Phoenix REL-IR4/LDP- 12DC/4X21 Single Relay
The Phoenix REL-IR4/LDP- 12DC/4X21 Single Relay (Part No: 2903676 ) offers a 12 V DCnominal input voltage UN, 9.6 V DC ... 21.6 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/LDP- 12DC/4X21 |
Phoenix REL-IR4/LDP- 12DC/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 | 0.94 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 | 12 V DC |
| Input voltage range | 9.6 V DC ... 21.6 V DC (20 °C) |
| Drive and function | monostable |
| Drive (polarity) | polarized |
| Typical input current at UN | 78 mA |
| Typical response time | 13 ms |
| Typical release time | 14 ms |
| 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 ... 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) |
| Motor load according to UL 508 | 1/3 HP, 240 V AC |
Built by Phoenix Contact, the REL-IR4/LDP-12DC/4X21 (Part No: 2903676) is a high-performance Coil Voltage 12 V Single Relay engineered for precise switching in critical industrial applications. This model operates at a nominal input voltage of 12 V DC, with a safe and efficient input range of 9.6 V to 21.6 V DC, making it resilient to typical voltage fluctuations. It supports 4 changeover contacts with AgNi contact material, and offers a maximum switching voltage of 250 V AC/DC, along with a minimum switching current of 5 mA at 24 V. The relay ensures dependable operation with a mechanical service life of approximately 20 million cycles and can handle a maximum inrush current of 16 A (20 ms) while maintaining a limiting continuous current of 6 A.
Featuring basic insulation and a test voltage of 2.5 kVrms between winding and contact, this relay complies with IEC 60664 standards and provides safe isolation in automation environments. It includes a clear LED status indicator and supports a quick plug-in connection for easy panel integration. With a power dissipation of only 0.94 W under nominal conditions and an ambient operating temperature range of -40°C to +70°C, this relay is built to perform reliably in harsh industrial setups. For more such trusted models, visit the Phoenix Relay catalog or explore the full Phoenix Contact brand range.
The Phoenix REL-IR4/LDP-12DC/4X21 is ideal for automation tasks like PLC signal switching, relay interface modules, machine diagnostics circuits, and control panel protection. Engineers and maintenance teams trust this model for its precise response time of 14 ms and low input current of 78 mA. Thanks to its small footprint (21.2 mm width), it fits perfectly in dense control cabinets, and the RT I protection rating ensures long-term durability even in tough industrial conditions. Engineering students and junior technicians can also benefit from learning about how this relay's combination of DC switching capability and mechanical endurance plays a crucial role in industrial control logic. This 12 V DC Single Relay strikes the right balance between performance, safety, and space efficiency.
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