9903-543 Woodward | Triple Redundant Overspeed Protection

Availability: 99 left in stock

Woodward 9903-543 ProTech-GII TMR Energize-to-Trip Overspeed Protection Panel The 9903-543 (Model: 9903-543) is a high-integrity digital overspeed protection system belonging to the...

SKU: 9903-543

Manufacturer: Woodward
Product No.: 9903-543
Product Type: Overspeed Protection Panel
Product Origin: USA
Payment:T/T, Western Union
Weight: 6000g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Woodward 9903-543 ProTech-GII TMR Energize-to-Trip Overspeed Protection Panel

The 9903-543 (Model: 9903-543) is a high-integrity digital overspeed protection system belonging to the Woodward ProTech-GII family. This specialized panel is engineered to provide fail-safe monitoring and emergency shutdown capabilities for critical rotating machinery, including gas, steam, and hydro turbines. The 9903-543 (Part Number: 9903-543) utilizes a Triple Modular Redundant (TMR) architecture, incorporating three independent microprocessors and three separate magnetic pickup (MPU) inputs. By employing a 2-out-of-3 (2oo3) voting logic, the system ensures that a single component failure will not cause a false trip, nor will it prevent a necessary safety shutdown.

As an Energize-to-Trip (ETT) version, the 9903-543 (ProTech-GII: 9903-543) is configured such that the trip relays are normally de-energized and must receive power to initiate a turbine shutdown. This specific logic is frequently required in plant safety architectures where the prevention of unintended trips due to control power loss is a priority. With a response time of less than 12 ms, this device provides authoritative protection against mechanical overstress, making it a standard in power generation and petrochemical facilities worldwide.

Detailed Technical Specifications

The 9903-543 (9903-543) provides precision speed sensing and robust communication for industrial environments.

Parameter	Specification
Manufacturer	Woodward
Model Number	9903-543
Product Series	ProTech-GII Overspeed Protection
Trip Logic	Energize-to-Trip (ETT)
Voting Architecture	Triple Modular Redundant (TMR) 2oo3
Input Power	24 VDC (Supports Redundant Supplies)
Sensing Inputs	3 Independent Magnetic Pickups (MPUs)
Response Time	< 12 ms (Typical)
Relay Outputs	Redundant Form-A / Form-C Relays
Communication	Modbus RTU (RS-485) / Modbus TCP (Ethernet)
Operating Temp	–20 °C to +60 °C
Dimensions	482 mm × 310 mm × 143 mm
Weight	6–7 kg (Industrial Chassis)
Compliance	Industrial-grade EMI/EMC Standards

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

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Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

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Engineering Lead, Germany

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We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.