Phoenix Contact PLC Interface Relay Module

Description

This is the PLC-RSC-12DC/21 from Phoenix Contact, a compact and reliable PLC interface relay module. It combines a relay base with screw terminals and a plug-in miniature relay, providing a complete solution for signal switching and galvanic isolation in industrial automation applications. With its narrow 6.2 mm housing, it is perfectly suited for space-saving installations on a DIN rail. The module is designed for a 12V DC coil voltage and features a powerful changeover contact capable of switching up to 6A.

Specifications

• Manufacturer: Phoenix Contact
• Model: PLC-RSC-12DC/21
• Part Number: 2966174
• Input Voltage: 12V DC
• Output Contact: 1 x Changeover Contact (SPDT)
• Contact Material: AgSnO
• Maximum Switching Voltage: 250V AC/DC
• Maximum Continuous Current: 6 A
• Connection Type: Screw connection
• Mounting: DIN rail NS 35/7,5

Label Info

• Socket: PLC-BSC-12DC/21, Ord.-No. 29 66 896
• Relay: REL-MR-12DC/21, No. 2961150

Application

Ideal for use as an interface between a PLC and field devices. Applications include galvanic isolation of signals, voltage level conversion, and amplification of digital output signals for driving contactors, lamps, or small motors.

Country of Origin

Manufactured in Germany.

CO2 Impact

Choosing this reused component over a new one avoids approximately 1.14 kg of CO2 emissions, contributing to a more sustainable industrial environment.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

The mechanical service life is approximately 2 x 10^7 cycles. The electrical service life is dependent on the switched load; please refer to the manufacturer's load limit curve in the datasheet for specific application details.

Yes, the AgSnO contact material is well-suited for switching resistive and inductive loads. For high-frequency switching of significant inductive loads, an external protective circuit (e.g., a freewheeling diode) across the load is recommended to suppress voltage spikes and prolong contact life.

The screw terminals can accommodate a wire size range from 0.14 mm sq to 2.5 mm sq, which corresponds to AWG 26 to AWG 14.

Last Update: Friday, March 13, 2026

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