VR28 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 0.1-150A 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.
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 and the average temperature no more than +35 in 24
hours.
● Atmosphere: Comparative humidity no more than 50% at max +40 , and it may be higher at a lower temperature. The lowest average temperature no more than +20 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 5o.
● 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.