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Phoenix REL-MR- 24DC/21-21AU Single Relay
The Phoenix REL-MR- 24DC/21-21AU Single Relay (Part No: 2961215 ) offers a 24 V DCnominal input voltage UN, 15.6 V DC ... 59.52 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- 24DC/21-21AU |
Phoenix REL-MR- 24DC/21-21AU Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 3x 107 cycles |
| Insulation | Basic insulation |
| Overvoltage category | III |
| Pollution degree | 3 |
| Service life electrical | see diagram |
| Maximum power dissipation for nominal condition | 0.41 W |
| Test voltage (Winding/contact) | 5 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 | 15.6 V DC ... 59.52 V DC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 17 mA |
| Typical response time | 3 ms |
| Coil voltage | - |
| Status display | - |
| Contact switching type | 2 changeover contacts |
| Type of switch contact | Single contact |
| Contact material | AgNi |
| Maximum switching voltage | 250 V AC/DC |
| Minimum switching voltage | 5 V (at 10 mA) |
| Limiting continuous current | 8 A |
| Maximum inrush current | 15 A (300 ms) |
| Min. switching current | 10 mA (At 5 V) |
| Interrupting rating (ohmic load) max. | 190 W (at 24 V DC) |
| Connection method | Plug / solder connection |
| Width | 12.7 mm |
| Height | 29 mm |
| Depth | 15.7 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 | 1440 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/21-21AU (Part No: 2961215) is an advanced Multi-layer Gold Contact Single Relay engineered for precise and long-life switching performance. Operating on a nominal input voltage of 24 V DC with a wide input range from 15.6 V DC to 59.52 V DC, it ensures stable operation even under fluctuating supply conditions. This Single Relay supports a continuous current of 8 A and a maximum inrush current of 15 A (300 ms), ensuring consistent performance in heavy-duty control circuits.
Built with AgNi contacts and a mechanical service life of 30 million cycles, the Phoenix Contact REL-MR-24DC/21-21AU meets IEC 60664 standards for insulation safety. Its 5 kV AC test voltage between winding and contact confirms electrical endurance and operational integrity. With only 0.41 W of power dissipation and RT III protection, it delivers energy-efficient reliability across -40 °C to +85 °C. The 12.7 mm width and 15.7 mm depth make it compact and ideal for dense panel layouts. Maintenance teams value its plug or solder connection for quick installation and stable signal control in automation panels and PLC interfaces.
The Phoenix Contact Single Relay REL-MR-24DC/21-21AU is widely used in PLC control systems, signal switching units, and machine safety circuits. Its quick 3 ms response and broad input range make it dependable for automation panels and energy management applications. Engineers prefer this model for its durable contact design, low power dissipation, and consistent switching accuracy. Whether used in HVAC controls, elevator logic circuits, or industrial training modules, this Single Relay ensures precise operation and reduces downtime in long-term industrial use.
Professionals searching for REL-MR-24DC-21-21AU-2961215, REL-MR-24DC/21-21AU, or Phoenix Contact 2961215 can trust the proven engineering standards of Phoenix 2961215. This model, also recognized as 21AU and REL-MR-24DC/21AU, delivers stable electrical performance in industrial control applications. With a coil resistance of 1440 Ω ± 10 % and a switching capacity of 2 A (at 24 V DC13), it meets the demands of engineers seeking high-quality relays for critical automation tasks. The Phoenix Contact REL-MR-24DC/21-21AU continues to be a trusted choice for reliable switching in industrial automation systems worldwide.
