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Your benefits

High flexibility
with direct motor mounting because there is no longer any need for an adapter with clamp coupling.

Incredible performance
thanks to the high operating speeds and efficiency levels.

High reliability
due to the wear-free gearing and consistently low rotational clearance.

BS.F series explosion-proof helical-bevel servo gear units
Explosion-proof, low-backlash planetary servo gear units: compact and reliable

Explosion protection with a compact design, high speeds and high torques: That’s what sets our ATEX-compliant planetary servo gear units apart.

Our planetary gear units reliably deliver precision and cost-effectiveness in potentially explosive atmospheres. The PS.F series offers torques from 25 Nm to 3000 Nm.

They feature a consistently low rotational clearance and high torsional rigidity. All gear ratios from i = 3 to i = 100 are integers and finely stepped. This means that these explosion-proof servo gear units in equipment category II are also especially suitable for use with controllers that require integer resolution ratios.

Only half the solution without a motor? Then use our sophisticated modular concept and combine the explosion-proof servo gear units of the PS.F series with the explosion-proof servomotor of your choice.
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  • Low-backlash ATEX-compliant planetary servo gear units
  • Designed for torque classes from 25 Nm to 3000 Nm
  • Available in two output variants:
    • PSF: B5 output, flange, smooth solid shaft (without key)
    • PSKF: B5 output, flange, solid shaft with key
 PS.F series explosion-proof planetary servo gear units
Type Size, single-stage Size, two-stage Torque class
Nm 		Gear ratio i 3)
1-stage 		Gear ratio i 3)
2-stage 		Rotational clearance `
1-stage 		Rotational clearance `
2-stage
PSF 121 122 25 3 / 4 / 5 / 7 / 10 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 8 4) / 4 5) / 2 6) 10 / 6 / 3
PSF 221
 222
 55 3 / 4 / 5 / 7 / 10
 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 6 / 3 / 1 8 / 4 / 2
PSF 321
 322
 110 3 / 4 / 5 / 7 / 10
 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 6 / 3 / 1 8 / 4 / 2
PSF 521
 522
 300 3 / 4 / 5 / 7 / 10
 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 6 / 3 / 1 8 / 4 / 2
PSF 621
 622
 600 4 / 5 / 7 / 10
 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 4 / 2 / 1 6 / 3 / 1
PSF 721
 722
 1,000 4 / 5 / 7 / 10
 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 4 / 2 / 1 6 / 3 / 1
PSF 821
 822
 1,750 4 / 5 / 7 / 10
 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 4 / 2 / 1 6 / 3 / 1
PSF 921 922 3,000 4 / 5 / 7 / 10 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100 4 / 2 / 1 6 / 3 / 1

3) Other gear ratios on request

4) Standard

5) Reduced

6) Minimized
  • Applications in potentially explosive atmospheres with air/gas or air/dust mixtures according to Directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX)
  • Applications with equipment categories II2GD
  • Use with air mixtures
    • With gases (G): in zones 1 and 2
    • With dusts (D): in zones 21 and 22
  • Examples:
    • Packaging machines
    • Machine tools
    • Filling and metering units
    • Labeling machines
    • FFS machines
    • Incremental launches
    • Pick & place robots
    • Robot travel axes
    • Flying saw
    • Processing machines
    • Handling gantries
    • Conveyor belts
    • Feed, pivoting and auxiliary axes
    • Travel axes, additional axes
    • Wood processing centers