ACB LSIG Setting Calculator
Review ACB LSIG protection settings from the breaker sensor reference and the long-time, short-time, instantaneous, and ground-fault inputs supported by the calculator.
What this utility does
The ACB LSIG Setting Calculator provides a preliminary reference for converting the entered sensor or In value and protection multipliers into pickup-current values. It is intended to make the relationship between the settings visible before the exact breaker model and protection scheme are reviewed.
How to use
- Enter the breaker sensor or reference current used by the calculator.
- Enter the supported L, S, I, and G multipliers or settings shown on the page.
- Review the resulting pickup currents and units for each protection function.
- Compare the result with the exact ACB manufacturer setting ranges, installed trip unit, system fault study, conductor protection, and coordination requirements before applying settings.
Practical notes
- LSIG terminology and setting ranges vary between breaker families and trip units. The same label does not guarantee identical implementation or time-current behavior.
- Long-time, short-time, instantaneous, and ground-fault settings interact with the system and with upstream or downstream devices; a simple pickup-current calculation does not establish selectivity.
- Ground-fault protection also depends on the system earthing arrangement and the measurement or sensing method used by the installed equipment.
- Use manufacturer documentation and the project protection study for final settings. This page is a preliminary engineering reference, not a commissioning or compliance approval.