Bently Nevada 3500/15 125840-02 Low Voltage AC Power Input Module

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Bently Nevada 125840-02 is the low‑voltage AC power input module for the 3500/15 power assembly within the 3500 machinery protection rack system, manufactured by Bently Nevada, a Baker Hughes company. This half‑height input card mates with the main 3500/15 power supply and serves as the front‑end AC feed interface for the TSI rack, accepting site AC mains and feeding regulated power into the rack backplane for all monitoring, communication and relay modules. It is a dedicated companion piece rather than an independent power converter and must be paired with the corresponding 3500/15 power supply core to function correctly.

This 125840‑02 variant covers the 85–132 VAC input range at 47–63 Hz, the standard low‑voltage AC configuration for global industrial cabinets. Multiple power combinations are supported inside one 3500 chassis; users can fit two power input modules and two power supplies to build fully redundant N+1 power architecture. Hot‑swap capability is retained for the complete power assembly: with a redundant unit online, technicians can replace one input module without shutting down the entire machinery protection rack, avoiding machine trips and unplanned production loss.

Built‑in fusing and surge suppression protect against input transients, overcurrent and short‑circuit events on the AC line side. The module routes raw AC power to the main power supply unit, which then generates the internal DC rails used by the 3500 rack. It works seamlessly alongside the 3500/20 RIM, vibration monitors, keyphasor cards, relay output modules and backplanes. It carries status signals back to the rack diagnostics so that power feed faults can be captured in the system event log for condition monitoring and planned maintenance.

Key Features

• Low voltage AC input module for Bently Nevada 3500/15 power system
• Accepts 85–132 VAC, 47–63 Hz industrial mains supply
• Half‑height form factor, designed for dedicated power slot on the left side of 3500 rack
• Supports dual redundant power setup for high‑availability TSI protection systems
• Hot‑swappable when redundant power is configured
• Integrated replaceable fuse and inrush surge protection
• Transmits power status and fault signals to rack diagnostic system
• Designed to work together with matching 3500/15 power supply core
• Rugged metal construction for control cabinet installation
• Fully compatible with the complete Bently Nevada 3500 series machinery protection rack

Technical Specifications

• Part Number: 125840-02
• Brand: Bently Nevada (Baker Hughes)
• Module Type: Low Voltage AC Power Input Module
• Associated Family: 3500/15 power assembly
• Input Range: 85 VAC to 132 VAC
• Frequency: 47 Hz – 63 Hz
• Max Input Current: 4 A
• Form Factor: Half‑height rack module
• Installation: Dedicated power slot on left of 3500 chassis
• Cooling: Convection cooling
• Operating Temperature: 0°C to +60°C
• Relative Humidity: Up to 95%, non‑condensing
• Weight: Approximately 0.32 kg
• Termination: Screw terminal block for field AC wiring
• Compatibility: All standard 3500 rack backplanes and 3500/15 power supply cores

Common Applications

The 125840‑02 AC power input module is widely deployed in turbine supervisory instrumentation and machinery protection systems for steam turbines, gas turbines, centrifugal compressors, process pumps, blowers and large critical rotating assets. Typical installations include thermal power plants, combined‑cycle facilities, oil refineries, LNG terminals, offshore platforms and chemical plants. It is a high‑demand spare for maintenance, rack retrofits, system expansion and emergency replacement when the original AC input interface fails.

Our Supply Information

We supply original Bently Nevada 125840‑02 low voltage AC power input modules. Each unit undergoes visual and functional inspection before shipment. We also stock the matching 3500/15 power supply cores, 3500/20 RIM modules, vibration monitors, keyphasor cards, relay modules, backplanes and interconnect cables for the full 3500 series. International shipping via DHL, FedEx and UPS is available. We can provide commercial invoices, packing lists, COO and other standard export documents for automation spare part orders.

Contact our sales team if you need datasheets, revision confirmation, compatibility cross‑check, lead time, unit price or bulk quotation for 125840‑02. We can also verify whether this low‑voltage AC variant matches your existing 3500/15 power configuration.

125840-02

BENTLY BRAND

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