Phoenix REL-IR-BL- 24DC/4X21 Single Relay
The Phoenix REL-IR-BL- 24DC/4X21 Single Relay (Part No: 1032521 ) offers a 24 V DCnominal input voltage UN, 19.2 V DC ... 46.8 V DC (20 °C) input voltage range, 250 V AC/DC switching voltage, Plug-in 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-IR-BL- 24DC/4X21 |
Phoenix REL-IR-BL- 24DC/4X21 Single Relay – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Single relay |
| Mechanical service life | 3x 107 cycles |
| Insulation | Basic insulation |
| Overvoltage category | III |
| Pollution degree | 2 |
| Service life electrical | see diagram |
| Maximum power dissipation for nominal condition | 741 mW |
| Test voltage (Winding/contact) | 2.5 kVrms (50 Hz, 1 min., winding/contact) |
| Test voltage (Changeover contact/changeover contact) | 2 kVrms (50 Hz, 1 min., changeover contact/changeover contact) |
| Rated insulation voltage | 250 V AC |
| Rated surge voltage | 5 kV |
| Nominal input voltage UN | 24 V DC |
| Input voltage range | 19.2 V DC ... 46.8 V DC (20 °C) |
| Drive and function | monostable |
| Drive (polarity) | non-polarized |
| Typical input current at UN | 31 mA |
| Typical response time | 15 ms |
| Typical release time | 10 ms |
| Coil voltage | 24 V DC |
| Contact switching type | 4 changeover contacts |
| Type of switch contact | Single contact |
| Contact material | AgNi |
| Maximum switching voltage | 250 V AC/DC |
| Minimum switching voltage | 12 V (10 mA) |
| Limiting continuous current | 6 A |
| Maximum inrush current | 12 A (20 ms, N/O contacts) |
| Min. switching current | 10 mA (12 V) |
| Interrupting rating (ohmic load) max. | 144 W (24 V DC) |
| Connection method | Plug-in connection |
| Degree of protection | RT II |
| Degree of protection (Installation location) | ≥ IP54 (Installation location) |
| Ambient temperature (operation) | -40 °C ... 70 °C |
| Ambient temperature (storage/transport) | -40 °C ... 70 °C |
| Standards/regulations | EN 61810-1 |
| Mounting type | Plug-in mounting |
| Mounting position | any |
The Phoenix Contact REL-IR-BL-24DC/4X21 (Part No: 1032521) is a high-performance Power Contacts Single Relay designed for long-life switching operations in DC control systems. Operating at a nominal input voltage of 24 V DC, it supports a wide input range of 19.2 V DC to 46.8 V DC with a typical input current of 31 mA. The relay offers a mechanical service life of 30 million cycles, backed by a rugged AgNi contact material and a robust 4 changeover contact configuration.
This Single Relay handles a maximum switching voltage of 250 V AC/DC and supports a limiting continuous current of 6 A, making it suitable for both signal and low-power load switching. It also withstands a maximum inrush current of 12 A (20 ms) and has an interrupting capacity of 144 W at 24 V DC for ohmic loads. Built to RT II protection standards and compliant with EN 61810-1, this relay performs reliably from -40°C to +70°C. To explore more, visit the Phoenix Relay collection or view the full Phoenix Contact brand page.
Its plug-in mounting and non-polarized coil make it easy to install or replace, even in tight spaces. Technicians benefit from its arc-resistant design and high inrush current capacity, making it suitable for controlling both inductive and resistive loads. The compact build also supports integration into modular relay racks, helping OEMs reduce panel size without compromising reliability.
This relay is also a great training model for engineering students learning industrial switching principles, coil operation, and load compatibility. With robust standards compliance and proven field reliability, the REL-IR-BL-24DC/4X21 stands out as a trusted solution for energy-efficient, high-cycle switching tasks in both legacy and modern automation setups.
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