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SIRIUS 3TK28 30 Expansion Unit
The SIRIUS 3TK28 30 Expansion Units are used to increase the number of contacts that can be used on safety related control units. One enabling contact of the base unit is required to connect the expansion unit. The category of a control system with expansion unit corresponds to the category of the basic unit. One basic unit may be connected to several expansion units.

Brand/Series	3TK Series
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• Siemens
  CONTACTOR RELAY 4NO DC 24V SCREW
  
  型號：3RH21401BB40
  倉庫庫存編號：70240002
  
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• Siemens
  CONTROL RELAY, 3NO 1NC, 24VDC COIL, SCREW
  
  型號：3RH11311BB40
  倉庫庫存編號：70267716
  
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• Siemens
  Sirius 3TK28 Safety Relay, Dual Channel, 24 V dc, 3 Safety, 2 Auxiliary
  
  型號：3TK28251BB40
  倉庫庫存編號：70384387
  
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• Siemens
  Sirius 3TK28 Safety Relay, Single Channel, 24 V dc, 2 Safety, 1 Auxiliary
  
  型號：3TK28271BB40
  倉庫庫存編號：70384399
  
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• Siemens
  Sirius 3TK28 Safety Relay, Single Channel, 24 V dc, 2 Safety, 1 Auxiliary
  
  型號：3TK28271BB41
  倉庫庫存編號：70384400
  
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• Siemens
  Circuit Breaker; Supplementary; 1-P; 1A; C Curve; 277 VAC; DIN Mnt; UL 1077
  
  型號：5SY41017
  倉庫庫存編號：70384700
  
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Brand/Series 3TK Series  Siemens Brand/Series 3TK Series  PLC IO Modules Brand/Series 3TK Series  Siemens PLC IO Modules Brand/Series 3TK Series