Summary

• 26-pack of Phoenix Contact PLC-BSC-24DC/21 (2966016) DIN rail relay interface modules with 24V DC control inputs, screw terminal connections, and replaceable plug-in relays for industrial automation and control applications.
• The package contains 26 PLC-INTERFACE relay bases, including 25 bases equipped with Phoenix Contact REL-MR-24DC/21AU (2961121) electromechanical relays and 1 base equipped with a Phoenix Contact OPT-24DC/48DC/100 (2966618) solid-state relay.
• Each relay base features a compact 6.2mm housing, 35mm DIN rail mounting compatibility, integrated LED indication, and a protective input circuit. The electromechanical relays feature gold-plated SPDT changeover contacts, while the solid-state relay provides a normally open electronic output for low-current DC switching.
• *Two unidentified, custom-cut plug-in bridges are also supplied as complimentary spare accessories. These originally accompanied the equipment and are not included in the listing price.*
• Listing is for 26 Phoenix Contact PLC-BSC-24DC/21 relay bases with the 26 installed relays described above, plus 2 complimentary plug-in bridges only, does not include any instructions, installation screws, or original box. Please review all photos for the exact item, condition, and components included.
• This item was sourced from a new, uncommissioned equipment cabinet that was dismantled prior to being placed into service.

Product Description

• The Phoenix Contact PLC-BSC-24DC/21 is a compact relay interface base from the PLC-INTERFACE series, designed for use in industrial control systems, automation equipment, programmable logic controller interfaces, and electrical control cabinets.
• Each base features screw terminal connections, an integrated protective circuit, and a slim 6.2mm design that helps conserve DIN rail space. Compatible plug-in relays can be replaced independently of the base, simplifying maintenance and equipment servicing.
• This package includes 25 REL-MR-24DC/21AU electromechanical relays featuring 24V DC coils and one SPDT changeover contact per relay. Their multi-layer gold-plated contacts are particularly suited to low-level signal switching. Phoenix Contact specifies a continuous current limit of 50mA with the gold contact layer intact; higher-current ratings apply only under the manufacturer's stated conditions when that layer has been destroyed.
• The remaining relay base contains one OPT-24DC/48DC/100 miniature solid-state relay. This relay uses a 24V DC control input and provides a normally open electronic output for switching 3–48V DC loads at up to 100mA.
• The PLC-BSC-24DC/21 bases support conductors from 0.14mm² to 2.5mm², corresponding to 26–14 AWG, with M3 screw terminals and a recommended tightening torque of 0.6–0.8 Nm.
• This 26-module package is suitable for industrial control cabinet assembly, PLC interfacing, low-level signal switching, equipment maintenance, and replacement of compatible relay assemblies.
• Two unmarked plug-in bridges are also supplied as complimentary spare accessories. These pieces were custom-cut during the original installation and were previously used to bridge sections of an assembly spanning 12 modules. Their manufacturer, original part number, exact electrical configuration, and ratings have not been independently verified. They are provided free of charge because they accompanied the original equipment and are not factored into the listing price or considered part of the primary product. Buyers should independently verify compatibility, physical fitment, electrical ratings, and suitability before use.

Product Information

• Brand: Phoenix Contact
• Model Number: PLC-BSC-24DC/21
• Series: PLC-INTERFACE
• MPN: 2966016
• SKU: 2966016
• Type: DIN Rail Relay Interface Module
• Relay Base Type: PLC Relay Socket
• Number of Relay Bases: 26
• Number of Installed Relays: 26
• Electromechanical Relay Quantity: 25
• Solid-State Relay Quantity: 1
• Number of Poles: 1 (Depending on Installed Relay)
• Connector Style: Plug-In Relay Interface
• Compatible Mounting Type: DIN Rail NS 35/7.5
• Termination Type: Screw Terminal
• Compatible Wire Gauge (AWG): 26–14 AWG
• Conductor Cross-Section: 0.14–2.5mm²
• Nominal Input Voltage: 24V DC
• Protective Circuit: Damping Diode / Polarity Protection Diode
• Status Indicator: Integrated LED
• Screw Thread: M3
• Recommended Tightening Torque: 0.6–0.8 Nm
• Wire Stripping Length: 8mm
• Mounting Width: 6.2mm
• Height: 80mm
• Depth: 94mm
• Housing Color: Gray (RAL 7042)
• Housing Flammability Rating: UL 94 V-0
• Relay Base Operating Temperature: -40°C to +60°C
• Mounting Type: 35mm DIN Rail
• Country of Origin (Relay Base): Germany
• Unit Quantity: 26
• Unit Type: Unit

Installed Electromechanical Relay Specifications

• Brand: Phoenix Contact
• Model Number: REL-MR-24DC/21AU
• MPN: 2961121
• Type: Plug-In Electromechanical Relay
• Quantity: 25
• Nominal Coil Voltage: 24V DC
• Contact Configuration: SPDT (1 Changeover Contact)
• Number of Poles: 1
• Relay Operating Mode: Monostable / Non-Latching
• Contact Material: Silver Tin Oxide (AgSnO), Hard Gold-Plated
• Maximum Continuous Contact Current With Gold Layer Intact: 50mA
• Maximum Switching Voltage With Gold Layer Intact: 30V AC / 36V DC
• Maximum Continuous Current After Gold Layer Destruction: 6A
• Typical Coil Current: 7mA at 24V DC
• Coil Resistance: 3390 Ohms ±10%
• Typical Response Time: 5ms
• Typical Release Time: 2.5ms
• Mechanical Service Life: 20 Million Operations

Installed Solid-State Relay Specifications

• Brand: Phoenix Contact
• Model Number: OPT-24DC/48DC/100
• MPN: 2966618
• Type: Miniature Solid-State Relay
• Quantity: 1
• Nominal Control Voltage: 24V DC
• Input Voltage Range: 19.2–28.8V DC
• Contact Configuration: 1 Normally Open Electronic Output
• Output Voltage Range: 3–48V DC
• Maximum Continuous Output Current: 100mA
• Typical Input Current: 7mA
• Typical Response Time: 20 Microseconds
• Typical Turn-Off Time: 300 Microseconds
• Output Circuit: Floating, 2-Conductor
• Protective Circuit: Reverse-Polarity and Surge Protection
• Relay Width: 5mm
• Relay Height: 28mm
• Relay Depth: 15mm

Complimentary Bridge Information

• Type: Custom-Cut Plug-In Bridge Accessories
• Manufacturer: Unverified
• Model Number: Unverified
• Original Part Number: Unverified
• Quantity: 2
• Original Application: Relay Module Interconnection
• Previous Assembly Span: 12 Modules
• Configuration: Custom-Cut / Modified
• Electrical Ratings: Not Verified
• Pricing: Complimentary, Excluded From Product Valuation

Included

• 26x Phoenix Contact PLC-BSC-24DC/21 DIN Rail Relay Bases (2966016)
• 25x Phoenix Contact REL-MR-24DC/21AU Electromechanical Relays (2961121), Installed in Relay Bases
• 1x Phoenix Contact OPT-24DC/48DC/100 Solid-State Relay (2966618), Installed in Relay Base
• 2x Unidentified Custom-Cut Plug-In Bridges — Complimentary Spare Accessories, No Additional Charge
• Total: 26 Populated Relay Modules Plus 2 Complimentary Bridges

Not Included

• DIN Rail
• DIN Rail End Stops
• Additional Relay Modules
• Additional Jumper Bridges
• Installation Screws
• Installation Instructions
• Original Manufacturer Packaging
• Wiring or Additional Electrical Accessories

Please review all photos for the exact item, condition, and components included.