Phoenix REL-SR- 24DC/2X21/FG Single Relay
The Phoenix REL-SR- 24DC/2X21/FG Single Relay (Part No: 2908777 ) offers a 24 V DCnominal input voltage UN, 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-SR- 24DC/2X21/FG |
Phoenix REL-SR- 24DC/2X21/FG Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | approx. 107 cycles |
| Insulation | Safe isolation, reinforced insulation |
| Overvoltage category | III |
| Pollution degree | 2 |
| Maximum power dissipation for nominal condition | 0.7 W |
| Rated insulation voltage | 250 V AC |
| Rated surge voltage | 6 kV |
| Nominal input voltage UN | 24 V DC |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 29 mA |
| Typical response time | 10 ms |
| Typical release time | 4 ms |
| Contact switching type | 2 changeover contacts, forcibly actuated |
| Type of switch contact | Single contact |
| Contact material | AgNi |
| Maximum switching voltage | 250 V AC/DC |
| Minimum switching voltage | 15 V |
| Limiting continuous current | 6 A |
| Maximum inrush current | 6 A |
| Min. switching current | 10 mA (5 V) |
| Interrupting rating (ohmic load) max. | 144 W (24 V DC) |
| Connection method | Plug / solder connection |
| Width | 12.6 mm |
| Height | 29 mm |
| Depth | 25.5 mm |
| Degree of protection | IP20 |
| Ambient temperature (operation) | -25 °C ... 70 °C |
| Ambient temperature (storage/transport) | -25 °C ... 70 °C |
| Standards/regulations | DIN EN 50178 |
| Switching capacity | 2 A (24 V (DC13)) |
| Motor load according to UL 508 | 10 LRA / 0,5 FLA |
Built to meet rigorous standards, the Phoenix Contact REL-SR-24DC/2X21/FG (Part No: 2908777) is a monostable Safety Relay designed for safe and reliable operation in 24 V DC control circuits. Its nominal coil voltage is 24 V DC, with a typical input current of 29 mA, supporting efficient energy usage in continuous operations. The relay features 2 forcibly actuated changeover contacts, a requirement in many safety applications to ensure mechanical interlocking of contact positions. With AgNi contact material, it provides stable switching performance for both resistive and inductive loads.
This force-guided relay handles a maximum switching voltage of 250 V AC/DC and a limiting continuous current of 6 A, enabling it to switch both signal and power lines in control circuits. Its minimum switching voltage is 15 V with a minimum current of 10 mA, making it suitable even for low-level signal paths. The device offers a rapid response time of 4 ms and a rated interrupting capacity of 144 W at 24 V DC, ensuring dependable performance in dynamic load conditions. The relay ensures reinforced insulation with a 6 kV surge voltage rating, conforming to DINE EN 50178 and Overvoltage Category III for high-reliability environments.
This model is built for rugged environments with a protection rating of IP20 and operational temperature range of -25 °C to +70 °C. Its compact body (only 12.6 mm wide) and plug/solder connection method support dense installations in narrow control cabinets. With a mechanical service life of approximately 10 million cycles, the REL-SR-24DC/2X21/FG delivers long-term performance in mission-critical applications. To browse more Phoenix Contact relays, visit the official Phoenix Contact brand page or view all available models in the Phoenix Relay category.
Its fast switching response and robust thermal stability make it dependable for controlling actuators, relays, and outputs in complex safety hierarchies. For educational institutions and engineering students, this relay is an excellent component to demonstrate advanced safety logic and the mechanical principles behind positive-guided switching. Whether used in OEM safety modules or third-party safety relay chains, the REL-SR-24DC/2X21/FG upholds trust, compliance, and protection across mission-critical control systems.
Related Products
