This standard specifies electromagnetic relays and contactors with a contact rated current value not less than 5 A (AC, DC) for aircraft 28 V DC or 115 V/200 V, 400 Hz three-phase AC system (with the characteristics specified in ISO 1540) (hereinafter referred to as "product") performance requirements. Auxiliary contacts are available with lower ratings. Products specified in this standard are divided into three temperature classes and three types of sealing. This standard applies to single-pole and multi-pole products with electromagnetic action, magnetic latching or electromagnetic action, mechanical or magnetic self-locking controlled by 28 V DC or 115 V, 400 Hz AC voltage.