Industrial Power Solution – RELIANCE RSP21-120-24 | RSP21 Series
Where This Product Is Used
The RELIANCE RSP21-120-24 is a 24VDC / 5A / 120W DIN-rail-mount switching power supply engineered for demanding industrial environments. It is widely deployed in:
- PLC Control Panels – Provides stable 24VDC bus power for Siemens, Allen-Bradley, Mitsubishi, and Omron PLC racks and I/O modules.
- Machine Automation Systems – Powers servo drives, HMI panels, and field sensors in CNC machining centers and packaging lines.
- Process Control Cabinets – Supplies regulated DC power to transmitters, solenoid valves, and signal conditioners in chemical, oil & gas, and water treatment plants.
- Building Automation & HVAC – Feeds BACnet/Modbus controllers and actuator networks in intelligent building management systems.
- Conveyor & Material Handling – Drives encoder feedback circuits and safety relay modules on high-cycle conveyor systems.
- Robotics & Assembly Lines – Provides clean, ripple-free DC power to collaborative robot (cobot) controllers and vision systems.
Technical Specifications
| Parameter | Value |
|---|---|
| Model / SKU | RSP21-120-24 |
| Brand | RELIANCE |
| Series | RSP21 |
| Output Voltage | 24 VDC |
| Output Current | 5 A |
| Output Power | 120 W |
| Input Voltage | 85–264 VAC (Universal Input) |
| Input Frequency | 47–63 Hz |
| Mounting | DIN Rail (EN 60715 TS35) |
| Operating Temperature | -10°C to +60°C |
| Storage Temperature | -20°C to +85°C |
| Humidity | 20–90% RH (non-condensing) |
| Weight | 1,680 g |
| Protection Class | IP20 (panel-mount) |
Why Engineers Specify This Model
- Wide-range universal AC input (85–264 VAC) eliminates the need for separate transformer stages, simplifying global machine builds.
- High power density at 120W in a compact DIN-rail footprint reduces panel real estate without sacrificing output headroom.
- Low output ripple & noise ensures reliable operation of sensitive analog I/O cards and precision sensors.
- Built-in overload, short-circuit, and over-voltage protection safeguards downstream PLC and drive hardware.
- Convection-friendly thermal design supports 24/7 continuous duty cycles common in process industries.
- RELIANCE brand reliability – trusted by OEMs and system integrators for long service life in harsh environments.
Complete System Bill of Materials
Engineers building a complete 24VDC control panel alongside the RSP21-120-24 typically specify:
- DIN Rail Terminal Blocks (24VDC bus bars, PE rails)
- 24VDC Miniature Circuit Breakers (MCBs) for branch protection
- PLC CPU & I/O Expansion Modules (Siemens S7-1200 / S7-1500, Allen-Bradley Micro820)
- 24VDC Safety Relays (Pilz PNOZ, Schmersal)
- 24VDC Solenoid Valve Manifolds
- Ethernet Managed Switches (24VDC powered)
- HMI Touch Panels (7″–15″ 24VDC)
- UPS Battery Backup Modules (24VDC buffer)
Contact Konmask for bundle pricing on complete BOM sourcing.
Compliance & Industry Standards
- CE Marking – Low Voltage Directive (LVD) 2014/35/EU
- UL 508 / UL 60950-1 (Industrial Control Equipment)
- EN 61000 EMC Compliance
- RoHS Directive 2011/65/EU
- IEC 62368-1 Safety Standard
Quality Assurance & Sourcing
Konmask.com sources the RELIANCE RSP21-120-24 exclusively through verified industrial distribution channels. Every unit undergoes:
- Visual and dimensional inspection against OEM datasheets
- Label and date-code authenticity verification
- Functional power-on test (output voltage, current regulation, protection trip)
- Anti-static packaging with humidity indicator cards for long-haul shipping
Counterfeit-free guarantee backed by our supplier audit program.
How to Source This Part
- Add to Cart – Click “Add to Cart” above for immediate checkout.
- Request a Quote – Need 5+ units or a BOM quote? Email [email protected] for volume pricing.
- Lead Time – In-stock units ship within 1–3 business days. Ex-stock orders dispatched same day before 14:00 CST.
- Global Shipping – DHL Express, FedEx International Priority, and sea freight available.
- Payment – T/T (Wire Transfer), PayPal, credit card, and LC accepted for large orders.
Application-Specific FAQ
Q: Can the RSP21-120-24 power a Siemens S7-1200 PLC system?
A: Yes. The S7-1200 CPU and standard digital I/O modules operate at 24VDC. A 120W supply provides ample headroom for a CPU + 4–6 I/O modules plus field devices.
Q: Is this power supply suitable for outdoor enclosures?
A: The RSP21-120-24 is rated IP20 and designed for panel-mount use. For outdoor or wash-down environments, install inside an IP65/IP66 rated enclosure.
Q: Can multiple RSP21-120-24 units be connected in parallel for redundancy?
A: Parallel operation for N+1 redundancy is possible when units are equipped with active current-sharing or diode-OR modules. Contact our technical team for configuration guidance.
Q: What is the inrush current at startup?
A: Typical inrush current for 120W class switching supplies is 20–40A peak for <1ms. Size your upstream MCB accordingly (recommend Type C or D characteristic).
Q: Do you provide a datasheet or wiring diagram?
A: Yes. Email [email protected] with your order reference and we will supply the OEM datasheet and wiring schematic.
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