DS200DTBCG1AAA GE | New Surplus Heavy-Duty Relay Card

Description

Product Introduction

The standard DTBC relay board switches 2 A. That’s fine for small solenoids and indicator lights. But a refinery in Texas had to switch 5 A motor starters. They tried the standard board. The contacts welded shut within a week. The AAA version fixes that. The DS200DTBCG1AAA is the high-power relay board. 8 channels instead of 16 — because the relays are bigger. Each relay is a power relay — 5 A at 250 VAC or 30 VDC. Form C. Gold-flashed silver alloy contacts. The coil is still 24 VDC, but it draws 40 mA instead of 4 mA.

The board has 24 terminal positions — 3 per relay. The relays are socketed — you can replace them without soldering. The sockets are soldered to the board; the relays plug in. The board occupies one slot. The relays are noticeably taller than the standard DTBC relays — about 15 mm above the PCB. The board has 8 yellow LEDs — one per relay. The update rate is 12 ms — relays are slow, and these are bigger relays. The board has no short-circuit protection. If you overload a 5 A relay with 10 A, the contacts will weld. That’s physics.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

Incoming Verification — Visual inspection first. The relays are socketed. Pull one out. Look at the relay base — should have a part number matching Omron G2R-2-S or equivalent. The socket should have clean pins, no corrosion. The relays themselves should have a date code within 2 years of the board’s manufacture. Old relays have hardened grease in the armature pivot. Counterfeit boards sometimes use non-socketed relays soldered directly to the PCB. Those are not AAA boards.

Live Functional Test — Test rack uses a 24 V coil supply, a 5 A resistive load (24 ohms for DC, or a 5 A lamp bank for AC), a multimeter, and a cycle counter. Test each relay sequentially at 25°C. Command relay 1 on. Yellow LED lights. Measure continuity between common and NO contact. Resistance must be below 0.05 ohms. Common to NC must be open. Command relay 1 off. Common to NC below 0.05 ohms. Common to NO open. Repeat for relays 2 through 8.

Then test all relays simultaneously at full load: command all 8 relays on with 5 A resistive load on each. Measure coil current draw from 24 V supply. Must be 320 mA ±20 mA (8 × 40 mA). Run this test for 2 hours. Monitor the temperature of the relay bodies. Any relay exceeding 85°C? Fail. The ambient temperature in the test chamber is 40°C for this test.

Electrical Parameters — Contact resistance at rated load: apply 5 A DC through a closed contact. Measure voltage drop. Calculate resistance — must be below 0.03 ohms initially, below 0.05 ohms after 5,000 cycles. Coil resistance: measure across each relay’s coil pins (through the socket). Must be 600 ohms ±10% at 25°C. Pickup voltage: slowly increase coil voltage. Relay should pull in between 16 V and 20 V. Dropout voltage: should release between 3 V and 5 V.

Isolation test: apply 1500 VAC between open contacts (common to NO when relay is off). Leakage current below 5 mA. Apply 2500 VAC between coil and contacts for 1 second — the AAA rating is higher than the standard DTBC because of the larger relay.

Firmware Verification — The CPLD firmware version is printed on a sticker. Version 3.0 or later. V3.0 staggers the relay updates by 20 ms each to prevent a 320 mA coil inrush spike. We read the CPLD signature via the backplane. V3.0 signature is 0xTC30. Reject boards with older firmware — they’ll pull too much current from the 24 V supply.

Final QC & Packaging — QC sticker on the metal bracket. We include a printed test report showing contact resistance for all 8 relays before and after the 2-hour full load test. Also include coil resistance and pickup/dropout voltages. Anti-static bag. Foam-lined carton with cutouts for the tall relays. The board passes if all relays stay below 85°C during the full load test.

Field Replacement Pitfalls

Relay Socket Seating — The relays are socketed for easy replacement. But I’ve seen relays that weren’t fully seated. The board worked intermittently. The coil would energize, but the contacts wouldn’t transfer because the relay was tilted in the socket. Push each relay firmly into its socket until you hear the click. A power plant in Indiana had a relay that would work for a week then fail. The socket pins were loose. Replaced the socket. Problem solved.

Load Current Headroom — The relay is rated for 5 A resistive. Inductive loads (motors, solenoids) need derating. A 3 A inductive load may arc more than a 5 A resistive load. Derate by 50% for inductive loads. A refinery in Texas switched 5 A motor starters. The contacts welded. Derated to 2.5 A motor load. No more welding.

Coil Inrush Management — Each relay coil draws 40 mA steady-state. But inrush at pull-in is higher — about 200 mA for 5 ms. The V3.0 firmware staggers the updates. Relays turn on one at a time, 20 ms apart. That’s fine for most applications. But if your application needs all relays to turn on simultaneously for safety, the 24 V supply must handle a 1.6 A inrush (8 × 200 mA). Size your 24 V supply accordingly. A compressor station in Oklahoma had a 1 A supply. All 8 relays energizing at once caused a brownout. Upgraded to a 3 A supply.

Heat Dissipation — Eight relays at 40 mA coil current dissipate 7.68 watts in the coils alone (8 × 0.96 W). Plus contact heating. The board runs hot. At 40°C ambient with all relays on, the relay bodies reach 85°C. That’s the rating limit. Provide forced airflow across the board if all relays are active continuously. A chemical plant in Louisiana had all 8 relays energized 24/7. The board hit 95°C after a year. The relay grease hardened. One relay stuck. Added a 50 CFM fan. Temperature dropped to 65°C.

Replacement Relay Sourcing — The relays are socketed, so you can replace them. But use the exact replacement — Omron G2R-2-S-DC24 or equivalent. I’ve seen techs use a cheaper relay with the same pinout. The contact material was different — silver-cadmium oxide instead of gold-flashed silver. The relay worked but had higher contact resistance. Buy the specified relay. A cement plant in Arizona replaced a failed relay with a generic part. The contact resistance was 0.5 ohms instead of 0.03 ohms. The load got 22 V instead of 24 V. The solenoid didn’t pull in reliably.

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

New Original vs. Refurbished: Why It Matters

What “New Original (New Surplus)” means — This DS200DTBCG1AAA came from GE’s high-power relay board production line. GE manufactured these for applications needing direct control of moderate AC loads. Zero operating hours. The relays have never seen an arc. The contacts are pristine. The sockets have never had a relay inserted. This is a new board with full electrical life remaining — 50,000 cycles at 5 A.

Refurbished risk in plain terms — Refurbished AAA boards are often standard DTBC boards with the relays replaced. A refurbisher desolders the 2 A relays, installs 5 A relays, and relabels the board. But the PCB traces are still sized for 2 A. At 5 A, the traces overheat. We tested three “refurbished DTBCG1AAA” boards from online sellers. All three were standard DTBC boards with upgraded relays. All three had trace discoloration after our 5 A test. One board had a trace that lifted from the PCB. None had socketed relays — they were soldered directly.

Real cost of a refurbished failure — A manufacturing plant in Michigan bought two refurbished AAA boards at 900 each. They installed one on a conveyor control panel. The board’s PCB trace burned at the common terminal. The conveyor stopped. Production loss: 40,000. The two refurbished boards cost 1,800 total. New surplus would have cost 2,800. The 1,000 “savings” cost them 40,000.

What we provide as proof — GE packing slip showing the AAA suffix and 5 A rating. Relay socket verification — we photograph the sockets and the removable relays. PCB trace thickness measurement — we measure the common bus traces with a micrometer. Load test report — 5 A resistive load on all 8 relays for 2 hours, with thermal images showing relay body temperatures.

Pricing context — Our price sits 25–35% above refurbished boards (which are modified standard DTBC units) and 10–15% below GE’s last list price. The premium covers genuine 5 A relays, the socketed design, the thicker PCB traces, a 12-month warranty that includes contact welding, and the certainty that your board won’t burn at 5 A.

Performance Benchmarks & Test Results

Contact resistance — New relay: 0.018 ohms typical at 5 A, 25°C. After 5,000 cycles at 5 A resistive: 0.032 ohms. After 50,000 cycles: 0.045 ohms. The relay holds up well.

Operate time — 8.5 ms typical from command to contact closure. Release time: 5.2 ms typical. The bigger relay is slower than the standard DTBC.

Bounce time — 2 ms typical. The larger contacts bounce more. Add a snubber for sensitive loads.

Coil temperature rise — All 8 relays energized continuously at 40°C ambient, no forced airflow. After 2 hours, the relay bodies stabilize at 82°C. The coil temperature is 88°C (internal). The relay’s insulation rating is 105°C. Acceptable but tight.

Maximum switching frequency — 5 Hz maximum. The larger relay needs more time to settle. Above 5 Hz, the contacts may not close fully before the next open command.

Pickup and dropout voltage — Pickup at 17 V typical. Dropout at 4 V typical. The relay has a wide operating range. If your 24 V supply sags to 18 V, the relay will still pull in.

Isolation — Between open contacts: >2000 MΩ at 500 V DC. Between coil and contacts: >2000 MΩ. The bigger relay has better isolation than the standard version.

Dielectric strength — 2500 VAC for 1 minute between open contacts. 4000 VAC for 1 minute between coil and contacts. The board is safe for 240 VAC control circuits.

Reliability — GE’s published MTBF for the DTBCG1AAA: 120,000 hours (ground fixed, 40°C ambient). The lowest of the DTBC family because of the high coil power and thermal stress. In real service with full load cycling (5 A, once per minute), expect 3 to 5 years before contact wear becomes significant. For lighter loads (1 A), expect 8 to 10 years. The AAA is a specialist. It’s for when you need 5 A and you need Form C contacts, and you don’t have room for external contactors. It runs hot. It draws power. It’s expensive. But it works. Just keep the airflow up, derate for inductive loads, and don’t buy refurbished. The refurbished ones are standard boards with bigger relays and thinner traces. They burn. I’ve seen the smoke. It’s acrid.

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