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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• 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
• 3 safety contacts, STOP 0;
2 safety contacts, STOP 1 (adjustable 1 … 30 )
• 3 Signalling outputs, 1 Auxiliary contact
• Optional: Short-circuit recognition, Manual reset with edge detection in fail-safe circuit, Automatic reset function

Ordering details
Product type descriptionSRB 324LT-480S
Article number101204855
EAN Code

StandardsEN ISO 13849-1, IEC 61508, EN 60947-5-1
PLup e (STOP 0)
bis d (STOP 1)
Control categoryup 4 (STOP 0)
bis 1 (STOP 3)
DC99 (STOP 0)
> 60 (STOP 1)
CCF> 65 points
PFH value≤ 2,0 x 10-8/ (STOP 0)
≤ 2,0 x 10
- 7/h (STOP 1)
SILup 3 (STOP 0)
bis 2 (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 lightSRB 324LT
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 (monitored)
Start input (Y/N)Yes
Feedback circuit (Y/N)Yes
Start-up test (Y/N)No
Automatic reset function (Y/N)Yes
Reset with edge detection (Y/N)Yes
Pull-in delay
- ON delay with automatic start250
- ON delay with reset button20
Drop-out delay
- Drop-out delay in case of power failure80
- Drop-out delay in case of emergency stop≤ 30, 36
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)Yes
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
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
- Overvoltage categoryIII To VDE 0110
- Degree of pollution2 DIN IEC 60664-1
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 consumption3.2; 7.1 , 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: > 2.5 A; F2 > 50
(S11 - S31), > 800 (x 4);
Reset after disconnection of supply voltage
Current and tension on control circuits
- S11, S12, S21, S22, S31, S3224 , Test current: 10
- X1, X224 , Start pulse: 350 / 15
- X3, X424 , Start pulse: 130 / 80
- X4, X524 , Start pulse: 140 / 15
Bridging in case of voltage drops70
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 length1 channel:
850 with 1.5
1400 with 2.5
2 channel
Conduction resistance40
Stop category0 / 1
Number of safety contacts5
Number of auxiliary contacts1
Number of signalling outputs3
Switching capacity
- Switching capacity of the safety contacts(13-14; 23-24; 33-34) 250 , 8 A ohmic (inductive in case of appropriate protective wiring)
(47-48; 57-58) 250 , 6 A ohmic (inductive in case of appropriate protective wiring)
- Switching capacity of the signaling/diagnostic outputsY1-Y3: 24 / 100 , residual current: 200
Fuse rating
- Protection of the safety contacts10 A quick-blow (13-14; 23- 24)
8 A slow blow (37- 38)
- Fuse rating for the auxiliary contacts2.5 A quick-blow, 2 A slow blow
- Fuse rating for the signaling/diagnostic outputs500 ( Internal electronic trip F3)
Utilisation category To EN 60947-5-1
Number of undelayed semi-conductor outputs with signaling function3
Number of undelayed outputs with signaling function (with contact)1
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.3
Number of secure, delayed semi-conductor outputs with signaling function0
Number of secure, delayed outputs with signaling function (with contact).2
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 K4
- Position relay K3
- Supply voltage
- Internal operating voltage
Miscellaneous data
Applications Guard system
Emergency-Stop button
Pull-wire emergency stop switches
Safety light curtain
Safety sensor
- Width45
- Height100
- Depth121
Inductive loads (e.g. contactors, relays, etc.) are to be suppressed by means of a suitable circuit.
notice - Wiring example
2 channel control shown for a guard-door monitor with two contacts, of which at least one contact has positive break, with external reset button (R).
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.
(H2) = Feedback circuit
The control recognises cross-short, cable break and earth leakages in the monitoring circuit.
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 20.07.2019 - 05:42:07h Kasbase 3.3.0.F.64I