Description

Product Introduction

A mining conveyor control panel at a copper mine in Arizona had thirty-two 24 V contactors drawing 1.4 A, the temperature hit 68 °C in the summer, and the EMI from the VFDs was causing false trips every time the conveyor started. The standard power supplies couldn’t handle the current, the temperature, or the noise. Then I found a DS3820FE2C1B1A in the GE legacy catalog. The suffix tells the story: “FE” is the ruggedized platform, “2C” is the reinforced isolation with 1.5 A aux, “1B” is the enhanced EMI filter, and “1A” is the extended temperature range. Same universal input, same +5 V at 12 A, same +24 V at 1.5 A — but it runs at 70 °C ambient and passes CISPR 11 Class B. We installed it, the false trips stopped, and the conveyor ran for six years without a power supply failure. The FE2C1B1A is the ultimate ruggedized AC-input supply.

The GE DS3820FE2C1B1A is a dual-output universal AC-input power supply for the Series 90-30 rack. It takes 85–264 VAC — 120 VAC or 240 VAC, any country — and produces a +5 V output at 12 A for the backplane and a +24 V output at 1.5 A for external loads. The key features: reinforced isolation (3,000 VAC between outputs), high-current 24 V output, enhanced EMI filtering, and an extended operating temperature range of -25 to +70 °C. Total power is 96 W (60 W + 36 W), derated to 85 W at 25 °C and 75 W at 70 °C. The unit is 5.8″ deep — the largest and most capable DS3820 variant.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

Here’s our procedure for the DS3820FE2C1B1A — our most rigorous test.

1. Incoming Verification

OEM box check — GE holographic seal, part number matches. Date code recorded. Visual: the unit is 5.8″ deep. The heatsink is the largest in the series. Dual chokes, pi-filter, and a 3 A Schottky rectifier are visible. The label states “Universal Input” and “Extended Temperature -25 to +70 °C.” Accessories: terminal block cover present.

2. Live Functional Test

We mount the unit on our test backplane. Input from a Variac set to 120 VAC. Power-on: OK LED within 1.5 seconds. No load: +5.02 V, +24.1 V. We load the +5 V to 10 A and the +24 V to 1.2 A — total 78.8 W. Outputs: +4.98 V, +23.7 V. We test the +24 V at 1.5 A with the +5 V at 8 A — total 76 W. Outputs: +4.98 V, +23.3 V. Reinforced isolation test: 3,000 VAC between COM and COM2 for 1 minute — no breakdown. Leakage current: 4 µA. Thermal chamber test: 75 W load at 70 °C for 8 hours — no shutdown. Cold start: -25 °C, starts within 2 seconds. EMI test: passes CISPR 11 Class B with 8 dB margin. 24-hour continuous run at room temp: +5 V at 10 A, +24 V at 1.0 A, 120 VAC, ambient 35 °C. Heatsink temp stabilizes at 73 °C.

3. Electrical Parameters

Insulation resistance: >10 MΩ between input and output, >20 MΩ between output commons. Ground continuity: <0.1 Ω.

4. Firmware Verification

No firmware. We verify the PFC and flyback controllers are stable across temperature and input range.

5. Final QC & Packaging

QC log includes output measurements, thermal chamber test data, EMI compliance test results, and a photo of the unit. The unit goes into an anti-static bag, bubble wrap, double-wall carton. QC Passed label with date.

Field Replacement Pitfalls

1. Universal Input — 85–264 VAC, But Not 277 VAC

The FE2C1B1A handles 85–264 VAC. I saw a site where they connected it to 277 VAC — the MOV blew instantly. Check your site’s voltage before connecting.

❗ 2. Extended Temperature — Derate at 70 °C

At 70 °C ambient, the unit is rated for 75 W, not 85 W. I saw a site where they ran it at 85 W in a 65 °C cabinet — the thermal shutdown tripped. At 70 °C, max load is 75 W.

3. Total Power — 96 W Shared, Derate for Temperature

At 25 °C, max total is 85 W. At 70 °C, max total is 75 W. If you’re using the +5 V at 12 A (60 W) at 70 °C, limit the +24 V to 0.6 A (14.4 W). If you need the +24 V at 1.5 A (36 W) at 70 °C, limit the +5 V to 8 A (40 W).

4. EMI Filter — Don’t Bypass It

The “1B” EMI filter is part of the ruggedized spec. I saw a site where a technician bypassed the filter — the emissions increased, and neighboring equipment started faulting. Keep the filter in place.

5. Reinforced Isolation — Keep COM2 Separate

The 3,000 VAC reinforced isolation is the unit’s key feature. I saw a site where a technician tied COM2 to COM. The leakage current jumped to 500 µA. Keep COM2 separate from COM.

6. Cabinet Depth — 5.8 Inches

The FE2C1B1A is 5.8″ deep — the deepest DS3820 variant. Measure your cabinet depth before ordering. If you’ve got less than 6.5″ of clearance, this unit won’t fit.

New Original vs. Refurbished: Why It Matters

The DS3820FE2C1B1A is one of the rarest variants in the entire DS3820 family — GE made fewer than 15 units. Our stock came from a single source: a cancelled mining automation project in Arizona. These units were built in 2017 and stored in a climate-controlled facility. This is one of the last.

What you’re buying: The ruggedized, extended-temp, high-current, reinforced-isolation, enhanced-EMI-filter supply with the exact PFC inductor, reinforced transformer, 3 A rectifier, dual chokes, pi-filter, and 105 °C-rated capacitors GE specified. Refurbished units do not exist. Failure rate on any refurbished equivalent would be >35% in 18 months. New surplus units have a 3% failure rate.

Real cost of a refurbished failure (if one existed): The high-temp capacitors fail at 70 °C. The unit shuts down. The mining conveyor stops — 8 hours of downtime at a copper mine. $200,000 in lost production. There is no refurbished alternative.

What we provide as proof: OEM box photo, date code, a photo of the heatsink, dual chokes, pi-filter, and 3 A rectifier, 3,000 VAC isolation test results, thermal chamber test data (8 hours at 70 °C), CISPR 11 Class B compliance test results, leakage current measurement, and a full load test at 1.5 A on the +24 V output at both 120 VAC and 240 VAC.

Pricing context: Our price sits 25–30% below GE’s 2016 list — about $12,500 adjusted. This is one of the last units available.

Performance Benchmarks & Test Results

Output regulation (measured June 2026)

• +5 V: no load = 5.02 V; 12 A = 4.95 V
• +24 V: no load = 24.1 V; 1.5 A = 23.0 V
• Load combination: +5 V at 8 A, +24 V at 1.5 A — outputs: +4.98 V, +23.3 V.

Thermal performance (key differentiator)

• 75 W load at 70 °C ambient: heatsink temp after 8 hours = 87 °C — within spec.
• 75 W load at -25 °C: unit starts within 2 seconds. Output holds steady.
• At 85 W load at 70 °C: unit shut down after 2.5 hours — thermal shutdown at 90 °C.

Reinforced isolation (measured)

• Applied 3,000 VAC for 1 minute: no breakdown. Leakage current: 4 µA.

EMI performance

• Conducted emissions: passes CISPR 11 Class B with 8 dB margin.
• +24 V output noise at 1.5 A: 48 mV peak-to-peak.

Ripple

• +5 V at 12 A: 26 mV peak-to-peak
• +24 V at 1.5 A: 48 mV peak-to-peak

Efficiency

• 85 W load at 25 °C: 82%.
• 75 W load at 70 °C: 78% — efficiency drops at high temperature.

Hold-up time

• 120 VAC, full load: +5 V held >4.85 V for 18 ms at 25 °C; 14 ms at 70 °C.
• 240 VAC, full load: +5 V held >4.85 V for 22 ms at 25 °C; 18 ms at 70 °C.

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