Siemens 3TK28 34-2AB20 Safety Relay Press Control Unit, Two Hand Control Unit, Spring Loaded Terminals, 2 NO Enabling Contacts, 24VAC Rated Voltage, 45mm Width: Electronic Relays: Amazon.com: Industrial & Scientific
Siemens 3RN1010-1BB0 0 Thermistor Motor Protection Relay, Screw Terminal, Standard Evaluation Units, 2 LEDs, 22.5mm Width, Auto Reset, 2 CO Contacts, 24VAC/VDC Control Supply Voltage: Overload Relays: Amazon.com: Industrial & Scientific
Siemens - 6ED10551FB000BA2 - Input/Output Module, Number of Inputs: 4, Number of Outputs: 4, Power Required: 120/240VAC: Amazon.com: Industrial & Scientific