860-928-6551 Brooklyn, Connecticut


Stop an entire operation if one machine fails.

4100 Series Zero Speed Switch

Operating Range: 4 to 1800 RPM

The 4100 Series Zero Speed Switches 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 4 to 1800 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

4100 Series
DriverV-belt, Roller wheel, Chain drive or Sprocket
Shaft Diameter1/2″ (1.27 cm)
Operating Range4 to 1800 RPM
Driver TorqueRequired.0208 ft-lb (4 in-oz) (.0282 Nm)
Temperature Tolerance-40°F to +250°F (-40°C to +121°C)
Housing OptionsAluminum (AL) or Cast Iron (CI)
NEMA Rating4/4x
Mounting OptionsBase Mount
Dimensions (L x W x H)6.95″ x 4.25″ x 3.93″ (17.65 cm x 10.80 cm x 9.98 cm)
Wiring Contact OptionsSPDT, DPDT, SPDT(2)
WeightAL – 4 lbs. (1.81 kg)      CI – 8 lbs. (3.63 kg)
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 ThrowDPDT Double Pole, Double ThrowSPDT(2) Direction Indicating
24200014 to 1910 RPM0 RPM412041224130
152008 to 11Approx. 2 Sec. After Shaft Rotation Failure4120-14122-14130-1
81005 to 7Approx. 3 Sec. After Shaft Rotation Failure4120-54122-54130-5
4502 to 3Approx. 5 Sec. After Shaft Rotation Failure4120-104122-104130-10
30180025 to 7030-40% Below Trip Point04120-A14122-A14130-A1
75180080 to 14030-40% Below Trip Point04120-A24122-A24130-A2
1601800130 to 30030-40% Below Trip Point04120-A34122-A34130-A3
2401800200 to 60030-40% Below Trip Point04120-A44122-A44130-A4
1520010 to 4530-40% Below Trip Point04120-A114122-A114130-A11
71005 to 1530-40% Below Trip Point04120-A154122-A154130-A15

Swtiches can be mounted in any position but they must be aligned and concentric with the corresponding drive shaft.

How To Order

Housing MaterialModel No.Mounting Style
(AL or CI) 41xx-xx (B)

For example: Model 4120-1 with Cast Iron housing and Base mount = CI-4120-1-B

Dazic Speed Switch 4100 series


Single Pole, Double Throw

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Double Pole, Double Throw

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Direction Indicating

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