Industrial Automation Power Solution – Mitsubishi Electric PD21 / PD21B | MELSEC-A Series
Where This Product Is Used
The Mitsubishi PD21 and PD21B are dedicated power supply modules designed for the MELSEC-A Series programmable logic controller (PLC) platform. These modules are deployed across a wide range of demanding industrial environments where stable, regulated DC power is critical to system uptime:
- Automotive Manufacturing: Body welding lines, paint shop conveyors, and engine assembly transfer machines rely on MELSEC-A base units powered by PD21/PD21B modules for continuous, shift-long operation.
- Food & Beverage Processing: Bottling lines, filling machines, and packaging conveyors use A-Series PLCs with PD21 power supplies to maintain hygienic, uninterrupted production cycles.
- Chemical & Petrochemical Plants: Process control panels in hazardous areas depend on stable PLC power to manage valve actuators, flow meters, and safety interlocks.
- Steel & Metal Fabrication: Rolling mills, press brakes, and CNC transfer lines use MELSEC-A systems where the PD21B provides the backbone power for I/O and CPU modules.
- Water Treatment & Utilities: SCADA-linked A-Series PLCs controlling pump stations and filtration systems require reliable power modules for 24/7 unattended operation.
- Machine Tool & Robotics: Coordinate measuring machines (CMMs) and robotic workcells integrated with MELSEC-A controllers use PD21 modules as the primary power source.
Technical Specifications
| Parameter | PD21 | PD21B |
|---|---|---|
| Series | MELSEC-A (A-Series) | |
| Module Type | PLC Power Supply Module | |
| Manufacturer | Mitsubishi Electric | |
| Input Voltage | AC 100–240 V | AC 100–240 V |
| Output Voltage | DC 5 V | DC 5 V |
| Weight | ~4,460 g (module + packaging) | |
| Mounting | MELSEC-A Base Unit slot | |
| Compliance | CE, UL (verify with datasheet) | |
Note: Always verify specifications against the official Mitsubishi Electric MELSEC-A hardware manual before system design.
Why Engineers Specify This Model
- Platform Compatibility: Engineered exclusively for MELSEC-A base units — no adaptation or conversion required.
- Proven Field Reliability: MELSEC-A systems have accumulated decades of installed-base hours in heavy industry; PD21/PD21B modules are a known-good, low-risk replacement choice.
- Wide AC Input Range: Accepts 100–240 V AC, making it suitable for both domestic (220 V) and export (110 V) machine configurations without hardware changes.
- Drop-in Replacement: Identical form factor and connector pinout to original OEM modules — minimizes downtime during maintenance replacement.
- Stable 5 V DC Output: Provides clean, regulated power to CPU, I/O, and communication modules within the A-Series backplane.
Complete System Bill of Materials
A typical MELSEC-A control panel using the PD21/PD21B includes the following components. Konmask.com stocks many of these parts:
- Power Supply Module: PD21 / PD21B (this item)
- CPU Module: A2SHCPU, A3NCPU, A1SCPU, or equivalent
- Base Unit: A1S38B, A1S52B, A38B, or equivalent
- Digital Input Module: AX40, AX80, or equivalent
- Digital Output Module: AY40, AY80, or equivalent
- Analog I/O Module: A68AD, A62DA, or equivalent
- Programming Cable / Adapter: SC-09, USB-SC09-A
- Programming Software: GX Developer or GX Works2 (legacy support)
Compliance & Industry Standards
- Designed to meet IEC 61131-2 PLC hardware requirements
- CE marking for European machinery directive compliance
- UL recognition for North American industrial panel applications (verify on unit label)
- RoHS-compliant manufacturing (confirm with batch documentation)
- Compatible with GB/T 15969 (Chinese national PLC standard) application environments
Quality Assurance & Sourcing
Konmask.com specializes in sourcing genuine, tested industrial automation components for MRO (Maintenance, Repair & Operations) and system integration projects. Our PD21 / PD21B units are:
- Sourced from authorized distributors and verified supply chains
- Inspected for physical integrity, label authenticity, and connector condition prior to dispatch
- Packaged in anti-static, shock-resistant materials for safe international shipping
- Accompanied by documentation upon request (test reports, COO certificates)
How to Source This Part
- Confirm your base unit model — verify your MELSEC-A base unit accepts PD21 or PD21B (check the slot label or hardware manual).
- Check stock availability — contact us for real-time inventory status and lead time.
- Request a quote — email [email protected] with your quantity and delivery requirements.
- Place your order — we support T/T bank transfer, PayPal, and trade-term arrangements (EXW, FOB Xiamen).
- Receive & verify — all shipments include a packing list; contact us within 7 days if any discrepancy is found.
Application-Specific FAQ
Q: Is the PD21B a direct replacement for the PD21?
A: In most MELSEC-A base unit configurations, yes. Both modules share the same form factor and output characteristics. Confirm with your hardware manual or contact us for clarification.
Q: Can I use this power supply with MELSEC-Q or MELSEC-L series?
A: No. The PD21/PD21B is designed exclusively for the MELSEC-A platform. MELSEC-Q uses Q-series power supplies (e.g., Q61P, Q62P).
Q: What is the typical lead time for this module?
A: In-stock units ship within 1–3 business days. Out-of-stock units typically have a 2–6 week lead time depending on sourcing. Contact us for current availability.
Q: Do you provide a warranty?
A: Yes. We offer a 90-day functional warranty on all modules. Units that fail under normal operating conditions within this period are eligible for replacement or refund.
Q: Can you supply multiple units for a plant-wide MRO program?
A: Yes. We support bulk orders and long-term supply agreements. Contact us to discuss pricing tiers and scheduled delivery.
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