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IEC 62310 Static Transfer Systems Electromagnetic Compatibility Requirements

The IEC 62310 lab testing method ensures that free-standing operation a.c. static transfer systems ensure the continuity of load supply. As a leader in EMC regulatory compliance testing, Keystone Compliance assists electronic equipment manufacturers with EMC testing. Meeting the IEC, EN, and other EMC testing requirements can be challenging. Not only do we understand the challenges, but we help guide companies through the process.

Keystone’s EMC testing engineers streamline the process and assist companies to achieve the compliance they require. Keystone takes pride in providing the peace of mind that all of your unintentional radiator testing needs will be met. Regarded as a leader in unintentional radiator testing, Keystone Compliance assists companies in EMC testing daily. From concept through compliance, Keystone meets all of our customers’ needs under one roof.

Request a quote to receive expert IEC 62310 compliance testing services tailored to your specific needs. Contact us to discuss your product and how we can assist you in achieving certifications.

Summary of IEC 62310 EMC Static Transfer System Testing

The static transfer systems (STS) must ensure the continuity of load supply through controlled transfer, with or without interruption of power. This is tested from two or more independent a.c. sources.

The IEC 62310 unintentional radiator standard includes requirements for the switching elements, their control, and protective elements. Moreover, the standard only applies to systems up to 1,000 V a.c. which are intended to be used in single-phase, phase-phase, or three-phase applications.

IEC 62310 electromagnetic compatibility requirements are selected to ensure adequate EMC levels for static transfer systems at public or industrial locations.

Lastly, the IEC 62310 standard does not apply to:

  • Devices for d.c. source switching.
  • Single source systems.
  • Transfer systems using electromechanical switching devices are intended to be used in emergency power systems with interruption of the supply to the load during transfer.
  • Automatic switching devices integrated into uninterruptible power systems.

Scope of IEC 62310 Laboratory Compliance Testing Information

There are multiple emission and immunity requirements and conditions to be noted within the test IEC 62310 compliance test standard.


General requirements for EMC 62310 emission testing include disturbances in the frequency range from 0 to 1,0 GHz. The emission limits represent essential electromagnetic requirements that have been selected together with specific test methods. These requirements ensure that disturbances generated by STS operating normally do not reach unwanted levels that prevent other apparatus from operating as intended.

The requirements are specified for each STS port. This is done to comply with the applicable emission limits of conducted and radiated emissions considering the STS category. The emission limits must also comply with the following measurement conditions:

  • Rated input voltage;
  • All combinations of operating modes concerning input sources and load;
  • At linear load current that results in the highest emission level.

Lastly, for STS with a.c. output terminals for the connection to accessories, the terminals are connected to the minimum configuration of accessories necessary to exercise the ports.


IEC 62310 immunity requirements in the frequency range of 0 Hz to 1 GHz are covered.

The IEC 62310 EMC test requirements represent essential electromagnetic compatibility immunity requirements. Additionally, IEC 62310 requirements are specified for each port considered. Moreover, the levels indicated within this standard do not cover cases in industrial environments. The levels also do not cover extreme cases which may occur in any location but with an extremely low probability of occurrence.

The test is conducted with the STS in the following conditions:

  • Rated input voltage.
  • Any normal mode of operation.
  • Linear load at rated current. The light load test condition is acceptable for certain specified currents.

Minimum immunity requirements for high-frequency disturbance tests are established by the compliance standard and test facility. If the STS is designed to have specific immunity, the information must be written in the installation/user manual before being utilized by the end consumer.

Additionally, it is important to note that the test apparatus will be subjected to immunity of low-frequency signals, immunity to power-frequency magnetic fields, and immunity of voltage dips.

Expert IEC 62310 Laboratory Compliance Testing Services

In addition to IEC 62310 EMC testing, Keystone has a full scope of expertise including environmental and package testing such as temperature, cold chain, and accelerated aging

Our team strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. 

If you are ready to start your electromagnetic compatibility emission and immunity testing, please request a quote. For more information on why so many companies partner with Keystone Compliance, contact us.