Safety relay module SRM 21 Multi

  • Enclosure width: 22.5 mm
  • 2 NC or 2 change-over contacts can be connected
  • Feedback circuit
  • 2 enabling paths potential-free
  • 1 auxiliary output
  • Manual or automatic start
  • LED indicator for switching condition
  • PL e, SIL CL 3

Technical data

Applied standards EN ISO 13849-1, EN 62061, EN 574, EN 60947-5-1
Enclosure PA66, self-extinguishing UL 94 V-0
Degree of protection enclosure and terminals IP 20 to IEC 60529, protection against contact to VBG 4
Safety-relevant data:
EN ISO 13849-1 Performance Level PL e
Category 4
TM max. 20 years
MTTFd 100 years
DC/DCavg > 99 %
EN 62061 SIL CL 3
PFH 2.15 x 10-9 1/h
SFF 0.9465
Contact material Silver, gold flashed
Mounting DIN rail mounting
Connection screw connection terminals
Cable cross-section 0.2 ... 1.5 mm² (incl. conductor ferrules)
Rated operating voltage Ue 24 VDC -20 % ... +25 %
Rated operating current Ie 0.125 A
Rated operating isolation voltage Ui 250 VAC
Rated impulse withstand voltage Uimp 4 kV
Inputs 2 NC inputs, 1 feedback circuit, 1 start input (monitored)
Outputs 2 enabling paths, 1 transistor output as signalling output
Rated operating current/voltage Ie/Ue enabling paths: 3 A/230 VAC; 5 A/24 VDC
Utilisation category AC-15; DC-13
Contact load capacity 5 mA … 6 A; 5 V ... 250 VAC/DC
Typ. input voltage 24 VDC
Max. load of output circuits 50 mA (short-circuit proof)
Conditional short-circuit current 1000 A
Short-circuit protection supply voltage: 2 A slow blow; enabling paths: 6,3 A qick-acting; 4 A slow blow
Delay on energisation/ deenergisation ≤ 125 ms
Risk time ≤ 0.5 s (switch-on delay)
Simultaneity of input circuits < 0.5 s with two-hand control circuit
Mechanical life > 10 million operations
Display 2 LEDs for inputs, 2 LEDs for outputs, 1 LED for supply voltage, 1 LED for fault
Degree of pollution 2
Overvoltage category III
Ambient temperature –25 °C … +55 °C
Storage and shipping temperature –25 °C … +75 °C
Shock resistance 10 g
Approvals TÜV Nord
Note Inductive loads (contactors, relays etc.) are to be suppressed by suitable circuitry.
Typ. input current 8 mA

Ordering details

Type   Material no.  
Type    Material no.   
Safety relay module SRM 21 Multi stock type Standard versions, in stock or available at short notice 1185607
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