Maintenance teams planning replacements for REL-MR-12DC-21AU frequently review SMPS Phoenix, 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-MR- 12DC/21AU Single Relay
The Phoenix REL-MR- 12DC/21AU Single Relay (Part No: 2961163 ) offers a 12 V DCnominal input voltage UN, 7.2 V DC ... 33 V DC input voltage range, 250 V AC/DC 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- 12DC/21AU |
Phoenix REL-MR- 12DC/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 | 12 V DC |
| Input voltage range | 7.2 V DC ... 33 V DC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 14 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/DC |
| 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 | 848 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) | - |
Engineered by Phoenix Contact, the REL-MR-12DC/21AU (Part No: 2961163) operates at a nominal input voltage of 12 V DC and supports a wide input range from 7.2 V DC to 33 V DC, ensuring stable performance even in fluctuating power environments. With a typical input current of just 14 mA, it efficiently conserves energy without compromising operational precision. The relay features 1 changeover contact with AgSnO contact material, capable of switching up to 250 V AC/DC, delivering dependable performance across both control and power signal paths.
This Single Relay supports a minimum switching voltage of 5 V at 100 mA and can handle a limiting continuous current of 6 A, making it suitable for both low and medium-load conditions. With a maximum interrupting capacity of 140 W at 24 V DC and maximum inrush current of 50 mA, it handles resistive and inductive loads reliably in typical automation workflows. The typical response time of 2.5 ms makes it ideal for time-sensitive switching tasks in logic circuits and safety controls.
Durability is guaranteed with a mechanical service life of 20 million cycles. The compact 5 mm width and plug/solder connection make installation fast and space-efficient inside tight control panels. Its RT III protection rating ensures resistance to humidity and contamination, and full operational range from -40 °C to +85 °C supports deployment in demanding industrial conditions. Conforming to IEC 60664 standards, the REL-MR-12DC/21AU stands out for its quality, reliability, and trust among automation engineers. To more models in this series, visit the Phoenix Relay Collection or explore brand-wide innovations on the Phoenix Contact page.
Its compact size and wide operating temperature range make it a practical choice for both indoor and field-mounted enclosures. For engineering students and junior technicians, this model provides a reliable example of compact relay design, proper insulation, and DC signal integrity in real-world applications. Whether used in OEM design or retrofit upgrades, the REL-MR-12DC/21AU adds precision, durability, and peace of mind to any automation setup.
