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Pneumatic Spring Applied Wind Turbine Brakes

The New PFS200EP series with Extended Friction Pads
W.C. Branham brings spring applied caliper disc brakes from the factory floor to towering wind turbines.
Wind Turbine Friendly.
As part of over-speed protection, spring applied brakes have the ability to stop the wind turbine rotor in harsh conditions.
Pneumatic (PFS)
W.C. Branham Inc. has a wide breadth of pneumatic spring applied brakes. They include the PFS47, PFS200, PFS200UL, and PFS400 series' as well as the recently introduced PFS520 and PFS522 series'.
The PFS400 has 2 times the brake holding torque than that of the PFS200 series and 4 times than that of the PFS47. The PFS520 has 3.3 times and the PFS522 has 6.6 times the brake holding torque of the PFS400.
How do they work?
Active minimum pressure releases the brake piston (pulls the brake piston away) from the brake disc rotor and stores that energy in a Belleville disc spring stack. At pressure loss, the energy stored in the disc spring stack is emitted driving the brake piston and engaging the disc rotor for positive stopping.
Common Features.
- Cast aluminum construction | Hardcoated housings | Non-asbestos friction material | Replaceable friction pads | Buna-N seals | Viton® seals optional | Float mount | Belleville disc spring stack
- Standard models for brake disc thicknesses of 5/32, 1/4, 3/8,1/2, 5/8, 3/4, 1.0 and 1-1/8 inches.
- We welcome custom brake disc thicknesses including metric.


Specifications
(click  for more details)
Showing Imperial Measurements - Switch to Metric Measurements
PFS47 Series
- Single Belleville Disc Spring Stack | 465 lb. Tangential Force at zero friction pad wear | 6570 in. lbs. F. using 30 inch disc diameter at maximum tangential force | 4.10 sq. in. total friction pad area | 1033 lb. clamping force | Unlimited disc diameter
PFS200 Series
- Dual Belleville Disc Spring Stacks | 929 lb. Tangential Force at zero friction pad wear | 6626 in. lbs. F. using 16 inch disc diameter at maximum tangential force | 8.19 sq. in. total friction pad area | Up to 16 inch disc diameter
PFS200EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 929 lb. Tangential Force at zero friction pad wear | 13,129 in. lbs. F. using 30 inch disc diameter at maximum tangential force | 2065 lb. clamping force | 23.89 sq. in. total friction pad area | 7.72 cu. in. of wearable material | From 12 inch to unlimited disc diameter
PFS200UL Unlimited Disc Series - Choose From Single or Double Acting Models
- Dual Belleville Disc Spring Stacks | 929 lb. Tangential Force at zero friction pad wear | 13,129 in. lbs. F. using 30 inch disc diameter at maximum tangential force | 8.19 sq. in. total friction pad area | Unlimited disc diameter
PFS400 Series
- Dual Belleville Disc Spring Stacks | 1859 lb. Tangential Force at zero friction pad wear | 35,568 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 18371 N. clamping force | 8.19 sq. in. total friction pad area
PFS400EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 1859 lb. Tangential Force at zero friction pad wear | 35,568 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 18371 N. clamping force | 23.89 sq. in. total friction pad area | 7.72 cu. in. of wearable material | From 12 inch to unlimited disc diameter
PFS520 Series
- Dual Belleville Disc Spring Stacks | 6,118 lb. Tangential Force at zero friction pad wear |110,325 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 13,596 lb. clamping force | 47.0 sq. in. total friction pad area | Brake disc diameter starting at 20 inches up to unlimited diameter
PFS522 Series
- Dual Belleville Disc Spring Stacks | 12,236 lb. Tangential Force at zero friction pad wear | 220,651 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 27,192 lb. clamping force | 47.0 sq. in. total friction pad area | Brake disc diameter starting at 20 inches up to unlimited diameter
Engineering note: Spring applied brakes are intended for use as an emergency stop or static holding device. It is not suggested to use in continuous slip applications as torque capacity is directly related to friction pad wear.
Showing Metric Measurements - Switch to Imperial Measurements
PFS47 Series
- Single Belleville Disc Spring Stack | 2068 N. Tangential Force at zero friction pad wear | 742 Nm. using 762 mm. disc diameter at maximum tangential force | 26.45 sq.cm. total friction pad area | 232 N. clamping force | Unlimited disc diameter
PFS200 Series
- Dual Belleville Disc Spring Stacks | 4132 N. Tangential Force at zero friction pad wear | 749 Nm. using 406 mm. disc diameter at maximum tangential force | 52.84 sq.cm. total friction pad area | Up to 406 mm disc diameter
PFS200SUL Unlimited Disc Series
- Dual Belleville Disc Spring Stacks | 4132 N. Tangential Force at zero friction pad wear | 1483 Nm. using 762 mm. disc diameter at maximum tangential force | 9186 N. clamping force | 52.84 sq.cm total friction pad area | Unlimited disc diameter
PFS200EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 4132 N. Tangential Force at zero friction pad wear | 1483 Nm. using 762 mm. disc diameter at maximum tangential force | 9186 N. clamping force | 154.13 sq.cm. total friction pad area | 126 cu.cm. of wearable material | From 305 mm to unlimited disc diameter
PFS400 Series
- Dual Belleville Disc Spring Stacks | 8269 N. Tangential Force at zero friction pad wear | 4018 Nm. using 1016 mm. disc diameter at maximum tangential force | 18,379 N. clamping force | 154.13 sq. cm. total friction pad area | Unlimited disc diameter
PFS400EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 8269 N. Tangential Force at zero friction pad wear | 4018 Nm. using 1016 mm. disc diameter at maximum tangential force | 18,379 N. clamping force | 154.13 sq.cm. total friction pad area | 126 cu. cm. of wearable material | From 305 mm. to unlimited disc diameter
PFS520 Series
- Dual Belleville Disc Spring Stacks | 28,565 N. Tangential Force at zero friction pad wear | 12,465 Nm. using 1016 mm. disc diameter at maximum tangential force | 63,475 N. clamping force | 303.23 sq.cm. total friction pad area | Brake disc diameter starting at 508 mm. up to unlimited diameter
PFS522 Series
- Dual Belleville Disc Spring Stacks | 54,428 N. Tangential Force at zero friction pad wear | 24,929 Nm. using 1016 mm. disc diameter at maximum tangential force | 120,956 N. clamping force | 303.23 sq.cm total friction pad area | Brake disc diameter starting at 508 mm. up to unlimited diameter
Special Note.
Friction pad wear effects braking torque. Therefore, PFS series caliper brakes should not be used for tensioning or high cyclic stop applications.
Products Available
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Product # |
Name |
Description |
Additional Info |
Disc Thick.(in.) |
Tangential Force |
|
4004-0222W |
PFS47AF |
Single Acting, Floating Mount. Use Fixed Disc |
Single Piston. Spring Applied 85 PSI Rel. |
5/32 |
465 lbf, 2068 N |
|
4004-0225W |
PFS47BF |
Single Acting, Floating Mount. Use Fixed Disc |
Single Piston. Spring Applied 85 PSI Rel. |
1/4 |
465 lbf, 2068 N |
|
4004-0226W |
PFS47LF |
Single Acting, Floating Mount. Use Fixed Disc |
Single Piston. Spring Applied 85 PSI Rel. |
3/8 |
465 lbf, 2068 N |
|
4004-0227W |
PFS47EF |
Single Acting, Floating Mount. Use Fixed Disc |
Single Piston. Spring Applied 85 PSI Rel. |
1/2 |
465 lbf, 2068 N |
|
4004-0231W |
PFS200AF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
5/32 |
929 lbf, 4132 N |
|
4004-0232W |
PFS200BF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
1/4 |
929 lbf, 4132 N |
|
4004-0233W |
PFS200LF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
3/8 |
929 lbf, 4132 N |
|
4004-0234W |
PFS200EF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
1/2 |
929 lbf, 4132 N |
|
4004-0256W |
PFS47TF |
Single Acting, Floating Mount. Use Fixed Disc |
Single Piston. Spring Applied 85 PSI Rel. |
3/4 |
465 lbf, 2068 N |
|
4004-0265W |
PFS200TF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
3/4 |
929 lbf, 4132 N |
|
4004-0771W |
PFS400AF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
5/32 |
1859 lbf, 8269 N |
|
4004-0772W |
PFS400BF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
1/4 |
1859 lbf, 8269 N |
|
4004-0773W |
PFS400LF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
3/8 |
1859 lbf, 8269 N |
|
4004-0774W |
PFS400EF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
1/2 |
1859 lbf, 8269 N |
|
4004-0775W |
PFS400HF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
5/8 |
1859 lbf, 8269 N |
|
4004-0776W |
PFS400TF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
3/4 |
1859 lbf, 8269 N |
|
4004-0777W |
PFS400OF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
1.0 |
1859 lbf, 8269 N |
|
4004-0778W |
PFS400QF |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 100 PSI Rel. |
1-1/8 |
1859 lbf, 8269 N |
|
4005-0030W |
PFS200SAUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
5/32 |
929 lbf, 4132 N |
|
4005-0031W |
PFS200SBUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
1/4 |
929 lbf, 4132 N |
|
4005-0032W |
PFS200SLUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
3/8 |
929 lbf, 4132 N |
|
4005-0033W |
PFS200SEUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
1/2 |
929 lbf, 4132 N |
|
4005-0034W |
PFS200SJUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
5/8 |
929 lbf, 4132 N |
|
4005-0035W |
PFS200STUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
3/4 |
929 lbf, 4132 N |
|
4005-0036W |
PFS200SOUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
1.0 |
929 lbf, 4132 N |
|
4005-0037W |
PFS200SQUL |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel |
1-1/8 |
929 lbf, 4132 N |
 |
4005-0038W |
PFS200DAUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
5/32 |
929 lbf, 4132 N |
 |
4005-0039W |
PFS200DBUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
1/4 |
929 lbf, 4132 N |
 |
4005-0040W |
PFS200DLUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
3/8 |
929 lbf, 4132 N |
 |
4005-0041W |
PFS200DEUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
1/2 |
929 lbf, 4132 N |
 |
4005-0042W |
PFS200DJUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
5/8 |
929 lbf, 4132 N |
 |
4005-0043W |
PFS200DTUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
3/4 |
929 lbf, 4132 N |
 |
4005-0044W |
PFS200DOUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
1/0 |
929 lbf, 4132 N |
 |
4005-0045W |
PFS200DQUL |
Double Acting, Fixed Mount. Use Fixed or Floating Disc |
Quad Pistons. Spring Applied 85 PSI Release Pressure |
1-1/8 |
929 lbf, 4132 N |
 |
4005-0125W |
PFS400IF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
3/16 |
1859 lbf, 8269 N |
 |
4005-0126W |
PFS400BF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1/4 |
1859 lbf, 8269 N |
 |
4005-0127W |
PFS400LF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
3/8 |
1859 lbf, 8269 N |
 |
4005-0128W |
PFS400EF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1/2 |
1859 lbf, 8269 N |
 |
4005-0129W |
PFS400JF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
5/8 |
1859 lbf, 8269 N |
 |
4005-0130W |
PFS400TF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
3/4 |
1859 lbf, 8269 N |
 |
4005-0131W |
PFS400OF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1.0 |
1859 lbf, 8269 N |
 |
4005-0132W |
PFS400QF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1-1/8 |
1859 lbf, 8269 N |
 |
4005-0139W |
PFS200AF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
5/32 |
929 lbf, 4132 N |
 |
4005-0140W |
PFS200IF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
3/16 |
929 lbf, 4132 N |
 |
4005-0141W |
PFS200BF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1/4 |
929 lbf, 4132 N |
 |
4005-0142W |
PFS200LF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
3/8 |
929 lbf, 4132 N |
 |
4005-0143W |
PFS200EF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1/2 |
929 lbf, 4132 N |
 |
4005-0144W |
PFS200JF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
5/8 |
929 lbf, 4132 N |
 |
4005-0145W |
PFS200TF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
3/4 |
929 lbf, 4132 N |
 |
4005-0146W |
PFS200OF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1.0 |
929 lbf, 4132 N |
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4005-0147W |
PFS200QF-EP |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 85 PSI Rel. |
1-1/8 |
929 lbf, 4132 N |
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4252-0080W |
PFS522SE |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 90 PSI Rel. |
1/2 |
12236 lbf, 54428 N |
 |
4252-0081W |
PFS522SJ |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 90 PSI Rel. |
5/8 |
12236 lbf, 54428 N |
 |
4252-0082W |
PFS522ST |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 90 PSI Rel. |
3/4 |
12236 lbf, 54428 N |
 |
4252-0083W |
PFS522SO |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 90 PSI Rel. |
1.0 |
12236 lbf, 54428 N |
 |
4252-0084W |
PFS522SQ |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 90 PSI Rel. |
1-1/8 |
12236 lbf, 54428 N |
 |
4252-0093W |
PFS520SE |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
1/2 |
6419 lbf, 28565 N |
 |
4252-0094W |
PFS520SJ |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
5/8 |
6419 lbf, 28565 N |
 |
4252-0095W |
PFS520ST |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
3/4 |
6419 lbf, 28565 N |
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4252-0096W |
PFS520SO |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
1.0 |
6419 lbf, 28565 N |
 |
4252-0097W |
PFS520SQ |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
1-1/8 |
6419 lbf, 28565 N |
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