Many engineers reviewing Phoenixcontact REL-MR-24AC-21HC also explore SMPS Phoenix, Phoenixcontact Rel Ir Bl L 230Ac 4X21 and Phoenix Contact Relay Socket, ensuring they donโt miss strong alternatives before finalizing procurement decisions.
Phoenix REL-MR- 24AC/21HC Single Relay
The Phoenix REL-MR- 24AC/21HC Single Relay (Part No: 2961406 ) offers a 24 V ACnominal input voltage UN, 18.72 V AC ... 37.2 V AC 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- 24AC/21HC |
Phoenix REL-MR- 24AC/21HC Single Relay โ Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 1x 107 cycles |
| Insulation | - |
| Overvoltage category | III |
| Pollution degree | 3 |
| Service life electrical | see diagram |
| Maximum power dissipation for nominal condition | 0.77 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 AC |
| Input voltage range | 18.72 V AC ... 37.2 V AC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 32 mA (50 Hz) |
| Typical response time | - |
| Coil voltage | - |
| Status display | - |
| Contact switching type | 1 changeover contact |
| Type of switch contact | Single contact |
| Contact material | AgNi |
| Maximum switching voltage | 250 V AC/DC |
| Minimum switching voltage | 12 V (at 10 mA) |
| Limiting continuous current | 16 A |
| Maximum inrush current | 25 A (20 ms) |
| Min. switching current | 10 mA (at 12 V) |
| Interrupting rating (ohmic load) max. | 384 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 II |
| Degree of protection (Installation location) | - |
| Ambient temperature (operation) | -40 ยฐC ... 85 ยฐC |
| Ambient temperature (storage/transport) | -40 ยฐC ... 85 ยฐC |
| Standards/regulations | IEC 60664 |
| Mounting type | - |
| Mounting position | any |
| Mains frequency | 50/60 Hz |
| Typical release time range | 2 ms ... 9 ms (depending on phase relation) |
| Coil resistance | 350 ฮฉ ยฑ10 % (at 20 ยฐC) |
| Switching capacity | 2 A (at 24 V, DC13) |
| Motor load according to UL 508 | 1/2 HP, 120 V AC (N/O contact) |
| 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-24AC/21HC operates within a voltage range of 18.72 V AC to 37.2 V AC, with a nominal input voltage of 24 V AC and input current of 32 mA at 50 Hz. It features a monostable drive, non-polarized coil, and a single AgNi changeover contact rated for up to 250 V AC/DC. Designed to handle continuous currents up to 16 A and inrush currents of 25 A (20 ms), this Single Relay meets demanding load requirements. The minimum switching voltage is 12 V at 10 mA, while the interrupting capacity reaches 384 W at 24 V DC. With a mechanical lifespan of 10 million cycles and environmental resilience from -40โฏยฐC to +85โฏยฐC, itโs engineered for long-term performance. A compact body (12.7 mm width) and plug/solder connection method allow easy integration into space-limited control systems. Certified per IEC 60664 with RT II protection, it delivers both electrical safety and operational consistency.
Related Phoenix Contact relay models can be found in the Phoenix Relay section. For other automation components from the same brand, refer to the Phoenix Contact category.
The REL-MR-24AC/21HC is often selected for use in machine control cabinets, HVAC panels, and PLC-controlled switching circuits where stable performance under 24 V AC control signals is required. Its robust mechanical life and contact design ensure fewer replacements in environments with frequent operations.
