Short Circuit Current Rating Calculator ((install)) Guide
For unmarked components, use from UL 508A Table SB4.1 (e.g., terminal blocks typically default to
is the maximum short-circuit current that an electrical component (such as a panel, disconnect switch, or industrial control panel) can safely withstand without creating a safety hazard (e.g., fire, arc flash, or component rupture). It is defined by standards such as UL 508A (Industrial Control Panels) and NEC Article 409 . short circuit current rating calculator
: The overall SCCR for the entire panel is generally limited to the lowest SCCR of any individual component or branch circuit within that panel. For unmarked components, use from UL 508A Table SB4
| Component | Manufacturer | Rated SCCR | |-----------|--------------|-------------| | Main disconnect switch | ABB | 10 kA | | Branch circuit breaker | Schneider | 14 kA | | Contactor | Siemens | 5 kA | | Terminal block | Phoenix | 10 kA | | Power supply | Mean Well | 3 kA | | Component | Manufacturer | Rated SCCR |
The power supply has 3 kA , which is lower than all others.
If your panel includes:
An is an essential tool for panel builders, electricians, and design engineers. Whether you use a simple spreadsheet or an advanced manufacturer tool, the goal is the same: ensure your equipment can safely handle the available fault current at its installation point.
