Phoenix Contact REL-IR-BL/L- 24AC/4X21 Industrial Relay (Product Code: 1109563)
The Phoenix Contact 1109563 (Type Designation: REL-IR-BL/L- 24AC/4X21) is a plug-in, miniature “ice cube” style industrial power relay designed for signal isolation, logic branching, and circuit amplification within automated electrical systems. Part of the cost efficient ESSENTIAL edition product family, it features a clear composite shroud that permits quick visual health checks of the internal copper coil, status indicators, and mechanical contacts.
Key Features
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4 Changeover Contact Configuration: Features 4 PDT (double pole, double throw / 4 Form C) completely independent contacts, allowing a single control signal to manage up to four separate electrical circuits simultaneously.
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Alternating Current (AC) Voltage Optimization: Equipped with a specialized 24V AC input coil, matching standard auxiliary control loops natively found inside commercial machinery panels and plant switchgear.
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Manual Mechanical Testing: Outfitted with a prominent red test button on the top faceplate, color coded specifically to identify alternating current (AC) coil variants. This lets field technicians manually toggle the relay contacts to test downstream logic paths without needing to power the coil circuit.
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Dual-Layer Diagnostics: Built with an integrated yellow status LED alongside a mechanical position flag indicator, ensuring accurate contact state tracking under any lighting condition.
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Durable Contact Construction: Uses silver nickel (AgNi) alloy contact surfaces that resist arcing wear and micro welding, offering a massive mechanical life expectancy of up to 30,000,000 operational cycles.
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Clear Front Panel Schematic Layout: Printed with a clear pinout circuit diagram directly on the transparent front faceplate (11 through 44 and coil inputs A1 A2), reducing wiring and troubleshooting errors in the field.
Technical Specifications
| Feature | Specification |
| Model Type / Designation | REL-IR-BL/L- 24AC/4X21 |
| Ordering Code / Part Number | 1109563 |
| Brand / Manufacturer | Phoenix Contact |
| Product Family Class | ESSENTIAL edition |
| Nominal Coil Input Voltage | 24V AC (50/60Hz control networks) |
| Contact Arrangement Type | 4 PDT / 4 Changeover Contacts |
| Limiting Continuous Current | 6 A per contact tier |
| Maximum Switching Voltage | 250V AC / 250V DC |
| Physical Dimensions | Width: 22.5mm| Height:28mm | Depth:35.5mm |
| Global Standards & Approvals | cRUus Recognized (UL / CSA compatibility), CE Compliant |
Applications
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Multi Channel Logic Replication: Connects directly into 24V AC machine safety and control strings to duplicate a single status instruction across four distinct safety interlocks, sirens, or control lines simultaneously.
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PLC Circuit Coupling: Interfaces with standard 24V AC programmable logic controller output cards to safely switch higher power industrial loads like heavy duty contactors, magnetic valves, or motor starter blocks.
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HVAC Control Enclosures: Widely implemented in commercial climate control and air handler units where 24V AC step down transformers natively power the primary control infrastructure.
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Galvanic Protection Barrier: Establishes a highly resilient dielectric shield between delicate microelectronic processor components and harsh field loads, protecting the control logic from electrical back EMF surges.
