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
Deutsch  English  Francais  Nederlands  Italiano  Español  Português  Suomi  Svenska  Norsk  Dansk  Polska  日本語  Türkiye  中文  Português-br  
• Suitable for signal processing of potential-free outputs, e.g. emergency stop command devices, position switches and solenoid interlocks
• 1 Signalling output
• 2 safety contacts, STOP 0
• 1 safety contact, STOP 1
• Multi-evaluation of up to 6 safety guards
• Fit for signal evaluation of outputs of safety magnetic switches

Ordering details
Product type descriptionSRB211LT/PC
Article number101210355
EAN Code4030661444741
Replaced article number 101211927
Approval USA/CAN
StandardsEN ISO 13849-1, IEC 61508, EN 60947-5-1
PLup e (STOP 0)
bis c (STOP 1)
Control categoryup 4 (STOP 0)
bis 1 (STOP 1)
DC99 (STOP 0)
> 60 (STOP 1)
CCF>65 points
PFH value≤ 2 x 10− 8 / (STOP 0)
≤ 2 x 10
− 7 / (STOP 1)
SILup 3 (STOP 0)
bis 1 (STOP 1)
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 lightSRB211LT
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 contacts, , 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)Yes
Pull-in delay
- ON delay with automatic start130
- ON delay with reset button10, 15
Drop-out delay
- Drop-out delay in case of power failure55
- Drop-out delay in case of emergency stop≤ 20
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 shock10 / 11
Resistance to vibration To EN 60068-2-610…55 HZ, Amplitude 0,35 mm, ± 15 %
Ambient conditions
Ambient temperature
- Min. environmental temperature−25
- Max. environmental temperature+60
Storage and transport temperature
- Min. Storage and transport temperature−40
- Max. Storage and transport temperature+85
Protection class
- Protection class-EnclosureIP40
- Protection class-TerminalsIP20
- Protection class-ClearanceIP54
Air clearances and creepage distances To IEC/EN 60664-1
- Rated impulse withstand voltage4
- Degree of pollution2 To DIN IEC 60664-1
- Overvoltage categoryIII To VDE 0110
Electromagnetic compatibility (EMC)
EMC ratingconforming to EMC Directive
Electrical data
Rated DC voltage for controls
- Max. rated DC voltage for controls20.4
- Max. rated DC voltage for controls28.8
Rated AC voltage for controls, 50 Hz
- Min. rated AC voltage for controls, 50 Hz20.4
- Max. rated AC voltage for controls, 50 Hz26.4
Rated AC voltage for controls, 60 Hz
- Min. rated AC voltage for controls, 60 Hz20.4
- Max. rated AC voltage for controls, 60 Hz26.4
Contact resistance100
Power consumption2.4; 5.9 , plus signalling output
Type of actuationAC/DC
Rated operating voltage24 −15 / +20, residual ripple 10
24 −15 / +10
Operating current
Frequency range50 / 60
Electronic protection (Y/N)Yes
Fuse rating for the operating voltageInternal electronic trip,
tripping current F1: > 750 ,
tripping current F2: > 75
Reset after disconnection of supply voltage
tripping current F3: > 140
Current and tension on control circuits
- S11, S12, S21, S2224 , Test current: 10
- x1, x224 , Test current: 10, Start pulse: 25 / 25
- x1, x324 , Test current: 10, Start pulse: 950 / 10
Bridging in case of voltage drops40
Monitored inputs
- Short-circuit recognition (Y/N)optional
- Wire breakage detection (Y/N)Yes
- Earth connection detection (Y/N)Yes
Number of shutters0
Number of openers2
Cable length1500 with 1.5 ;
2500 with 2.5
Conduction resistance40
- Stop category 137-38:
AC-15: 230 V / 3 A
DC-13: 24 V / 2 A
Stop category0 / 1
- Stop category 013-14, 23-24:
AC-15: 230 V / 1,5 A
DC-13: 24 V / 1,2 A
Number of safety contacts3
Number of auxiliary contacts0
Number of signalling outputs1
Switching capacity
- Switching capacity of the safety contacts(13-14; 23-24) 250 , 8 A ohmic (inductive in case of appropriate protective wiring); 5 , 5
(37-38) 250 , 6 A ohmic (inductive in case of appropriate protective wiring); 10 , 10
- Switching capacity of the signaling/diagnostic outputs24 , 100
Fuse rating
- Protection of the safety contacts8 A slow blow (13-14; 23-24)
6.3 A slow blow (37-38)
- Fuse rating for the signaling/diagnostic outputsInternal electronic trip, tripping current > 0,1 A
Utilisation category To EN 60947-5-1
Number of undelayed semi-conductor outputs with signaling function1
Number of undelayed outputs with signaling function (with contact)0
Number of delayed semi-conductor outputs with signaling function.0
Number of delayed outputs with signalling function (with contact).0
Number of secure undelayed semi-conductor outputs with signaling function0
Number of secure, undelayed outputs with signaling function, with contact.2
Number of secure, delayed semi-conductor outputs with signaling function0
Number of secure, delayed outputs with signaling function (with contact).1
LED switching conditions display
LED switching conditions display (Y/N)Yes
Number of LED´s6
LED switching conditions display
- The integrated LEDs indicate the following operating states.
- Position relay K1
- Position relay K2
- Position relay K3/K4
- Supply voltage
- Internal operating voltage
Miscellaneous data
Applications Emergency-Stop button
Pull-wire emergency stop switches
Guard system
Safety sensor
Safety light curtain
- Width22.5
- Height100
- Depth121
Inductive loads (e.g. contactors, relays, etc.) are to be suppressed by means of a suitable circuit.
notice - Wiring example
Input level: The example shows a 2-channel control of a guard door monitoring with two position switches, whereof one with positive break, external reset button (R) and feedback circuit (H2).
The control recognises cross-short, cable break and earth leakages in the monitoring circuit.
Relay outputs: Suitable for 2 channel control, for increase in capacity or number of contacts by means of contactors or relays with positive-guided contacts.
Time delay: The time-delayed safety enable 37/38 is adjustable for 1 to 30 seconds drop-out delay (see setting intructions).
The safety enabling circuit 37/38 conforms to EN 60204-1 for STOP Category 1. The safety enabling circuits 13/14 and 23/24 conform to EN 60204-1 for STOP Category 0.
Setting of the drop-out delay time is carried out by means of a potentiometer from the front of the enclosure.
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 18.09.2019 - 17:49:04h Kasbase 3.3.0.F.64I