The Siemens 3RV1903-5EA00-0FJ0 is an indicator light with a glow lamp, rated for 380...415V AC/DC, designed as a visual status accessory for the 3RV19 motor starter protector housing family, sizes S00 through S2. It ships with a three-color disc set (red, green, clear), letting you field-select the indication color for the line or load side of the motor branch.
Integration Note
Snaps into the front bezel of the 3RV19 housing — no additional wiring required if the base contactor or overload relay has the auxiliary terminal block populated. The glow lamp is rated for 380...415V AC/DC, intended for direct line-voltage indication.