W.C. Branham - Pneumatic Spring Applied Wind Turbine Brakes

W.C. Branham brings spring applied caliper disc brakes from the factory floor to towering wind turbines.

As part of over-speed protection, spring applied brakes have the ability to stop the wind turbine rotor in harsh conditions.

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.

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.

Specifications

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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.

Choose from: All, PFS47, PFS200 <16" Disc Dia., PFS200SUL Unlimited Disc Dia., PFS200EP, PFS200DUL Unlimited Disc Dia., PFS400, PFS400EP, PFS520 or PFS522 Series

Products Available

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
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
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
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