NS25B 25mm Optical Shutter


Current Lead Time: 4 – 5 weeks


Current Lead Time: 4 – 5 weeks

The Uniblitz NS25B is a 25mm-aperture bi-stable optical shutter utilizing our patented N-CAS® technology. The NS25B’s simple design provides maximum clearance around the aperture, and a machined flat surface makes for its easy integration into virtually any system. The NS25B has an overall diameter of 2.250 inches, and an electronic synchronization is available.

Bi-stable shutter devices, like the NS25B, require no power to hold the blades in either the open or closed state.

*The “For use in Vacuum” option will equip the shutter with encapsulated coils for vacuum levels up to 10-6 Torr. The housing, connector, and electronic sync options cannot be selected from the product builder when “For use in Vacuum” is applied as these options are not vacuum compatible and may cause outgassing. For higher vacuum-rated applications, or questions, please contact us.


Key Features

  • 25mm aperture
  • Bi-stable operation
  • Only two unique moving parts
  • Slim, low-profile form-factor
  • RoHS Compliant
  • Transfer time on opening: 5.0 milliseconds
  • Total opening time: 8.0 milliseconds
  • Can be configured for the VED24, VDM1000, or ED12DSS shutter drivers.



For additional technical information please see the NS25B Optical Shutter Datasheet.

Coil Resistance Pulse Voltage to Open Hold Voltage
6 OHMS 1 +10.7 VDC 2 N/A


Weight Operating Temp. Max. Opening Bounce Max. Closing Bounce Max. Freq. of Operation 3 Number of Shutter Blades
1.33 oz (0.04 kg) 0 – 80 °C 15% 5% 5.0 Hz / 30.0 Hz 5


1 Two 12 OHM coils wired in parallel
2 Peak voltage as provided by the VED24 Driver
3 (Continuous/Burst) Continuous frequency rating specified at shutter’s minimum exposure pulse. Burst frequency rating specified for four (4) seconds maximum with one (1) minute minimum between bursts.


Electronic Synchronization System

[columns][span7]The synchronization system for NS shutter devices incorporates a small magnet mounted to the driving mechanism and a Hall effect sensor. When the device achieves approximately 80% of full open, the magnet causes the Hall effect sensor to change state, producing a signal to indicate that the shutter has switched to the active state. Shown to the left is the NS series shutter schematic which incorporates the electronic synchronization system. There is no connection to the designated synchronization pins when an electronic sync. is not selected.

[/span7][span5]Uniblitz NS Series Electronic Sync Schematic Diagram [/span5][/columns]


Shutter Timing

[columns] [span5]timing-diagram-white

The question regarding enhancement of shutter speed with the application of user supplied lubricants has been repeatedly asked. It is our experience that lubricating the shutter blades will actually slow the shutter down and eventually render the shutter inoperable. Under no circumstances should any type of lubricant be applied to the shutter blade area.



NS25B (w/ VDM1000 driver and Teflon® coated blades) Time (msec.)
O – A:     Delay time on opening after current applied 3.0
A – C: Transfer time on opening 5.0
O – C: Total opening time 8.0
C – E: Min. dwell time with min. input pulse 6.0
B – F: Min. equivalent exp. time 11.0
D – E: Delay time on closing after current applied 3.0
E – G: Transfer time on closing 5.0
A – G: Total window time 16.0
MET: Min. exposure time 13.0
TEP: Typical exposure pulse >13.0



Technical Drawing

Uniblitz NS25B Technical Drawing



NS25B Datasheet Download


3D Models
NS25B 3D Outline Model (STEP included in ZIP) Download

Additional information

Driver Compatibility

, ,

Blade Option


Electronic Sync.


For use in Vacuum*


Flying Leads

No, Yes