The Siemens 3RB1246-1QG00-0FM0 is a solid-state overload relay with integrated thermistor motor protection, rated 6.3...25 A at AC 110...120 V 50/60 Hz. It adds ground fault monitoring through the connection of an external summation current transformer, giving you three protective functions in one DIN-rail mount: overcurrent, thermistor overtemperature, and ground fault.
What the ratings mean for fit
The 6.3...25 A adjustable range covers most small-to-mid motor loads — think conveyors, pumps, and fans up to about 11 kW at 400 V. The 110...120 V AC control supply ties it to standard North American control voltages; if your panel runs 24 VDC or 230 V, this relay won't pick up. The ground fault monitoring path requires an external summation CT (not included), so factor that into your BOM. Outputs are 1 NO + 1 NC for the overcurrent/thermistor channel and a separate 1 NO + 1 NC for ground fault — both monostable, meaning they drop out on power loss. That's a fail-safe arrangement typical for safety-related motor circuits.