What is the load capacity of a 32 amp MCB in watts?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The load capacity of a 32-amp MCB (Miniature Circuit Breaker) depends on the voltage:
For single-phase systems:
- At 230V: 32A × 230V = 7,360 watts (7.36 kW)
- At 240V: 32A × 240V = 7,680 watts (7.68 kW)
For three-phase systems:
- At 400V: √3 × 400V × 32A = 22,166 watts (22.2 kW)
In practice, you should load an MCB to only 80% of its rated capacity for continuous loads, so plan for approximately 5.9 kW (single-phase) or 17.7 kW (three-phase) for continuous operation.
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