This Devantech USB relay board provides 8 voltage-free contact latching relay outputs with a current rating of up to 16A each. Controlled and powered from any standard USB bus, no separate power supply is needed. Latching relays stay in their last position when power is removed.
The dS2832 is an Ethernet connected relay module featuring 32 channels of 16Amp 250Vac relays. Each relay has both normally open (NO) and normally closed (NC) as well as the common available on three terminals. 8 flexible I/O channels with a choice of VFC, NPN, or 12-bit analog input.