Siemens 3TK28251BB40Product Attribute Attribute Value Series 3TK Series Supply Voltage 24 VDC UPC Code 4011209380691 Voltage, Control 24 VDC Overview SIRIUS 3TK28 Safety Relay, Basic Units The SIRIUS safety relays with relay enabling circuits feature positively driven NO and NC contacts, in pairs, which means if one of the contacts welds, then the other contact is used to shut down the circuit. A positively driven feedback signal contact (NC contact) detects the fault of
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