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Technical specifications for SRB-NA-R-C.33-24V
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Manufacturer:SCHMERSAL
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Product Category:General Automation
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Spare Part Number:SRB-NA-R-C.33-24V
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Estimated shipping dimensions:4.6x14x8cm
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Weight:0.3 kg
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Tariff Code:8537101190
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Counliy of origin:Germany
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Product Type:Safety-monitoring module
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Rated Operating Voltage:24 V AC/DC
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DC Supply Tolerance:-15% / +20%; residual ripple max. 10%
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AC Supply Tolerance:-15% / +6%; 50/60 Hz
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Safety Contacts:3 NO (13-14, 23-24, 33-34)
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Auxiliary Contact:1 NC (41-42), monitoring only
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Monitoring Inputs:T11-T12 and T11-T22
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Reset Input:T33-T34
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Feedback Circuit:X1-X2
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Power Consumption:max. 2.5 VA
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Enabling Contact Rating:230 V AC, 6 A resistive
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Monitoring Contact Rating:24 V, 2 A resistive
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Response Timing:Pick-up max. 20 ms; drop-out max. 50 ms
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Operating Temperature:-25 to +45 °C
Information
Overview
Manuals
Common Applications
Product Precautions
SCHMERSAL SRB-NA-R-C.33-24V is a safety-monitoring module for evaluating emergency-stop devices and positive-break guard-door switches in machine safety circuits.
- Three normally open enabling contacts provide independent safety switching paths.
- A separate normally closed auxiliary contact supports status monitoring only.
- Dedicated terminals support dual-channel inputs, external reset and downstream-contactor feedback.
- Front LEDs identify supply, internal voltage and the two safety-channel states.
The module integrates into fixed machine safety panels where the complete sensor, logic and actuator chain is validated during commissioning.
Important Notice: Match the complete SRB-NA-R-C.33-24V designation, installed wiring arrangement and applicable instruction revision before energization or replacement.
SCHMERSAL SRB-NA-R-C.33-24V Manuals & Downloads
SRB-NA-R-C.33-24V Technical Reference (PDF)SRB-NA-R-C.33-24V Installation & Commissioning Guide (PDF)Important Notice: The Technical Reference consolidates exact-model specifications and interfaces; the Installation & Commissioning Guide provides the manufacturer wiring and acceptance information.
Emergency-stop circuits
Evaluates emergency-stop command devices and opens all three enabling paths when a monitored input opens.
Guard-door monitoring
Processes positive-break guard-switch signals in the documented single- or dual-channel arrangement.
Contactor supervision
Uses the X1-X2 feedback circuit to supervise positively guided downstream contactors or relays.
Legacy safety-panel service
Supports exact-model maintenance where terminal identity, reset behavior and safety validation must be preserved.
Apply these SRB-NA-R-C.33-24V checks to supply, wiring, reset, feedback and output validation before release to service.
1
De-energize A1-A2 and every external contact circuit before installation, removal or conductor work.
2
Confirm the complete SRB-NA-R-C.33-24V designation and the physical unit's applicable instruction revision.
3
Use A1-A2 only with the documented 24 V AC/DC supply and the required protective arrangement.
4
Keep monitoring channels on T11-T12 and T11-T22; do not infer behavior from another SRB variant.
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Use 41-42 only as the auxiliary monitoring contact, never as a safety enabling circuit.
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Wire T33-T34 and X1-X2 according to the selected external-reset and feedback arrangement.
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Apply suitable suppression to inductive loads and keep every contact within its documented switching duty.
8
Function-test sensors, all three enabling contacts, downstream actuators, reset and feedback before release.
Technical notes
Use terminals A1-A2 for the 24 V AC/DC supply; wire the monitored channels through T11-T12 and T11-T22, reset through T33-T34, and the feedback loop through X1-X2. The 41-42 auxiliary contact is for monitoring only, and the complete sensor-logic-actuator safety function must be validated before release.
FAQ View All FAQ
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What supply is specified for SCHMERSAL SRB-NA-R-C.33-24V?The complete -24V designation is listed for 24 V AC/DC. Verify the physical label and the applicable wiring document before energization.
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Which contacts perform the safety function on SCHMERSAL SRB-NA-R-C.33-24V?The three enabling circuits are 13-14, 23-24 and 33-34. The 41-42 auxiliary contact is for monitoring and must not be used as a safety enabling contact.
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How are the two monitoring channels connected on SCHMERSAL SRB-NA-R-C.33-24V?Channel 1 uses T11-T12 and channel 2 uses T11-T22. Select the single- or dual-channel wiring example that matches the validated machine safety design.
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Where are reset and feedback wired on SCHMERSAL SRB-NA-R-C.33-24V?The external reset circuit uses T33-T34. The X1-X2 feedback circuit supervises positively guided downstream contactors or relays.
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What do the front LEDs indicate on SCHMERSAL SRB-NA-R-C.33-24V?UB reports the operating supply, Ui reports the internal operating voltage, and K1 and K2 show the two internal safety-channel states.
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What enabling-contact load is documented for SCHMERSAL SRB-NA-R-C.33-24V?The installation sheet specifies 230 V AC at 6 A for a resistive load. Inductive loads require suitable suppression and circuit protection.
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What response times apply to SCHMERSAL SRB-NA-R-C.33-24V acceptance testing?Published values are up to 20 ms pick-up and up to 50 ms drop-out. Validate the complete sensor-logic-actuator stopping function for the installed machine.
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Which checks are required before releasing SCHMERSAL SRB-NA-R-C.33-24V to service?Confirm secure mounting, intact conductors and terminals, an undamaged enclosure, correct sensor response, correct relay response, reset operation and feedback-loop supervision.
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