What is IEC60950-1?

IEC60950-1 is safety standard for information technology equipment, including electrical business equipment and associated equipment.
In respond to this international standard, own conformed standard is established in each country i.e. EN60950-1 in Europe, UN60950-1 in USA.
Most of the built-in power supply are considered to be used as a part of information technology equipment, therefore power supply should comply with IEC60950-1 requirement.
Following item are required to meet the standard, display information, internal components, protection against electric shock, mechanical safety, temperature and electric performance and connection for electric communication circuit.
Switching power supply is required most of the subject except "connection for electric communication circuit".
Requirement only for power supply is temperature increase of internal transformer.
Maximum allowable temperature is defined depending on the insulation class determined by the insulation material for magnet wire, insulation tape etc. According to the insulation class, see table 1.
Thermocouples are used for measuring the temperature.

Table 1 Insulation class and Maximum allowable temperature
No Insulation class Max. Allowable Temp. [℃]
Normal operation Overload condition
1 A 100 150
2 E 115 165
3 B 120 175
4 F 140 200
5 H 165 225

COSEL prepares CB test report, UL certification , EN certification for each product, and declares the conformity for Low Voltage Directive (LVD).
IEC60950-1 and EN60950-1 are going to be withdrawn in June, 2019, and they will be transferred to IEC62368-1.
IEC62368-1 is the standard for safety of electrical and electronic equipment within the field of audio, video, information and communication technology, and business and office machines.

Technical Product-related Inquires