Description
Product Introduction
The MEAN WELL DRP-240-24 is a 240W single-output industrial DIN rail power supply engineered to deliver reliable 24V DC power to PLCs, sensors, drives, and auxiliary control circuits. Featuring a heavy-duty metal enclosure, universal AC input voltage range, and built-in active Power Factor Correction (PFC), it has served as a foundational power source across automation cabinets worldwide for decades.
Designed for harsh electrical environments, the DRP-240-24 includes integral overvoltage, overload, and short-circuit protection stages. While MEAN WELL has transitioned newer designs to smaller form factors (such as the NDR or NDR-240 lines), the original DRP-240-24 remains a critical direct replacement unit. Keeping the exact physical chassis footprint and terminal layout avoids rewiring main DC bus trunks or re-drilling panel backplates in existing field cabinets.
Key Technical Specifications
| Parameter | Value |
| Output Voltage | 24V DC (Adjustable from 24V to 28V DC via front trim pot) |
| Rated Output Current | 10A |
| Rated Output Power | 240W |
| Input Voltage Range | 85–264V AC / 120–370V DC |
| Input Frequency | 47–63 Hz |
| Efficiency | ~84% |
| Power Factor | PF > 0.95 at full load (Built-in active PFC function) |
| Protection Modes | Short Circuit / Overload (Constant current limiting) / Overvoltage / Over-temperature |
| Isolation Class | Class I (with PE grounding lug) |
| Cooling | Free air convection cooling (no internal fan required) |
| Operating Temperature | -10°C to +60°C (with output derating above 45°C) |
| Mounting Format | Standard TS-35 / 7.5 or 15 DIN rail |
Application Scenarios & The “Trench” Experience
A classic field headache happens during a mid-shift line halt when the main 24V DC power supply sags under load or completely shorts out. When the 24V bus dies, every proximity sensor, safety relay coil, and operator panel goes dark simultaneously, making diagnostic logging impossible. The immediate impulse might be to grab a modern, slimline 240W unit from the shop shelf, but its mounting clip depth and screw terminal positions don’t align with the tightly bundled wire comb in the legacy panel. Sourcing an exact DRP-240-24 direct replacement allows you to snap the unit onto the existing DIN rail, drop the heavy DC power leads into the familiar screw terminal blocks, and restore control power without a lengthy panel modification.
- Control Panel Main DC Bus – Supplying clean 24V DC power to PLC CPU racks, expansion I/O blocks, and touch HMIs.
- Packaging & Conveyor Systems – Driving 24V DC solenoids, photo-eye sensors, pneumatic manifold valves, and stack lights.
- Motor Drive Auxiliary Circuits – Providing control voltage to VFD control boards, contactor coils, and safety interlocks.
- Water & Wastewater Control Stations – Powering remote telemetry units (RTUs), flowmeters, and signal isolators in outdoor enclosures.
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them under actual electrical loads. Every DRP-240-24 unit undergoes a strict 5-step quality verification before leaving the facility:
- Inbound Visual Inspection: Check aluminum chassis for denting, rail-clip spring integrity, screw terminal thread health, and internal capacitor swelling.
- Cold Power-On Test: Verify initial startup behavior, soft-start circuit delay, and zero-load output voltage stability.
- Full-Load Burn-In Check: Connect to a variable electronic DC load bank at 24V/10A for continuous run time to monitor thermal stability and voltage regulation.
- Protective Stage Verification: Test over-current limiting threshold and short-circuit auto-recovery functionality.
- Final Cleanup & Packaging: External terminal terminal cleaning, anti-static wrapping, and high-impact custom foam packaging for transport.
DRP-240-24
DRP-240-24
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Watch Out for Thermal Derating and Airflow Space! The DRP-240-24 relies purely on natural air convection. Do NOT pack terminal blocks, wire ducting, or other hot components directly against the side ventilation slots of the chassis. Leave at least 15–20 mm of side clearance and 50 mm above and below the unit, or it will thermal-trip on hot summer afternoons.
❗ Set Output Voltage BEFORE Connecting Sensitive Electronics! There is a front-panel potentiometer (V+ ADJ) that allows output voltage adjustment from 24V up to 28V DC (to compensate for long wire voltage drops). Before hooking up delicate 24V sensors or controller cards, check the output voltage with a calibrated multimeter to ensure a previous tech didn’t leave it cranked to 28V DC!
⚠️ Verify Wire Gauge and Terminal Tightness A 10A continuous DC draw requires adequate wire cross-section (minimum 14–16 AWG for main DC trunks). Loose screw connections on high-current DC output terminals will create high contact resistance, leading to melted terminal plastics or erratic brownouts on your 24V bus line.
❗ Earth Grounding is Mandatory for Noise Suppression Do not skip connecting the Frame Ground (FG) terminal to the main panel grounding busbar. The built-in active PFC and EMI filtering circuits rely on a solid earth connection to dump high-frequency switching noise; running it ungrounded can induce signal jitter on adjacent analog 4–20mA loops.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the MEAN WELL DRP-240-24 still in active production? A: The DRP-240 series is a legacy line that MEAN WELL has largely replaced with newer series like the NDR-240 or EDR-240. However, original DRP-240-24 units remain available through surplus and specialized industrial inventory for direct drop-in maintenance.
Q: Can I replace a DRP-240-24 with a newer MEAN WELL NDR-240-24? A: Electrically, yes—both output 24V DC at 10A. Mechanically, the NDR-240-24 is significantly narrower (slimline design). If you have room on the DIN rail, an NDR-240-24 works fine, but if you need exact physical mounting match and wire placement for existing harness lengths, the original DRP-240-24 is ideal.
Q: What happens if the output current exceeds 10 Amps? A: The DRP-240-24 enters constant current limiting mode. If the overload persists or a direct short occurs, the unit reduces output voltage to protect internal components until the fault condition is removed.
Q: Can I run two DRP-240-24 units in parallel for 20A capacity? A: The standard DRP-240-24 is not equipped with active current-sharing circuitry for direct parallel operation. For redundant or parallel operation, external decoupling diodes (ORing diodes) are required to prevent one power supply from back-feeding the other.
Q: What warranty is provided with this power supply unit? A: Every DRP-240-24 power supply shipped comes standard with a full 12-month functional replacement warranty. If any operational defect or power stage failure occurs under standard operating conditions within one year, we provide an immediate replacement or repair.
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