Phoenix Contact REL-IR-BL/L- 12DC/4X21 Industrial Relay (Product Code: 1109557)
The Phoenix Contact 1109557 (Type Designation: REL-IR-BL/L- 12DC/4X21) is a plug in, miniature “ice cube” style industrial power relay designed for signal isolation, logic multiplication, and power amplification in automated electrical systems. Housed in a transparent, protective enclosure, this relay features a highly dense multi pole configuration optimized for space savings and clean system interfacing. It belongs to the ESSENTIAL edition product family, which balances cost efficiency with standard functional safety requirements.
Key Features
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4 Changeover Contact Configuration: Outfitted with 4 PDT (4 Form C / changeover) independent contacts, allowing a single low power signal to simultaneously switch up to four completely isolated downstream circuits.
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Integrated Test Button and Position Diagnostics: Built with a front accessible mechanical test lever and integrated yellow status LED, enabling commissioning technicians to manually cycle the contacts and verify downstream loop logic effortlessly.
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Compact Footprint (22.5 mm Width): Designed to seat seamlessly inside narrow, space efficient plug in relay sockets, minimizing spatial consumption inside competitive distribution boards.
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Silver Nickel (AgNi) Power Contacts: Outfitted with durable silver nickel 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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Polarized 12V DC Coil: Built with predefined coil polarities for accurate integration within direct current machinery logic architectures.
Technical Specifications
| Feature | Specification |
| Model Type | REL-IR-BL/L- 12DC/4X21 |
| Ordering Code / Part No. | 1109557 |
| Brand / Manufacturer | Phoenix Contact |
| Product Family Class | ESSENTIAL edition |
| Nominal Coil Input Voltage | 12V DC |
| Contact Arrangement Type | 4 PDT (4 Changeover Contacts) |
| Limiting Continuous Current | 6 A per contact tier |
| Maximum Switching Voltage | 250V AC / 250V DC |
| Typical Coil Current (I_N) | 63mA |
| Physical Dimensions | Width: 22.5mm | Height: 28mm | Depth: 35.5m |
| Operational Temperature Window | -40degree C + 70degree C |
| Global Standards & Certifications | cURus Recognized, CE Compliant |
Applications
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PLC Output Signal Multiplication: Interfaces with low voltage 12V programmable logic controller cards to safely branch off interlocking control instructions to four distinct sub systems simultaneously.
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Low Voltage Battery Protection Loops: Heavily utilized inside telecommunication power enclosures, remote solar arrays, and mobile battery systems that natively function on low voltage 12V DC supply rails.
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Industrial Panelboard Automation: Serves as a modular coupling node within assembly line control centers, textile machinery, packaging conveyors, and food processing infrastructure.
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Galvanic Protection Isolation Gates: Creates a robust dielectric barrier between delicate electronic command processors and aggressive field loads, such as high current motor starter coils and heating elements.
