Siemens 3TK28 User Manual

Description of the individual safety relays
3.8 3TK28 safety relays with contactor relay enabling circuits
3TK28 safety relays
142 Manual, 07/2016, NEB926157502000/RS-AB/003
3.8.2
3TK2850 / 3TK2851 / 3TK2852 safety relay
3.8.2.1
Applications
Applications of the 3TK285 safety combination
You can use the 3TK285 safety combination in EMERGENCY STOP devices according to
DIN EN / IEC 60947-5-5 and in safety circuits according to DIN EN / IEC 60204-1, e.g. for
movable guards and protective doors. Depending on the external circuitry, a maximum
performance level PL
d
/ Cat. 3 in accordance with DIN EN ISO 13849-1 or SILCL 2 in
accordance with IEC 62061 can be achieved with this device.
3.8.2.2
Description of function and connection information
The solid-state 3TK285 safety combination has two contactor relays The operating state and
functioning are indicated by three LEDs.
All internal parts of the circuit are cyclically monitored for faults during operation.
Connect the EMERGENCY STOP button or the position switch to terminals Y11, Y12, and
Y21, Y22.
The ON button is connected to Y34 and L+ (24 DC). Terminals Y33, Y34 are jumpered
during autostart operation. Y20 and Y21 are jumpered during 1-channel operation.

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