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The 3500/42M (Part Number 125720-01) is a high-density relay interface module developed for the Bently Nevada 3500 Machinery Protection System. This module provides four independent relay output channels, delivering reliable switching functions...
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The 3500/42M (Part Number 125720-01) is a high-density relay interface module developed for the Bently Nevada 3500 Machinery Protection System. This module provides four independent relay output channels, delivering reliable switching functions for alarm and trip logic in critical rotating machinery protection applications.
Designed for flexible installation, the module occupies a full-width slot in any position to the right of the Rack Interface Module (RIM) within the 3500 rack. Each of the four integrated relays is fully programmable, enabling engineers to configure custom voting logic required for advanced machine protection and shutdown strategies.
The internal termination design simplifies field wiring by eliminating the need for external terminal blocks, reducing panel wiring complexity while maintaining strong signal integrity and system reliability in demanding industrial environments.
| Parameter | Specification |
|---|---|
| Model Number | 3500/42M |
| Part Number | 125720-01 |
| Product Type | 4-Channel Relay I/O Module |
| Output Configuration | 4 independent relay outputs |
| Termination Type | Internal Terminations |
| Operating Temperature | -30°C to +65°C |
| Dimensions | 241 mm (H) × 24.4 mm (W) × 99.1 mm (D) |
| Weight | 0.4 kg |
The 3500/42M 125720-01 module plays a critical role within the 3500 system architecture, providing relay outputs used to trigger external shutdown systems, alarms, or PLC/DCS inputs.
It is commonly installed in protection systems for steam turbines, centrifugal compressors, and large industrial motors, where high-speed relay logic and dependable shutdown signaling are essential for maintaining operational safety and equipment integrity. The module supports complex safety logic and integrates seamlessly with other 3500 monitoring modules to provide comprehensive machinery protection.
Does the 125720-01 require a separate I/O module for logic processing?
No. The 125720-01 functions as the relay output interface within the 3500 rack and operates based on alarm setpoints and logic configured through the 3500 system software.
Can these modules be used with external terminal blocks?
This specific model is designed with internal terminations for direct wiring. Users who require external field wiring blocks should select the external-termination variant designed for that configuration.
