Boost Electronics offers Redundant Type Relay Board. Boost Electronics manufactures Automation and Control Accessories. The Redundant Type Relay Board has technical specifications like: No. Of channel: 8 Contact arrangement: 1 no Looping all negative of coil supply: Yes Contact rating at 30 VDC / 240 VAC: 10 amp [ resistive load ] PCB overall dimensions: 150 x 85 L x w mm.