The JY-18H-K is a 1-pole power relay from Fujitsu's JY Series, specifically configured as a 5A single-contact type with an 18VDC rated coil voltage. It features gold-plated silver cadmium oxide contacts with a maximum contact resistance of 100 mOhm (at 6 VDC, 1A), rated for 5A at 250VAC / 30VDC with maximum switching power of 1,250VA and 150W. The relay operates over a temperature range of -40°C to +90°C, with a coil resistance of 1,620 Ohm (±10%) and a rated power of 360 mW at 20°C. It achieves mechanical life of minimum 20 × 106 operations and electrical life of minimum 100 × 10³ operations, with operate and release times of maximum 6 ms and 3 ms respectively. The device is housed in a plastic sealed enclosure (RTIII) with DIL pitch terminals, socket mounting capability, and is UL, CSA, and VDE recognized, making it suitable for industrial control, automation, and switching applications requiring reliable medium-load performance.