$ 115.00
Reliable 24V DC relay with 4 changeover contacts, LED indicator, and surge protection. Built for industrial automation with long service life.
The Phoenix Contact REL-IR4/LDP-24DC/4X21 Single Relay (2903677) is a durable and efficient solution for switching tasks in industrial automation. It integrates four changeover contacts, a visible LED indicator, a freewheeling diode, and a mechanical position display, ensuring operators can monitor and control operations with confidence. Built for a 24 V DC supply, the relay supports a broad input range, delivering stability even in fluctuating environments. With a mechanical service life exceeding 20 million cycles, it offers long-lasting reliability, while its compact plug-in format simplifies integration into existing systems.
Designed for demanding industrial use, the Phoenix Contact REL-IR4/LDP-24DC/4X21 combines safety, efficiency, and ease of maintenance in one compact device. The built-in LED allows quick status recognition, while the diode safeguards connected equipment from damaging voltage surges. Its ability to handle up to 6 A switching capacity makes it versatile for applications such as machine control, process monitoring, and safety circuits. Rugged construction ensures dependable operation in harsh conditions, while certifications from international bodies enhance its suitability for global use. This relay helps engineers achieve reliable switching performance, reduced downtime, and longer equipment life in real-world applications.
The Phoenix Contact REL-IR4/LDP-24DC/4X21 stands out because it blends reliability, durability, and ease of monitoring in one compact relay. With four changeover contacts, LED indication, and a protective freewheeling diode, it gives engineers confidence that their control circuits will perform flawlessly. Its robust construction and long service life make it a smart investment for automation systems that cannot afford downtime.
In modern automation, unstable switching and equipment stress can lead to costly failures. The REL-IR4/LDP-24DC/4X21 solves this by providing safe, stable, and surge-protected switching for a wide range of loads. Its built-in diode prevents voltage spikes, while the LED display enables instant operational feedback. This means reduced troubleshooting time, improved equipment lifespan, and greater efficiency in industries where reliability is mission-critical.
| Feature | Details | Benefit |
|---|---|---|
| Relay Type | Single relay, 4 changeover contacts | Flexible switching for multiple circuits in one compact device |
| Nominal Input Voltage | 24 V DC (range 18.7 V – 46.8 V DC) | Wide operating tolerance ensures stability in varying power conditions |
| Contact Material | AgNi (Silver Nickel) | High conductivity with durability for industrial loads |
| Switching Capacity | Up to 6 A, 250 V AC/DC | Handles demanding loads with safe, reliable switching |
| Status Indication | Yellow LED | Quick and easy visual feedback of relay status |
| Protective Circuit | Integrated freewheeling diode | Protects equipment from harmful voltage spikes |
| Service Life | ~20 million mechanical cycles | Long operating life reduces maintenance and replacement costs |
| Response/Release Time | 13 ms / 14 ms typical | Fast switching improves system responsiveness |
| Mounting Style | Plug-in with compatible relay bases | Simple installation and easy replacement |
| Ambient Temperature Range | -40 °C … +70 °C operation | Reliable in harsh and varied environmental conditions |
| Approvals | CSA, VDE, cULus Recognized | Meets global compliance for safety and quality |
| Dimensions (W x H x D) | 21.2 x 27.5 x 35.6 mm | Compact design saves panel space |
| Mechanical Position Indicator | Integrated | Visual confirmation of switching state for safety checks |
Download Phoenix Contact REL-IR4/LDP-24DC/4X21 (2903677) Datasheet
| Commercial Attribute | Details |
|---|---|
| GTIN (EAN/UPC) | 4046356758901 |
| Customs Tariff Number (HS Code) | 85364190 |
| Weight (incl. packing) | 36.1 g |
| Weight (net, excl. packing) | 34.4 g |
| Country of Origin | Poland (PL) |
High-speed packaging systems depend on reliable relay switching to operate conveyor motors and sorting arms. The REL-IR4/LDP-24DC/4X21, with its four changeover contacts, enables multiple circuits to be controlled at once. Its freewheeling diode protects motors from damaging spikes when they stop suddenly, while the LED status display allows quick verification during maintenance. With long mechanical endurance, the relay delivers consistent performance through millions of cycles, ensuring conveyors stay efficient and downtime is minimized.
In robotic work areas, safety light curtains detect movement and stop dangerous equipment instantly. The REL-IR4/LDP-24DC/4X21 provides the fast switching required to cut power to machines when a hazard is detected. Its rapid release time and protective diode shield the circuit from electrical disturbances, while the visible LED confirms activation. This capability allows integrators to create safer work environments without adding complex wiring, making robotic production lines more secure and reliable.
Industrial refrigeration systems rely on precise control of compressors and valves. The REL-IR4/LDP-24DC/4X21 is ideal for energizing solenoid valves, offering reliable operation even under frequent switching. Its compact plug-in design simplifies installation, while the LED provides instant feedback on valve status. The long service life of the relay ensures that refrigeration equipment remains dependable, helping facilities maintain stable cooling performance and avoid costly downtime.
Building automation networks often require isolation between sensitive control electronics and high-power devices such as pumps, fans, or lighting systems. The REL-IR4/LDP-24DC/4X21 handles this task with its strong switching capacity and protective diode that safeguards controllers from voltage surges. Its small footprint saves valuable space in crowded panels, and the integrated LED makes status checks quick and easy. The result is safer, more reliable operation of HVAC and lighting systems across large facilities.
| Category | Model Name | Article No. | Benefits |
|---|---|---|---|
| Relay Base (Push-in) | RIF-2-BPT/4X21 | 2900934 | Fast, tool-free wiring and direct compatibility with REL-IR4 relay |
| Relay Base (Screw) | RIF-2-BSC/4X21 | 2900932 | Secure screw connection for stable and long-term installations |
| End Clamp for DIN Rail | CLIPFIX 35 | 3022276 | Keeps relay bases firmly secured on DIN rail assemblies |
| Replacement Relay (2 CO Contacts) | REL-IR2/LDP-24DC/2X21 | 2903675 | Alternative relay version for applications needing fewer contacts |
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Warranty – 1-year warranty for your peace of mind.
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