860-928-6551 Putnam, 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
Driver Shaft-to-Shaft
Shaft Diameter 1/2″ (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 Options Cast Aluminum
NEMA Rating 7/9
Mounting Options Base 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 Options SPDT, DPDT, SPDT(2)
Weight 13 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. RPM MAX. RPM SLOW LOSS RAPID LOSS Model No. Model No. Model No.
NOT FIELD ADJUSTABLE
24 2000 14 to 19 10 RPM 0 RPM 2120 2122 2130
15 200 8 to 11 Approx. 2 Sec. After Shaft Rotation Failure 2120-1 2122-1 2130-1
8 100 5 to 7 Approx. 3 Sec. After Shaft Rotation Failure 2120-5 2122-5 2130-5
4 50 2 to 3 Approx. 5 Sec. After Shaft Rotation Failure 2120-10 2122-10 2130-10
FIELD ADJUSTABLE
30 2000 25 to 70 30-40% Below Trip Point 0 2120-A1 2122-A1 2130-A1
75 2000 60 to 140 30-40% Below Trip Point 0 2120-A2 2122-A2 2130-A2
150 2000 125 to 300 30-40% Below Trip Point 0 2120-A3 2122-A3 2130-A3
240 2000 200 to 600 30-40% Below Trip Point 0 2120-A4 2122-A4 2130-A4
15 200 10 to 45 30-40% Below Trip Point 0 2120-A11 2122-A11 2130-A11
7 100 5 to 15 30-40% Below Trip Point 0 2120-A15 2122-A15 2130-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. RPM MAX. RPM SLOW LOSS RAPID LOSS Model No. Model No. Model No.
NOT FIELD ADJUSTABLE
24 2000 14 to 19 10 RPM 0 RPM 2120 2122 2130
15 200 8 to 11 Approx. 2 Sec. After Shaft Rotation Failure 2120-1 2122-1 2130-1
8 100 5 to 7 Approx. 3 Sec. After Shaft Rotation Failure 2120-5 2122-5 2130-5
4 50 2 to 3 Approx. 5 Sec. After Shaft Rotation Failure 2120-10 2122-10 2130-10
FIELD ADJUSTABLE
30 2000 25 to 70 30-40% Below Trip Point 0 2120-A1 2122-A1 2130-A1
75 2000 60 to 140 30-40% Below Trip Point 0 2120-A2 2122-A2 2130-A2
150 2000 125 to 300 30-40% Below Trip Point 0 2120-A3 2122-A3 2130-A3
240 2000 200 to 600 30-40% Below Trip Point 0 2120-A4 2122-A4 2130-A4
15 200 10 to 45 30-40% Below Trip Point 0 2120-A11 2122-A11 2130-A11
7 100 5 to 15 30-40% Below Trip Point 0 2120-A15 2122-A15 2130-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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