Siemens 115 V ac Safety Relay Single or Dual Channel With 4 Safety Contacts

  • RS Stock No. 763-6864
  • Mfr. Part No. 3TK2828-1AJ20
  • Manufacturer Siemens
Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): DE
Product Details

SIRIUS 3TK28 27/28 Safety Relays with Timed Delay

The SIRIUS 3TK28 27/28 Safety Relays with Timed Delay provide the functionality of time delayed contacts within a 45mm housing. The time delay is adjustable for each unit. Two different types offer a time delay from 0.05s up to 3s or 0.5s up to 30s. While standard safety contacts in these units are certified up to Category 4, time delayed outputs only reach a Category 3 level according to EN954-1.

Standard relay enable circuits (positively driven)
Suitable for use with Expansion module 3TK28 30
Single/two-channel sensor connection
Width 45mm


EN 60204-1, EN 92, EN 954-1.

Attribute Value
Supply Voltage 115 V ac
Number of Channels 1, 2
Function Safety Switch/Interlock, Speed/Standstill Monitoring
Safety Contacts 4
Depth 120mm
Length 138.5mm
Width 44.8mm
Discontinued product