Operating Characteristics

The characteristics given are average values of all ranges and sizes of all bimetal relays and hence indicate the inverse time current characteristics of the same. The tripping time shown are foe relay starting from cold state and there will be 25% reduction in the value of the curve for relay starting from hot state ( heated at rated current)

 

 

 

RELAY SELECTION TABLE FOR DOL STARTER / CONTACTOR
Motor rating
415V,3ø
Full Load Current Relay range Back-up
HRC fuse
DOL starter or Contactor
hp kw A A A Type
0.75 0.55 1.6 1.5 - 2.5 6 GK-1
or
GL-1
1.00 0.75 1.8 1.5 - 2.5 6
1.25 0.92 2.1 1.5 - 2.5 10
1.50 1.10 2.6 2.5 - 4.0 10
1.75 1.30 3.0 2.5 - 4.0 16
2.00 1.5 3.5 2.5 - 4.0 16
2.50 1.80 4.8 4.0 - 6.5 16
3.00 2.20 5.0 4.0 - 6.5 16
4.00 3.00 6.2 4.0 - 6.5 20
5.00 3.70 7.5 6.0 - 10 20
6.00 4.50 9.0 6.0 - 10 25
7.5 5.50 11.0 9.0-14 25 GK-1or GL-1
10 7.5 14.0 10.0-16.0 35 GL-1
12.5 9.3 18.0 13.0-21.0 50 GL-1.5
15.0 11.0 21.0 20.0-32.0 50
17.5 13.0 24.0 20.0-32.0 50 GL-2
20.0 15.0 28.0 20.0-32.0 63
25.0 18.5 35.0 28.0-42.0 80 GL-3
30.0 22.5 40.0 28.0-42.0 100
 
RELAY SELECTION TABLE FOR STAR - DELTA STARTER / CONTACTOR
Motor rating
415V,3ø
Full Load Current Relay range Back-up
HRC fuse
Star-Delta starter or Contactor
hp kw A A A Type
3 2.25 5.0 2.5-4.0 16 GK-1
or
GL-1
5 3.75 7.5 4.0-6.5 20
7.5 5.5 11 6.0-10.0
25
10 7.5 14 6.0-10.0
12.5 9.3 18 9.0-14 35 GK-1or GL-1
15 11 21 10.0-16.0 35 GL-1
20 15 28 13.0-21.0 63 GL-2
30 22.5 40 20.0-32.0
35 26 47 20.0-32.0
45 33.5 60 28.0-42.0 100 GL-3
50 37.5 66 28.0-42.0
   
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