9905-881 Image One
3 year warranty

9905-881 Image 1
9905-881 Image 2
9905-881 Image 3
9905-881 Image 4


    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.50 (2)
  • Click a star to rate this product
    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.50 (2)
  • Click a star to rate this product
De-energize-to-Trip 9905-881 Unit from Woodward ProTech 203 Series. Displays the actual speed from each speed probe, the highest speed signal, as well as features online testing with a modular design.



Sell Surplus: Have a 9905-881 to sell? Sell Now
Exchange Credit: Learn more about our exchange credit program
  • Part Number: 9905-881
  • SKU: 9905881WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-881 Technical Specifications

Dimensions W19in x H12.244in x D5.62in (with knobs and key)
Features Hot Replacement
Input Voltage (2) 24Vdc and (1) 120 Vac/dc
Manual Woodward 85191
Model De-energize-to-Trip
NEMA Rating 4x for NA, IP54 for EU
Operating Temperature –13 to +140 °F
Standards Adequate ventilation for cooling and space for servicing
Weight 13lbs 1oz

Product Description

ProTech 203 model 9905-881 has many features that make it a smart choice for your overspeed protection needs. This de-energize-to-trip system has a remote reset feature, which allows it to be conveniently reset from a remote location after a trip or before starting the turbine. The 9905-881 also has LED indicators for each of the system’s three-speed sensing units, allowing operators to quickly identify any system or hardware issues, or at least know where to start troubleshooting.

Model 9905-881 provides an accurate output by way of a two-out-of-three hardware vote configuration. The design of this system permits the prime mover to remain online even if only two of the three units are functioning. This means that should one of the unit trips, is being tested, or is being replaced, operations may continue with an accurate, reliable output.  

This ProTech 203 model has three magnetic pickups (MPUs). These MPUs are each interfaced with a speed-sensing unit. The individual 9905-881 units have their own operator interface, and all units are in a single, key-locked enclosure. NEMA 4X standards are met only if the optional stainless steel hubs are used.

Operator interface features include:

  • LCD display
  • Keypad
  • Functional status LED indicators

Along with having individual operator interfaces, each speed-sensing unit also has its own power supply. On model 9905-881, Unit A and Unit B both have a 24 Vdc power supply, and Unit C has a 120 Vac/dc power supply. More information may be found in Woodward ProTech 203 Manual 85191 (version B).

Reviews For 9905-881

Internal Review

The 9905-881 can be configured so that on the sudden loss of that unit's MPU, the unit can either output both an alarm plus a trip signal, or the unit can output only an alarm. - AX Control Tech

Repair Services For 9905-881

Type Lead Time Price Action
Repair Service 1-2 weeks $5330

Our highly skilled technicians can repair your 9905-881. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
Learn More

9905-881 Manuals, White Papers, Data Sheets, and Troubleshooting