Bently Nevada 3500/32 125712-01 Relay Module

Technical Specifications

Parameter	Details
Product Type	4-Channel Relay Output Module
Compatibility	Bently Nevada 3500 Series Monitoring System
Number of Channels	4 independent relay outputs
Contact Configuration	Form C (SPDT) per channel
Contact Rating	5 A at 250 VAC / 30 VDC (resistive)
Contact Material	Silver alloy with gold plating
Response Time	30 ms typical (alarm to contact transfer)
Alarm Logic	User-configurable (danger, warning, alert)
Voting Options	1-out-of-1, 1-out-of-2, 2-out-of-2, 2-out-of-3
Latching Mode	Selectable (latching or non-latching)
Time Delay	0 s to 60 s (adjustable per channel)
Communication Protocol	Modbus RTU, Modbus TCP/IP
Dimensions (H x W x D)	241 mm x 38 mm x 254 mm
Weight	1.1 kg
Power Supply	24 VDC nominal (18 VDC to 32 VDC)
Power Consumption	6.0 W typical
Operating Temperature	–20 °C to +65 °C
Storage Temperature	–40 °C to +85 °C
Protection Class	IP20
Certifications	CE, CSA, ATEX, ABS

Versatile Relay Output Configuration

The 3500/32 125712-01 4-channel relay module provides a flexible interface between the 3500 monitoring system and external actuators. This unit features four independent form C relays, each capable of driving contactors, solenoid valves, or alarm horns. Users can configure each channel for specific voting logic, including 1-out-of-1, 1-out-of-2, 2-out-of-2, and 2-out-of-3 schemes. Such versatility enables the module to handle everything from simple machine alerts to critical emergency shutdown sequences.

Reliable Contact Performance

Each relay on the 3500/32 125712-01 carries a robust contact rating of 5 A at 250 VAC or 30 VDC, ensuring compatibility with diverse field devices. The gold-plated silver alloy contacts resist corrosion and maintain stable electrical characteristics over thousands of switching cycles. Response times measure only 30 ms from alarm detection to contact change, providing prompt protection during developing fault conditions. Operators can also set adjustable time delays from 0 to 60 seconds per channel to suppress nuisance trips.

Advanced Alarm Management

The 3500/32 125712-01 supports both latching and non-latching relay behavior, adapting to different operational requirements. In latching mode, relays maintain their state after an alarm clears and require manual reset, ensuring operator awareness of past events. Conversely, non-latching relays automatically return to their normal state once conditions normalize. A dedicated health relay indicates module status, enabling remote diagnostics and proactive maintenance planning.

System Integration and Mechanical Design

Weighing 1.1 kg and occupying a single half-height slot (38 mm wide), the 3500/32 125712-01 fits efficiently into the 3500 rack. The module consumes only 6.0 W from a nominal 24 VDC supply, minimizing heat generation inside control cabinets. It communicates seamlessly via Modbus RTU and TCP/IP for integration with DCS, PLC, and SCADA platforms. Its IP20-rated housing provides adequate protection for standard industrial control room environments.