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Electrical Notes & Articles
Sharing Abstracts,Notes on various Electrical Engineering Topics.
Over Load Relay & Contactor for Starter
MAY 20, 2011 10 COMMENTS (HTTPS://ELECTRICALNOTES.WORDPRESS.COM/2011/05/20/OVER‑LOAD‑RELAY‑CONTACTOR‑FOR‑STARTER/#COMMENTS)
Over Load Relay & Contactor for Motor Starter:
Types of Over Load Relay:
1. Class 10: Would Trip after 10 seconds.2. Class 20: Would Trip after 20 seconds.3. Class 30: Would Trip after 30 seconds.
Over Load Relay should be set 115% to 130% of Motor Full Load Current.Class 10 is faster than Class 20 and Class 30 over Load Relay.
Size of over Load Relay:
Size Amp Capacity
S00
0.1 To 0.4
0.4 To 0.6
1.6 To 6
3 To 12
S03 To 12
6 To 25
S26 To 25
13 To 50
S3
13 To 50
25 To 100
S6 50 To 200
S10 & S12
55 To 250
200 To 540
300 To 63
Contactor Coil:
Coil Voltage (40 To 50Hz)
Suffix
24V T
48V W
110V To 127V A
220V To 240V B
277V H
380V To 415V L
Type of Contactor for Starter:
Contactor Application
AC1 Non‑Inductive or Slightly Inductive ,ResistiveLoad
AC2 Slip Ring Motor
AC3 Squirrel Cage Motor
AC4 Rapid Start / Stop
AC5a Switching of Electrical Discharge Lamp
AC5b Switching of Electrical Incandescent Lamp
AC6a Switching of Transformer
AC6b Switching of Capacitor Bank
AC7a Slightly Inductive Load in Household or sametype load
AC7b Motor Load in Household Application
AC8a Hermetic refrigerant Compressor Motor withManual O/L Reset
AC8bHermetic refrigerant Compressor Motor with
Auto O/L Reset
AC12 Control of Restive Load and Solid State Loadwith optocoupler Isolation
AC13 Control of Restive Load and Solid State withT/C Isolation
AC14 Control of Small Electro Magnetic Load (<72VA)
AC15 Control of Small Electro Magnetic Load (>72VA)
Making and Breaking Capacity of Contactor:
Contactor MakingCapacity(Amp)
Breaking Capacity(Amp)
AC1 1.5 X motor ratedcurrent
1.5 X motor rated current
AC2 4 X motor ratedcurrent
4 X motor rated current
AC3 10 X motor ratedcurrent
8 X motor rated current
AC4 12 X motor ratedcurrent
10 X motor rated current
AC5a 3 X motor ratedcurrent
3 X motor rated current
AC5b 1.5 X motor ratedcurrent
1.5 X motor rated current
AC6a 12 X motor ratedcurrent
10 X motor rated current
AC6b 12 X motor ratedcurrent
10 X motor rated current
AC7a 1.5 X motor ratedcurrent
1.5 X motor rated current
AC7b 8 X motor ratedcurrent
8 X motor rated current
AC8a 6 X motor ratedcurrent
6 X motor rated current
AC8b 6 X motor ratedcurrent
6 X motor rated current
AC12
AC13 10 X motor ratedcurrent
1.1 X motor rated current
AC14 6 X motor ratedcurrent
6 X motor rated current
AC15 10 X motor ratedcurrent
10 X motor rated current
Contactor Status:
ContactorStatus
ContinuityBetween Pins (N/C)
Non ContinuityBetween Pins (N/O)
Power NotApplied 32 and 33
21 and 22
11 and 12
A1 and A2
B1 and B2
PowerApplied
21 and 22
32 and 3311 and 12
A1 and A2
B1 and B2
Main Circuit Voltage of O/L Relay & Contactor:
1. A.C= 240V,415V2. D.C=230V,460V,600V
Contactor’s Coil Voltage:
1. A.C= 40V,220V,240V,415V2. D.C=24V(For PLC),110V,230V,460V
Rated Current of Contactor: (Thermal and Intermediate Duty):
1. A.C= 6,10,16,25,63,100,160,200,315,400,630,800 Amp2. D.C= 16,20,80,160,315,1250,8000 Amp.
(https://electricalnotes.files.wordpress.com/2011/05/2.jpg)
(https://electricalnotes.files.wordpress.com/2011/05/11.jpg)
(https://electricalnotes.files.wordpress.com/2011/05/1‑copy.jpg)
Contactor / Relay Setting / Fuse / Cable for DOL STARTER
H.P KW FLCContactorSize(Amp)
Relay settingFuse
Cable (mm2)
Min Max Cu Allu
0.5 0.37 1 – 0.8 1.17 4 1 1.5
0.75 0.55 1.3 9 1 1.5 4 1 1.5
1 0.74 1.9 9 1.6 2.3 6 1.5 2.5
1.5 1.11 2.6 9 2 3 6 1.5 2.5
2 1.49 3.7 9 2.5 3.7 10 1.5 2.5
3 2.2 4.8 9 4 5.9 16 1.5 2.5
5 3.73 7.8 9 6.3 9.4 20 1.5 2.5
7 5.22 11.2 12 8 11.7 25 2.5 4
10 7.46 16 16 12.5 18.7 25 4 6
12.5 9.32 19 32 16 23.4 32 4 6
15 11.19 20.8 32 16 23.4 50 6 10
20 14.92 28 32 20 30 50 6 10
25 18.65 34 38 32 37.4 63 10 16
30 22.38 40 45 32 47 80 16 25
40 29.84 53 63 50 59 100 25 35
50 37.3 65 70 57 65.5 125 25 50
60 44.76 78 85 70 88.9 125 25 50
75 55.95 96 110 85 98.2 160 50 70
100 74.6 131 140 115 168 200 70 95
125 93.25 156 170 115 168 250 120 150
150 111.9 189 205 160 234 315 150 240
180 134.28 227 250 160 234 355 185 300
215 160.39 271 300 200 299 400 – –
270 201.42 339 400 250 374 500 – –
335 249.91 338 475 320 468 500 – –
Relay Range & Back up Fuse for DOL Starter
H.P KW
FullLoadCurrent(amp)
RelayRang(Amp)
Back Up Fuse
Min Max
10 7.5 13.6 13 To 20 25 50
12.5 9.3 17 13 To 20 25 50
15 11.2 20 20 To 30 35 80
20 14.9 28 20 To 30 60 80
25 18.7 35 30 To 45 60 100
30 22.4 40 30 To 45 80 100
35 26.1 47 45 To 63 80 125
Relay Range & Back up Fuse for Star / Delta Starter
H.P KW
FullLoadCurrent(amp)
RelayRang(Amp)
Back Up Fuse
Min Max
20 14.9 28 13 To 20 60 60
25 18.7 35 20 To 30 60 100
30 22.4 40 20 To 30 60 100
35 26.1 47 20 To 30 80 100
40 29.8 55 30 To 35 80 125
50 37.3 66 30 To 35 100 125
60 44.8 80 45 To 63 100 160
75 55.95 95 45 To 63 125 160
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FILED UNDER UNCATEGORIZED
About Jignesh.ParmarJignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical) from Gujarat University. He has more than 13 yearsexperience in Power Transmission‑Power Distribution‑Electrical energy theft detection‑Electrical Maintenance‑ElectricalProjects(Planning‑Designing‑coordination‑Execution). He is Presently associate with one of the leading business group as a DeputyManager at Ahmedabad,India. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of ElectricalEngineering as per IS,NEC,IEC,IEEE codes. He is technical Author for ʺElectrical Mirrorʺ and ʺElectrical Indiaʺ Magazines. He isTechnical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & knowledge andhelp technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.
10 Responses to Over Load Relay & Contactor for Starter
Hament Kaushik says:September 30, 2011 at 8:13 amthanks sir jitis is very usfull for us.
ReplySaahib Ghouse says:November 12, 2011 at 9:58 amPlease provide relay coordination examples ..hand calculations if included and developing curves, selection of relay curves.Thumb rules or any logic or technic or any hidden knowledge in performing relay coordination studies and settings.
Thanks for your knowledge sharing…you are a real master..
Best Regards,
Replynikhil says:May 19, 2012 at 6:16 amsir please insist me the contactor size for the star delta stater also…….. and simple hand cluculations….
ReplyTANVEER SHAH says:May 19, 2012 at 11:44 amdefinitely your sharing valueable knowledge is a great task remembered to be ever for comforting other keep it up good job goodcontribution wish u more grow to show such a contributon to deliver spreading valueable knowledge.
thanks
TANVEER SHAH
Replyrishabh says:January 16, 2013 at 10:11 amthank you for posting it but it is incomplete knowledge for an engineer . he also deserves to know about various specifications aswhat is voltage and power factor that you have taken into consideration for making this chart. . please provide some basics sothat i can select mccb, contactor . o\l relay. for dol and s\d starter.kindly provide some information.
THANKS
ReplyJignesh.Parmar says:January 16, 2013 at 3:43 pmThanks for your valuable Suggestion !To calculate Size of Fuse/MCCB,Cable of Motor Please refer another Post Of this Blog
ReplyMUHAMMAD AFROOQ JAMAL says:September 22, 2013 at 5:05 am
really great and very helpfull…
ReplyYatindra says:December 1, 2013 at 1:17 pmTo calculate size of fuse, contactor, relay,cable of motor please help us.
ReplyJignesh.Parmar says:December 1, 2013 at 1:34 pmAlready given in the blog…Please search…
Replyarjun says:December 12, 2013 at 1:40 pmDear Sir,Your electrical basic note are very valuable as compare to diamond these notes cover all data which are very important forgaining knowledge of career growing engineers. please help me for understanding how 11kv transmission line enter in the plant, how its connected to the LT panel please help me.
Reply
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