Stearns 1-056-8XX Catalog Page

Series 56,800 (1-056-8XX)

Division 2 Hazardous Location
Mounting Face: NEMA 56C, 143TC and 145TC

4.5” AK, 5.88” AJ

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Static Torque: 1.5 through 25 lb-ft
Enclosure Material: Cast Iron
Release Type: Side Lever, maintained with

auto reset

Enclosure Protection: Type 4/IP 56
Certified: UL Listed, File E 14893 for

Class 1, Division 2, Groups A, B, C, D, and
Class II, Division 2, Groups F and G

Mounting Requirements: 1-056-8X2 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.

Universal Mounting: Through 15 lb-ft.
20 and 25 lb-ft. supplied with springs for
vertical modification.

Epoxy Encapsulated Coil Construction,
with Class H Insulation

NC Thermostat

Maximum speed:
Horizontal 5000 rpm
Vertical 3600 rpm

Installation, Service and Parts List:
P/N 8-078-905-18

ABS Type Approval Certified
Brake set and release times in

milliseconds, when brake and motor are
switched separately (for T1/T2 definitions,

see page 101):

Static

Torque

1.5 - 25

Coil Size T1 T2

4, K4,

K4+, M4+

25 14

40

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

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

182TC
184TC
213TC
215TC
254TC
256TC

For adapter dimensions, see Technical Data.

AK

Dim.

in.

(mm)

8.50

(215.90)

8.50

(215.90)

Reg.

No.

Brake

Torque

Adapter

Stock

Number

5-55-5041-001.5-6-9

5-55-5043-0010-25-9

Additional

Shaft Length

Required

in.

(mm)

.94

(23.81)

.94

(23.81)

Dimensions

Model

Number

1-056-812-00

1-056-822-00

1-056-832-00

1-056-842-00

1-056-852-00

1-056-862-00

Static Torque

Nominal

(lb-ft)

(Nm)

3

(4)

6

(8)

10

(14)

15

(20)

20

(27)

25

(34)

Dimensions in Inches

(Dimensions in Millimeters)

AAGCG

4.7

.59

1.18

(119.4)

4.7

(119.4)

4.7

(119.4)

4.7

(119.4)

4.7

(119.4)

4.7

(119.4)

(15.0)

.59

(15.0)

.59

(15.0)

.59

(15.0)

.59

(15.0)

.59

(15.0)

(30.0)

1.18

(30.0)

1.18

(30.0)

1.18

(30.0)

1.18

(30.0)

1.18

(30.0)

1.66

(42.2)

1.66

(42.2)

1.66

(42.2)

1.66

(42.2)

1.66

(42.2)

1.66

(42.2)

Enclosure

IP 56 15

IP 56 15

IP 56 17

IP 56 17

IP 56 21

IP 56 21

Wt.
lbs

(kg)

Series 56,800 continued

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Engineering Specifications

lb-ft

1.5

(2)

(4)

(8)

10

(14)

15

(20)

20

(27)

25

(34)

3

6

No. of Friction

Discs

1 4 7.5

2 4 7.5

2 4 7.5

2 K4 7.5

2 K4+ 7.5

3 K4+ 7.5

3 M4+ 7.5

Coil
Size

AC

Maximum

Cycle Rate 1

cycle/min

Solenoid

AC Horizontal

Thermal

Capacity 2
hp-sec/min

(watts)

3.5

(43.50)

3.5

(43.50)

3.5

(43.50)

3.5

(43.50)

3.5

(43.50)

3.5

(43.50)

3.5

(43.50)

Inertia (Wk2)

2

lb-ft

(kgm2 x 10-4)

.008

(3.36)

.014

(5.88)

.014

(5.88)

.014

(5.88)

.014

(5.88)

.020

(8.40)

.020

(8.40)

Nominal

Static

Torque

(Nm)

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°F (40°C), stop

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

Current Ratings (amperes)

Solenoid
Coil Size

4

K4
K4+
M4+

AC

Current

Inrush

Holding

Inrush

Holding

Inrush

Holding

Inrush

Holding

Voltage: 60 Hz

200

115

Vac

Vac

2.1

3.6
.2

.3

2.5

4.3
.2

.3

2.5

4.6
.2

.4

2.5

4.6
.2

.4

230
Vac

1.8
.2

2.2
.2

2.3
.2

2.3
.2

400
Vac

1.1
.08

1.3
.1

1.2
.1

1.2
.1

460
Vac

.9
.08

1.1
.08

1.0
.1

1.0
.1

575
Vac

.7
.06
.9
.07
.9
.08
.9
.08

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: 1-056-832-00-BFF Lead wire position (internal and external, left and right)

230 Vac
5/8 bore and 3/16 x 3/32 keyway

Voltage: 50 Hz

220

110

Vac

Vac

2.1

4.1
.2

.3

1.9

3.8
.2

.4

2.0

4.9
.2

.4

2.0

4.1
.2

.4

380
Vac

.9
.08

1.1
.08

1.0
.1

1.3
.1

Hub Selection

Bore

Character

A*

B
C
D
E

F*

K

L*
N*
O*
P*
R*
S*

Maximum allowable bore 1.25.
For thru-shaft applications, .875
is maximum.

(in.)

5/8
5/8
3/4

7/8
1-1/8
1-1/4

1/2

1

9/16

11/16

1-1/6

13/16
15/16

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

1/8 x 1/16

1/4 x 1/8

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

1/4 x 1/8

3/16 x 3/32

1/4 x 1/8

* 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

230

F

190

H 220 50

460

L

380

M 415 50
N 575 60
O 110/220 50

115

P

230

230/460

Q

190/380

R 200/400 60

DC voltages not available.

Modifications are available- see SAB Modification Section

60
50

60
50

60

60

Space heater not available.

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