The RH1B-ULDC12V is a single-pole double-throw (SPDT) compact power relay designed for general-purpose switching applications requiring a 12 VDC coil voltage. This miniature power relay features a 10 A contact capacity with an integrated LED indicator for visual coil status confirmation, making it ideal for control circuits where operator feedback is essential. The relay is available with blade terminal configuration for socket mounting and operates reliably across industrial temperature ranges. Common applications include motor control, solenoid switching, alarm circuits, and automation systems where space savings and reliable switching performance are critical requirements.