The 8-1393137-8 is a time delay relay designed for delay-on-operate timing applications in industrial control systems. The relay operates across multiple voltage ratings (12 VDC, 24 VDC, 24 VAC, and 120 VAC) with timing ranges from 0.1 seconds to 120 seconds, depending on the specific configuration. Adjustment options include fixed timing, external resistor adjustment, and knob-adjustable settings, with tolerance specifications of ±5% for fixed types and ±10% at the high end of the timing range for resistor-adjustable types. The relay features a typical release time of 100 ms and recycle time of 100 ms, with repeatability of ±3%. Available in multiple case styles (plain case, bracket mount, and bracket mount with test button), this relay is suitable for motor control, process automation, and equipment sequencing applications where precise time delays are required.