DK-621-0412-S

The DK-621-0412-S is a relay/contactor manufactured by Deltrol Controls, part of the DK-621 series of electromechanical power switching devices. This component is housed in an enclosed, sealed (-S) package with integral connector-style terminations, enabling rapid plug-in installation and replacement. Members of the DK-621 family are typically configured as single-pole, normally-open (SPST-NO) contacts using silver-alloy contact materials, and are routinely applied to switch AC loads up to approximately 30 A at 240 VAC in industrial duty cycles. Coil voltages vary across the series; standard values include 12 VDC, 24 VDC, and 120 VAC, with the specific coil rating identified by the part number suffix.

Typical applications span industrial machinery, HVAC compressor and heater control, lighting contactors, and power distribution panels where a compact connectorized relay simplifies field maintenance. The sealed construction makes the DK-621-0412-S well suited for high-reliability environments such as defense ground-support equipment, aerospace test consoles, and other systems exposed to dust, moisture, or moderate vibration. Procurement considerations include verifying exact coil voltage, contact configuration, and mounting details against Deltrol’s datasheet. Given Deltrol’s niche product portfolio, lifecycle continuity should be assessed; long-term availability may require strategic stocking, especially for legacy aerospace or defense platforms. The connector-based form factor supports lower mean-time-to-repair by enabling swap-out without soldering, an important factor in mission-critical installations.