Phoenix REL-MR-120AC/21-21 Single Relay
The Phoenix REL-MR-120AC/21-21 Single Relay (Part No: 2961448 ) offers a 120 V ACnominal input voltage UN, 93.6 V AC ... 186 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-120AC/21-21 |
Phoenix REL-MR-120AC/21-21 Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 1x 107 cycles |
| Overvoltage category | III |
| Pollution degree | 3 |
| Service life electrical | see diagram |
| Maximum power dissipation for nominal condition | 0.84 W |
| Test voltage (Winding/contact) | 5 kV AC (50 Hz, 1 min., winding/contact) |
| Nominal input voltage UN | 120 V AC |
| Input voltage range | 93.6 V AC ... 186 V AC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 7 mA (at 50 Hz) |
| Typical response time | 3 ms ... 12 ms (depending on phase relation) |
| 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 | 12 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 |
| Mains frequency | 50/60 Hz |
| Typical release time range | 2 ms ... 9 ms (depending on phase relation) |
| Coil resistance | 8100 Ω ±15 % (at 20 °C) |
| Switching capacity | 2 A (at 24 V, DC13) |
| Motor load according to UL 508 | 1/4 HP, 120 V AC |
The REL-MR-120AC/21-21 by Phoenix Contact (Part No: 2961448) operates at a standard nominal input voltage of 120 V AC and supports a wide input voltage range from 93.6 V AC to 186 V AC, making it reliable even during voltage fluctuations. With a typical input current of 7 mA at 50 Hz, the relay ensures energy-efficient control without compromising signal response. It features 2 changeover contacts with AgNi contact material, engineered to handle switching voltages up to 250 V AC/DC. This provides dependable switching performance across resistive and inductive loads.
Durability is a hallmark of this Single Relay, offering a mechanical service life of 10 million cycles and a rated interrupting capacity of 190 W at 24 V DC. It supports a limiting continuous current of 8 A and can withstand a maximum inrush current of 12 A (20 ms), enabling it to manage higher surge loads during activation. It maintains operational integrity with a minimum switching voltage of 5 V at 10 mA, ensuring stability even with low signal strengths. The RT III degree of protection and compliance with IEC 60664 safety standards further underline its industrial-grade robustness.
Housed in a compact 12.7 mm body and equipped with a plug/solder connection method, the relay fits easily into space-constrained panels and control systems. Its reliable operation across ambient temperatures of -40 °C to +85 °C ensures consistent performance in both hot and cold environments. The REL-MR-120AC/21-21 is trusted by panel builders and system integrators for its blend of precision switching, thermal stability, and long service life. To view more relay options, visit the Phoenix Relay Series or explore the full product line at Phoenix Contact.
Even in harsh environments or temperature-varying conditions, the REL-MR-120AC/21-21 maintains consistent performance, making it a trusted component in material handling systems, energy management panels, and control stations. For engineering students and junior technicians, this model offers a hands-on understanding of relay logic, AC signal switching, and insulation standards. Its compact design, durability, and versatile connectivity make it an essential choice for both OEMs and end-user maintenance teams.
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