Phoenix REL-MR- 12DC/21-21 Single Relay
The Phoenix REL-MR- 12DC/21-21 Single Relay (Part No: 2961257 ) offers a 12 V DCnominal input voltage UN, 7.8 V DC ... 29.76 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/21-21 |
Phoenix REL-MR- 12DC/21-21 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 | 0.4 W |
| Test voltage (Winding/contact) | 5 kV AC (50 Hz, 1 min., winding/contact) |
| Nominal input voltage UN | 12 V DC |
| Input voltage range | 7.8 V DC ... 29.76 V DC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 33 mA |
| Typical response time | 7 ms |
| Typical release time | 3 ms |
| 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 | 25 A (20 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 |
| Ambient temperature (operation) | -40 °C ... 85 °C |
| Ambient temperature (storage/transport) | -40 °C ... 85 °C |
| Standards/regulations | IEC 60664 |
| Mounting position | any |
| Coil resistance | 360 Ω ±10 % (at 20 °C) |
| Switching capacity | 2 A (at 24 V, DC13) |
| Motor load according to UL 508 | 1/4 HP, 120 V AC |
The Phoenix Contact REL-MR-12DC/21-21 (Part No: 2961257) is a compact Phoenix Input Voltage 12 V DC Single Relay that delivers fast, efficient, and stable switching for control applications. It operates at a nominal voltage of 12 V DC and supports an input range from 7.8 V DC to 29.76 V DC, offering wide compatibility in variable voltage environments. With a typical input current of 33 mA and an ultra-fast response time of 3 ms, it enables responsive control for modern automation logic systems.
This Single Relay from Phoenix Contact uses a non-polarized monostable coil design and incorporates two changeover contacts with AgNi material for dependable conductivity and extended service life. It handles switching voltages up to 250 V AC/DC and supports a continuous current of 8 A, making it suitable for both resistive and inductive loads. Its mechanical service life exceeds 30 million cycles, while electrical insulation between winding and contact is rated at 5 kV AC, ensuring operator safety and compliance with IEC 60664 standards. The relay dissipates only 0.4 W under nominal conditions, optimizing energy efficiency and thermal stability. Compact in size (12.7 mm × 29 mm × 15.7 mm) and designed for plug or solder connections, the Phoenix Contact REL-MR-12DC/21-21 provides easy integration in control panels and PLC cabinets.
The Phoenix Contact REL-MR-12DC/21-21 is commonly used in automation cabinets, control panels, and power management modules requiring precise signal switching at low voltage levels. Engineers and maintenance teams choose this Single Relay for its long service life, high insulation reliability, and robust performance across -40°C to +85°C. It performs consistently in PLC I/O circuits, alarm interfaces, motor logic, and relay-based interlocking systems. The compact structure, low heat dissipation, and stable coil response make it ideal for installations in energy-sensitive or space-constrained control cabinets. Trusted by electrical engineers and panel integrators, the Phoenix Contact 12 V DC Relay ensures efficiency and dependability in both OEM and retrofit automation environments.
Professionals searching for REL-MR-12DC-21-21-2961257, 2961257, or Phoenix MR relay solutions often prefer the reliable performance of Phoenix 21 technology. The REL Relay series, including Phoenix Contact 2961257, is designed to deliver stable control at 12DC input, ensuring high switching precision under variable loads. Built on the trusted engineering of Phoenix 2900 series relays, the Phoenix Contact REL-MR-12DC/21-21 offers compact design, robust insulation, and rapid response, making it one of the most dependable relays for control and automation professionals seeking long-lasting 12 V DC relay performance.
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