characteristics bf2d-2/bf1d-2
![The picture shows the progressive safety gear BF2D-2/BF1D-2 (Tandem) from the front Basic body of the BF2D-2/BF1D-2 mounted in outer housing, EN81-20 / 50, acting bi-directional](https://slc-liftco.com/wp-content/uploads/2019/07/Dunkel_BF2D2-BF1D2_L_-e1562587270604-768x712.jpg)
Type:
Progressive safety gear (downwards)
Protection device against overspeed (upwards)
Protection device against unintended car movement (UCM)
Guide rail:
Drawn / Machined
Guide rail thickness: 9 – 30 mm
Guide rail width (minimum): 20 mm
Maximum tripping speed
Machined: 3.23 m/s
Drawn: 2.63 m/s
UCM: 2.20 m/s
Maximum nominal speed
Drawn: 2.20 – 2.29 m/s
Machined: 2.50 – 2.81 m/s
Permissible total mass acting downwards
![Permissiple total mass BF2D-2/BF1D-2 acting downwards Safety brake device, bi-directional acting, EN81-20 / 50, Lifts Directive 2014/33 / EU](https://slc-liftco.com/wp-content/uploads/2019/08/BF2D-2_Tandem-data_downwards.png)
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Permissible brake forces for acting upwards
![Permissible brake forces BF2D-2/BF1D-2 for acting upwards Safety brake device, bi-directional acting, EN81-20 / 50, Lifts Directive 2014/33 / EU](https://slc-liftco.com/wp-content/uploads/2019/07/2-4.png)
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Permissible brake forces as UCM device (upwards)
![Permissible brake forces BF2D-2 as UCM device (upwards) Safety brake device, bi-directional acting, EN81-20 / 50, Lifts Directive 2014/33 / EU](https://slc-liftco.com/wp-content/uploads/2019/08/BF2D-2_data-UCM.png)
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Permissible brake forces as UCM device (downwards)
![Permissible brake forces BF2D-2 as UCM device (downwards) Safety brake device, bi-directional acting, EN81-20 / 50, Lifts Directive 2014/33 / EU](https://slc-liftco.com/wp-content/uploads/2019/07/3e-1.png)
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