// CONTROL TECHNOLOGY

Safety relay module
SRM 21 RT2

Features/Options

  • 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
  • Switching position indication by LED

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SRM 21 RT2

Ordering details

Technical data

Standards IEC/EN 60204-1, EN 60947-5-1, EN 954-1, BG-GS-ET 20
Enclosure black polycarbonate; polyamide terminal clamps, top hat section rail mounting to EN 50022
Termination screw terminals with + and - screws
Cable section 1x 2.5 mm2/2x 1.5 mm2 strand including conductor ferrules, 1x 4 mm2/2x 2.5 mm2 massive
Protection class Enclosure IP 40, Terminal block IP 20 to IEC 60529, shock protection to VBG 4
Ue 24 VDC ±15 %
Power consumption approx. 2.5 W
Inputs 1 NC/1 NO contact or 2 NC contacts
1 feedback input, 1 reset input
Outputs enabling paths: positive-guided contacts, 1 transistor output as signalling contact
Utilisation category AC-15; DC-13
Ie/Ue enabling paths 3 A/230 V; 2 A/24 V
Max. output current transistor output Ia 20 mA
Max. fuse rating Ue 2 A gL/gG D-fuse
Max. fuse rating Enabling paths 6 A gL/gG D-fuse
Classification stop category 0. Control category 4
Dropout delay < 20 ms
Mechanical life > 50 million operations
LED indications 4: operation, authorisation, inputs A and B
Degree of pollution 3 to DIN VDE 0110
Overvoltage category III
Ambient temperature 0 °C … +55 °C

    Wiring example magnetic safety sensor 2NC

    Wiring example magnetic safety sensor 1NC/1NO

    Wiring example emergency-stop push button 2NC