A 5piece set of SMIHS relay modules designed for reliable DC control of AC loads. This package includes relays from the SMIHS family with coil voltages of 5VDC, 12VDC, and 24VDC, and a 4pin footprint suitable for straightforward integration. Each relay is rated for 16A at up to 250VAC, making them suitable for common mains switching tasks while providing electrical isolation between the control and load circuits. Key benefits Flexible coil voltages: includes SMIHS105LM (5VDC), SMIHS112LM (12VDC), and SMIHS124LM (24VDC) variants, allowing selection to match your control circuitry without extra components. switching capacity: 16A at 250VAC, enabling reliable control of lights, fans, pumps, heating elements, and other low to moderateload AC devices. Simple 4pin design: easy to mount and wire, with two pins for the coil and two pins for the contact path, simplifying PCB or terminal mounting. Versatile pack: five relays in a single package provide a convenient, readytouse supply for projects or small production runs. Key attributes Model family: SMIHS series relays (variants include SMIHS105LM, SMIHS112LM, SMIHS124LM) Coil voltages: 5VDC, 12VDC, 24VDC Contact rating: 16A at 250VAC Configuration: 4 pins (two coil pins and two contact pins) for straightforward wiring Package: five relays included in the set Function: DCcontrolled relays suitable for switching AC mains loads Applications and use cases Home automation and hobby projects: use with a microcontroller or SBC to switch lighting, fans, or pumps via safe relay isolation, controlled by a lowvoltage DC signal. Small industrial control: drive heaters, motors, or solenoids in compact automation setups where mains voltage switching is required, with electrical isolation between the control circuit and the load. Prototyping and smallbatch production: a readytouse fiverelay pack that covers multiple coil voltages, allowing quick experimentation and deployment without sourcing individual relays. Notes on integration Ensure proper control circuitry to drive the relay coils from the chosen DC voltage (5V, 12V, or 24V) with appropriate driving current and flyback protection. Adhere to electrical safety guidelines when wiring mainspowered loads to the relay contacts. Verify that the switched load does not exceed the 16A at 250VAC rating, and consider derating for inductive loads or inrush currents. This package provides a mix of coilvoltage variants, so select the relays that match your controller's output voltage for reliable operation. In summary, this fivepiece SMIHS relay set offers flexible coil voltage options (5V, 12V, 24V), a robust 16A/250VAC contact rating, and a compact 4pin design suitable for PCB mounting, enabling safe and dependable control of AC loads from lowvoltage control signals across a range of hobbyist and light industrial applications.