Namco Controls EA780, EA790 Catalog Page
Double Pole
Harsh Environment/
Butt/
Limit
Sliding
Navy Marine
Switches
NAVY meets MIL-C-2212F
Current
Construction - Completely fabricated
from non-corrosive materials, its bronze
housing and high quality stainless steel
shaft insure against external damage to
the switch from salt spray corrosive
elements. Sealing against leakage is
Limit Switches
achieved through the use of high quality
gaskets on machined surfaces and “O”
ring protection, plus close tolerance
between the shaft and bushing.
Durability - All internal components are
of high grade stainless steel or copper
alloy, chrome plated when required, to
protect against bearing surface wear and
to provide millions of operations.
Contacts
Both the EA780 and EA790 series
switches have heavy duty electrical
contacts. The EA780 switches have
sliding, double-break type contacts built
to meet the high shock requirements
outlined in MIL-S-901.
EA790 switches have heavy duty,
double-break, butt type contacts.
Contacts - EA780 switches contain
sliding contact arrangements which wipe
clean with each operation.
EA790 switches contain butt-style
contacts.
Both series available with operation
direction CW, CCW or CW/CCW.
Levers - A variety of corrosion resistant
levers are available to meet specific
actuating requirements.
NOTE: Levers must be ordered as
separate items. See Operating Levers
Section.
EA780 Double Pole 2 N.O. - 2 N.C. / Sliding Contacts / Cam Action
Standard Wide Long A B C D E F
Mounting Mounting Mounting Dir. Of Trip Reset Recom. Total Min. Travel Overall Torque Contact Data
Model No. Model No. Model No. Operation Travel Travel Travel Travel to Maintain Travel (inch lbs) Config. Drawing
STANDARD TRAVEL
EA780-20000 EA780-50000 EA780-80000 CW 18° 14° 30° 90 ° --27A1
EA780-20001 EA780-50001 EA780-80001 CCW 18° 14° 30° 90 ° --27B1
EA780-20100 EA780-50100 EA780-80100 CW/CCW 18° 14° 30 ° 90° --27C1
MAINTAINED CONTACT & LEVER POSITION
— EA780-56000 —
MAINTAINED CONTACT-LEVER RETURNED
EA780-26700 EA780-56700 EA780-86700
See Operating Levers Section
CCW 25° 25° 60° 124° 54° 56° 9
CCW 16° 30° 45° 90 ° 26° - 16.5
Angle Angle Angle Angle Angle Angle
CW 55 ° 22° 60° 116° 55° 64° 6
CW 30 ° 26° 45 ° 90 ° 30° -15
D2
D3
274
Namco Controls Corporation • Mayfield Village, OH 44143 • (440) 460-1360 • Fax: (440) 460-3800
EA790 Double Pole 2 N.O. - 2 N.C. / Butt Contacts / Cam Action
Standard Wide Long A B C D E F
Mounting Mouning Mounting Dir. Of Trip Reset Recom. Total Min. Travel Overall Torque Contact Data
Model No. Model No. Model No. Operation Travel Travel Travel Travel to Maintain Travel (inch lbs) Config. Drawing
STANDARD TRAVEL
EA790-20000 EA790-50000 EA790-80000 CW 18° 14° 30° 90° --27A1
EA790-20001 EA790-50001 EA790-80001 CCW 18° 14° 30° 90° --27B1
EA790-20100 EA790-50100 EA790-80100 CW/CCW 18° 14 ° 30° 90° --27C1
MAINTAINED CONTACT & LEVER POSITION
EA790-26000 EA790-56000 EA790-86000
MAINTAINED CONTACT-LEVER RETURNED
EA790-26700 EA790-56700 EA790-86700
SHORT TRAVEL
EA790-20900 EA790-50900 EA790-80900 CW/CCW 13° 10 ° 30° 90° --27
NEUTRAL POSITION ALL CONTACTS OPEN
EA790-25102 EA790-55102 EA790-85102
NEUTRAL POSITION ALL CONTACTS CLOSED
EA790-25104 EA790-55104 EA790-85104
CCW 25° 25° 60° 124° 54° 56 ° 9
CCW 16° 30° 45° 90° 26° - 16.5
CCW 31° 22° 45° 90° - - 16.5
CCW 31° 22° 45° 90° - - 16.5
Angle Angle Angle Angle Angle Angle
CW 55° 22° 60° 116° 55° 64° 6
CW 30° 26° 45° 90° 30° -15
CW 31° 12° 45° 90° - - 16.5
CW 31° 12° 45° 90° - - 16.5
EA780/EA790
D2
D3
C1
E1
F1
Limit Switches
Common Switch Characteristics
DOUBLE POLE, HARSH ENVIRONMENT/NAVY MARINE,
BUTT/SLIDING CONTACTS
EA780 EA790
NEMA Enclosure Type 1, 4, 4X, 6, 6P, 13
Housing Material Bronze
Ambient Temperature Range* -20°C to +90°C
Shipping Weight 4 lbs. approx.
Lever Adjustment 7°30’ Increments thru 360°
Contacts
Special Switch Features MIL-C-2212F
*Some high temperature (0°C to 150°C) and low temperature
(-40°C to +90°C) versions available. Contact factory.
Sliding, Silver Alloy Butt, Silver Alloy
Form Z Form Z
Watertight (3 ft. for 60 min.) and
Submersible (15ft. for 30 min.)
per MIL STD-108E
Vibration requirements
per MIL-STD-167B, Type 1
High Shock per MIL-S-901,
grade A, Class 1, type A
EA780
Continuous Current Rating - Amperes
VOLTAGE AC DC
125 10.0 2.5
250 7.5 .75
480 5.0 600 2.5 -
75-100% Power Factor
EA790
Continuous Current Rating - Amperes
VOLTAGE AC DC
125 20.0 5.0
250 15.0 1.5
480 10.0 600 5.0 -
75-100% Power Factor
Namco Controls Corporation
Mayfield Village, OH 44143
(440) 460-1360 • FAX (440) 460-3800 • namcocontrols.com
For technical assistance, call 1-800-NAMTECH
275
Double Pole
Harsh Environment/
Butt/
Limit
Sliding
Navy Marine
Contact Configurations
CIRCUIT A
CIRCUIT B
Limit Switches
CIRCUIT C
CIRCUIT D
CIRCUIT E
CIRCUIT F
CW
CW
CW
CW
CW
CW
CW
Switches
Initial
H
F
D
B
Initial
H
F
D
B
Initial
H
F
D
B
CCW Operating
Initial
H
F
D
B
CW Operating
Initial
H
F
D
B
Initial
H
F
D
B
Initial
H
F
D
B
CCW
G
E
C
A
CCW
G
E
C
A
CCW
G
E
C
A
CCW
G
E
C
A
CCW
G
E
C
A
CCW
G
E
C
A
CCW
G
E
C
A
Contacts
Operational Data Drawings
DRAWING #1
C
C
A
A
B
D
DRAWING #2
CCW Operating CW Operating
Initial
Position
C
A
E
D
To change switch operation from CW operating to CCW
operating, operate switch through angle E. Remove lever and
reset at initial position.
DRAWING #3
CCW Operating CW Operating
Initial
Position
E
C
D
To change switch operation from CW operating to CCW
operating, operate switch through angle E.
A
F
B
B
D
B
D
D
Initial
Position
F
Initial
Position
B
E
A
C
B
D
E
C
A
D
276
Namco Controls Corporation • Mayfield Village, OH 44143 • (440) 460-1360 • Fax: (440) 460-3800
EA780/790 Series Drawings
STANDARD MOUNTING PLATE
0.44"
(11.2)
0.92"
(23.4)
3.19"
(81.0)
0.50"
(12.7)
0.68"
(17.3)
48 Serrations
Equally Spaced
0.495/0.490 O.D.
1.31"
(33.3)
1.06"
(26.9)
EA780/EA790
(66.8)
7.06"
(179.3)
0.125"
2.63"
(3.2)
1/4–20 Thd.
0.38 Deep
Four Holes
1.59"
(40.4)
2.60" Max.
(66.0)
1-11 1/2 NPT
Pipe Tap
1.12"
(28.4)
2.25"
(57.2)
2.28"
(57.9)
4.94"
(125.5)
(0.51)
0.81"
(20.6)
0.02"
WIDE MOUNTING PLATE LONG MOUNTING PLATE
0.260/0.255 Dia.
Four Holes
0.53"
(13.5)
0.28"
(7.1)
4.38"
(111.3)
0.66"
(16.8)
0.260/0.255 Dia.
Four Holes
0.41"
(10.4)
6.41"
(162.8)
Limit Switches
2.81"
(71.4)
3.25"
(82.6)
4.94"
(125.5)
0.22"
(5.6)
Dimensions: inches/(mm)
7.06"
(179.3)
2.25"
(57.2)
1.81"
(46.0)
0.22"
(5.6)
Namco Controls Corporation
Mayfield Village, OH 44143
(440) 460-1360 • FAX (440) 460-3800 • namcocontrols.com
For technical assistance, call 1-800-NAMTECH
277
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