VRS2(3UA50) Application VRS2 series 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. Operating conditions The altitude couldn¡¯t exceed 2000m Ambient temperature: -5¡«+55¡æ and the average temperature no more than +35¡æ in 24 hours. Atmosphere:comparative humidity no more than 50% at max +40¡æ,and it may be higher at a lower temperature.The lowest average temperature no more than +20¡æ in the wettest month.The maximum average comparative humidity of this month couldn¡¯t 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 couldn¡¯t exceed ¡À5¡£ 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. Pls feel free to contact us if you are interested in our product.we will send you the more detail data after your kindly enquiry.