Description
MITSUBISHI A1S61PN – Power Supply Module for MELSEC-A Series Racks
The MITSUBISHI A1S61PN is a rack-mounted power supply module for MELSEC-A series PLC systems. From my experience, it’s the go-to PSU when you want a stable 5 V system bus for small to mid-size A-series configurations, without overcomplicating the panel. It typically supports a CPU plus several I/O and a couple of special-function modules, making it a practical choice for maintenance teams keeping legacy A-series lines running efficiently.
Our Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery time: 1 week if in stock; no more than 1 month at the latest
- Payment: 50% advance payment, full payment before delivery
- Express delivery options: FedEx, UPS, DHL
Key Features
- Designed for MELSEC-A Series racks – slides into the dedicated PSU slot on A-series base units for quick replacement.
- Universal AC input – typically supports 100–240 VAC, 50/60 Hz, so it fits most plant power standards without extra transformers.
- Stable 5 V backplane supply – sized for common A-series CPU and I/O combinations; helps reduce intermittent resets and bus errors.
- Auxiliary 24 V DC rail – in many cases available for light loads and module needs; not intended as a field device power supply.
- Protection and status – built-in protection with status indicators to speed up troubleshooting during commissioning or maintenance.
- Drop-in service part – compatible with existing A-series bases, helpful for line upgrades or like-for-like replacements.
Technical Specifications
| Brand / Model | MITSUBISHI MELSEC-A / A1S61PN |
| Product Type | Rack Power Supply Module (PSU) |
| HS Code | 8538.90 (Parts for industrial control panels/PLC assemblies) |
| Power Requirements | AC 100–240 V, 50/60 Hz (typical for A-series PSUs) |
| Backplane Supply Output | 5 V DC for system bus (capacity suitable for small to mid-size A-series racks) |
| Auxiliary Output | 24 V DC auxiliary (light loads; module/internal use in many cases) |
| Operating Temperature | 0–55 °C (typical A-series operating range) |
| Signal I/O Types | N/A – provides regulated power rails to the backplane and modules |
| Communication Interfaces | None (power-only module) |
| Installation Method | Slide-in module on MELSEC-A base unit (A1S-series), PSU-designated slot with screw fixation and PE grounding |
| Dimensions & Weight | A-series 1-slot form factor; typical module mass around 0.5 kg |
Application Fields
You might notice that A1S61PN units appear most in long-running plants. Common uses include:
- Packaging and labeling machines where stable 5 V backplane power prevents CPU resets during peak load.
- Automotive assembly lines with legacy MELSEC-A racks needing like-for-like PSU replacements to minimize downtime.
- Water/wastewater pump stations and small treatment skids with mixed I/O and a few special modules.
- Textile and printing equipment where supply noise immunity and fast service swaps matter.
A maintenance lead at a food-packaging site told us their line settled after swapping in a fresh A1S61PN—no more intermittent bus faults when multiple servos kicked in. That seems to be the typical benefit: clean power, calmer system.
Advantages & Value
- Reliability: Consistent backplane power reduces nuisance trips and extends module life.
- Compatibility: Native fit for MELSEC-A bases; no wiring rework, which typically shortens changeout time.
- Cost Control: Keeps legacy A-series assets running; avoids premature migration or full-panel redesign.
- Availability & Support: We stock and source tested units, and can help size the PSU against your module load.
Installation & Maintenance
- Panel environment: Use a closed control cabinet with proper ventilation; avoid heat sources; keep ambient within 0–55 °C.
- Mounting: Install in the PSU-designated slot on the A-series base; secure the module screws and connect protective earth.
- Wiring: Feed from a dedicated, protected AC circuit; use ferrules where applicable; segregate AC from signal wiring to reduce noise.
- Power budgeting: Check total 5 V load of CPU + I/O + special modules; allow safety margin to avoid brownout under peak load.
- Routine care: Quarterly dust removal; visual check of terminals; verify LED status; review error logs if the CPU records power anomalies.
- Lifecycle tips: If ambient runs hot, consider cabinet cooling; firmware updates aren’t applicable to the PSU, but keep CPU firmware current.
Quality & Certifications
- Certifications: CE and UL/cUL are common for MELSEC-A modules; RoHS compliance can vary by production year.
- Manufacturer’s reputation: MITSUBISHI Electric industrial controls are widely adopted in legacy and current lines, which helps with long-term serviceability.
- Warranty: 12 months (365 days) from shipment.
Related/Supporting Components
- A-series base units: A1S-series base racks (e.g., A1S38B) to host the PSU, CPU, and I/O modules.
- Alternative PSU capacities: A1S62PN or A1S63P may be selected if your backplane load is higher.
- Compatible CPUs: A1SJCPU and related MELSEC-A CPUs; verify total 5 V consumption when mixing special function modules.
If you share your current rack configuration (CPU model and module list), we can check the 5 V/24 V power budget and confirm whether A1S61PN covers it or propose an A-series PSU with more headroom.
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