Maintenance teams planning replacements for REL-OR3-LDP-24DC-3X21 frequently review Phoenix SMPS, Phoenixcontact Rel Ir Bl L 230Ac 4X21 and Phoenixcontact Phoenix Contact Industrial Ethernet Switches to prevent downtime, checking availability and compatibility with existing systems.
Phoenix REL-OR3/LDP-24DC/3X21 Single Relay
The Phoenix REL-OR3/LDP-24DC/3X21 Single Relay (Part No: 2903693 ) offers a 24 V DCnominal input voltage UN, 20.4 V DC ... 26.4 V DC (20 °C) input voltage range, 250 V 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-OR3/LDP-24DC/3X21 |
Phoenix REL-OR3/LDP-24DC/3X21 Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | approx. 2x 107 cycles |
| Insulation | Basic insulation |
| Overvoltage category | III |
| Pollution degree | 3 |
| Service life electrical | - |
| Maximum power dissipation for nominal condition | 1.44 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 | 4 kV |
| Nominal input voltage UN | 24 V DC |
| Input voltage range | 20.4 V DC ... 26.4 V DC (20 °C) |
| Drive and function | monostable |
| Drive (polarity) | polarized |
| Typical input current at UN | 60 mA |
| Typical response time | 20 ms |
| Coil voltage | - |
| Status display | LED (yellow) |
| Contact switching type | 3 changeover contacts |
| Type of switch contact | Single contact |
| Contact material | AgNi |
| Maximum switching voltage | 250 V DC |
| Minimum switching voltage | 10 V (At 24 mA) |
| Limiting continuous current | 10 A |
| Maximum inrush current | 30 A (20 ms, N/O contacts) |
| Min. switching current | 10 mA (at 24 V) |
| Interrupting rating (ohmic load) max. | 240 W (at 24 V DC) |
| Connection method | Plug-in connection |
| Width | 35 mm |
| Height | 35 mm |
| Depth | 54.4 mm |
| Degree of protection | RT I |
| Degree of protection (Installation location) | ≥ IP54 (Installation location) |
| Ambient temperature (operation) | -40 °C ... 70 °C |
| Ambient temperature (storage/transport) | -40 °C ... 85 °C |
| Standards/regulations | IEC 60664 |
| Mounting type | - |
| Mounting position | any |
| Mains frequency | - |
| Typical release time range | - |
| Coil resistance | 430 Ω ±10 % |
| Switching capacity | - |
| Motor load according to UL 508 | 1/2 HP, 240 V AC (N/O contact) |
| Input power dissipation for UN | 1.44 W |
| 3-phase motor load | - |
| Product family | - |
| Relay type | - |
| Test voltage () | - |
| Degree of protection (Relay) | - |
| Inrush current, minimum | - |
| Non-operate voltage | - |
| Safe operate voltage | - |
| Test voltage (N/O contact / N/O contact) | - |
The Phoenix Contact REL-OR3/LDP-24DC/3X21 (Part No: 2903693) is engineered for consistent operation in tough industrial conditions, running on a nominal input voltage of 24 V DC with a broad input voltage range from 20.4 V DC to 26.4 V DC. It ensures quick responsiveness with a typical input current of 60 mA and a response time of 20 ms, ensuring compatibility with fast-paced signal changes. The 1.44 W power dissipation at nominal voltage ensures efficient energy handling without overheating, supporting round-the-clock operation in control cabinets.
This Single Relay provides 3 changeover contacts made of AgNi contact material, capable of switching up to 250 V DC. It can handle a limiting continuous current of 10 A and an impressive maximum inrush current of 30 A (20 ms, N/O contacts), making it suitable for both resistive and inductive loads. The relay offers a minimum switching voltage of 10 V at 24 mA and a minimum switching current of 10 mA, which supports reliable low-level signal switching.
Built for durability, the REL-OR3/LDP-24DC/3X21 boasts a mechanical service life of approximately 20 million cycles and complies with IEC 60664. It includes basic insulation, a yellow LED status display, and RT I protection. The plug-in connection simplifies installation and replacement in field cabinets. Its performance is guaranteed across wide temperature ranges, operating reliably from -40 °C to +70 °C. These features make it a trusted relay module in automation panels where uptime, stability, and component longevity are critical. You can find more information on the Phoenix Relay product page or browse all offerings at the Phoenix Contact brand portal.
