3UA55 thermal overload relay are suitable for overload and phase-failure protection of AC motors with frequency of 50/60Hz, voltage up to 690-1000V, current up to 0.1-630A under 8-hours duty or uninterrupted duty. Functions provided by these relays, are phase-failure protection, temperature compensation, ON/OFF indication and manual/automatic reset. Applicable Standards: National Standard: GB 14048, International Standard: IEC 60947-4-1. The relays can be mounted onto contactors or installed as single units...
The altitude couldn t exceed 2000m. Ambient temperature: -5 ~+55 degree centigrade and the average temperature no more than +35 degree centigrade in 24 hours. Atmosphere: Comparative humidity no more than 50% at max +40 degree centigrade, and it may be higher at a lower temperature. The lowest average temperature no more than +20 degree centigrade in the wettest month. The maximum average comparative humidity of this month could not exceed 90%, The change of temperature leading to dew on the product must be considered. Class of pollution: Class 3. The slope between installation surface and vertical surface could not exceed plus and minus 5 degree Keeping away from explosive, corrosive and electric atomy. Keeping dry. The product should be used and installed at certain place without any shock, vibration etc.
Three-phase thermal relays with release class 10A. With differential phase-failure protection. With continuous current adjusting scale. With temperature compensation. With ON/OFF indicator. With Manual/Auto reset button. With Auxiliary contacts 1 NO+1 NC insulated each other. Mounting: Plug in connection with contactor or install as a single unit