Phoenix REL-IR4/24DC/4X21 Single Relay
The Phoenix REL-IR4/24DC/4X21 Single Relay (Part No: 2907054 ) offers a 24 V DCnominal input voltage UN, 18.7 V DC ... 46.8 V DC (20 °C) input voltage range, 250 V AC/DC switching voltage, Plug-in connection method. Manufactured by Phoenix under the Phoenix Single Relay category, this model belongs to the Phoenix REL Series.
| Brand | Phoenix Contact |
| Product Type | Single Relay |
| Model Number | REL-IR4/24DC/4X21 |
Phoenix REL-IR4/24DC/4X21 Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 1x 107 cycles, approximately |
| Insulation | Basic insulation |
| Overvoltage category | II |
| Pollution degree | 2 |
| Service life electrical | - |
| Maximum power dissipation for nominal condition | 0.91 W |
| Test voltage (Winding/contact) | 2.5 kVrms (50 Hz, 1 min., winding/contact) |
| Test voltage (Changeover contact/changeover contact) | 2.5 kVrms (50 Hz, 1 min., changeover contact/changeover contact) |
| Rated insulation voltage | 250 V AC |
| Rated surge voltage | 2.5 kV |
| Nominal input voltage UN | 24 V DC |
| Input voltage range | 18.7 V DC ... 46.8 V DC (20 °C) |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 38 mA |
| Typical response time | 13 ms |
| Typical release time | 3 ms |
| Contact switching type | 4 changeover contacts |
| Type of switch contact | Single contact |
| Contact material | AgNi |
| Maximum switching voltage | 250 V AC/DC |
| Minimum switching voltage | 5 V (At 24 mA) |
| Limiting continuous current | 6 A |
| Maximum inrush current | 16 A (20 ms, N/O contacts) |
| Min. switching current | 5 mA (at 24 V) |
| Interrupting rating (ohmic load) max. | 144 W (at 24 V DC) |
| Connection method | Plug-in connection |
| Width | 21.2 mm |
| Height | 27.5 mm |
| Depth | 35.6 mm |
| Degree of protection | RT I |
| Ambient temperature (operation) | -40 °C ... 70 °C |
| Ambient temperature (storage/transport) | -40 °C ... 85 °C |
| Standards/regulations | IEC 60664 |
| Mounting position | any |
| Switching capacity | 2 A (at 24 V, DC13) |
The Phoenix Contact REL-IR4/24DC/4X21 (Part No: 2907054) is a monostable 5 mA Switching Current Single Relay designed for robust switching operations in automation and control systems. It operates on a nominal input voltage of 24 V DC, supporting an input range from 18.7 V DC to 46.8 V DC, with a typical input current of 38 mA. This Single Relay features 4 changeover contacts using AgNi contact material, ensuring consistent conductivity and arc suppression across inductive and resistive loads.
Built for long-term use, the REL-IR4/24DC/4X21 offers a mechanical service life of approximately 10 million cycles. It supports a maximum switching voltage of 250 V AC/DC and a minimum switching threshold of just 5 mA at 24 V, making it ideal for low-current signal-level switching. With a limiting continuous current of 6 A and a maximum inrush current of 16 A (20 ms), this model maintains high reliability under fluctuating load conditions. Its interrupting capacity reaches 144 W at 24 V DC, providing robust performance even in compact or space-constrained panels. Compliant with IEC 60664 and protected by RT I environmental sealing, it operates efficiently between -40 °C and +70 °C.
The Phoenix Contact REL-IR4/24DC/4X21 (Part No: 2907054) is widely used in PLC-controlled switching, machine safety modules, and automation relay blocks where low-signal actuation and high contact reliability are essential. Maintenance teams appreciate its easy plug-in connection for rapid replacement, while OEMs value the relay’s compact size and excellent thermal performance. For junior engineers and students, it offers real-world insights into industrial-grade electromechanical switching and coil actuation design. The more Phoenix Relays or visit the Phoenix Contact brand page for additional models and support.
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