Allen-Bradley 440R-N23126 Safety Relay | Replacement, Equivalent & Selection Guide
The Allen-Bradley (Rockwell Automation) 440R-N23126 is a compact, DIN-rail mounted safety relay designed for machine safety applications requiring reliable monitoring of emergency stop circuits, safety gates, and two-hand control devices. This page provides full technical specifications, compatible replacement models, application guidance, and sourcing information to help engineers and procurement teams make confident selection decisions.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 440R-N23126 |
| Brand | Allen-Bradley / Rockwell Automation |
| Series | Guardmaster 440R |
| Function | Safety Relay Module — E-Stop / Safety Gate Monitoring |
| Supply Voltage | 24V DC |
| Safety Category | Category 4 / PLe (EN ISO 13849-1) |
| SIL Rating | SIL 3 (IEC 62061) |
| Output Contacts | 2 x Safety (N.O.) + 1 x Auxiliary (N.C.) |
| Response Time | ≤ 20 ms |
| Mounting | DIN Rail (35 mm) |
| Housing Width | 22.5 mm |
| Operating Temperature | -10°C to +55°C |
| Protection Rating | IP40 (terminal area) |
| Certifications | CE, UL, cUL, TÜV |
| Weight | ~200 g |
Note: Always verify specifications against the official Rockwell Automation datasheet before final design-in.
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as functional replacements or equivalents for the 440R-N23126. Compatibility depends on your specific circuit topology, safety category requirement, and control panel layout — always validate before substitution.
| Brand | Model | Voltage | Safety Category | Notes |
|---|---|---|---|---|
| Allen-Bradley | 440R-N23125 | 24V DC | Cat. 4 / PLe | Same series, single-channel variant — verify I/O count |
| Allen-Bradley | 440R-S13R2 | 24V DC | Cat. 4 / PLe | Guardmaster SI series — expanded diagnostics |
| Pilz | PNOZ s3 (750103) | 24V DC | Cat. 4 / PLe / SIL 3 | Direct functional equivalent; widely stocked |
| SICK | UE10-3OS2D0 | 24V DC | Cat. 4 / PLe | Compact form factor; check terminal layout |
| Schmersal | SRB 301ST | 24V DC | Cat. 4 / PLe | Cost-effective alternative for standard E-stop loops |
| Omron | G9SB-3012-D | 24V DC | Cat. 4 / PLe | Slim DIN-rail mount; verify output contact ratings |
| Siemens | 3SK1111-1AB30 | 24V DC | Cat. 4 / PLe | SIRIUS Safety series; common in EU installations |
⚠ Disclaimer: Cross-reference data is provided for reference only. Konmask.com does not guarantee interchangeability. Consult the OEM datasheet and a qualified safety engineer before substitution in safety-critical systems.
Why Choose the Original Model
- Guaranteed Compatibility: Designed and validated within the Rockwell Automation Guardmaster ecosystem — seamless integration with GuardLogix PLCs and Studio 5000 Logix Designer.
- Certified Safety Performance: Factory-certified to Category 4 / PLe / SIL 3 — no re-validation overhead when using OEM parts.
- Long-Term Support: Backed by Rockwell’s global service network, firmware updates, and documented lifecycle policy.
- Traceability: Full manufacturing traceability and certificate of conformity available — critical for regulated industries (automotive, food & beverage, pharma).
- Reduced Engineering Risk: Using the original part eliminates the need for re-qualification under IEC 62061 or EN ISO 13849-1.
Typical Applications
- Emergency stop (E-stop) circuit monitoring on industrial machinery
- Safety gate / interlocked guard door monitoring
- Two-hand control device safety loops
- Light curtain and safety mat interface circuits
- Robot cell perimeter guarding
- Conveyor and press machine safety control panels
- Packaging, automotive assembly, and material handling lines
System Compatibility
- PLC Platforms: Allen-Bradley GuardLogix 5580 / 5570, CompactLogix 5380 / 5370, MicroLogix (hardwired)
- Safety Networks: Hardwired safety loop (standalone); compatible with CIP Safety via GuardLogix integration
- Software: Studio 5000 Logix Designer (for GuardLogix integration), RSLogix 5000
- Panel Standards: IEC 60204-1, NFPA 79, EN ISO 13849-1, IEC 62061
- DIN Rail: Standard 35 mm EN 60715 rail
Selection Guide
Use the following criteria to confirm the 440R-N23126 is the right choice — or to identify a suitable alternative:
| Selection Criterion | 440R-N23126 | Consider Alternative If… |
|---|---|---|
| Supply Voltage | 24V DC | Your panel uses 110V AC or 230V AC |
| Safety Category | Cat. 4 / PLe / SIL 3 | Application only requires Cat. 2 / PLc — lower-cost options available |
| Output Contacts | 2 N.O. + 1 N.C. | You need 3+ safety outputs — consider 440R-S13R2 or Pilz PNOZ m B0 |
| Monitoring Function | E-stop / Safety Gate | You need speed monitoring, muting, or AOPD — select function-specific relay |
| Form Factor | 22.5 mm DIN | Space-constrained panel — consider 17.5 mm slim variants |
| Budget | OEM pricing | Cost is primary driver — evaluate Schmersal or Omron equivalents |
Quality Assurance & Sourcing
- Source: Konmask.com sources Allen-Bradley components from authorized distributors and verified industrial surplus channels.
- Inspection: All units undergo visual inspection and packaging verification prior to dispatch.
- Documentation: Certificate of conformity and original manufacturer documentation available upon request.
- Condition: New (factory-sealed) stock available; refurbished / tested units clearly labeled.
- Lead Time: In-stock items ship within 1–3 business days; contact us for bulk order lead times.
How to Order
- Confirm your supply voltage, safety category, and output contact requirements against the spec table above.
- Add the 440R-N23126 to your cart, or contact us for a formal quotation.
- For bulk orders (>5 units) or project-based procurement, email support@konmask.com with your BOM.
- Specify required documentation (CoC, test report, datasheet) in your order notes.
- Select your preferred shipping method at checkout — DHL Express, FedEx, or sea freight available.
Replacement & Compatibility FAQ
Q: Can I replace the 440R-N23126 with a Pilz PNOZ s3 without re-validating my safety function?
A: Technically the PNOZ s3 is a functional equivalent, but any component substitution in a safety-rated circuit requires re-validation per EN ISO 13849-1 or IEC 62061. Consult your safety engineer.
Q: Is the 440R-N23126 still in production?
A: Rockwell Automation periodically updates the Guardmaster 440R series. Contact us or check the Rockwell Product Lifecycle page for current status. We maintain stock of both current and legacy variants.
Q: What is the difference between 440R-N23126 and 440R-N23125?
A: The N23125 and N23126 differ in channel configuration and/or output contact count within the same Guardmaster series. Always compare datasheets side-by-side before substitution.
Q: Can this relay be used with a Siemens S7 PLC?
A: Yes — the 440R-N23126 operates as a hardwired safety relay and is PLC-brand agnostic. It can interface with any PLC via its dry-contact safety outputs.
Q: Do you provide a warranty?
A: Yes. New factory-sealed units carry the original manufacturer warranty. Konmask.com also offers a 90-day inspection warranty on all shipped units.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
