860-928-6551 Brooklyn, Connecticut

ZERO SPEED SWITCHES

Stop an entire operation if one machine fails.

Explosion Proof Zero Speed Switches

Operating Range:
2100 EP Series — 4 to 2000 RPM
8100 EP Series — 0.5 to 25 RPM

DAZIC® 2100 EP and 8100 EP Series explosion proof electromechanical rotary motion control zero speed switches monitor the rotary motion of equipment when interlocked as part of a conveyor system, or other shaft-driven process components in hazardous locations.* The switches ensure that if one machine deviates or fails, the switch will:

  • Actuate a signal or alarm device
  • Break a circuit to a motor
  • Make a circuit to start auxiliary equipment
  • Make or break a circuit to other electrical devices
  • Signal a control station or PLC

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

2100 EP and 8100 EP Series
DriverShaft-to-Shaft
Shaft Diameter1/2″ (1.27 cm)
Driver Torque Required.0208 ft-lb (4 in-oz) (.0282 Nm)
Temperature Tolerance-40°F to +250°F

-40°C to +121°C
Housing OptionsCast Aluminum
NEMA Rating7/9
Mounting OptionsBase Mount
Dimensions (L x W x H)7.29″ x 6.55″ x 5.93″ (18.52 cm x 16.64 cm x 15.06 cm)
Wiring Contact OptionsSPDT, DPDT, SPDT(2)
Weight13 lbs. (5.9 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 Throw
DPDT

Double Pole,

Double Throw
SPDT(2)

Direction

Indicating
MIN. RPMMAX. RPMSLOW LOSSRAPID LOSSModel No.Model No.Model No.
NOT FIELD ADJUSTABLE
24200014 to 1910 RPM0 RPM212021222130
152008 to 11Approx. 2 Sec. After Shaft Rotation Failure2120-12122-12130-1
81005 to 7Approx. 3 Sec. After Shaft Rotation Failure2120-52122-52130-5
4502 to 3Approx. 5 Sec. After Shaft Rotation Failure2120-102122-102130-10
FIELD ADJUSTABLE
30200025 to 7030-40% Below Trip Point02120-A12122-A12130-A1
75200060 to 14030-40% Below Trip Point02120-A22122-A22130-A2
1502000125 to 30030-40% Below Trip Point02120-A32122-A32130-A3
2402000200 to 60030-40% Below Trip Point02120-A42122-A42130-A4
1520010 to 4530-40% Below Trip Point02120-A112122-A112130-A11
71005 to 1530-40% Below Trip Point02120-A152122-A152130-A15
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. RPMMAX. RPMSLOW LOSSRAPID LOSSModel No.Model No.Model No.
NOT FIELD ADJUSTABLE
24200014 to 1910 RPM0 RPM212021222130
152008 to 11Approx. 2 Sec. After Shaft Rotation Failure2120-12122-12130-1
81005 to 7Approx. 3 Sec. After Shaft Rotation Failure2120-52122-52130-5
4502 to 3Approx. 5 Sec. After Shaft Rotation Failure2120-102122-102130-10
FIELD ADJUSTABLE
30200025 to 7030-40% Below Trip Point02120-A12122-A12130-A1
75200060 to 14030-40% Below Trip Point02120-A22122-A22130-A2
1502000125 to 30030-40% Below Trip Point02120-A32122-A32130-A3
2402000200 to 60030-40% Below Trip Point02120-A42122-A42130-A4
1520010 to 4530-40% Below Trip Point02120-A112122-A112130-A11
71005 to 1530-40% Below Trip Point02120-A152122-A152130-A15

Swtiches can be mounted in any position but they must be aligned and concentric with the corresponding drive shaft. Explosion Proof Zero Speed Switches are available with only the Type B – Base Mount.

How To Order

Add the suffix /EP1 to the model number.
For example:
Model 2120-A3 = 2120-A3/EP1
Model 81212-5 = 81212-5/EP1

Dazic Explosion Proof

SPDT

Single Pole, Double Throw

click to enlarge

DPDT

Double Pole, Double Throw

click to enlarge

SPDT(2)

Direction Indicating

click to enlarge

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