Installed identity
Match front and rear labels, including the complete rear suffix.
Amikong / Machinery protection field noteFN-3500-33 · 21 OCT 2026
Parts identification / Relay outputs
Bently Nevada 3500/33 relay output selection
Choose the rear module by its complete part number and the load it must switch—not by the “16-channel relay” description alone.
Selection principle
An exact spare starts with the installed rear-card identity. A different rear card is a proposed change until the contact load, configuration and application are reviewed.
01 / Identity
Identify the front and rear components separately.
Baker Hughes lists 149986-01 as the 3500/33 relay control module. The rear output module is a separate part. Photograph both labels and carry the complete identifiers into the purchase request. If a record names only the front module, keep the rear-module identity open until it can be checked.
Front / relay control149986-01Spare 16-channel relay control module
Rear / output149992-0xSelect the exact installed or approved variant below
02 / Contacts
Match the contact version to the actual circuit.
The manufacturer distinguishes standard silver contacts from low-current gold-plated contacts. The stated minimum switched loads are 100 mA at 5 VDC and 1 mA at 1 VDC, respectively. These points are not a complete selection rule; use the relevant application rating and DC selection information in the datasheet.
100 mA · 5 VDCMinimum switched load — standard silver contact
1 mA · 1 VDCMinimum switched load — low-current gold-plated contact
For a PLC or DCS connection, obtain the receiving input specification and circuit drawing. Ask the responsible engineer to determine the voltage and current actually seen at the relay contacts under relevant conditions. A nominal cabinet supply voltage alone does not describe that switched load.
Keep the circuit evidence beside the proposed part number. If suitability remains unclear, request clarification before accepting an alternative. A low-current version is not automatically the right choice just because it sounds more sensitive.
03 / Configuration
Separate hardware choice from output behaviour.
The datasheet permits independent output voting logic. Normally Energized (NE) or Normally De-energized (ND) operation is selected in four groups of four channels. Keep these questions separate from the physical part-number check; the manufacturer also lists software prerequisites.
For replacement work, ask the site team for the approved configuration record and expected output behaviour. Record what must remain unchanged and what is under review. An available alternative should not silently turn an exact-spare order into a configuration change.
Release point. Name the proposed item, supporting documents, unresolved conditions and the person responsible for technical acceptance before the purchase is approved.
04 / Approval
Resolve the application requirements before ordering.
Datasheet Rev. AC separates ordinary-system contact ratings from failsafe and hazardous-area requirements, and includes functional-safety voltage restrictions. Apply the relevant section and approval documents to the exact arrangement; a family-level description is not enough.
Have the responsible reviewer identify required certificates, markings and documentation. If installed records and proposed supply differ, obtain a written decision. In a quotation comparison, use the approved part number, quantity, destination and document requirements as the commercial baseline; keep any substitution visibly separate until approved.
Electrical duty
Review the switched load and relevant rating for the actual circuit.
Approval boundary
Confirm configuration, markings, certificates and technical owner.
05 / Acceptance
Define what receiving and functional checks will cover.
Separate receiving inspection from the site’s functional acceptance. On arrival, compare supplied labels and quantity with the approved purchase record, retain photographs, and resolve discrepancies before installation work begins.
Agree functional test scope and acceptance criteria with the site team in advance. A useful record identifies the equipment tested, configuration, conditions, observed result and reviewer. A generic “tested” statement does not explain which requested work was covered.
01 / IdentifyRecord complete front and rear part numbers.
02 / ReviewConfirm contact load, configuration and approvals.
03 / ReceiveCompare labels and quantity with the approved order.
04 / AcceptUse a site-approved test scope and retained results.
06 / Enquiry
Send a complete, comparable request.
For an exact rear-card enquiry, include the evidence needed to define the item and the quotation scope. Technical approval remains with the responsible site engineer or system integrator.
- Readable front and rear nameplate photographs and full part numbers.
- Requested quantities and exact approved rear-module version.
- Circuit drawing and receiving-device details for load review.
- Approved configuration reference and any proposed changes.
- Required markings, certificates and acceptance documents.
- Destination, required date and clearly stated supply exclusions.
Video
Product presentation.
Product display only. This video does not demonstrate functional testing, technical testing, relay performance or approval for a specific installation.
FAQ
Questions before the purchase release.
Can a budget quotation proceed before engineering approval?
Yes, if it is clearly marked as a budget enquiry rather than a released purchase specification. List open items and hold the final order until technical scope is settled.
How should a shorter lead time affect the decision?
Compare delivery with the site’s required date, including transport, receiving and planned checks. A faster offer for a different rear card remains an alternative requiring review.
How can quotations for different supply conditions be compared?
Ask each bidder to state offered condition, identification evidence, included documents and inspection or test scope. Do not treat a condition label as proof of performance.
Which warranty and return terms should be reviewed?
Obtain the specific offer’s warranty period, start point, remedy, exclusions, claim process and return conditions in writing. Distinguish wrong-item delivery from an unsuitable item ordered to the buyer’s own specification.
Can an urgent order be split into partial deliveries?
Request a line-by-line delivery proposal. Confirm which items the site can use independently and whether extra freight or receiving work changes the total cost.
How much plant information belongs in the enquiry?
Share identifiers and circuit evidence relevant to the requested card through the site’s approved process. Redact unrelated sensitive details without obscuring necessary labels or load information.
