kW to Amp
Calculator
Kilowatt se Ampere nikalo — Single Phase aur Three Phase. Motor nameplate padhna ho ya cable sizing karna ho, yeh tool must-have hai.
125% rule
kW to Amp — Kya Hai Aur Kyun Zaroori Hai?
Bhai, Gulf ki har site pe — chahe Qatar University ho, Sidra Hospital ho ya Al Daayen Hospital — pehla sawaal yeh aata hai: “Motor kitne Amp ka hai?” Nameplate pe kW likha hota hai, lekin cable select karna hai toh Amp chahiye. Yeh calculator isi kaam ka hai.
Main Arif hoon, 12+ saal ka Gulf experience hai. Maine dekha hai naaye electricians motor ka kW dekh ke seedha cable laga dete hain — bina current calculate kiye. Result? Cable overheating, MCB trip, aur supervisor ki daant. Ye teeno cheezein is calculator se bach sakte hain.
Formula — Single Phase
I = Current (Amperes)
V = Voltage (230V Gulf/India)
PF = Power Factor (0.8-1.0)
Formula — Three Phase
√3 = 1.732
V = Line Voltage (415V Gulf/India)
Power Factor Kyun Important Hai?
Bahut saare electricians sirf kW ÷ V karte hain — yeh galat hai. AC circuit mein power factor ignore karna matlab kam current nikaalna. Gulf projects mein QA/QC engineer calculation check karta hai — agar PF nahi lagaya toh method statement reject. Motors ka PF typically 0.80-0.85 hota hai, heaters ka 1.0, aur LED lights ka 0.90-0.95.
Motor: 7.5 kW, 415V, 3-Phase, PF 0.85
I = 7500 / (1.732 × 415 × 0.85)
I = 7500 / 611.28 = 12.27A
Design Current = 12.27 × 1.25 = 15.34A
MCB: 16A C-curve | Cable: 2.5mm² Cu minimum
Heater: 3 kW, 230V, Single Phase, PF 1.0
I = 3000 / (230 × 1.0) = 13.04A
Design Current = 13.04 × 1.25 = 16.30A
MCB: 20A B-curve | Cable: 2.5mm² Cu
kW, kVA aur kVAR — Farak Samjho
kW = Real Power — actual kaam karta hai. kVA = Apparent Power — supply ko itna dena padta hai. Formula: kVA = kW ÷ PF. Generator aur UPS ki sizing kVA mein hoti hai, kW mein nahi. Isliye PF bahut important hai.
Gulf Standard Voltages
| Region | Single Phase | Three Phase | Frequency |
|---|---|---|---|
| Qatar/UAE/Saudi | 230V | 415V | 50Hz |
| India | 230V | 415V | 50Hz |
| UK/Europe | 230-240V | 400V | 50Hz |
| USA | 120V | 480V | 60Hz |
Common Motor kW to Amp Table — 415V, PF 0.85
| Motor kW | FLC (A) | Design (A) | MCB | Cable |
|---|---|---|---|---|
| 0.75 | 1.2 | 1.5 | 6A | 1.5mm² |
| 1.5 | 2.5 | 3.1 | 6A | 1.5mm² |
| 3.0 | 4.9 | 6.1 | 10A | 1.5mm² |
| 5.5 | 9.0 | 11.3 | 16A | 2.5mm² |
| 7.5 | 12.3 | 15.3 | 16A | 2.5mm² |
| 11 | 18.0 | 22.5 | 25A | 4mm² |
| 15 | 24.5 | 30.7 | 32A | 6mm² |
| 22 | 36.0 | 45.0 | 50A | 10mm² |
| 37 | 60.6 | 75.7 | 80A | 16mm² |
| 55 | 90.0 | 112.5 | 125A | 35mm² |
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