3500/33 - Relay Module

3500/33 - Relay Module 3500/33 - Relay Module

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Part Number: 3500/33
Manufacturer: Bently Nevada
Series: 3500
Product Type: 16-Channel Relay Module
Power Consumption: 5.8 watts typical
Dimensions: 241 mm x 24.4 mm x 242 mm
Weight: 0.7 kg (1.6 lb)
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

3500/33 is a 16-Channel Relay Module developed by Bently Nevada. A full-height module with 16 relay outputs, the 16-Channel Relay Module. Any of the slots to the right of the Transient Data Interface (TDI) Module can accommodate any quantity of 16-channel relay modules. Voting logic can be individually programmed into each output of the 16-Channel Relay Module. Alarm Drive Logic is a component of each relay in the module. The 3500 Rack Configuration Software can be used to program the Alarm Drive. The following are examples of possible programming for the Alarm Drive Logic using AND and OR logic:

  • Alarming sources (alert and danger statuses)
  • Not-OK
  • Variables that have been individually measured from any monitor channel or set of monitor channels in the rack

Product Attributes

  • LEDs on the Front Panel: The presence of LEDs on the module's front panel is a fundamental feature that provides valuable visual feedback. These LEDs serve as informative indicators, aiding users in quickly assessing the module's status and operational condition. This visual interface simplifies monitoring, contributing to efficient system management.
  • Alarm Control Logic: The module's incorporation of alarm control logic is a key aspect that enhances its role in maintaining system integrity. This logic allows the module to respond intelligently to varying conditions by triggering appropriate actions based on predefined criteria. This feature empowers users to proactively address potential issues, contributing to the overall reliability of the system.
  • Low Average Power Consumption: With an average power consumption of 5.8 watts, the module demonstrates an emphasis on efficiency and energy-conscious design. This low power consumption is significant in applications where energy efficiency is a priority, helping to reduce operational costs and environmental impact.
  • Epoxy-Sealed Construction: The epoxy-sealed construction of the module underscores its robustness and resilience. This protective encapsulation shields internal components from environmental factors such as m isture, dust, and contaminants, thereby extending the module's operational lifespan and enhancing its durability.
  • Double-Throw Single-Pole (SPDT): The double-throw single-pole (SPDT) configuration of the module's relay outputs amplifies its versatility. This design allows for connections to be made to one of two output terminals, expanding the range of potential applications and increasing flexibility in system design.
  • Standard 250 Vrms Rating: The inclusion of a standard 250 Vrms rating for the module speaks to its compatibility with a range of voltage levels. This attribute ensures that the module can be effectively integrated into various systems without concerns about voltage compatibility.
  • High Relay Contact Cycles: With the ability to handle 100,000 relay contact cycles, the module exhibits impressive durability and longevity. This high cycle capacity contributes to extended operational lifespans, reducing the need for frequent replacements and maintenance.

Input Specification

  • 5.8 watts is the average input power consumption.

Output Specification

  • Front Panel LEDs: The 16-Channel Relay Module's OK LED will light up when it is functioning properly.
  • When the 16-Channel Relay Module is in communication with other modules in the 3500 rack, the TX/RX LED, which stands for transmitting and receive, flashes.
  • When the relay channel is in an alarm condition, the CH Alarm LED is illuminated.

Relay Operation

Normally Deenergized (ND) or Normally Energized (NE) operation is switch selectable for four groups of four channels.

Rack Space Requirements

  • Full-Height Front Slot in Main Module: This slot accommodates the primary interface of the Relay Module within the main module rack. Proper placement ensures optimal functionality and accessibility.
  • Full-Height Rear Slot for I/O Modules: To facilitate communication and interaction with other components in your system, a full-height rear slot is allocated for I/O Modules. This integration enhances the module's capabilities and connectivity.


  • The 3500 Rack Config, version 3.3 or later, is required for the 16-Channel Relay Module.
  • The Data Acquisition Software, version 2.40 or later, is required for the 16-Channel Relay Module.
  • The 3500 Data Display Software, version 1.40 or later, is required for the 16-Channel Relay Module.
  • If the 16-Channel Relay Module is part of the functional safety (SIL) system, the restricted voltage is required by the functional safety certificate. For functional safety (SIL) systems, higher voltages are not permitted.

Outputs - Front Panel LEDs

  • OK LED: The presence of the OK LED on the front panel serves as a key indicator of the 16-Channel Relay Module's operational status. This LED is designed to illuminate when the module is functioning correctly, providing an instant visual confirmation of proper operation. This immediate feedback enhances operational transparency, allowing users to quickly ascertain the module's health during regular monitoring or troubleshooting activities.
  • TX/RX LED: The TX/RX LED on the front panel serves as a dynamic indicator of communication activity. This LED responds by flashing when the 16-Channel Relay Module establishes communication with other modules within the 3500 rack. The transmit and receive flashes provide visual reassurance that the module is actively engaged in data exchange, contributing to the seamless communication and coordination of the overall system.
  • CH Alarm LED: The inclusion of the CH Alarm LED addresses the critical aspect of alarm conditions. This LED is strategically placed to illuminate when a relay channel within the module is in an alarm state. This visual alert draws immediate attention to the presence of a potentially critical event or condition, enabling rapid response and timely corrective actions. It serves as a proactive tool for maintaining system integrity and minimizing potential downtime.
  • Relay Type: Single-Pole Double-Throw (SPDT): The relay type for the 16-Channel Relay Module is denoted as Single-Pole Double-Throw (SPDT). This configuration signifies that each relay has three terminals: a common terminal, a normally open terminal, and a normally closed terminal. This arrangement offers versatile connectivity options, allowing the relay to be configured for various applications.
  • Relay Environmental Sealing: Epoxy-Sealed: The epoxy-sealed construction of the relays exemplifies a commitment to durability and protection against environmental factors. This sealing safeguards the internal relay components from moisture, dust, and other contaminants. The epoxy-sealed design enhances the reliability and longevity of the relays, contributing to the module's overall robustness.
  • Relay Arc Suppressor: 250 Vrms Installed as Standard: The inclusion of a relay arc suppressor with a standard rating of 250 Vrms is a noteworthy safety feature. This component helps mitigate the impact of electrical arcs that can occur during relay operation, ensuring safe and reliable performance even under varying load conditions.
  • Relay Contact Life: 10,000 Cycles: The relay contact life specification indicates that each relay within the module is designed for 10,000 cycles. This figure quantifies the number of times the relay contacts can open and close before potential wear might affect performance. This information assists users in anticipating maintenance needs and system longevity.
  • Relay Operation: Normally Deenergized (ND) or Normally Energized (NE) Operation:
    The module offers flexibility in relay operation by allowing users to select between two modes: Normally Deenergized (ND) and Normally Energized (NE). This choice can be made independently for four groups of four channels. This configurational flexibility adapts the relay behavior to the specific requirements of different applications.

FCC Compliance and Certifications

Part 15 of the FCC Rules apply to this device. The following two conditions apply to operation:

  • This device may not cause harmful interference;
  • This device must accept any interference received, including interference that may cause undesired operation.

Functional Safety Considerations

  • In cases where the 16-Channel Relay Module is an integral component of a functional safety (SIL) system, specific voltage requirements come into play.
  • To comply with functional safety standards and certification, it is imperative to adhere to the prescribed voltage restrictions. Higher voltages are strictly prohibited within functional safety (SIL) systems, as they can compromise the integrity and reliability of the safety measures in place.

WOC supports a large number of Bently Nevada parts, including 3500/45. Please do not hesitate to contact us if you require additional information or have a question.


What is Bently Nevada 3500/33?
It is a 16-Channel Relay Module developed by Bently Nevada.

Which Data Acquisition Software is required to configure the module?
Version 2.40 or later, is required for this 16-Channel Relay Module.

What is the average input power consumption of the relay module?
5.8 watts is the average input power consumption.

How many 16-Channel Relay Modules can be placed in the rack?
Any of the slots to the right of the Transient Data Interface (TDI) Module can accommodate any quantity of 16-channel relay modules.

Can the voting logic be programmed for each output of the 16-Channel Relay Module?
Yes, voting logic can be individually programmed into each output of the 16-Channel Relay Module.