ZERO SPEED SWITCHES
Stop an entire operation if one machine fails.
8100 Series Zero Speed Switch
Operating Range: 0.5 to 25 RPM
The 8100 Series Zero Speed Switches are deal for slow speed applications. They are electromechanical rotary motion controls requiring no electrical input to operate. These shaft-driven devices can let you know if equipment is running too fast, too slow, or not at all.
These UL-approved speed switches can be interlocked as part of a conveyor system to ensure that if one machine fails, the entire operation will stop, avoiding an expensive and time-consuming pile-up of material.
- For shaft input speeds of 0.5 to 25 RPM.
- Will operate in temperatures ranging from -40° F to +250° F (-40° C to +482° C).
- NEMA 4/4X housings are painted with an epoxy-based powder coat to provide corrosion resistance, as well as protection against dust, rain and hose-directed water.
Speed Switch devices coupled to a corresponding shaft, must be properly mounted and aligned to avoid putting extra load on motor bearings, which may cause premature failure. The use of installation accessories such as Mounting Brackets and K-Couplings provide a secure foundation and eliminate misalignment connection problems. Need assistance choosing the appropriate speed switch? Fill out the Application Data Sheet and a Sales Engineer will help determine which switch is right for your specific application. Dazic® Application Data Sheet
|Shaft Diameter||1/2″ (1.27 cm)|
|Operating Range||0.5 to 25 RPM|
|Driver Torque Required||.0208 ft-lb (4 in-oz) (.0282 Nm)|
|Temperature Tolerance||-40°F to +250°F (-40°C to +121°C)|
|Housing Options||Aluminum (AL) or Cast Iron (CI)|
|Mounting Options||Base Flange or Flange with Pilot|
|Dimensions (L x W x H)||6.02″ x 4.25″ x 3.93″ (15.29 cm x 10.80 cm x 9.98 cm)|
|Wiring Contact Options||SPDT, DPDT, SPDT(2)|
|Weight||AL – 4 lbs. (1.81 kg) CI – 8 lbs. (3.63 kg)|
Not Field Adjustable
|Speed Switch Input (RPM) (Application Running Speed)||Approximate Contact Operating Speeds (RPM)||Contact Type|
|Start-Up Trip-Point Upon Initial Speed Switch Acceleration (RPM)||Drop-Out Point On Shaft Speed Loss (RPM)||SPDT Single Pole, Double Throw||DPDT Double Pole, Double Throw||SPDT(2) Direction Indicating|
|MIN. RPM||MAX. RPM||SLOW LOSS||RAPID LOSS||Model No.||Model No.||Model No.|
|1.5||5||1.5||0.5 RPM||0 RPM||8121||81212||8131|
|0.5||2.5||0.5||Approx. 4 Sec. After Shaft Rotation Failure||8121-5||81212-5||8131-5|
|2||25||1.5||Approx. 3-5 Sec. After Shaft Rotation Failure||8121-5||81222-5||8132-5|
How To Order
|Housing Material||–||Model No.||–||Mounting Style|
|(AL or CI)||81xx-xx||(B, F, or FK)|
For example: Model 8121-5 with Cast Iron housing and Base mount = CI-8121-5-B