1. General Information

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Number: 3500/34

• Product Name: TMR Relay Module (Triple Modular Redundancy)

• Series: 3500 Machinery Protection System

• Module Type: Full‑height safety trip relay module

• Application: Critical machine trip protection for steam turbine, compressor and high-value rotating equipment; Designed for SIL3 safety loop.

• Installation Rule: Any full-height slot in 3500 rack

• Compliance: API 670, SIL 3 Certified

2. Functional Description

• Channel Quantity: 3 independent TMR voting relay channels

• Voting Logic: 2-out-of-3 (2oo3) voting trip logic

• Relay Type: SPDT dry contact for each channel

• Working Mode: Normally Energized (Fail-safe trip design)

• Logic Configuration: AND / OR / Gating voting logic supported

3. Electrical Specifications

• Backplane Power: +5 VDC from rack backplane

• Power Consumption: 8.0 W typical

• Contact Rating (Resistive): 250 VAC / 5 A ; 30 VDC / 5 A

• Contact Rating (Inductive): 250 VAC / 2.5 A ; 30 VDC / 2.5 A

• Isolation Voltage: 1500 VAC isolation between relay contacts and system

• Response Time: ≤ 10 ms trip action

4. Environmental Specifications

• Operating Temperature: -30 °C ~ +65 °C (-22 °F ~ +149 °F)

• Storage Temperature: -40 °C ~ +85 °C (-40 °F ~ +185 °F)

• Relative Humidity: 5% ~ 95% (Non-condensing)

• Anti-vibration: Compliant with API 670 industrial vibration standard

5. Mechanical Specifications

• Structure: Full-height single slot module

• Dimensions (H × W × D): 241.3 × 24.4 × 99.1 mm

• Weight: Approximately 0.55 kg

• Mounting: 3500 standard rack slot installation, hot-swap capable

6. Compatible Devices

7. Key Features

• TMR triple modular redundancy architecture for maximum safety

• 2oo3 voting logic eliminates single-point failure

• Fail-safe normally energized trip design

• SIL3 safety certification for critical turbine protection system

• Independent channel status LED indication

8. Difference Between 3500/32 & 3500/34

• 3500/32: 4 single relays, non-redundant, common alarm control, for non-critical alarm loop.

• 3500/34: 3 TMR redundant relays, 2oo3 voting, SIL3, for turbine emergency trip loop.