Product Models and Specifications


Maximum Load 2.26 N-m (20 lb-in)
Direction CW, CCW
Voltage 24 VDC Pick/12 VDC Hold
Connector Molded connector
Bore 8mm
Shaft Cross Pin
Electromechanical wrap spring clutch
Low Wattage
The EC20CBLL requires 14 watts at 24 volts for engagement. This voltage is held for 50 msec. The hold voltage of 12 volts uses only 3.5 watts of power.
High Torque, Small Package Size
The EC20 CBLL provides 2.26 N-m (20 lb-in) of total load over a life of 1 million actuations with an outside diameter of about 33mm (1.75 inches), and a shaft length of about 25.4mm (1 inch). Part weight is 141g (.310 lbs)
Rapid Acceleration
After spring wrap-down, the EC20CBLL will accelerate loads from zero to full speed in less than 3 milliseconds.
Consistent Performance
Engagement is made with virtually no slippage and disengagement is almost instantaneous.
Power Source
All Reell clutches operate on either filtered or unfiltered dc power. The EC20CBLL requires a pick voltage of 24V and a hold voltage of 12V. The use of filtered power is recommended for better life at high speed.
Operating Parameters

EC20CBLL performance is best within the following conditions:

  • 0°- 40° C (32°-104° F)
  • 100-800 rpm typical, 1400 rpm max.
  • Minimum load friction torque 0.05 N-m (6.0 oz-in) plus customer input bearing torque.

Single Direction
Wrap spring clutches provide torque only in the direction in which they wrap down. This allows for overrunning.
Relative High Shock
Due to the EC25's rapid acceleration, system inertia effects can be significant. In some applications an in-line slip device may be used for shock absorption. Please contact a Reell Sales Representative for more information regarding this option.
Engagement Relative to Speed
The EC25 relies on relative motion between the input and output for engagement. Thus, the slower the speed, the longer the time until engagement.


Details Type File
2D Sales Drawing CAD 2D Download File
3D CAD Solid Model - IGES CAD 3D Register to Download
Reell Clutch Technical Data Sheet Product Info Download File

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