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3TK2828-1BB41 | Siemens 3TK28 Series Single-Channel Speed/Standstill Monitoring Safety Relay, 24V dc, 2 Safety Contact(s) | RS
3TK2825-1BB40 | Siemens 3TK28 Series Dual-Channel Safety Switch/Interlock Safety Relay, 24V dc, 3 Safety Contact(s) | RS
3TK2828-1AB21 | Siemens 3TK28 Series Single/Dual-Channel Speed/Standstill Monitoring Safety Relay, 24V ac, 4 Safety Contact(s) | RS
3TK2827-1BB40 | Siemens 3TK28 Series Single-Channel Speed/Standstill Monitoring Safety Relay, 24V dc, 2 Safety Contact(s) | RS
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