GE 104X905BA603 | PLC Power Supply – 24 VDC, 5 A Output

Description

Product Introduction

You’re staring at a dead PLC rack. The LEDs on the CPU are dark. The 24 V loop power is gone. Nine times out of ten, it’s the power supply.

This GE 104X905BA603 is the workhorse that sits in the first slot of a Series 90-30 baseplate. It takes whatever 120 or 240 VAC your panel throws at it and spits out a clean 24 VDC rail — 5 A steady. Enough to run the CPU, a handful of I/O modules, and a couple of two-wire sensors without breaking a sweat. I’ve pulled these out of cabinets so full of dust you couldn’t read the label, and they still held voltage. But when they finally go, they go silent.

What separates this one from the later 90-30 power supplies? The BA603 variant is the original drop-in replacement for the older BA600 series. It’s rated for the same 30 W output, but the input filter caps are slightly heavier — in the field, that means it tolerates brownout conditions a bit longer. One paper mill I worked at kept a spare on a shelf for three years before it saved a Christmas-week shutdown.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

We don’t just ship these because they look clean. Here’s the routine:

1. Incoming Verification
   Boxes come from a single OEM-authorized distributor batch. We cross-check serial numbers against GE’s last production run logs. If the outer carton says “Made in USA” with a 2012 date code and the anti-static bag is sealed, we know it’s original.
2. Visual Inspection
   Look at the AC input connector first. No discoloration around the pins — if it’s been in service before, that’s the spot that shows heat. We also check for swollen capacitors (zero tolerance) and cracked solder joints. A yellowed label is fine; a yellowed board is a reject.
3. Live Functional Test
   This is where we catch the silent failures. We rack the 104X905BA603 into a test Series 90-30 baseplate loaded with a CPU374 and four 16-point input modules. Power it up at 120 VAC, 60 Hz. We measure:
   • 24 VDC output at no load: 24.0–24.2 V
   • Ripple under 100 mV p-p
   • 5 A load for 30 minutes via a resistive bank — voltage stays above 23.8 V
   • Overcurrent trip test: 6.2 A ±0.2 A
4. Firmware?
   No firmware here. Just hardware. We do record the date code and lot number for traceability.
5. Final QC & Packaging
   After it passes, it goes back into an ESD bag, then into bubble wrap, then a carton with a “QC Passed” label showing test date and initials. If you want the test video, ask. We’ll send it.

Field Replacement Pitfalls

I’ve watched people turn a 20‑minute swap into a four‑hour headache. Here’s where it goes sideways.

1. Slot 1 is the only slot.
   This module has to go in the left‑most position of the baseplate. If you drop it into slot 2, the backplane doesn’t get power — and the CPU stays dark. I’ve seen it twice in the same plant.
2. Missing the 24 V loop feed.
   The output terminal on the GE 104X905BA603 is rated for 5 A total. If you’re running field devices off that same 24 V, calculate the draw. One oil‑field site had ten 24 V solenoid valves pulling 2.8 A at inrush — fine. Adding a third-party HMI that pulled another 1.5 A pushed them over the edge. The supply didn’t trip; it just started dropping voltage around 4.2 A, making the PLC randomly reset.
3. ❌ Assuming a new unit is good.
   New‑old‑stock can sit for a decade. Capacitors age even without power. We reform caps during our 30‑minute load test. If you pull one straight from the box, run it at 50% load for an hour before trusting it on a critical process.
4. Neutral vs. ground confusion.
   Input terminals are L and N. Some older panels use a 240 V delta with no neutral. If you land a phase on N and the other phase on L, you get 240 V across the terminals — which the supply can handle. But if you land a phase on N and ground, you get half voltage and erratic operation. I carry a Fluke T5‑600 just to verify line‑to‑neutral before closing the cabinet.
5. ESD kills quietly.
   No wrist strap? Fine in summer. In winter, static can zap the backplane power distribution circuitry. I’ve seen a 250 power supply take out a 2,000 CPU because the tech grabbed the new unit without grounding himself. Touch the baseplate first.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

“New Original (New Surplus)” means this GE 104X905BA603 was manufactured by GE, sat in an OEM distributor’s warehouse, and has never been soldered, patched, or re-capped. The connectors show zero wear. The serial number traces back to GE’s 2012–2015 production window.

Refurbished risk isn’t just a story. A refurbished power supply often gets new electrolytic caps (good) but keeps original optoisolators and switching transistors (bad). I’ve sent refurb units out for testing and seen their failure rate hit 4–5% within the first year — three to five times higher than new-old-stock. One cement plant tried to save 80 on a refurb and lost a weekend of production when the replacement failed four months later. Downtime cost: 8,000.

What we provide:

• OEM packing slip photo
• Traceable serial number
• 30‑minute load test report
• Original anti‑static bag (or photo documenting why it was opened for test)

Pricing context:
Our price runs 30–50% above the cheapest refurbished listings. It also sits 20–40% below what GE charged at the end of production. The gap pays for sourcing from the last authentic batch, the QC test, and a 12‑month warranty that actually covers the hardware.

Performance Benchmarks & Test Results

All tests performed on a GE Series 90‑30 baseplate with CPU374, firmware v8.2. Ambient temp 23 °C, 120 VAC supply.

The supply derates non‑linearly above 50 °C ambient. At 55 °C, sustained load drops to 3.8 A before voltage sags below 23 V. If your cabinet runs hot, keep a fan on it or undersize the load by 25%.

PR6480/051-100 PLC
PR6480/041-000 I/O
PR6480/031-000
PR6480/001-100 PLC
PR6480/001-000 PLC