Home > Products > BENTLY > BENTLY NEVADA 3500/33-01-00 – 16?Channel Relay Module for Machinery Protection Outputs
BENTLY NEVADA 3500/33-01-00 – 16?Channel Relay Module for Machinery Protection Outputs
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Product Description
The 3500/33-01-00 is Bently Nevada’s 16?channel relay module designed to translate monitor alarms into hardwired, fail-safe relay outputs for trips, shutdowns, and annunciation. It slots into a 3500 rack and pairs with a rear I/O module, giving you flexible, plant-ready dry contacts without external relay banks. You’ll typically see it used to consolidate alarm logic and drive ESD/PLC interlocks from vibration, temperature, and speed monitors in the same rack.
You might notice it’s sometimes called an “input” module in listings; functionally, this unit is an output relay module. From my experience, that clarity matters when you’re planning wiring and trip logic across a critical machine train.
Key Features16 Form C relay outputs – Dry-contact SPDT outputs for trips, permissives, annunciators, or PLC/ESD inputs.
Configurable logic – Map any rack monitor alarms (e.g., 3500/42, /45, /60) with options for latching/non?latching, time delays, and voting (such as 2oo3).
Fail-safe behavior – Normally?energized or de?energized configurations help meet plant safety philosophies.
Integrated with the rack – Powered via the 3500 backplane; configuration and events handled through the 3500/22M TDI and configuration software.
Front-panel status – Typical OK/BYPASS indicators aid quick diagnostics during commissioning and routine checks.
One-slot footprint – Uses a single rack position with a matching rear I/O module for straightforward field wiring.
Channel grouping – Assign individual or grouped relays to alarms/trips for flexible shutdown strategies.
| Brand / Model | BENTLY NEVADA 3500/33-01-00 (16-Channel Relay Module) |
| Function | Dry-contact relay outputs for machinery protection alarms/trips |
| Power Requirements | Supplied via 3500 rack backplane (no external PSU) |
| Signal I/O Types | 16 × SPDT (Form C) dry-contact relay outputs |
| Communication / Configuration | Via 3500/22M TDI and 3500 Configuration software |
| Rack Position | Occupies one front slot with corresponding rear I/O module |
| Operating Temperature | Typically 0 to +65 °C (rack dependent) |
| Installation Method | Front module + rear I/O terminals; mounted within the 3500 rack |
This module is widely used wherever you need deterministic relay outputs tied to high?integrity monitoring:
Oil & gas and petrochemical units – compressor trains, charge pumps, steam turbines, and expanders.
Power generation – gas and steam turbines, generator auxiliaries, balance-of-plant equipment.
Refining and pipelines – booster pumps, product pumps, and custody transfer support systems.
Heavy industry – paper machines, large fans/blowers, critical gearboxes, and mill drives.
A maintenance lead at a Gulf Coast refinery told me they mapped three independent high?vibration alarms into 2oo3 voting on the 3500/33 to cut nuisance trips by half, while keeping shutdown integrity intact. That seems to be a common pattern for multi?bearing machines.
Reliability – Industrial?grade relay design and fail?safe options align with plant trip philosophies.
Compatibility – Works natively with all 3500 rack monitors; no external logic box needed in most cases.
Cost & wiring efficiency – Reduces separate relay panels and simplifies terminations to DCS/PLC/ESD.
Serviceability – Clear status indication, modular replacement, and configuration via familiar 3500 tools.
Long lifecycle support – Stable platform with a large installed base and proven spares strategy.
Cabinet/Rack – Mount in a standard 3500 rack within a well?ventilated enclosure. Keep ambient within the rack’s specified range and avoid direct heat sources.
Wiring – Use the rear I/O terminals; segregate trip circuits from low?level signals. Clearly label common, NO, and NC contacts. Observe site standards for ESD/PLC input wiring.
Grounding – Follow rack grounding practices to minimize interference and ensure safe fault clearing.
Configuration – Set latching, time delays, and voting in the 3500 configuration software. Verify each relay with a functional test before placing the machine on risk.
Routine checks – Periodically proof?test relays, confirm contact operation, and review event logs. Firmware and configuration should be managed via the 3500/22M TDI under MOC procedures.
Conformity: CE and UL/cUL for the 3500 system; hazardous area approvals (e.g., ATEX/IECEx) available by specific option codes.
Manufacturing: Built under ISO 9001 quality systems.
Environmental: RoHS alignment on many variants; confirm per part number and site requirement.
Warranty: Manufacturer’s standard warranty (commonly 1 year); extended coverage often available.
If you’re replacing legacy trip relays or standardizing across multiple racks, the 3500/33-01-00 typically gives a neat balance of channel density and configuration flexibility without complicating the shutdown architecture.
Company Profile
Xiamen Xiongba E-commerce Co., Ltd. is a control system component company, located in Siming District, Xiamen, a beautiful coastal city. Xiamen Xiongba E-commerce Co., Ltd. is one of the largest control system components in China, focusing on industrial automation PLC and DCS modules. Our company has 20 years of experience in the field of automatic control. We specialize in supplying world-renowned brands: Allen Bradley, ABB, General Electric, Triconex, Honeywell, Bentley Nevada, Schneider, Hima, and even some...
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Bently Nevada 3500/25-02-01-00 Keyphasor Module – Phase and Speed Reference for Centrifugal Compressors
Bently Nevada 3500/60-01-00 Temperature Monitor – Reliable Multi-channel RTD Monitoring for the 3500 Protection System
Bently Nevada 330130-085-00-00 Extension Cable for 3300 XL Proximity Transducers
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Bently Nevada 330130-080-00-05 – 3300 XL Proximity Extension Cable for Vibration Monitoring
Bently Nevada 3500/15-05-05-CN Power Supply Module – Stable Rack Power for the 3500 Machinery Protection System





BENTLY NEVADA 330180-51-05 Proximitor Sensor – Reliable 5 mm Shaft Vibration and Position Measurement
Bently Nevada 330101-00-20-10-02-05 Proximity Probe for Vibration and Shaft Displacement
Bently Nevada 3500/32-01-01 Relay Module – Discrete Shutdown and Annunciation for the 3500 Machinery Protection Rack
Bently Nevada 330105-02-12-90-12-CN – Proximity Probe for Critical Vibration and Shaft Position Monitoring
Bently Nevada 330106-05-30-90-12-CN Proximity Probe for Non?contact Vibration & Shaft Displacement Monitoring
Bently Nevada 330105-02-12-10-02-05 Proximity Probe – Non-contact Vibration and Shaft Displacement for Critical Rotating Assets
Bently Nevada 3500/40-01-01 Proximitor Monitor – 4?Channel Radial Vibration Card for Critical Rotating Machinery
Bently Nevada 330130-045-02-05 Extension Cable – Reliable Interconnect for 3300 XL Proximity Systems
Bently Nevada 3500/44-XX-01 Vibration Monitor – 4?Channel Machine Protection for Critical Rotating Assets
Bently Nevada 330106-05-30-05-02-05 Vibration/Displacement Probe for Critical Rotating Machinery
Bently Nevada 330130-045-01-05 Extension Cable – Reliable Link for 3300 XL Proximity Probe Systems
Bently Nevada 990-08-XX-01-CN Vibration Transmitter (P/N 283278-01) – 4–20 mA Machine Condition Signal for DCS/PLC
Bently Nevada 330130-080-13-CN – 3300 XL Extension Cable for Proximity Transducer Systems
Bently Nevada RRE004382 Vibration Probe for Centrifugal Compressors – Non?contact Shaft Vibration Sensing
Bently Nevada 330101-37-57-10-02-05 – Proximity Probe for Vibration and Shaft Displacement Monitoring
Bently Nevada 3500/92-03-01-00 Communications Gateway Module – Reliable Modbus Bridge for 3500 Machinery Protection Racks
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Bently Nevada 3500/15-04-04-01 Power Supply Module – Stable DC Power for 3500 Machinery Protection Racks
Bently Nevada 3500/25-01 Keyphasor Module – Stable Phase Reference for Rotating Machinery Diagnostics and Balancing
Bently Nevada 330101-00-58-10-02-05 – Proximity Sensor for Vibration and Shaft Displacement Monitoring
Bently Nevada 3500/05-01-01-01-00-00 System Rack – The Backbone of the 3500 Monitoring & Protection Platform
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