Description
Key Technical Specifications
- Manufacturer: ABB
- Model: P0973LQ
- System Family: Foxboro Evo / Enterasys SSA
- Function: Power supply module for SSA chassis switch systems
- Input Voltage: 100-240 V AC, 50/60 Hz
- Rated Output Power: 450 W
- Typical Maximum Power Consumption: 425 W
- Redundancy: Supports 1:1 dual power configurations
- Operating Temperature: 5 to 40 C
- Storage Temperature: -30 to 73 C
- Relative Humidity: 5% to 90%, non-condensing
- Mounting: 19-inch rack installation
- Compatibility: Designed for P0973LN SSA chassis managed switch
Product Introduction
ABB P0973LQ is an AC power supply module used in Foxboro Evo and Enterasys SSA chassis systems. It provides 450 W output and supports redundant power configurations for the P0973LN SSA chassis managed switch.
This is a system-specific power module, so matching the chassis and redundancy setup matters more than the label alone. Verify input voltage, rack fit, and the target switch model before ordering.
- P0973LQ
- P0973LQ
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Chassis will not power up | Failed PSU or missing AC input | ✅ High | Measure 100-240 V AC at the input and check fuse protection | Verify incoming power first, then replace the supply if input is present |
| One PSU alarm active in redundant setup | Failed redundant supply or AC feed issue | ✅ High | Check both AC circuits and PSU LEDs | If one feed is dead, fix the upstream supply before swapping modules |
| Output drops under load | Aging PSU or overload | ✅ High | Measure load current and compare against the 425 W typical max figure | Reduce load and test again before replacement |
| Intermittent resets | Loose rack connection or unstable AC source | ✅ Medium | Inspect rack seating and monitor line stability | Reseat the module and verify the branch circuit |
| Fan noise or thermal alarm | Cooling issue or internal PSU degradation | ✅ Medium | Check airflow, cabinet temperature, and alarm history | Clean the enclosure and test again |
| Redundancy not taking over | Incorrect dual-feed wiring | ✅ High | Confirm two independent AC circuits are present | Rewire per redundant power scheme before blaming the PSU |
| No fault on PSU but chassis is dead | Upstream control or chassis failure | ❌ Low | Check the P0973LN chassis status and internal alarms | Do not replace the PSU until the chassis side is verified |
If you get stuck, send photos of the label, the chassis nameplate, and the fault log to technical support before ordering a replacement.
Frequently Asked Questions
What is ABB P0973LQ?
It is an AC power supply module for Foxboro Evo / Enterasys SSA chassis managed switch systems. ABB listings describe it as a power supply module with redundant operation support.
Is it a direct replacement for the P0973LN chassis?
It is designed for use with the P0973LN SSA chassis managed switch. I would still confirm the exact chassis variant and rack layout before ordering.
Does it support redundancy?
Yes. The published details say it supports 1:1 redundant power configurations and requires two independent AC circuits for full redundant operation.
What input power does it need?
It uses automatic sensing 100-240 V AC at 50/60 Hz. Keep the source within the stated installation limits and use independent fuse protection.
Is it hot-swappable?
Do not assume that. Treat it as a powered chassis PSU, shut the system down or follow the manufacturer’s live-replacement procedure only if the site manual explicitly allows it.
Why is it sold as surplus?
Because it is a niche legacy module for a specific ABB/Foxboro chassis family, so market supply often comes from surplus inventory rather than active factory production.
What should I check before buying?
Match the exact model, the chassis type, the redundancy arrangement, and the rack mounting position. A PSU like this can look generic, but the system fit is not.
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