Safety relay module SRM 21 RT2

  • Enclosure width: 22.5 mm
  • 2 NC or 1 NC/1 NO contact can be connected
  • Feedback circuit
  • 2 enabling paths
  • 1 transistor output
  • Manual or automatic reset
  • LED indicator for switching condition
  • Crossed wire monitoring

Technical data

Applied standards EN ISO 13849-1, EN 62061, EN 60204-1, BG-GS-ET-20, EN 60947-5-1, EN 60947-5-3, EN 61326-3-1
Enclosure polycarbonate, black
Tightening torque screw connection terminals: approx. 0.8 Nm
Degree of protection enclosure IP 40, terminal block IP 20 to IEC/EN 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 > 113 years
DC/DCavg > 99 %
EN 62061 SIL CL 3
PFHd 3 x 10-8 1/h
hop 8 h/day
dop 220 days/year
tzyklus 30 s
EN 60204-1 stop category 0
Contact material Silver, gold flashed
Mounting DIN rail mounting
Connection screw connection terminals with + and - screws
Cable cross-section min. 1x 0.5 mm² (AWG 20) including conductor ferrules, max. 1x 2.5 mm² (AWG 14) including conductor ferrules, 2x 1.5 mm² (AWG 16) including conductor ferrules
Rated operating voltage Ue 24 VDC ±15 %
Rated operating current Ie 0.125 A
Rated operating isolation voltage Ui 250 VAC
Rated impulse withstand voltage Uimp 4 kV
Conditional short-circuit current 100 A
Inputs 1 NC/1 NO contact or 2 NC contacts, 1 feedback circuit, 1 start input (monitored)
Outputs 2 enabling paths, 1 transistor output as signalling output
Rated operating current/voltage Ie/Ue to EN 60947-5-1: 2 A/230 VAC; 1 A/24 VDC
to CSA: B300/R300, 250 VAC
Conventional thermal current Ithe 5 A
Utilisation category AC-15; DC-13
Contact load capacity min. 10 mA
Typ. input voltage 20 VDC
Max. load of signalling output 20 mA
Short-circuit protection power supply 2A slow blow, enabling paths 6 A gG/gN fuse
Delay on energisation/ deenergisation ≤ 20 ms
Risk time ≤ 0.5 s (switch-on delay)
Attendance delay tv < 200 ms
Mechanical life > 50 million operations
Display 1 LED for supply voltage, 1 LED each for input A and B, 1 LED for authorisation
Degree of pollution 2
Overvoltage category III
Ambient temperature –22 °C … +55 °C
Storage and shipping temperature –22 °C … +70 °C
Relative humidity 10 % ... 90 %
Shock resistance 15 g
Approvals
Note Inductive loads (contactors, relays etc.) are to be suppressed by suitable circuitry.
The safety-related data are based on a load of 24 V / 1 A / DC-1 for the enabling paths. With higher load currents for the enabling paths and other requirement rates nop, the safety-related data vary from the given data and can be provided on request.
Typ. input current 22 mA

Ordering details

Type   Material no.  
Type    Material no.   
Safety relay module SRM 21 RT2 stock type Standard versions, in stock or available at short notice 1179203
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