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Quick Details

  • Place of Origin: Zhejiang, China (Mainland)
  • Brand Name: CNSN
  • Model Number: 3UA55
  • Theory: Thermal Relay
  • Usage: Protective
  • Size: Miniature
  • Protect Feature: Sealed
  • Contact Load: Low Power
  • Export Markets: Global

Packaging & Delivery

Packaging Details In standard exporing cartons.
Delivery Time 7-15 working days.


1.Therml Relay, Protect Open Phase Relay
2.Rated Insulation Voltage: 660V/ 1100V
3.Rated Current(max): 630A
4.CE & Rohs

3UA55 thermal overload relay


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...

Operating Conditions

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 

Protection  Characteristics
ItemNO.Times  the  setting  currentRelease  timeTest  condition
11.05>   2hStart  from  Cold  status
21.2<   2hStart  from  Hot  status  right  after  item  no. 1
31.5<   2mStart  from  Hot  status  right  after  item  no. 1
47.22s< Tp< 10sStart  from  Cold  status
 Any  two  phases Another  phase  
51.00.9>   2hStart  from  Cold  status
61.150<   2hStart  from  Hot  status  right  after  item  no. 5


Protection  Characteristics
Item  3UA553UA593UA58
Rated  operational  current  456388
Rated  operational  voltage  6906901000
Phase-failure  protection  YesYesYes
Manual/Auto  reset  YesYesYes
Temperature  compensation  YesYesYes
Releasing  indicator  YesYesYes
Test  button  YesYesYes
Mounting  Plug-inas  single  unitPlug-in
Auxiliary  1NO+1NC1NO+1NC1NO+1NC
AC-15  220V  rated  current  A
AC-15  380V  rated  current  A
DC-13  220V  rated  current  A
(mm 2 )
Main  circuitSolid  or  stranded  conducto1.5~251.5~252.5~35
Finely  stranded  conductor
with  end  sleeve
Terminal  screwM5M5M5
Solid  or  stranded  conducto R2  x  (0.5~1)2  x  (0.5~1)2  x  (0.5~1)
Finely  stranded  conductor
with  end  sleeve
2  x  (0.5~1)2  x  (0.5~1)2  x  (0.5~1)
Terminal  screwM3.5M3.5M3.5


Selection  and  Ordering  Date
TypeNumberRated  current  AFuse  links  AFor  contactor




VRS2(3UA) Thermal overload relay





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China (Mainland) | Manufacturer, Trading Company
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