Circuit Breaker Size Calculator vs Transformer Sizing Calculator
Two calculators for the same neighbourhood of questions. Here is what each measures, what you feed in, and where you'd reach for one over the other.
Circuit Breaker Size Calculator
Determine the correctly sized circuit breaker for any electrical load, accounting for continuous versus non-continuous use, ambient temperature, and safety margins. Use it before wiring a new circuit or replacing a breaker.
- Answers
- Minimum Breaker Size (amps)
- Inputs
- Total Circuit Load, Load Type, Ambient Temperature, Safety Factor
Transformer Sizing Calculator
Determine the minimum transformer kVA rating needed for a given electrical load, accounting for demand factor, power factor, safety margin, and ambient temperature derating. Use this when specifying or replacing distribution transformers on new or existing electrical systems.
- Answers
- Required Transformer Size (kVA)
- Inputs
- Total Connected Load, Demand Factor, Safety Factor, Load Power Factor, Ambient Temperature
At a glance
| Circuit Breaker Size Calculator | Transformer Sizing Calculator | |
|---|---|---|
| Category | Electrical Home | Electrical |
| Answers | Minimum Breaker Size | Required Transformer Size |
| Inputs | 4 | 5 |
| Result unit | amps | kVA |
When to use each
Determine the correctly sized circuit breaker for any electrical load, accounting for continuous versus non-continuous use, ambient temperature, and safety margins. Use it before wiring a new circuit or replacing a breaker.
Determine the minimum transformer kVA rating needed for a given electrical load, accounting for demand factor, power factor, safety margin, and ambient temperature derating. Use this when specifying or replacing distribution transformers on new or existing electrical systems.