Allen-Bradley 440R-C23017 – Dual-Channel Safety Relay | Guardmaster Safety System
Engineering Background
The 440R-C23017 is part of Rockwell Automation’s Guardmaster® safety relay family — a field-proven platform deployed globally in machinery safety circuits requiring IEC 62061 SIL 3 and ISO 13849-1 PLe compliance. Designed for OEM machine builders and system integrators who cannot compromise on functional safety architecture.
Product Positioning
This relay serves as the core safety monitoring device for emergency stop (E-stop) circuits, safety gate interlock loops, and two-hand control systems. It provides automatic or manual reset modes, dual-channel input monitoring, and cross-fault detection — making it the preferred choice for Category 4 / PLe safety loops in industrial automation environments.
Complete Technical Specifications
| Part Number | 440R-C23017 |
| Brand / Manufacturer | Allen-Bradley (Rockwell Automation) |
| Series | Guardmaster® Safety Relay |
| Safety Rating | SIL 3 (IEC 62061) / PLe, Category 4 (ISO 13849-1) |
| Supply Voltage | 24V DC |
| Input Channels | Dual-channel (2-channel monitored) |
| Output Contacts | 3 x Safety (N.O.) + 1 x Auxiliary (N.C.) |
| Reset Mode | Automatic / Manual (selectable) |
| Cross-Fault Detection | Yes |
| Response Time | ≤ 20 ms |
| Operating Temperature | 0 °C to +55 °C |
| Mounting | DIN Rail (35 mm) |
| Protection Rating | IP40 (terminal area) |
| Weight | 250 g (approx.) |
| Certifications | UL, CE, TÜV |
| Dimensions (W×H×D) | 22.5 mm × 99 mm × 114.5 mm |
Proven Application Environments
- Emergency Stop (E-stop) Circuits — IEC 60204-1 compliant stop category 0/1 monitoring
- Safety Gate & Interlocked Guard Monitoring — door switches, tongue interlock devices
- Two-Hand Control Systems — press brakes, stamping machines, hydraulic presses
- Light Curtain & Safety Mat Integration — OSSD output monitoring
- Robot Cell Perimeter Guarding — collaborative and industrial robot safety zones
- Conveyor & Material Handling Lines — pull-cord / rope-pull E-stop monitoring
Engineering Advantages
- ✔ Dual-channel cross-fault detection eliminates single-point failure risk
- ✔ Selectable reset mode (auto/manual) adapts to machine risk assessment requirements
- ✔ Compact 22.5 mm DIN-rail housing minimises control cabinet footprint
- ✔ 3 N.O. safety outputs support redundant contactor control architectures
- ✔ LED status indication for rapid fault diagnosis without instrumentation
- ✔ TÜV / UL / CE certified — accepted by global machine safety auditors
- ✔ Drop-in compatible with existing Guardmaster 440R wiring infrastructure
System Architecture & Signal Flow
The 440R-C23017 monitors two independent input channels (S11/S12 and S21/S22). On power-up or after a reset signal, the relay performs an internal self-test. If both channels are closed and no cross-fault is detected, the three N.O. safety output contacts (13/14, 23/24, 33/34) energise, enabling the downstream load circuit. Any channel opening, cross-fault, or supply loss immediately de-energises all safety outputs within ≤ 20 ms. The N.C. auxiliary output (41/42) provides a feedback signal to the PLC for status monitoring and fault logging.
Sourcing & Quality Verification
- Origin: Genuine Allen-Bradley / Rockwell Automation production
- Traceability: Each unit ships with original manufacturer labelling and date code
- Inspection: Pre-shipment functional verification — input channel continuity, output contact resistance, and reset cycle test
- Packaging: Anti-static bag + foam-lined carton; humidity indicator included for long-haul freight
- Documentation: Certificate of conformity available on request; OEM datasheet provided with every order
Procurement Process
- Enquire / Order — Submit your part number and required quantity via the product page or email support@konmask.com
- Stock Confirmation — We confirm availability and lead time within 1 business day
- Quotation & Payment — Formal proforma invoice issued; T/T, PayPal, and trade-term options available
- Quality Inspection — Pre-shipment check performed and documented
- Shipping — DHL / FedEx / SF Express with full tracking; export documentation included
- After-Sales — 12-month warranty; technical support via email or WhatsApp
Technical FAQ
Q: Can the 440R-C23017 monitor OSSD outputs from a light curtain?
A: Yes. Connect OSSD1 to S11/S12 and OSSD2 to S21/S22. Ensure the light curtain OSSD test pulse width is within the relay’s filter tolerance (refer to Rockwell publication 440R-UM013).
Q: What is the difference between automatic and manual reset?
A: In automatic reset mode, the safety outputs re-energise as soon as both input channels are closed. In manual reset mode, a momentary N.O. pushbutton signal on the reset terminal (X1/X2) is additionally required — mandatory for Category 3/4 applications per ISO 13849-1.
Q: Is this relay compatible with the Guardmaster 440C-CR30 safety controller?
A: The 440R-C23017 operates as a standalone relay and does not require a safety controller. It can, however, feed its auxiliary output into a 440C-CR30 or any PLC digital input for status monitoring.
Q: What certifications are required for CE machinery directive compliance?
A: The 440R-C23017 carries CE marking under the Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. TÜV certification covers SIL 3 / PLe claims. Full declaration of conformity available on request.
Q: Can I order in small quantities?
A: Yes. Konmask.com supports single-unit orders with no minimum order quantity (MOQ). Volume pricing is available for orders of 5+ units.
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