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Help CenterBently Nevada 125696-01 4-Channel Relay Module – Trusted Alarm and Trip Outputs for 3500 Machinery Protection Racks
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- Warranty: 365 days
- Delivery: 1 week if in stock; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express options: FedEx, UPS, DHL
Four independent relay outputs – Each channel provides a dry-contact output for alarm, trip, or interlock signaling.
Configurable contact behavior – SPDT (Form C) contacts; typically configurable as normally energized/de-energized and NO/NC to fit site standards.
Alarm logic and voting – Supports common logic (e.g., OR/AND groupings) so you can implement simple voting schemes without extra hardware.
Latching or non-latching – Set per application; many plants prefer latching trips with manual reset for audits and safety workflows.
Rack-powered – No external power supply; the module draws from the 3500 backplane for tidy cabinet layouts.
Status indication – Clear front-module status makes commissioning faster and troubleshooting more straightforward.
Single-slot footprint – Saves space and simplifies I/O assignment in dense racks.
Designed for industrial environments – Works reliably in control room conditions with stable performance over time.
| Brand / Model | Bently Nevada 125696-01 (4-Channel Relay Module for 3500) |
| HS Code | 8537.10 – Boards/panels for electric control (≤1000 V) |
| System Compatibility | Bently Nevada 3500 rack system |
| Power Requirements | Powered via 3500 backplane; no external supply required |
| Channels | 4 relay outputs, SPDT (Form C), dry contacts |
| Signal I/O Types | Dry-contact relay outputs for alarms/trips; field wiring via rear I/O terminals |
| Communication Interfaces | Configuration through the rack; no dedicated fieldbus on the module |
| Operating Temperature | Typically 0 to +65°C (control room environment) |
| Installation Method | Single-slot plug-in module; rear I/O with screw terminals on the rack’s I/O module |
| Dimensions & Weight | Standard 3500 single-slot form factor; typical weight under 1 kg |
Bently Nevada 3500/05 System Rack – The chassis for housing monitor and relay modules; choose slot count according to channel density.
Bently Nevada 3500/15 Power Supply – Reliable rack power; many sites keep a spare for uptime assurance.
Bently Nevada 3500/22M TDI – Typically used for rack configuration and data interface to software; streamlines setup and diagnostics.
Bently Nevada 3500/92 Communications Gateway – Modbus communications to DCS/PLC for system-level integration when needed.
One thing I appreciate is how cleanly the 4-channel relay module ties into these standard rack elements—wiring stays organized and future expansions remain straightforward.
Common in machinery protection and plant safety where deterministic alarm outputs are required:
Steam and gas turbines – trip relays linked to vibration/overspeed alarms.
Compressors, pumps, and fans – start-permissive and shutdown logic to prevent damage.
Refining and petrochemical units – interlocks to ESD/SIS for equipment protection.
Power generation and paper mills – annunciation to DCS/PLC for operator awareness.
In many cases, plants map two channels to alarms and two to trips, with simple voting to reduce spurious trips during transient conditions.
Advantages & ValueReliability – Proven module architecture designed for continuous operation in critical control environments.
Compatibility – Seamless with the 3500 ecosystem; no surprises on wiring or configuration.
Cost Efficiency – Consolidates multiple alarm functions into one single-slot module; helps standardize spares.
Configuration Flexibility – Voting, latching, and contact-state options let you match site standards without extra hardware.
Support – Easier commissioning and maintenance with standard rack tools and clear status indications.
Panel/Cabinet – Install in a clean, ventilated control cabinet; follow standard 3500 rack mounting and grounding practices.
Wiring – Use the rear I/O terminals; maintain separation from high-voltage conductors and label alarm/trip circuits clearly.
Contact Ratings – Use as dry-contact signal interfaces into DCS/ESD input cards; drive higher loads via interposing relays if required.
Configuration – Set channel assignment, latching, and voting using the standard 3500 rack configuration tool; document setpoints and logic.
Safety – De-energize circuits when landing wires; verify function with loop checks. You might notice that a proof-test schedule reduces surprises later.
Routine Maintenance – Periodic functional tests of each relay output, inspection of terminal tightness, and cleaning of the front panel and ventilation paths.
CE and UL/cUL compliance (industrial control equipment)
RoHS compliant in most configurations
Manufacturer warranty policies apply; sales warranty from us: 365 days
If you’re standardizing a 3500 rack or replacing legacy relay cards, this module seems to be the safest drop-in path—minimal rework, predictable behavior, and clean integration to your control system.
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