Allen-Bradley MSR126.1T (440R-N23114) Safety Relay | Replacement, Equivalent & Selection Guide
The Allen-Bradley MSR126.1T (catalog number 440R-N23114) is a dual-channel safety relay module designed for emergency stop, safety gate, and light curtain monitoring applications. It provides reliable safety circuit monitoring up to Safety Integrity Level 3 (SIL 3) and Category 4 / PLe per ISO 13849-1, making it a cornerstone component in industrial machine safety systems.
Technical Specifications
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Catalog Number: 440R-N23114
- Model: MSR126.1T
- Supply Voltage: 24 V DC
- Safety Category: Category 4 / PLe (ISO 13849-1), SIL 3 (IEC 62061)
- Output Contacts: 2 x Safety (NO) + 1 x Auxiliary (NC)
- Input Channels: Dual-channel (monitored)
- Response Time: ≤ 20 ms
- Operating Temperature: 0 °C to +55 °C
- Mounting: DIN rail (35 mm)
- Housing Width: 22.5 mm
- Protection Rating: IP40 (front panel)
- Certifications: CE, UL, cUL, TÜV
- Weight: ~100 g
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as functional equivalents or drop-in replacements for the MSR126.1T. Always verify wiring diagrams and safety ratings before substitution.
- Pilz PNOZ X3 (774310) — 24 V DC, Cat. 4 / PLe, 2 NO + 1 NC; widely used direct equivalent
- Pilz PNOZ X3P (777310) — Plug-in base version for easier replacement without rewiring
- Schmersal SRB301ST — 24 V DC, dual-channel, Cat. 4; compatible footprint in many panel layouts
- SICK UE10-3OS2D0 (6024900) — Compact safety relay, 24 V DC, SIL 3 / PLe
- Omron G9SA-321-T075 — 24 V DC, 3 safety outputs, Cat. 4; suitable for E-stop and gate monitoring
- Siemens 3TK2826-1BB40 — 24 V DC, dual-channel, SIL 3 / Cat. 4; common in Siemens-based panels
- Banner Engineering SC26-2 (28505) — 24 V DC, 2-channel, Cat. 4 / PLe; compact DIN rail mount
Note: Konmask.com stocks the original Allen-Bradley 440R-N23114. Third-party equivalents listed above are for reference only. Contact us to confirm availability and compatibility for your specific application.
Why Choose the Original Model
- Guaranteed OEM Performance: Factory-tested to Rockwell Automation specifications with full traceability
- Seamless Integration: Native compatibility with Allen-Bradley GuardLogix, CompactLogix, and Safety PLC ecosystems
- Certified Safety Ratings: TÜV-certified SIL 3 / PLe — no re-validation required when replacing like-for-like
- Long-Term Support: Backed by Rockwell Automation’s global service network and firmware update path
- Regulatory Compliance: Meets CE, UL, and cUL requirements out of the box for global machine builders
Typical Applications
- Emergency stop (E-stop) circuit monitoring on industrial machinery
- Safety gate and interlocked guard door monitoring
- Light curtain and safety mat interface
- Two-hand control safety circuits
- Robotic cell perimeter guarding
- Conveyor and press machine safety loops
- Packaging and palletizing line safety integration
System Compatibility
- Allen-Bradley / Rockwell: GuardLogix 5570/5580, CompactLogix 5370/5380, SmartGuard 600
- Safety Bus Protocols: Hardwired safety loop (standalone); compatible with DeviceNet Safety and EtherNet/IP Safety when used with appropriate gateway modules
- Panel Standards: Suitable for NFPA 79, ISO 13849, and IEC 62061 compliant machine control panels
- Power Supply: Standard 24 V DC SELV/PELV power supplies (e.g., Allen-Bradley 1606-XLP series)
Selection Guide
Use the criteria below to confirm the MSR126.1T is the right safety relay for your application, or to identify a suitable alternative:
- Required Safety Level: If your risk assessment demands SIL 3 / Cat. 4 / PLe → MSR126.1T is fully qualified
- Supply Voltage: 24 V DC panel? → Direct fit. 115/230 V AC panel? → Consider 440R-N23119 (AC version) or Pilz PNOZ X3 AC variants
- Number of Safety Outputs: Need more than 2 NO outputs? → Evaluate MSR127 (3 NO) or Pilz PNOZ X5
- Manual vs. Automatic Reset: MSR126.1T supports both; confirm jumper configuration before installation
- Footprint Constraint: 22.5 mm DIN rail width — verify panel space before ordering a wider equivalent
- Budget vs. OEM: For cost-sensitive retrofits, Pilz PNOZ X3P (plug-in base) reduces rewiring labor; original AB part recommended for new builds and warranty-sensitive installations
Quality Assurance & Sourcing
- Source: Authorized distribution channels and verified surplus stock with full documentation
- Inspection: Each unit visually inspected; date codes and lot numbers recorded
- Packaging: Original OEM packaging where available; anti-static protective packaging for all units
- Documentation: Certificate of conformity and datasheet provided upon request
- Warranty: 12-month warranty against manufacturing defects
- Counterfeit Prevention: Sourced exclusively from traceable supply chains; hologram and label verification performed
How to Order
- Online: Add to cart directly on this page — stock availability shown in real time
- Bulk / Project Inquiry: Email support@konmask.com with quantity, required delivery date, and project details for a custom quote
- Phone / WhatsApp: +0086 19859288691 (Mon–Fri, 09:00–18:00 CST)
- Lead Time: In-stock orders ship within 1–2 business days; special orders 5–10 business days
- Export: International shipping available; export documentation (CO, packing list, commercial invoice) provided
Replacement & Compatibility FAQ
Q: Is the 440R-N23114 the same as the MSR126.1T?
A: Yes — 440R-N23114 is the Allen-Bradley catalog number for the MSR126.1T safety relay module.
Q: Can I replace the MSR126.1T with a Pilz PNOZ X3 without rewiring?
A: In most cases yes, as the terminal layout is similar, but always verify against your specific wiring diagram and confirm the safety rating meets your risk assessment.
Q: Does the MSR126.1T support automatic reset?
A: Yes — it supports both manual and automatic reset modes, selectable via internal jumper configuration.
Q: What is the difference between MSR126.1T and MSR126.1TP?
A: The MSR126.1TP uses a plug-in terminal base (440R-A17T2) for tool-free replacement without disconnecting field wiring.
Q: Is this product RoHS compliant?
A: Yes, the Allen-Bradley 440R-N23114 complies with RoHS 2 (2011/65/EU) and REACH regulations.
Q: Can Konmask.com provide a datasheet or certificate of conformity?
A: Yes — contact support@konmask.com with your order number or inquiry and we will provide full documentation.
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