What is BS EN 60947-5-9:2007

BS EN 60947-5-9:2007 is a technical standard that specifies requirements for directly operated electromechanical contactors and motor-starters with or without overload protection. It provides guidelines for the design, construction, and testing of these devices to ensure their safe and reliable operation.

Scope and Application

This standard applies to contactors and motor-starters intended for use in electrical circuits with a rated voltage not exceeding 1,000 volts AC or 1,500 volts DC. It is applicable to both manually operated and electrically operated devices, as well as those with thermal and electromechanical overload protection.

The requirements of BS EN 60947-5-9:2007 are applicable to various industries and sectors, including industrial manufacturing, commercial buildings, power distribution systems, and motor control centers. It ensures that these devices meet minimum safety and performance criteria.

Design and Construction

The standard outlines specific requirements for contactors and motor-starters, such as their mechanical strength, electrical characteristics, and resistance to environmental conditions. It covers aspects like insulation, temperature rise, dielectric properties, and resistance to short circuit conditions.

BS EN 60947-5-9:2007 also provides guidelines for the selection of appropriate contactor or motor-starter ratings based on the application's operational requirements. This includes considerations such as the type of load, duty cycle, and switching frequency.

Testing and Certification

To ensure compliance with the standard, manufacturers subject their contactors and motor-starters to various tests, such as endurance tests, dielectric tests, and thermal tests. These tests verify the devices' ability to withstand mechanical stress, electrical currents, and temperature variations.

Certification bodies assess the devices against the requirements of BS EN 60947-5-9:2007 and grant the necessary certifications, such as the CE mark or the UL listing, to indicate compliance with the standard. These certifications provide assurance to users and regulatory authorities that the devices meet the necessary safety and performance standards.

In conclusion, BS EN 60947-5-9:2007 is a technical standard that ensures the safe and reliable operation of contactors and motor-starters used in various electrical circuits. It sets out requirements for their design, construction, testing, and certification to ensure compliance with minimum safety and performance criteria.