8.3 3RK3 Basic central unit
Technical data of the 3RK3 Basic
Device data
Number of sensor inputs (1-channel), safety-related 8
Number of test outputs 2
Number of outputs 1 safety-related two-channel semiconductor output
1 safety-related two-channel semiconductor output
Height
• Screw terminals
• Spring-loaded terminals
111 mm
113 mm
Width 45 mm
Depth 124 mm
Weight 300 g
Typical number of function elements to be processed
1)
250
Electrical data
Supply voltage/
rated control supply voltage Us
Device power supply via power supply unit in accordance with
IEC 60 536 protection class III (SELV or PELV)
24 V DC
Operating range 0.85 to 1.15 x Us
Rated insulation voltage U
i
300 V
Rated impulse voltage U
imp
2.5 kV
2)
Total power consumption 185 mA + 1.5 A semiconductor output
Rated power at Us 4.5 W
Utilization category in accordance with EN 60947‑5‑1
(relay outputs)
• AC-15 at 230 V
• DC-13 at 24 V
(semiconductor outputs)
• DC-13 at 24 V
2 A
1 A
1.5 A; short-circuit-proof up to 10 A
Resetting time
3)
of the safety-related outputs t
RT
420 ms
Mechanical durability
4)
10 x 10
6
switching cycles (relay)
Max. switching frequency z at rated operational current 1000 1/h
Conventional thermal current I
th
(relay/semiconductor) 2/1.5 A
Max. protection of relay contacts with fuses NH type
3NA, DIAZED type 5SB, NEOZED type 5SE
• Operating class gL/gG
• Operating class quick response
4 A
6 A
Safety data according to EN ISO 13849-1
Probability of a dangerous failure per hour (PFH
D
) 5.14 x 10
-9
1/h
Probability of a dangerous failure on demand (PFD) 1.28 x 10
-5
Characteristic values for cables
Technical data
8.3 3RK3 Basic central unit
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 367
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