BENTLY 125840-01 | High Voltage AC Power Input Module

Description

Product Introduction

A 3500 rack without clean power is a paperweight with a serial number. The Bently 125840-01 is the high-voltage AC power input module for the 3500 machinery protection system — it takes 220V AC at the rack and converts it to regulated DC for the backplane. Every monitor card behind it depends on this module.

What matters with 3500 power modules is the input configuration and rack redundancy setup. The 125840-01 is the high-voltage variant, and pairing it with the wrong input class or running it without a redundant partner changes the reliability calculus. Compare it to the 125840-02 low-voltage variant and the difference is input range, not output. Verify the module revision and rack power configuration against your 3500 documentation before commissioning.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions

Can I swap this module with the rack powered?
No. Kill input power at the breaker, confirm zero voltage at the terminals, then pull the module. Even in a redundant pair, isolate the unit you’re replacing and verify the partner is carrying the load before removal.

How do I confirm the input class matches my rack?
Check the input voltage range on the module label against your rack documentation. The 125840-01 is the high-voltage variant — installing it on a low-voltage feed damages the module and possibly the rack. Verify before you energize.

What does the bench test cover?
Inbound: OEM packing trace, anti-counterfeit verification, visual inspection. Live: power-on self-test, load simulation at rated current for 24+ hours, 3500 rack diagnostics handshake, and insulation resistance above 10MΩ. Units ship with a QC Passed tag and anti-static sealing. Verified functional — not a blanket fail-proof guarantee.

The rack reports a power fault — module or feed?
Check the AC feed stability first, then terminal torque, then total rack draw. A module that faults under load is often sitting at the edge of its rating or fed by a sagging supply. Verify with a meter at the input terminals before condemning the module.

Do I need a redundant partner module?
For continuous-duty machinery protection, yes — most 3500 installations run redundant power modules. Verify your rack configuration and confirm the partner is healthy before swapping either unit.

What’s the lead time on surplus stock?
Usually 2–5 business days after QC release, depending on batch. Ask for the test report and lot trace. For 3500 power modules, documentation and revision match matter more than the price sheet.

What’s the return policy if the revision doesn’t match?
Depends on the seller. Get the window, restocking fee, and exchange-only terms in writing. Most suppliers of surplus Bently modules offer exchange, not refund. Confirm the revision and input class against your rack documentation before ordering.