Phoenix RIF-4-BSC/3X21 Relay Socket
The Phoenix RIF-4-BSC/3X21 Relay Socket (Part No: 2900960 ) offers a Screw connection method, 0.5 mm² ... 4 mm² conductor cross section rigid, 0.5 mm² ... 4 mm² conductor cross section flexible, DIN rail mounting mounting type. Manufactured by Phoenix under the Phoenix Relay Socket category, this model belongs to the Phoenix PLC Series.
| Brand | Phoenix Contact |
| Product Type | Relay Socket |
| Model Number | RIF-4-BSC/3X21 |
Phoenix RIF-4-BSC/3X21 Relay Socket – Technical Specifications
| Specification | Value |
|---|---|
| Product type | Relay socket |
| Product family | RIFLINE complete |
| Nominal voltage UN | 440 V AC |
| Nominal current IN | max. 13 A (Depends on application/assembly) |
| Connection method | Screw connection |
| Stripping length | 8 mm |
| Conductor cross section rigid | 0.5 mm² ... 4 mm² |
| Conductor cross section flexible | 0.5 mm² ... 4 mm² |
| Width | 44 mm |
| Height | 96 mm |
| Depth Retaining bracket | 91 mm (with retaining bracket) |
| Color | gray (RAL 7042) |
| Ambient temperature (operation) | -40 °C ... 85 °C (Depends on application/assembly) |
| Ambient temperature (storage/transport) | -40 °C ... 85 °C |
| Mounting type | DIN rail mounting |
| Mounting position | any |
| Protective circuit | depending on the selected input/suppressor modules |
| Conductor cross section AWG | 20 ... 10 (solid) |
| Tightening torque | 0.5 Nm ... 0.6 Nm |
| Flammability rating according to UL 94 | V2 (Housing) |
The Phoenix RIF-4-BSC/3X21 is engineered as part of the RIFLINE complete family, optimized for high-reliability relay integration in industrial control panels. This Relay Socket is capable of supporting up to 440 V AC nominal voltage and a maximum current of 13 A, depending on the relay assembly used. Built with a durable screw connection system, it accepts rigid and flexible conductor cross-sections ranging from 0.5 mm² to 4 mm² or AWG 20 to 10. With a stripping length of 8 mm and tightening torque of 0.5–0.6 Nm, the terminals offer secure mechanical retention and conductivity. The socket’s compact dimensions—44 mm wide and 96 mm high—combined with a depth of 91 mm (with retaining bracket), make it suitable for space-constrained DIN rail enclosures. The gray UL 94 V2 flame-retardant housing is tested for extended durability, and the operating temperature range of -40 °C to +85 °C ensures dependable performance in both hot and cold industrial environments. Suppressor module compatibility allows users to select custom input protection based on their relay configuration, making this socket adaptable across multiple use cases.
The RIF-4-BSC/3X21 is ideal for use in power distribution systems, machinery automation circuits, and industrial switching networks that require 3 normally open (3 N/O) relay contacts. It’s commonly used by engineers for isolating control logic from high-voltage power lines and switching heavy inductive loads like motors and solenoids. Panel builders and OEM integrators benefit from the socket’s flexibility, rugged construction, and ease of integration with Phoenix Contact’s relay modules. Maintenance engineers appreciate its straightforward screw terminal layout and fast replacement design, which minimizes downtime during scheduled servicing. For engineering students and trainees, it serves as a standard example of high-load DIN rail relay base design, commonly encountered in real-world industrial panels. This socket supports any mounting orientation and is trusted for both new project builds and retrofit upgrades where space, safety, and current rating are critical considerations.
To explore more high-quality relay bases, visit the Phoenix Relay Socket catalog. For more about the manufacturer and product series, check the Phoenix Contact brand page on IndMALL.
