During technical comparisons, REL-MR-24DC-21HC-MS appears alongside SMPS Phoenix, Phoenixcontact Rel Ir Bl L 230Ac 4X21 and Phoenixcontact Phoenix Contact Industrial Ethernet Switches so engineers assess signal types, ingress protection, and ambient tolerances accurately.
Phoenix REL-MR- 24DC/21HC/MS Single Relay
The Phoenix REL-MR- 24DC/21HC/MS Single Relay (Part No: 2987888 ) offers a 24 V DCnominal input voltage UN, 19.2 V DC ... 52.8 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/21HC/MS |
Phoenix REL-MR- 24DC/21HC/MS Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 5x 106 cycles |
| Insulation | - |
| Overvoltage category | - |
| Pollution degree | - |
| Service life electrical | see diagram |
| Maximum power dissipation for nominal condition | 0.43 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 | 19.2 V DC ... 52.8 V DC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 18 mA |
| Typical response time | 6 ms |
| 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 | 32 A (20 ms) |
| Min. switching current | 10 mA (at 12 V) |
| Interrupting rating (ohmic load) max. | 4000 VA (for 250 V AC) |
| Connection method | Plug / solder connection |
| Width | 12.7 mm |
| Height | 29 mm |
| Depth | 25 mm |
| Degree of protection | - |
| Degree of protection (Installation location) | - |
| Ambient temperature (operation) | -40 °C ... 70 °C |
| Ambient temperature (storage/transport) | -40 °C ... 85 °C |
| Standards/regulations | EN 61810-1 |
| Mounting type | - |
| Mounting position | - |
| Mains frequency | - |
| Typical release time range | - |
| Coil resistance | - |
| 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-24DC/21HC/MS (Part No: 2987888) is a robust Plug/Solder Connection Single Relay designed to operate within a wide input voltage range of 19.2 V DC to 52.8 V DC. Built with AgNi contact material and a single changeover contact, this relay switches up to 250 V AC/DC and performs with high reliability in control systems that demand both fast response and durability.
With a compact width of just 12.7 mm and plug/solder connection terminals, the REL-MR-24DC/21HC/MS offers easy integration into tight industrial control cabinets. Its ability to handle inrush currents up to 32 A (20 ms) adds to its reliability in dynamic switching applications. Designed in accordance with EN 61810-1 standards and tested to withstand harsh environments, this relay is widely used by control engineers, panel builders, and machine manufacturers.
Maintenance engineers choose the REL-MR-24DC/21HC/MS for panel upgrades and replacements where fast relay response and reliable switching are critical. For engineering students and automation trainees, this model provides a practical reference for understanding how relays operate in real-world industrial circuits—especially for learning signal isolation, switching logic, and load control fundamentals.
The Phoenix Contact REL-MR- 24DC/21HC/MS (Part No: 2987888) meets the needs of engineers looking for consistent switching performance, low maintenance, and trusted brand reliability in control panels, process automation, and signal transmission systems. Product documentation and variant options are available through the Phoenix Relay section and Phoenix Contact brand page.
