Stearns 1-087-8XX Catalog Page

Series 87,800 (1-087-8XX)
Division 2 Hazardous Location

Mounting Face: NEMA 182TC 184TC, 213TC, 215TC, 254TC, 254UC,
256TC and 256UC

8.5” AK, 7.25” AJ

Static Torque: 6 through 105 lb-ft

Enclosure Material: Cast Iron

Release Type: Knob

Enclosure Protection: Type 4/IP 56

Division 2 Hazardous Duty

Certified: UL Listed, File E-14893.
For Hazardous Location Classification, see
Dimensional Data below.

Mounting Requirements: 1-87-8XX Series
Hazardous Location Motor Mounted Brake
is recommended for mounting close coupled
to the motor end bell. The acceptability of
the brake and motor combination must be
determined by Underwriters Laboratory.

Modification required for vertical above
mounting. For vertical below, modification
required on 50-105 lb-ft.

Epoxy Encapsulated Coil Construction, with
Class H Insulation

NC Thermostat

Maximum speed:

Horizontal 4000 rpm
Vertical 3000 rpm

ABS Type Approval Certified

Installation, Service & Parts List:
P/N 8-078-927-08

Brake set and release times, when brake
and motor are switched separately (

definitions, see page 101):

Static Torque Coil Size T1 T2

10, 15, 25, 50 5 & 6 42 20

35, 75, 105 8 48 20

BACK TO TABLE OF CONTENTS

for T1/T2

42

Dimensional Data

Model

Numbers

1-087-802-00

1-087-802-01

1-087-812-00

1-087-812-01

1-087-822-00

1-087-822-01

1-087-832-00

1-087-832-01

1-087-842-00

1-087-842-01

1-087-852-00

1-087-852-01

1-087-862-00

1-087-862-01

1-087-882-00

1-087-882-01

Nominal Static

Torque

lb-ft

(Nm)

(14)

(14)

(20)

(20)

(34)

(34)

(47)

(47)

(68)

(68)

(102)

(102)

105

(142)

105

(142)

(8)

(8)

10

10

15

15

25

25

35

35

50

50

75

75

Dimensions for estimating only. For installation purposes request certified prints.

Hazardous Location

Classification Division 2

Class I

Group -

6

6

A, B, C, D F, G

A, B, C, D F, G

A, B, C, D F, G

A, B, C, D F, G

A, B, C, D F, G

A, B, C, D F, G

A, B, C, D F, G

A, B, C, D F, G

Class II
Group -

F, G

F, G

F, G

F, G

F, G

F, G

F, G

F, G

AAEAGC

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

7.56

(192.02)

8.56

(217.42)

8.56

(217.42)

Dimensions in Inches

(Dimensions in Millimeters)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

1.81

(45.97)

2.31

(58.67)

2.31

(58.67)

2.31

(58.67)

2.31

(58.67)

2.81

(71.37)

2.81

(71.37)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.78

(19.81)

.97

(24.64)

.97

(24.64)

.97

(24.64)

.97

(24.64)

.97

(24.64)

.97

(24.64)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.00

(25.4)

1.50

(38.10)

1.50

(38.10)

1.50

(38.10)

1.50

(38.10)

2.00

(50.80)

2.00

(50.80)

Enclosure

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

IP 56

Wt.
lbs

(kg)

42

(19.1)

42

(19.1)

42

(19.1)

42

(19.1)

43

(19.5)

43

(19.5)

43

(19.5)

43

(19.5)

46

(20.9)

46

(20.9)

42

(19.1)

42

(19.1)

50

(22.7)

50

(22.7)

50

(22.7)

50

(22.7)

Series 87,800 continued

BACK TO T ABLE OF CONTENTS

Motor Frame Adapters:

WARNING! Before selecting an adapter to mount a brake on a larger motor
frame, the torque and thermal capacity required by the application should be
determined as shown in the “Selection Procedure” section. A larger motor may
indicate a requirement for greater thermal capacity than the brake is designed
for. The brake selection must be matched to the motor and application
requirements, before use of an adapter is considered.

To Adapt
to NEMA

Frame Size

56C, 143TC

or 145TC

284 TC or

286TC

324TC,
326TC,
364TC,
365TC,

404TC or

For adapter dimensions, see Technical Data.

AK

Dim.

in.

(mm)

4.50

(114.30)

10.50

(266.70)

12.50

(317.50)

Reg.

No.

Brake endplate is modified
for 4.50 in. AK. An adapter
is not furnished.
Add: $340.00

-05

-11 5-55-7055-00

-13 5-55-7046-00

Adapter

Stock

Number

5-55-7043-00

Additional Shaft

Length Required

in.

(mm)

—

(—)

.56

(14.22)

.81

(20.64)

.88

(22.22)

Current Ratings (amperes)

Coil
Size

5

6

8

Voltage: 60 Hz Voltage: 50 Hz

AC

Current

holding

holding

holding

115 200 230 400 460 575 110 220 380

inrush

7.5

4.3

3.7

2.2

1.9
.1

3.2
.2

4.2
.3

1.5
.09

2.6
.1

3.5
.3

inrush

inrush

.5

13.0
.6

17.6

1.2

.3

7.5
.4

10.3
.7

.2

6.5
.3

8.8
.6

.1

3.7
.2

5.0
.3

5.4
.3

9.4
.5

15.4
.1

4.0
.25

5.6
.3

7.7
.5

1.9
.1

3.2
.2

4.2
.3

Engineering Specifications

Nominal

Static

Torque

(Nm)

(102)
(142)

1

Maximum solenoid cycle rate is based on ambient temperature of 104°F

(40°C) with 50% duty cycle. Does relate to brake cycle rate (see Thermal
Capacity).

2

Thermal capacity rating is based on ambient temperature of 104° (40°C), stop

time of ne second or less, with no heat absorbed from motor. Derate thermal
capacity by 25% for vertical mounting. Refer to Selection Procedure Section.

lb-ft

(8)

10

(14)

15

(20)

25

(34)

35

(47)

50

(68)

75

105

No. of

Friction

Discs

6

1 5 4
1 5 4
1 6 4
1 6 4
1 8 4
2 6 4
2
3

Coil
Size

8
8

Maximum

Solenoid

Cycle Rate

cycles/

min

4
4

Thermal

Capacity 2

1

hp-sec/min

(watts)

14

(174)

14

(174)

14

(174)

14

(174)

14

(174)

14

(174)

14

(174)

14

(174)

Inertia (Wk2)

2

lb-ft.

(kgm2 x 10-4)

.048

(20.34)

.048

(20.34)

.048

(20.34)

.048

(20.34)

.048

(20.34)

.089

(37.40)

.089

(37.40)

.129

(54.45)

Ordering and Identification Information

The following example and tables provide information for
selecting the appropriate three-letter suffix when ordering
a Stearns Brake.

Example of a complete part number:
1-087-832-01-ELF Lead wire position (internal and

external, left and right)
460 Vac
1-1/8 bore and 1/4 x 1/8 keyway

Hub Selection

Bore

Character

A*
B*
C*

D

E

F
G
H

I*

K*

L*

M*
N*

O*
P*
Q*

R*
S*
T*
U*

Maximum allowable bore 1.625.

1-1/16
1-7/16

1-3/16
1-5/16

Z

* These bores are non-standard.

Keyseats made to ANSI B17.1 standard.

**

Standard AC
Voltage Ratings

Character Voltage Hz

B 115 60
D 110 50
E 200 60
F
H 220 50
L
M 415 50
N 575 60
O 110/220 50
P 115/230 60

230/460

Q
R 200/400 60

Modifications are available- see SAB Modification Section

Optional Space Heater for Class II Brakes only

(in.)

5/8
5/8
3/4
7/8

1-1/8
1-1/4
1-3/8
1-5/8

1-3/4

1/2

1

1-1/2

9/16

11/16

13/16
15/16

.600

230
190

460
380

230

Keyway**

(in. x in.)

1/8 x 1/16
3/16 x 3/32
3/16 x 3/32
3/16 x 3/32

1/4 x 1/8
1/4 x 1/8

5/16 x 5/32

3/8 x 3/16

3/8 x 3/16

1/8 x 1/16

1/4 x 1/8

3/8 x 3/16

1/8 x 1/16
3/16 x 3/32

1/4 x 1/8

3/8 x 3/16
3/16 x 3/32

1/4 x 1/8
1/4 x 1/8

5/16 x 5/32

pilot bore

60
50

60
50

60
50

43