Description
Product Introduction & Engineering Value
When an older Indramat drive suddenly loses its power section, replacing the complete drive is not always the practical answer. The 109-0743-3B04-03 provides a board-level spare option for maintaining compatible legacy equipment without unnecessarily disturbing the rest of the drive assembly.
This part is particularly relevant to maintenance teams supporting older Bosch Indramat installations where the original electronics are no longer part of a current production catalog. Cross-referencing the exact suffix matters; supplier records identify 109-0743-3B04-03 specifically as the NT19 power supply board.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bosch Indramat / Bosch Rexroth |
| Part Number | 109-0743-3B04-03 |
| Board Designation | NT19 |
| Product Type | Power supply PCB / circuit board assembly |
| Primary Function | Drive power-supply circuitry |
| Associated System | Indramat drive and spindle-drive equipment |
| Associated Drive Example | RAC3.1-series equipment is listed in Indramat part cross-reference data |
| Mounting | Internal drive electronics assembly |
| Part Status | Legacy / discontinued |
| Country of Origin Listed | Germany |
| Listed Item Weight | Approximately 0.80 kg |
| Listed Shipping Weight | Approximately 3.00 kg |
The NT19 identification and power-supply-board classification are supported by current industrial parts databases. An Indramat component cross-reference also associates the 109-0743-3B04 board family with the RAC3.1-150-460 spindle-drive platform.
Important: Do not treat generic electrical specifications found on reseller pages as authoritative unless they are confirmed against the board’s original Indramat documentation or the nameplate/PCB markings. The available evidence is considerably stronger for the part’s identity and function than for detailed electrical ratings.
Field Application & the “Trench” Experience
A realistic failure scenario looks like this: a machining line running an older Indramat spindle drive develops an intermittent DC-bus or control-power fault. The maintenance team swaps peripheral components first, but the fault remains with the drive electronics. The plant has production scheduled for the next shift, while the original drive manufacturer no longer offers the board as a current production item.
The maintenance engineer checks the failed PCB against the spare and finds 109-0743-3B04-03 / NT19 marked on the replacement. Instead of changing the entire drive cabinet, the team replaces the appropriate board, inspects connectors and wiring, verifies insulation and grounding, and performs controlled commissioning. That is exactly where an obsolete board-level spare earns its place in a maintenance inventory.
Niche Applications
- CNC spindle-drive power electronics on legacy machining centers
- RAC-series spindle-drive systems where continued operation depends on maintaining the original Indramat electronics architecture
- Production machine rebuilds where replacing an entire legacy drive would require unnecessary cabinet modifications or controls requalification
The RAC3.1 association is documented in an Indramat component cross-reference, while the NT19 designation is independently listed for this exact part number.
109-0743-3B04-03
Transparency SOP: QA & Testing
For a legacy PCB such as this, visual inspection alone is not enough. A sensible receiving procedure should include:
- Part-number verification — Confirm
109-0743-3B04-03and the NT19 identification before installation. - Physical inspection — Check the PCB, connectors, solder joints, mounting points, and components for corrosion, impact damage, contamination, or previous repair work.
- Electrical inspection — Verify relevant power and isolation characteristics using controlled test equipment appropriate to the board.
- Functional testing — Where suitable test equipment or a compatible drive test fixture is available, operate the board under controlled conditions before releasing it to production.
- Documentation check — Record the board revision, visible date codes, test results, and condition as part of the spare-parts history.
For new-surplus stock, the term means unused inventory that may have been manufactured years ago; it does not automatically mean recently manufactured. For refurbished stock, refurbishment and test history should be disclosed rather than implied.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Matching only the base number
Do not order solely from 109-0743-3B04. The complete identifier supplied here is 109-0743-3B04-03. Legacy Indramat hardware frequently has revisions and suffixes that can matter during replacement. Confirm the complete board designation and revision markings before purchase.
⚠️ Trap #2 — Assuming “power supply board” means plug-and-play
It isn’t. A replacement PCB does not eliminate the need to inspect the drive’s incoming power, DC-bus condition, grounding, connectors, cooling, and downstream circuitry. If the original board failed because of an external fault, installing another board without correcting the cause can produce another failure.
PRO TIP: Photograph the original board before removal. Capture connector locations, jumper or switch positions, labels, revision markings, and cable routing. On legacy equipment, that five-minute record can save hours during recommissioning.
⚠️ Trap #3 — Confusing obsolete availability with obsolete compatibility
A part being discontinued does not automatically make it incompatible with an installed machine. Conversely, a reseller listing an apparently identical board does not prove compatibility with your exact drive configuration. Verify the drive model, board revision, and original documentation before committing the spare.
Dynamic FAQ
Is 109-0743-3B04-03 an Indramat part?
Yes. Current industrial automation listings identify 109-0743-3B04-03 as a Bosch Indramat part and associate it with the NT19 power supply board.
What is the NT19 board used for?
The NT19 is identified as a power supply board / PC assembly used within legacy Indramat drive equipment. Exact system compatibility should be checked against the drive’s complete model and board documentation.
Is 109-0743-3B04-03 still manufactured?
Available industrial distributor records classify the exact part as discontinued by the manufacturer. Consequently, new-surplus, unused legacy inventory and professionally refurbished units are the more realistic sourcing categories.
Can I substitute another 109-0743 board?
Not without verification. The suffix matters. Compare the complete part number, PCB revision, connectors, electrical characteristics, and the drive application before accepting a substitute.
What does “New Surplus” mean for this part?
New surplus generally means the unit is unused original inventory that has remained in storage rather than being newly manufactured. For an obsolete Indramat board, buyers should request photographs of the actual unit, packaging condition, labels, and date/revision markings where available.
What warranty should I expect?
Warranty terms depend on the supplier and whether the board is new surplus or refurbished. A legitimate quotation should state the warranty period, test status, return conditions, and whether the exact photographed unit is the unit being shipped.
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