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Phoenix REL-MR- 24DC/21AU Single Relay
The Phoenix REL-MR- 24DC/21AU Single Relay (Part No: 2961121 ) offers a 24 V DCnominal input voltage UN, 14.4 V DC ... 66 V DC input voltage range, 250 V AC switching voltage, Plug / solder 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-MR- 24DC/21AU |
Phoenix REL-MR- 24DC/21AU Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 2x 107 cycles |
| Insulation | - |
| Overvoltage category | III |
| Pollution degree | 3 |
| Service life electrical | - |
| Maximum power dissipation for nominal condition | 0.17 W |
| Test voltage (Winding/contact) | 4 kV AC (50 Hz, 1 min., winding/contact) |
| Test voltage (Changeover contact/changeover contact) | - |
| Rated insulation voltage | - |
| Rated surge voltage | - |
| Nominal input voltage UN | 24 V DC |
| Input voltage range | 14.4 V DC ... 66 V DC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 7 mA |
| Typical response time | 2.5 ms |
| Coil voltage | - |
| Status display | - |
| Contact switching type | 1 changeover contact |
| Type of switch contact | Single contact |
| Contact material | AgSnO |
| Maximum switching voltage | 250 V AC |
| Minimum switching voltage | 5 V (at 100 mA) |
| Limiting continuous current | 6 A |
| Maximum inrush current | 50 mA |
| Min. switching current | 10 mA (at 12 V) |
| Interrupting rating (ohmic load) max. | 140 W (at 24 V DC) |
| Connection method | Plug / solder connection |
| Width | 5 mm |
| Height | 28 mm |
| Depth | 15 mm |
| Degree of protection | RT III |
| Degree of protection (Installation location) | - |
| Ambient temperature (operation) | -40 °C ... 85 °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 | 3390 Ω ±10 % (at 20 °C) |
| Switching capacity | 2 A (at 24 V, DC13) |
| Motor load according to UL 508 | - |
| Input power dissipation for UN | - |
| 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-MR-24DC/21AU (Part No: 2961121) is a compact Phoenix AgSnO Material Single Relay built for long-lasting and precise signal control in industrial panels. It operates at a nominal voltage of 24 V DC and supports a wide range from 14.4 V DC to 66 V DC, providing flexibility across various power supply conditions. The relay features a non-polarized, monostable coil with a typical input current of just 7 mA and a fast response time of 2.5 ms, ensuring quick and stable switching performance.
Equipped with AgSnO contacts, this Single Relay achieves excellent conductivity and wear resistance, supporting a continuous current of 6 A and handling voltages up to 250 V AC. It has a high mechanical service life of 20 million cycles, offering reliability for long-term use in repetitive control applications. The device is rated RT III for sealing protection and complies with IEC 60664 standards for electrical safety. Compact in design at just 5 mm width, 28 mm height, and 15 mm depth, it fits easily into dense automation cabinets. With a test voltage of 4 kV AC and maximum power dissipation of 0.17 W, the Phoenix Contact REL-MR-24DC/21AU ensures low heat generation and energy-efficient performance in continuous operation.
The Phoenix Contact REL-MR-24DC/21AU is designed for industrial automation panels, PLC output modules, and process control systems that demand quick and stable relay switching. Maintenance engineers prefer this Single Relay for its fast actuation, compact build, and dependable operation under variable DC inputs. Its wide voltage range and high endurance make it ideal for load switching, signal isolation, and feedback circuits. Operating reliably between -40°C and +85°C, it is suited for control cabinets, HVAC modules, and machinery interlocks. With its efficient coil design and rugged AgSnO contact construction, it ensures consistent switching performance and minimal contact wear even in demanding industrial conditions.
Engineers and procurement teams searching for REL-MR-24DC-21AU-2961121, REL-MR-24DC/21AU, or Phoenix Contact 2961121 can rely on the proven reliability of Phoenix 2961121. This model, also identified as 2961121 Phoenix Contact and 2961121 Phoenix, delivers outstanding control accuracy and thermal endurance in automation systems. Its compact size, durable contact material, and low input current make it ideal for high-density relay banks and modular terminal setups. The Phoenix Contact REL-MR-24DC/21AU continues to be a trusted choice for professionals seeking high-performance relays for 24 V DC automation and signal switching applications.
