Phoenix REL-IR4/L- 24AC/4X21 Single Relay
The Phoenix REL-IR4/L- 24AC/4X21 Single Relay (Part No: 2903686 ) offers a 24 V ACnominal input voltage UN, 18.7 V AC ... 33.1 V AC (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/L- 24AC/4X21 |
Phoenix REL-IR4/L- 24AC/4X21 Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | approx. 2x 107 cycles |
| Insulation | Basic insulation |
| Overvoltage category | II |
| Pollution degree | 2 |
| Service life electrical | see diagram |
| Maximum power dissipation for nominal condition | 1.58 W |
| Test voltage (Winding/contact) | 2.5 kVrms (50 Hz, 1 min., winding/contact) |
| Test voltage (Changeover contact/changeover contact) | 2 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 AC |
| Input voltage range | 18.7 V AC ... 33.1 V AC (20 °C) |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 66 mA |
| Typical response time | 5 ms ... 15 ms (depending on phase relation) |
| Status display | LED (yellow) |
| 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 ... 55 °C |
| Ambient temperature (storage/transport) | -40 °C ... 85 °C |
| Standards/regulations | IEC 60664 |
| Mounting position | any |
| Mains frequency | 50/60 Hz |
| Typical release time range | 5 ms ... 20 ms (depending on phase relation) |
| Coil resistance | - |
| Switching capacity | 2 A (at 24 V, DC13) |
| Motor load according to UL 508 | 1/3 HP, 240 V AC |
The Phoenix Contact REL-IR4/L-24AC/4X21 (Part No. 2903686) is a high-precision 144 mW Maximum Power Single Relay tailored for AC control circuits operating at 24 V AC. Built for long-term performance, it features a mechanical service life of approx. 2×10⁷ cycles, making it ideal for repetitive switching in process and factory automation.
This Single Relay supports a maximum switching voltage of 250 V AC/DC and delivers consistent results even under demanding load conditions. With a typical input current of 66 mA and a maximum interrupting rating of 144 W at 24 V DC, it provides reliable switching performance. The RT I protection rating and ambient operation range of -40°C to +55°C ensure stability in harsh environments. Equipped with 4 changeover contacts and AgNi contact material, this relay meets the insulation and electrical standards outlined in IEC 60664, trusted by engineers globally.
For engineering students, automation technicians, and electrical designers, the REL-IR4/L-24AC/4X21 offers a real-world example of precision relay engineering—providing practical insights into safe signal switching and power relay design. Built by Phoenix Contact, this Single Relay combines German engineering with industrial-grade resilience to meet the demands of modern automation.
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