TKR7 thermal overload relay is suitable for using in power system with AC

50Hz,  rated operation voltage up to 660V and 1000V, in main circuit, current

from 0.1A to 630A.  It is used to protect AC 3 phase asynchronous motor against

overload and phase failure. The current setting value can be regulated and the setting current values of many thermal elements are intercrossing overlapping arrangement, for easy selecting by the customers from －25℃ to +55℃ air temperature as the products have temperature compensating. The relays have the test push-button for breaking NC contacts, the operating indication and free trip characteristics.  The items conform to, IEC60947-4-1..