Automatic electrical controls - Particular requirements for thermal motor protectors
Automatic electrical controls - Particular requirements for thermal motor protectors
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What is BS EN IEC 60730-2-22 about?
BS EN IEC 60730-2-22 discusses thermal motor protectors. BS EN IEC 60730-2-2 specifies requirements for thermal motor protector which is used in households and similar appliances like heating, air conditioning. Note 1: BS EN IEC 60730-2-22 applies to the partial evaluation of thermal motor protectors for household and similar use, including heating, air conditioning, and similar applications as well as for sealed (hermetic and semi-hermetic type) motor compressors. Note 2: A thermal motor protector is considered an integrated control since its protective functionality is dependent on the correct mounting and fixing in or on a motor and which can only be fully tested in combination with the relevant motor. This dependency is illustrated by:
The ability of the thermal motor protector to accurately and reliably sense the heat of the motor windings thus addressing the over-temperature protection due to motor overload conditions The ability of the thermal motor protector to sense accurately and reliably the current due to motor locked rotor conditions; thus, reducing the response time and not being adversely affected by heat-sink at the assembly spot in the application The influence of the motor’s electromagnetic field on the switch behaviour of the thermal motor protector particularly, affects the arc direction between the contacts resulting in uneven wear of the contact material and eventually leading to failure of the operation.
Note 3: BS EN IEC 60730-2-22 applies to thermal motor protectors using NTC or PTC thermistors. Note 4: BS EN IEC 60730-2-22 applies to the inherent safety, to the operating values, operating times, and operating sequences, where such are associated with...
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