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USB8SR (fitted with eight 1A, high sensitivity signal relays and fixed screw terminal blocks
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USB4PR2 (fitted with four 10A power relays & 2 part (male/female) terminal blocks)
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USB4PR (Four 10A power relays, fixed screw terminal connectors & perspex cover)
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USB8PR2 (Eight 10A power relays and 2 part (male/female) screw terminal connectors)