A high-reliability safety evaluation unit designed for Stop Category 1 applications. Featuring two instantaneous NO contacts and one time-delayed NO contact (adjustable from 0.05 to 3 seconds) for controlled machine deceleration.
Input Voltage
24 V DC
Safety Rating
SIL 3 / PL e
Key Features
Adjustable Delay: 0.05s to 3s
Screw terminal connection system
22.5mm compact industrial housing
A1
A2
MODEL 3TK2828
Delay Settings
13
14
22.5mm Standard Width
Technical Specifications
Electrical Data
Supply Voltage
24 V DC
Power Consumption
2.5 W
Operating Range
0.85 ... 1.15 Us
Contact Configuration
Instantaneous NO
2 Contacts
Delayed NO
1 Contact
Switching Capacity (AC-15)
3 A (230V)
Safety & Housing
Safety Integrity Level
SIL 3
Performance Level
PL e
Enclosure Rating
IP40 / IP20
Stop Category 1: Switching Logic
Control Input (A1/A2)
E-STOP TRIGGER (at 33.3%)
Instant Contacts (13/14, 23/24)
Delayed Contacts (37/38)
Adjustable Delay (0.05 - 3.0s)
(Depicted as the interval between E-STOP trigger and delayed contact release.)
Wiring & Terminal Mapping
A1
Y1
Y2
--
FRONT VIEW
14
24
38
A2
A1 / A2
Control Supply Voltage (24V DC)
13 / 14 & 23 / 24
Instantaneous Safety Contacts (NO)
37 / 38
Time-Delayed Safety Contact (NO)
Y1 / Y2
Feedback / Start Circuit
Note: Tightening torque for terminal screws: 0.8 ... 1.2 Nm (approx. 7 to 10.5 lb-in). Ensure correct polarity for 24V DC supply on A1/A2.
Documentation
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Technical Support
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