-1 vs IEC 62368-1 (Quick Comparison):
- IEC 60950-1: Rule-based safety (prescriptive design requirements)
- IEC 62368-1: Hazard-Based Safety Engineering (energy source control)
- IEC 62368-1 has replaced IEC 60950-1 and IEC 60065 in most global markets
The fundamental difference lies in their safety philosophy.
IEC 60950-1 follows a prescriptive design-based approach, meaning manufacturers must comply with specific construction requirements to ensure product safety.
IEC 62368-1 introduces Hazard-Based Safety Engineering (HBSE), which focuses on identifying potential energy sources that could cause injury and implementing safeguards to protect users.
This modern safety framework allows engineers greater design flexibility while maintaining strict protection levels.
Evolution of Electronic Equipment Safety Standards
Safety standards for electronic equipment have evolved alongside advances in modern electronics.
Historically, safety standards were separated by product category.
| Standard | Equipment Type |
|---|---|
| IEC 60950-1 | Information Technology Equipment |
| IEC 60065 | Audio and Video Equipment |
However, modern electronic products frequently combine multiple functions. For example:
- Smart TVs integrate networking systems
- Communication devices include multimedia capabilities
- Consumer electronics combine computing and AV technologies
Because of this convergence, the International Electrotechnical Commission (IEC) developed IEC 62368-1 as a unified safety standard.
This standard is technology-neutral and designed to support hybrid and future electronic systems.
What Is IEC 60950-1?
IEC 60950-1 was originally developed for information technology equipment (ITE) such as:
- Computers
- Servers
- Networking equipment
- Telecommunications systems
- External power adapters
The standard focused on preventing hazards including:
- Electric shock
- Fire risk
- Overheating
- Mechanical injury
IEC 60950-1 used a rule-based safety system, where the standard defined strict construction requirements such as:
- Insulation spacing
- Enclosure design
- Component safety ratings
- Electrical clearance distances
Although this approach ensured consistent safety performance, it limited engineering flexibility and innovation.
What Is IEC 62368-1?
IEC 62368-1 is a next-generation safety standard covering information technology and audio/video equipment.
Instead of relying on rigid design rules, the standard uses Hazard-Based Safety Engineering (HBSE).
The safety process typically involves three steps:
- Identify energy sources within the equipment
- Determine whether those energy sources could cause injury
- Implement safeguards to prevent harm
Energy sources considered in IEC 62368-1 include:
- Electrical energy
- Thermal energy
- Mechanical energy
- Radiation energy
In addition, IEC 62368-1 introduces the concept of different user types:
- Ordinary person
- Instructed person
- Skilled person
The safety requirements will vary depending on who may access the hazard.
Engineering Comparison: IEC 60950-1 vs IEC 62368-1
| Design Aspect | IEC 60950-1 | IEC 62368-1 |
|---|---|---|
| Safety philosophy | Prescriptive design rules | Hazard-based safety engineering |
| Equipment scope | IT equipment | ICT + audio/video equipment |
| Design flexibility | Limited | High |
| Risk evaluation | Fixed construction rules | Energy hazard analysis |
| Safety strategy | Prevent hazards through design limits | Identify hazards and apply safeguards |
| Innovation support | Moderate | High |
Because of this shift, IEC 62368-1 is considered the future safety framework for electronic equipment.
Hazard-Based Safety Engineering (HBSE) Explained
The HBSE model focuses on controlling energy that could potentially cause harm.
The safety logic can be simplified as:
Energy Source → Transfer Mechanism → Body → Injury → Safeguard
IEC 62368-1 also defines different safeguard types:
- Basic Safeguard
- Supplementary Safeguard
- Reinforced Safeguard
And evaluates safety under:
- Normal Operating Conditions
- Single Fault Conditions (critical for certification)
For example, switching power adapters may generate high voltage electrical energy.
Engineering Example
A 65W USB-C power adapter primary circuit may operate at approximately 400V DC (ES3 level).
Required safeguards include:
- Reinforced insulation between primary and secondary circuits
- Creepage distance ≥ 8 mm (depending on pollution degree)
- Y-capacitor leakage current control
- Thermal shutdown under abnormal conditions
This structured approach ensures hazardous energy sources remain safely controlled.
Energy Source Classification in IEC 62368-1
IEC 62368-1 introduces a new energy classification system.
| Energy Class | Description |
|---|---|
| ES1 | Safe energy levels |
| ES2 | May cause discomfort |
| ES3 | Potentially harmful energy |
Depending on the classification, different safeguards must be applied.
For example:
- ES1 may require no protection
- ES2 requires basic safeguards
- ES3 requires reinforced protection
This classification system allows engineers to design equipment based on realistic risk evaluation.
Impact on Power Adapter Design
The transition from IEC 60950-1 to IEC 62368-1 significantly affects power adapter and external power supply design.
Modern power adapters must evaluate hazards such as:
- High voltage circuits
- Transformer insulation failures
- Abnormal temperature rise
- Short circuit conditions
To meet IEC 62368-1 requirements, modern switching power adapters often include:
- Over-current protection
- Over-voltage protection
- Thermal shutdown protection
- Reinforced insulation barriers
- Fire-resistant enclosure materials
These safety mechanisms help ensure compliance with international safety regulations.
Manufacturers such as Quankang design power adapters that comply with IEC 62368-1 and UL 62368-1 safety standards.
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How to Choose an IEC 62368-1 Power Adapter Supplier
For equipment manufacturers, selecting the right power adapter supplier is critical for product safety certification and long-term reliability.
When evaluating a supplier, engineers and procurement teams should verify the following factors:
| Evaluation Factor | Why It Matters |
|---|---|
| IEC 62368-1 certification | Required for global market access |
| UL / EN safety approvals | Regional compliance |
| Insulation protection design | Prevent electrical hazards |
| Thermal protection system | Prevent overheating |
| Component reliability | Long-term product stability |
| Manufacturing quality system | Consistent production |
Working with an experienced manufacturer can significantly simplify product certification and reduce compliance risks.
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Typical Applications of IEC 62368-1 Power Adapters
IEC 62368-1 compliant power adapters are widely used in:
- Networking equipment
- Routers and switches
- Industrial control systems
- Communication devices
- Consumer electronics
- USB-C charging adapters
These devices often operate continuously and handle significant electrical energy, making safety certification essential.
Global Certification Requirements
Although IEC 62368-1 defines the international safety framework, regional certifications are required.
| Region | Certification |
|---|---|
| United States | UL 62368-1 |
| Europe | EN 62368-1 |
| Canada | CSA 62368-1 |
| International | IEC 62368-1 |
Products intended for global markets typically require multiple certifications, often supported through CB Scheme testing reports.
Power Adapter Safety Certification Checklist
Before selecting a power adapter supplier, manufacturers should confirm:
- IEC 62368-1 certification
- UL safety approval
- CB test reports
- Insulation protection levels
- Thermal protection design
- Fire-resistant enclosure materials
Using certified power adapters simplifies product approval and market entry.
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Conclusion
The transition from IEC 60950-1 to IEC 62368-1 represents a major shift in electronic equipment safety engineering.
Instead of rigid design rules, IEC 62368-1 introduces a hazard-based safety model that evaluates energy sources and applies safeguards to prevent injury.
For engineers, this means greater design flexibility; for manufacturers, it means more rigorous risk assessment and compliance responsibilities.
As electronic technologies continue to evolve, IEC 62368-1 provides a flexible safety framework capable of supporting future innovation while maintaining high levels of user protection.
