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Siemens 3TK28 30-1CB30 Safety Relay Expansion Unit, Screw Terminals, 4 NO Enabling Contacts, 24VAC/VDC Rated Voltage, 22.5mm Width: Electronic Relays: Amazon.com: Industrial & Scientific
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Siemens - 3TK28271AL20 - Sirius 3TK28 Safety Relay, Single Channel, 230 V ac, 2 Safety, 1 Auxiliary - RS
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