Siemens 3TK28 User Manual

Description of the individual safety relays
3.8 3TK28 safety relays with contactor relay enabling circuits
3TK28 safety relays
144 Manual, 07/2016, NEB926157502000/RS-AB/003
3.8.2.4
Terminal assignment
Terminal
Description
A1
L/+
A2 N/-
Y11; Y12
Channel 1, EMERGENCY STOP or position switch
Y21; Y22 Channel 2, EMERGENCY STOP or position switch
Y20
Parameterization "single-channel sensor connection"
Y33; Y34
ON button feedback circuit
13 - 14
Contact units (see contact units graphic)
1)
Auxiliary contact units
Figure 3-68 Contact units

Siemens 3TK28 Specifications

General

Type	Safety relay
Mounting Type	DIN rail mounting
Type of Voltage	AC/DC
Control Supply Voltage at DC	24 V
Performance Level According to EN ISO 13849-1	PL e
Category According to EN ISO 13849-1	Category 4
Mechanical Durability	10, 000, 000 cycles
Electrical Durability	100, 000 cycles
Protection Class	IP20
Product Function	Safety Monitoring
Suitability for Use	Emergency stop, safety doors
Supply Voltage Frequency	50/60 Hz
Control Supply Voltage at AC at 50 Hz	24 V
Control Supply Voltage at AC at 60 Hz	24 V
Stop Category	0
SIL According to IEC 61508	SILCL 3
Type of Electrical Connection	Screw Connection
Rated Control Supply Voltage	24 V