"This part of IEC 1812 applies to specified time relays@ such as time delay relays@ in accordance with definitions as laid down in IEC 50(446)@ for use in industrial applications (e.g. control@ automation@ signal and industrial equipment). The term ""relay"" as used in this standard comprises all types of relays@ other than measuring relays@ with specified time function. Depending on the field of application of these relays (e.g. for electricity generation@ transmission and distribution)@ further standards may be applicable."