CNC Magnet Thermal Relay JR28SJR28s series thermal overload relay are suitable for overload and phase failure protection of AC motors with frequency of 50 60Hz, voltage up to 690V, current up to 0. 1 630A under 8 hours duty or uninterrupted duty. Functions provided by these relays, are phase failure protection, ON OFF indication, temperature compensation, and manual automatic reset. International Standard: IEC 60947 4 1. The relays can be mounted onto contactors or installed as