Notes Switch travel diagram
  Contact closed
  Contact open
  Setting range
  Break point
  Positive opening sequence/- angle
VS  adjustable range of NO contact
  adjustable range of NC contact
N   after travel
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• 1 Signalling output
• 3 safety contacts, STOP 1
• Drop-out delay can be set between 0,4 to 1,5 s
• Suitable for signal processing of potential-free outputs, e.g. emergency stop command devices, position switches and solenoid interlocks
• Suitable for signal processing of outputs connected to potentials (AOPDs), e.g. safety light grids/curtains
• Fit for signal evaluation of outputs of safety magnetic switches

Ordering details
Product type descriptionSRB031MC-24V/1,1SEC
Article number101190685
EAN Code4250116202256
Approval TÜV
StandardsEN ISO 13849-1, IEC 61508, EN 60947-5-1
PLbis d (STOP 1)
Control categorybis 3 (STOP 1)
DC> 60% (STOP 1)
CCF> 65 points
PFH value2 x 10−7/h (STOP 1)
SILbis 3 (STOP 0)
Mission time20 Years
- noticeThe PFH value is applicable for the combinations listed in the table for contact load (K) (current through enabling paths) and switching cycle number (n-op/y).
In case of 365 operating days per year and a 24-hour operation, this results in the specified switching cycle times (t-cycle) for the relay contacts.
Diverging applications on request.
Global Properties
Permanent lightSRB031MC
StandardsIEC/EN 60204-1, EN 60947-5-1, EN ISO 13849-1, IEC 61508
Compliance with the Directives (Y/N) Yes
Climatic stressEN 60068-2-78
Mountingsnaps onto standard DIN rail to EN 60715
Terminal designationsIEC/EN 60947-1
- Material of the housingsPlastic, glass-fibre reinforced thermoplastic, ventilated
- Material of the contactsAgSn0, Ag-Ni, self-cleaning, positive action
Start conditionsAutomatic or Start button
Start input (Y/N)Yes
Feedback circuit (Y/N)Yes
Start-up test (Y/N)No
Reset after disconnection of supply voltage (Y/N)No
Automatic reset function (Y/N)Yes
Reset with edge detection (Y/N)No
delay time1.1 s
Pull-in delay
- ON delay with automatic starttyp. 100 ms
Drop-out delay
- Drop-out delay in case of power failuredelay time ± 30% for 24 VDC and Duty cycle > 3.5 s
- Drop-out delay in case of emergency stopdelay time ± 30% for 24 VDC and Duty cycle > 3.5 s
Mechanical data
Connection typeScrew connection
Cable section
- Min. Cable section0,25
- Max. Cable section2.5
Pre-wired cablerigid or flexible
Tightening torque for the terminals0,6
Detachable terminals (Y/N)No
Mechanical life10.000.000 operations
Electrical lifetimeDerating curve available on request
restistance to shock30 g / 11 ms
Resistance to vibration To EN 60068-2-610…55 HZ, Amplitude 0,35 mm
Ambient conditions
Ambient temperature
- Min. environmental temperature−25 °C
- Max. environmental temperature+60 °C
Storage and transport temperature
- Min. Storage and transport temperature−40 °C
- Max. Storage and transport temperature+85 °C
Protection class
- Protection class-EnclosureIP40
- Protection class-TerminalsIP20
- Protection class-ClearanceIP54
Air clearances and creepage distances To IEC/EN 60664-14 kV / 2
- Rated impulse withstand voltage Uimp4 kV
- Overvoltage categoryIII To IEC/EN 60664-1
- Degree of pollution2 To IEC/EN 60664-1
Electromagnetic compatibility (EMC)
EMC ratingconforming to EMC Directive
Electrical data
Rated DC voltage for controls
- Max. rated DC voltage for controls20.4 V
- Max. rated DC voltage for controls28.8 V
Rated AC voltage for controls, 50 Hz
- Min. rated AC voltage for controls, 50 Hz20.4 V
- Max. rated AC voltage for controls, 50 Hz26.4 V
Rated AC voltage for controls, 60 Hz
- Min. rated AC voltage for controls, 60 Hz20.4 V
- Max. rated AC voltage for controls, 60 Hz26.4 V
Contact resistancemax. 100 mΩ
Power consumptionmax. 2 W; 4.9 VA
Type of actuationAC/DC
Rated operating voltage Ue24 VDC−15% / +20% residual ripple max. 10%
24 VAC−15% / +10%
Frequency range50 / 60 HZ
Electronic protection (Y/N)Yes
Fuse rating for the operating voltageInternal electronic trip, tripping current > 0,5 A, Reset after approximately 1 second/s
- S11, S12, S21, S2224 VDC, Test current: 10 mA
Bridging in case of voltage dropsapprox. Time delay ± 30% for 24 VDC and Duty cycle > 3.5 s
Monitored inputs
- Short-circuit recognition (Y/N)optional
- Wire breakage detection (Y/N)Yes
- Earth connection detection (Y/N)Yes
Number of shutters0 piece
Number of openers2 piece
Cable length1-channel without cross-wire detection:
1500 m with 1.5 mm²; 2500 m with 2.5 mm²
2-channel with/ without cross-wire detection
Conduction resistancemax. 40 Ω
Stop category0 / 1
Number of safety contacts3 piece
Number of signalling outputs1 piece
Switching capacity
- Switching capacity of the safety contactsmax. 230 VAC, 8 A ohmic ( inductive in case of appropriate protective wiring)
- Switching capacity of the auxiliary contacts24 VDC, 2 A
Fuse rating
- Protection of the safety contacts8 A slow blow
- Fuse rating for the auxiliary contacts2 A slow blow
Utilisation category To EN 60947-5-1AC-15: 230 V / 6 A
DC-13: 24 V / 6 A
Number of undelayed semi-conductor outputs with signaling function0 piece
Number of undelayed outputs with signaling function (with contact)0 piece
Number of delayed semi-conductor outputs with signaling function.0 piece
Number of delayed outputs with signalling function (with contact).1 piece
Number of secure undelayed semi-conductor outputs with signaling function0 piece
Number of secure, undelayed outputs with signaling function, with contact.0 piece
Number of secure, delayed semi-conductor outputs with signaling function0 piece
Number of secure, delayed outputs with signaling function (with contact).3 piece
LED switching conditions display
LED switching conditions display (Y/N)Yes
Number of LED´s4 piece
LED switching conditions display
- The integrated LEDs indicate the following operating states.
- Position relay K1
- Position relay K2
- Supply voltage UB
- Internal operating voltage Ui
Miscellaneous data
Applications Emergency-Stop button
Pull-wire emergency stop switches
Guard system
Safety light curtain
Safety sensor
- Width22.5 mm
- Height100 mm
- Depth121 mm
Inductive loads (e.g. contactors, relays, etc.) are to be suppressed by means of a suitable circuit.
notice - Wiring example
To secure a guard door up to PL 4 and Category #03#
Monitoring 1 guard door(s), each with a magnetic safety sensor of the BNS range
The feedback circuit monitors the position of the contactors Ka and Kb.
If only one external relay or contactor is used to switch the load, the system can be classified in Control Category 3 to EN 954-1, if exclusion of the fault “Failure of the external contactor” can be substantiated and is documented, e.g. by using a reliable down-rated contactor. A second contactor leads to an increase in the level of security by redundant switching to switch the load off.
Automatic start: The automatic start is programmed by connecting the feedback circuit to the terminals X1/X2. If the feedback circuit is not required, establish a bridge
The wiring diagram is shown with guard doors closed and in de-energised condition.

K.A. Schmersal GmbH & Co. KG, Möddinghofe 30, D-42279 Wuppertal
The data and values have been checked throroughly. Technical modifications and errors excepted.
Generiert am 24.07.2019 - 01:40:19h Kasbase 3.3.0.F.64I