VALICALC · TECHNICAL REFERENCE

Motor Current Estimate Reference

Compare authored three-phase motor current estimates by shaft kW at your voltage, efficiency and power factor. Nameplate current and code FLC remain separate.

SCENARIO MATRIX

Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.

SELECTED REFERENCE

0.75 kW shaft scenario

Estimated line current
1.415 A
Estimated electrical input
0.833 kW
Shaft output
0.75 kW
All fields & cell provenance
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

v1.3.0 · verified 2026-10-07 · values use the valid conditions shown above

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0.75 kW shaft scenario1.415 ABack to answer ↑

Explore the verified data

10 matching rows · 10 in this subset

Motor Current Estimate Reference, metric display
Shaft output scenarioEstimated line currentEstimated electrical inputShaft outputActions
0.75 kW shaft scenario1.415 A0.833 kW0.75 kW
1.5 kW shaft scenario2.83 A1.667 kW1.5 kW
2.2 kW shaft scenario4.151 A2.444 kW2.2 kW
4 kW shaft scenario7.547 A4.444 kW4 kW
7.5 kW shaft scenario14.151 A8.333 kW7.5 kW
11 kW shaft scenario20.754 A12.222 kW11 kW
15 kW shaft scenario28.301 A16.667 kW15 kW
22 kW shaft scenario41.509 A24.444 kW22 kW
30 kW shaft scenario56.603 A33.333 kW30 kW
55 kW shaft scenario103.772 A61.111 kW55 kW

0.75 kW shaft scenario

Estimated line current
1.415 A
Estimated electrical input
0.833 kW
Shaft output
0.75 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

1.5 kW shaft scenario

Estimated line current
2.83 A
Estimated electrical input
1.667 kW
Shaft output
1.5 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

2.2 kW shaft scenario

Estimated line current
4.151 A
Estimated electrical input
2.444 kW
Shaft output
2.2 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

4 kW shaft scenario

Estimated line current
7.547 A
Estimated electrical input
4.444 kW
Shaft output
4 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

7.5 kW shaft scenario

Estimated line current
14.151 A
Estimated electrical input
8.333 kW
Shaft output
7.5 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

11 kW shaft scenario

Estimated line current
20.754 A
Estimated electrical input
12.222 kW
Shaft output
11 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

15 kW shaft scenario

Estimated line current
28.301 A
Estimated electrical input
16.667 kW
Shaft output
15 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

22 kW shaft scenario

Estimated line current
41.509 A
Estimated electrical input
24.444 kW
Shaft output
22 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

30 kW shaft scenario

Estimated line current
56.603 A
Estimated electrical input
33.333 kW
Shaft output
30 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

55 kW shaft scenario

Estimated line current
103.772 A
Estimated electrical input
61.111 kW
Shaft output
55 kW
More dimensions
Entered line-line voltage
400 V
Entered efficiency
90 %
Entered power factor
0.85

How to use this data

I=shaft output W/(efficiency fraction × √3 × RMS line-line V × PF). This rearranges the disclosed power relationship; it does not establish permitted wire or protection sizes.

    CHECK THE METHOD

    Worked example

    7.5 kW shaft output at 400 V, efficiency 90% and PF 0.85 gives about 14.151 A. Lower efficiency or PF increases the estimate.

    Related calculators

    CalculatorVoltage Drop CalculatorCalculatorTorque from Power and RPM Calculator

    Continue the reference workflow

    ReferenceMotor kW & HP Conversion ChartReferenceSingle & Three-Phase Power ReferenceReferenceCommon AC Voltage System Labels

    Common lookup questions

    What should I confirm before using this lookup?

    Not an ampacity, breaker, protection or installation-code selection. Verify the actual electrical system and equipment nameplate; voltage-drop checks remain separate.

    TRACEABLE DATA

    Sources, scope & verification

    Dataset v1.3.0
    Last verified:

    Ten authored shaft-power scenarios. Balanced three-phase, stated PF/efficiency; no startup, locked-rotor or standard-table FLC.

    Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.

    Motor input power, current and efficiency relationship ↗

    Type A · US Department of Energy · Determining Electric Motor Load and Efficiency, equations 1–2, 1997

    Original equations, chosen scenarios and generated values; no copied tables or drawings.

    Full provenance & artifact record
    Source checked
    2026-10-07
    Use basis
    authored-formula
    Artifact SHA-256
    No retained source artifact hash; see the stated source and verification record.

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