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Product Overview
The Bently Nevada 3500/32 with I/O module 125720-01 is a four-channel relay module for the Bently Nevada 3500 Machinery Health Protection System. It provides configurable dry-contact relay outputs that can be driven by alarm, danger, Not-OK or other status signals from any monitor module in the same rack.3
The part number 125720-01 refers to the associated 4-channel relay I/O module, which provides the physical relay terminals for external wiring. The 3500/32 relay module itself is the main processing module installed in the front slot, while 125720-01 serves as the rear I/O termination board.46
Each relay output can be independently programmed through the 3500 rack configuration software using AND/OR logic, allowing flexible integration with DCS, ESD, PLC or direct trip circuits. The module supports both de-energized and energized relay operation, making it suitable for fail-safe protection applications.48
Key Features
- 4 independent relay outputs
Each channel provides a configurable dry-contact relay output for external alarm or trip circuits. - Flexible alarm logic programming
Each relay can be driven by any monitor channel or combination of channels in the rack using AND/OR logic.48 - Configurable energized/de-energized operation
Supports both normally energized and normally de-energized relay modes for fail-safe applications. - SPDT relay contacts
Each channel uses single-pole double-throw (SPDT) relay contacts, configurable for NO/NC operation.610 - Front-panel LED indicators
OK, TX/RX and CH ALARM LEDs provide quick status monitoring. - Hot-swappable design
Supports hot-swappable maintenance in a properly configured 3500 rack.3 - API 670 compliant
Designed for machinery protection applications in compliance with API 670 standards.3
Typical Applications
- Turbine and compressor trip circuits
- High vibration alarm and shutdown
- Axial position protection
- DCS/PLC/ESD interface signals
- Auxiliary alarm indication
- Critical rotating equipment protection in power, oil & gas and petrochemical plants
Technical Specifications
| Item | Detail |
|---|
| Item | Detail |
|---|---|
| Product Name | Bently Nevada 3500/32 Relay Module |
| Associated I/O Module | 125720-01 |
| Module Type | 3500/32 4-Channel Relay Module |
| Series | Bently Nevada 3500 Machinery Health Protection System |
| Relay Channels | 4 independent channels |
| Relay Type | SPDT (Form C) dry contacts |
| Contact Rating | 5 A @ 30 VDC / 120 VAC (resistive load) |
| Electrical Life | 100,000 operations @ 5 A |
| Typical Power Consumption | Approx. 5.8–6 W |
| Operating Temperature | -30°C to +65°C |
| Brand | Bently Nevada |
| Origin | USA |
| Condition | New / Surplus / Refurbished, depending on stock |
⚠️ Note: The exact relay configuration, logic programming, contact rating and certification should be confirmed by the actual nameplate or official datasheet before ordering.
Why Choose This Module
- Provides 4 independent dry-contact relay outputs for alarm and trip
- Supports flexible AND/OR logic programming across any monitor channel
- Compatible with fail-safe energized/de-energized operation
- Fits into existing Bently Nevada 3500 rack systems
- Suitable for DCS/PLC/ESD integration and direct trip circuits
- Suitable for global spare parts procurement and replacement projects
FAQ
What is Bently Nevada 3500/32 125720-01?
It is a 3500/32 4-channel relay module with the associated I/O module 125720-01, used to provide configurable relay outputs for alarm and trip applications in the Bently Nevada 3500 system.
What is the difference between 3500/32 and 3500/40M/42M?
The 3500/32 is a relay output module that does not accept sensor inputs directly. It receives alarm signals from monitor modules (such as 3500/40M, 3500/42M) and drives external relay contacts. The 3500/40M and 3500/42M are monitor modules that process sensor signals.3
What is 125720-01?
125720-01 is the 4-channel relay I/O module (termination board) that provides the physical relay terminals for external wiring. It works together with the 3500/32 main relay module.46
Can the relay logic be customized?
Yes, each relay can be independently programmed using AND/OR logic through the 3500 rack configuration software, based on any monitor channel or combination of channels in the rack.48
Which industries use this module?
It is widely used in power generation, oil & gas, petrochemical, steel and heavy manufacturing for rotating equipment protection and trip circuit integration.
3500/32 125720-01
BENTLY BRAND
| 125760-01 | 133396-01 | 3500/54M |
| 125768-01 | 133819-02 | 3500/60 163179-01 |
| 125800-01 | 135473-01 | 3500/61 |
| 125840-01 | 135613-01-00 | 3500/61-01-01 |
| 2300/20-00 | 3500/64M | 3500/62-03-00 |
Recommended other models
Bently Nevada 3500/33 149986-01 16-Channel Relay Module
Bently Nevada 3500/34 125696-01 Triple Modular Redundant Relay Module
Supplies industrial spare parts covering well‑known international brands: ABB, GE, Bently Nevada, Emerson, Honeywell, Schneider, EPRO, Yokogawa, Woodward, Foxboro and Invensys TRICONEX.
We maintain ample stock, offer fast lead times and deliver products with stable, reliable quality.
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