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Brand: Phoenix Contact
Phoenix Contact PLC-RSC-12DC/21 Relay Module 12 V DC
Description
PLC-RSC-12DC/21: relay module with 12 V DC coil and 1 changeover contact
The Phoenix Contact PLC-RSC-12DC/21 (order no. 2966906) is the 12 V DC coil version of the single-contact PLC-INTERFACE module with screw terminals. It is 6.2 mm wide, 80 mm high and 94 mm deep. The coil input range is 9.72 to 16.8 V DC at 20 degrees C.
Seven Star LLC supplies the PLC-RSC-12DC/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-12DC/21
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Phoenix Contact PLC-RSC-12DC/21 (order no. 2966906) |
| Nominal input (coil) voltage | 12 V DC |
| Input voltage range | 9.72 V DC – 16.8 V DC (20 °C) |
| Typical response time | 5 ms |
| Typical release time | 8 ms |
| Typical input current | 15.3 mA |
| Contact configuration | 1 changeover contact |
| Contact material | AgSnO |
| Maximum switching voltage | 250 V AC/DC (The divider plate PLC-ATP should be installed for voltages larger than 250 V (L1, L2, L3) between identical terminal blocks in adjacent modules. Potential bridging is then carried out with FBST 8-PLC– or –FBST 500–) |
| Limiting continuous current | 6 A |
| Maximum inrush current | 10 A (4 s) |
| Minimum switching current | 10 mA (12 V) |
| Interrupting rating, ohmic load | 140 W (at 24 V DC); 20 W (at 48 V DC); 18 W (at 60 V DC); 23 W (at 110 V DC); 40 W (at 220 V DC); 1500 VA (for 250 V AC) |
| Switching capacity | 2 A (at 24 V, DC13); 0.2 A (at 110 V, DC13); 0.1 A (at 220 V, DC13); 3 A (at 24 V, AC15); 3 A (at 120 V, AC15); 3 A (at 230 V, AC15) |
| Mechanical service life | 2x 107 cycles |
| Test voltage winding/contact | 4 kV AC (50 Hz, 1 min., winding/contact) |
| Ambient temperature (operation) | -40 °C – 60 °C |
| Degree of protection | RT III (Relay) |
| Output fuse | 4 A gL/gG NEOZED |
| Connection method | Screw connection |
| Tightening torque | 0.6 Nm – 0.8 Nm |
| Dimensions (W x H x D) | 6.2 x 80 x 94 mm |
How the PLC-RSC-12DC/21 works
The PLC-RSC-12DC/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.
The contact data matches the other single-contact modules: a changeover contact with AgSnO material, 6 A limiting continuous current and 250 V AC/DC maximum switching voltage. The difference is the lower coil voltage, which suits 12 V controllers.
Where the PLC-RSC-12DC/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-12DC/21 where the control signal comes from a 12 V system, such as vehicle-style electronics, battery-backed security panels or embedded controllers. In 24 V PLC panels the 24 V modules are the standard choice.
Selection and ordering checklist
- Confirm the coil voltage of the PLC-RSC-12DC/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.
- Confirm the 12 V source can supply the coil current of all modules on the rail.
Installation, commissioning and maintenance of the PLC-RSC-12DC/21
Clip the PLC-RSC-12DC/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.
Check the datasheet for the typical input current and the response times before wiring many modules onto a small 12 V source.
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.
12 V systems appear in telecoms, solar-powered monitoring stations and security panels across the GCC.
Comparison with related PLC-INTERFACE relay modules
| Device | Distinguishing data |
|---|---|
| PLC-RSC-24DC/21 (2966171) | 1 changeover contact, 24 V DC, on our site |
| PLC-RSC-24DC/21-21 (2967060) | 2 changeover contacts, 24 V DC, on our site |
| PLC-RSC-24UC/21 (2966184) | 1 changeover contact, 24 V AC/DC coil |
| PLC-RSC-12DC/21 (2966906) | 1 changeover contact, 12 V DC coil |
| PLC-RSC-230UC/21-21 (2967099) | 2 changeover contacts, 230 V AC/220 V DC coil |
| PLC-RSC-24DC/21-21AU (2967125) | 2 changeover contacts, 24 V DC, gold contact for small signals |
| PLC-RSC-230UC/21 (2966207) | 1 changeover contact, 230 V coil, on our site |
Information to send with an RFQ
- Full part number PLC-RSC-12DC/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-12DC/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.
Other Models in the Phoenix Plc Rsc Range
Seven Star LLC supplies models from the Phoenix Plc Rsc range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Phoenix Contact PLC-RSC-24UC/21 Relay Module 24 V AC/DC | PLC & I/O Cards | View details |
| Phoenix Contact PLC-RSC-12DC/21 Relay Module 12 V DC | PLC & I/O Cards | You are viewing this model |
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About brand
Phoenix Contact is a German, family-owned manufacturer of electrical connection technology and industrial automation, founded in 1923 in Essen by Hugo Knümann. It began as a sales company, and in 1928 Knümann developed the modular terminal block mounted on a rail, the product the company is still best known for. Phoenix Contact is headquartered in Blomberg, North Rhine-Westphalia.
Seven Star LLC lists Phoenix Contact surge protection, power supplies and safety relays, and sources these components by order number for panel builders and maintenance teams in Oman.
Phoenix Contact company profile
| Founded | 1923, Essen, Germany, by Hugo Knümann, as Phönix Elektro- und Industrie-Bedarfsgesellschaft |
|---|---|
| Headquarters | Blomberg, Germany |
| Ownership | Family-owned (Eisert and Stührenberg families) |
| Key invention | The modular terminal block on a DIN rail, 1928 |
| Product families | CLIPLINE terminal blocks, PCB terminals and connectors, QUINT and TRIO power supplies, relay modules, surge protection, signal conditioners, Ethernet switches and PLCnext controllers |
Milestones
- 1923: Hugo Knümann founds the company in Essen.
- 1928: The first modular terminal block is developed.
- Later: Headquarters move to Blomberg, Ostwestfalen-Lippe.
Phoenix Contact parts listed on this page
The TTC-6-2X1-24DC-UT (order number 2906799) is a surge protection device with screw connection for two 24 V DC signal wires that share a common reference potential. The QUINT-PS/1AC/24DC/10 is a single-phase DIN rail power supply delivering 24 V DC at 10 A. The PSR-SCP-24DC/ESP4/2X1/1X2 (order number 2981020) is a single-channel PSR safety relay for emergency stop and safety door monitoring, with two enabling current paths and plug-in screw terminals.
Phoenix Contact products we list
Ordering Phoenix Contact components: what we need
Phoenix Contact items are ordered by a seven-digit order number together with the type designation, both printed on the side of the module. Send both, plus the quantity. If the number is unreadable, send the type text and a photo. For power supplies, state input voltage, output current and whether the unit runs in parallel or with a redundancy module. For buyers in the GCC replacing an older unit, we check the manufacturer's documentation for the listed successor type.
Facts checked against Phoenix Contact's own company history (phoenixcontact.com), October 2026.
Browse Phoenix Contact products by category: Isolator & Barrier, Power Modules, Automation Accessories.
FAQ
Questions about the Phoenix Contact PLC-RSC-12DC/21 Relay Module 12 V DC
Answers from our engineering team on installation, compatibility and integration.
01What is the coil voltage?
12 V DC, with an input range of 9.72 to 16.8 V DC at 20 degrees C.
02How many contacts?
One changeover contact.
03What is the maximum switching voltage?
250 V AC/DC.
04What is the module width?
6.2 mm.
05What are the terminals?
Screw terminals with M3 thread.
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