Phoenix Contact PLC-RSC-230UC/21-21 Relay Module 230 V

PLC-RSC-230UC/21-21: relay module with 230 V coil and 2 changeover contacts

The Phoenix Contact PLC-RSC-230UC/21-21 (order no. 2967099) is a two-contact PLC-INTERFACE module with a 230 V AC / 220 V DC coil. The code reads 230UC for the coil voltage and 21-21 for two changeover contacts. It is 14 mm wide, 80 mm high and 94 mm deep. The input range is 179.4 to 264.5 V AC and 171.6 to 264 V DC at 20 degrees C.

Seven Star LLC supplies the PLC-RSC-230UC/21-21 as an independent supplier in Muscat for projects in Oman and the GCC, quoted against the exact part number shown here.

Technical specifications of the PLC-RSC-230UC/21-21

How the PLC-RSC-230UC/21-21 works

The PLC-RSC-230UC/21-21 is a PLC-INTERFACE module: a narrow basic terminal block with screw terminals on which a miniature plug-in relay is fitted. The block carries the coil input with its protective circuit and a yellow LED that shows when the coil is energised, and routes the contact(s) to separate screw terminals. Because the relay is plugged in, it can be replaced without rewiring. The coil side and the contact side are electrically isolated, with the test voltage in the table, which lets a low-voltage controller output switch a load on a different voltage level.

Typical input current is only 4.5 mA at 230 V AC. The module has two changeover contacts of AgNi material and a maximum inrush current of 15 A for 300 ms, allowing it to switch two circuits at once or to provide an extra contact for feedback.

Where the PLC-RSC-230UC/21-21 fits in a system

Modules like this are placed between a PLC output card (or a field sensor) and a load that the controller cannot drive directly: solenoids, contactors, signal lamps, small motors. They also give isolation and a replaceable wear element, so a failed contact does not mean rewiring a whole output card. In the PLC-RSC range, the choice of coil voltage, number of changeover contacts and contact material is what separates the variants.

Use the PLC-RSC-230UC/21-21 when the controller output is a mains-level signal, such as a thermostat, a pressure switch on 230 V or an older relay-based panel. It avoids an extra control-voltage transformer.

Selection and ordering checklist

• Confirm the coil voltage of the PLC-RSC-230UC/21-21 against the controller output: DC or AC, and the tolerance range in the table.
• Check that the PLC output can supply the typical input current.
• Confirm the load voltage and current are within the switching data, including inrush.
• Check the contact material (standard or gold-plated) against the load level, because small signals need gold.
• Check the number of changeover contacts needed.
• Consider the divider plate and bridging accessories for neighbouring modules at higher voltages.
• Check mains-side wiring and the need for divider plates between adjacent modules.

Installation, commissioning and maintenance of the PLC-RSC-230UC/21-21

Clip the PLC-RSC-230UC/21-21 on a 35 mm DIN rail, wire the coil and contact terminals with screwdriver torque of 0.6 to 0.8 Nm and insert the relay. Check polarity on DC coils. At commissioning, switch each channel and confirm with the LED that the coil is energised, then measure the contact state.

Because the control side is at mains potential, observe the insulation and separation data and install the divider plate where required for adjacent modules above 250 V.

Typical applications in Oman and the GCC

In Oman and the GCC, relay interface modules are used in pump, valve and compressor control panels, in lighting control and in building management systems. The temperature range in the table covers most indoor cabinets, but outdoor panels with strong solar load should be checked against the upper limit.

Mains-level signals appear in GCC HVAC panels and older pump controls, where this module can add isolation and a second contact.

Comparison with related PLC-INTERFACE relay modules

Information to send with an RFQ

• Full part number PLC-RSC-230UC/21-21 and quantity.
• Coil voltage and type (DC or AC).
• Load voltage, current and type (resistive, inductive or lamp).
• Number of changeover contacts needed.
• Cabinet ambient temperature.
• Delivery location and date.

Documents and quotation

Send us the part number PLC-RSC-230UC/21-21 and the quantity you need, and we will confirm which official documents are available for this device. Seven Star LLC is an independent supplier in Muscat and quotes for projects across Oman and the GCC; we do not act on behalf of the manufacturer.

Please also tell us the delivery location and required timeline so that availability can be checked before you commit to a project schedule.