TL;DR: The Bently Nevada 3300/12 belongs to the 3300 series, the rack-based machinery protection family that the 3500 system replaced. Independent distributor listings consistently identify the /12 as a 3300 series AC power supply – nominally 110/220 VAC – and associate it with board assembly 88219-01 and assemblies 78591-01A and 89931-01. Here is the honest part: Baker Hughes no longer publishes 3300 series module datasheets on its public site, so ordering sub-code meanings, terminal details and rated outputs cannot be verified from official documentation. If your machine still runs a 3300 rack, we can help you source or verify a /12 – and we will also tell you straight whether keeping that rack alive is cheaper than migrating to a 3500 system.
What is the 3300/12?
The 3300 series was Bently Nevada’s rack-mounted monitoring platform before the 3500. It used the same architectural idea you see in the 3500 – a rack with a backplane, plug-in modules, and a dedicated power supply module per rack – with different module numbering. Within that family, the /10 and /12 positions are identified across independent distributor sources as the AC power supplies, and the /14 as the DC supply.
That identification is consistent, but it is not official. Bently Nevada’s current public product tree lists 3500, ADAPT, Orbit 60, Trendmaster and Orbit DCM. There is no 3300 series rack page, and 3300 series module documentation has moved behind the Bently Nevada Media Library login at bntechsupport.com. Anything we say about the /12 that is not on a document we can show you, we label as unverified – because a wrong assumption about a power supply is how a rack gets damaged.
What is verifiable, and what is not
| 3300 series, rack platform | Verified as a legacy family; the 3500 is the current generation |
|---|---|
| /12 = AC power supply | Consistent across multiple independent distributor sources; no public official datasheet |
| Nominal 110 / 220 VAC input | Distributor-sourced; treat as indicative, confirm against the module label |
| Board assembly 88219-01 | Distributor-sourced; not confirmable from public Baker Hughes documents |
| Meaning of each position in 3300/12-01-20-00 | NOT VERIFIABLE from official public documentation |
| Rated DC bus outputs, current capacity | NOT VERIFIABLE publicly |
| Slot position and mechanical fit | NOT VERIFIABLE publicly; 3300 racks are commonly described with 12 or 14 module positions |
| Hazardous-area certification | NOT VERIFIABLE publicly for this part |
| Official 3300-to-3500 retrofit guide | Does not exist in public form – see the migration section below |
We would rather show you that table than pad the page with numbers we cannot stand behind. If you have the module, the label settles the input rating question in seconds, and we will match against it.
Ordering the 3300/12
3300 series modules were ordered in a dotted code of the form 3300/12-AA-BB-CC. The one we hold is 3300/12-01-20-00. The individual position meanings are not published in any document we can cite, so the only safe way to order a replacement is by the complete code on your existing module – not by description, and not by the position that “sounds right”.
Two specific warnings from our own experience with legacy inventory:
| Do not mix generations | A 3300 series supply will not power a 3500 rack, and the reverse is also true. 3500 rack power is the 3500/15, a half-height module with its own Power Input Module |
|---|---|
| Ignore copied specification text | Some legacy listings – including one of our own historical entries – carry relay wording such as “single-pole, double-throw (SPDT)” against 3300 power supply part numbers. That phrase comes from 3500 relay module specifications and does not describe a power supply |
3300/12 parts we can supply
Part number
| 3300/12-01-20-00 | 3300/12-01-20-00 Single-pole, double-throw (SPDT) · In stock · View |
|---|
Should you repair a 3300 rack or migrate to 3500?
For most sites the answer has changed in the last few years, because the 3500 is not being phased out. Baker Hughes stated in its commitment notice that “the 3500-product line remains fully supported, even as it passes its 24th birthday”, explicitly rejecting a forced-obsolescence programme, and refreshed the electronics through 2016-2017 to meet RoHS. New installations post-2020 are pointed at Orbit 60 where suitable, but the 3500 stays in production with current documentation. Practically that means:
| Keep the 3300 rack | Only if you can source power supplies and modules reliably and the protection philosophy has not changed. Spares are dealer-supplied and unverified |
|---|---|
| Move to 3500 | Documented, supported, API 670-compliant designs, SIL 1 and SIL 2 certified from sensor to relay, current parts available new |
| Move to Orbit 60 | Where a new installation or a full rewire is already planned; 3U form factor, fully electrically hot-swappable modules, higher spectral resolution |
What does exist officially, and is often mistaken for a migration path, is sensor continuity rather than rack continuity: 3500 monitors such as the /40M and /45 are documented to accept input from the Bently Nevada 3300 XL Proximitor transducer series. The 3300 XL name covers the proximity sensor family – probes, extension cables and Proximitor preamplifiers, e.g. 330101, 330130, 330180 – which is alive and current, and is unrelated to the legacy 3300 series rack modules like the /12. If your inquiry is about sensors, you are looking for the 3300 XL sensor pages, not this one.
There is no public official module-by-module 3300-to-3500 substitution table; that mapping is done with Bently Nevada Customer Care against your rack drawing, and we will help you prepare it.
Frequently asked questions
What is a Bently Nevada 3300/12?
It is a power supply module from the legacy 3300 series rack monitoring platform, the family that preceded the 3500 system. Independent distributor sources consistently list the /12 as the 3300 series AC power supply at nominal 110/220 VAC. Baker Hughes does not publish a public datasheet for it any more, so we verify against the label on your module rather than against a summary table.
Is the 3300/12 a relay module?
No. Some listings describe it with relay language such as “single-pole, double-throw (SPDT)”, but that phrase belongs to 3500 relay modules – the 3500/32M datasheet defines SPDT relays for that part. The /12 is a power supply within the 3300 family. If you have been asked for an SPDT module, that request is almost certainly about a 3500/32M or 3500/33.
Is the Bently Nevada 3300 series discontinued?
There is no public discontinuation notice for 3300 series rack modules, which is not the same as saying they are available. The practical evidence is that 3300 rack documentation has moved behind the Bently Nevada Media Library login and the current public product tree lists only 3500, ADAPT, Orbit 60, Trendmaster and Orbit DCM. Supply is through legacy and dealer stock.
What does 3300/12-01-20-00 mean?
It is a 3300 series module ordered in the dotted-code format, where the /12 position identifies the module type and the trailing pairs are option positions. The specific meaning of the 01, 20 and 00 options is not documented in any public official source we can cite, so order replacements by copying the entire code from the module you are replacing.
Can a 3300/12 replace a 3500/15?
No, in either direction. They belong to different rack generations with different backplanes and different power architectures. A 3500 rack takes the half-height 3500/15 supply plus its rear Power Input Module, and up to two of them for redundancy. A 3300 rack takes 3300 series supplies.
My 3300 rack lost power. Should I buy another /12?
Buy it only after you have established that the rack itself is worth keeping. A 3300 series power supply is an unverified, dealer-stock purchase, and if the rack needs several of these over its remaining life the money usually goes further in a documented 3500 rack. Send us the module list and the machine, and we will give you that comparison honestly – including when the answer is “keep the 3300 and we will find you the supply”.
Do 3300 XL sensors still work with modern monitors?
Yes, and this is the one 3300-related fact that is fully official: 3500 series monitors including the /40M and /45 accept input from the Bently Nevada 3300 XL series of Proximitor transducers. The 3300 XL proximity sensors are a current, documented product family with published datasheets. The legacy 3300 series rack modules such as the /12 are a different thing that happens to share the number.
Can you test a 3300/12 before shipping?
We inspect against the label, check for physical and connector damage, and confirm the code matches what you specified. We cannot benchmark a legacy supply against a published official test procedure that is no longer public, and we will not claim that we can. What we can do is tell you which parts of the specification we verified and which we could not.
Ask us about a 3300/12
Send a photo of the module label and, if you have it, the rack module list. We will confirm whether we can supply the part, what we can actually verify about it, and – if you want to hear it – what a 3500 replacement would cost you in rework. Prices are quoted per enquiry and are never published on this site.
Related: 3500/15 power supply and the 3500 machinery protection system complete guide.