SPDT high-current relays use one Form C contact set to switch a single circuit between normally open and normally closed connections, making them useful for basic on/off control or changeover applications. DPDT high-current relays use two Form C contact sets that switch together, allowing one control signal to operate two circuits or provide more coordinated switching.

When specifying high-current relays, verify that the control voltage matches the available supply, since the assortment includes 12 VDC-only options and relays selectable for 12 or 24 VDC operation, along with control through positive or negative trigger inputs, infrared, or Ethernet. Review trigger current and contact capacity separately, including low-current inputs around 1.2 milliamps, relay contacts rated up to 7 amps at 28 or 30 VDC, and total supply requirements such as eight outputs sharing up to 10 amps.

High-current relays are available for surface mounting, free-standing installation, standard snap track, DIN rail panels, centralized control panels, and compact mounting with double-sided tape. Wiring options include SPDT or DPDT Form C dry contacts, normally open or normally closed configurations, screw terminals, positive or negative trigger inputs, and control through infrared, Ethernet, or Power over Ethernet on compatible modules.

Select a relay configuration that matches the number of outputs, such as an eight-channel unit, four-relay module, or grouped single-relay modules, with each channel controlled independently. Then verify the required operating voltage, contact configuration such as SPDT or DPDT, contact rating, and load type, especially when switching high-inrush loads, motors, lighting, or access-control devices.