Electrical Isolator Size Calculator

Formula

To calculate the Electrical Isolator Size (I_s):

\[ I_s = I_l \times S_f \]

Where:

\(I_s\) is the Isolator Size in amperes
\(I_l\) is the Maximum Load Current in amperes
\(S_f\) is the Safety Factor

What is an Electrical Isolator?

An electrical isolator, also known as a disconnector or isolating switch, is a device used in electrical circuits to ensure that a section of the circuit can be completely de-energized for maintenance or service. It is typically used to isolate a part of the circuit from the main power supply, ensuring the safety of personnel working on the circuit. Electrical isolators are commonly used in industrial and commercial settings where high voltage equipment needs to be serviced or repaired.

Example Calculation 1

Let's assume the following values:

Maximum Load Current (\(I_l\)) = 50 A
Safety Factor (\(S_f\)) = 1.25

Using the formula:

\[ I_s = 50 \times 1.25 = 62.5 \text{ A} \]

The Isolator Size is 62.5 A.

Example Calculation 2

Let's assume the following values:

Maximum Load Current (\(I_l\)) = 100 A
Safety Factor (\(S_f\)) = 1.5

Using the formula:

\[ I_s = 100 \times 1.5 = 150 \text{ A} \]

The Isolator Size is 150 A.