MICRO SWITCH™ Environmentally Sealed Limit Switches
EN Series
003125
Datasheet
Issue 1
FEATURES
• Circuitry options from 1PST (one-pole single throw) circuit to
6PDT (six-pole double throw) circuits for position indication of
different independent circuits or providing redundant circuit
capabilities
• Rugged stainless steel housing and bushing
• All-metal drive train for consistent operating characteristics at
high or low temperatures
• Most EN catalog listings are MIL-PRF-8805 compliant for
stringent military and non-military applications
• MIL-PRF-8805 symbol 4 (resilient) sealing to keep dust, water,
and ice from entering the switch enclosure
• Gold-bifurcated, gold-plated, or silver-alloy switch contacts
for reliably controlling electrical loads from less than 0.5 A [low
energy/logic level] up to 15 A (power duty)
• Wide temperature range from -54 °C to 125 °C [-65 °F to
257 °F] for sea level or high altitude military or commercial
applications
• Assortment of switch actuators and electrical terminations
• Miniature package size [400EN Series and 600EN Series]
reduces housing diameter by 30 % for smaller space required
on equipment
DESCRIPTION
The Honeywell MICRO SWITCH™ Series of EN limit switches
are bushing mount designed, manufactured, and qualified to
MIL-PRF-8805 standards. These products provide a durable
switch for commercial and military aircraft as well as commercial
and military ground-based equipment. Other applications
include off-road equipment where severe environments are
encountered.
The EN Series of switches have proven to deliver consistent and
reliable operation in harsh environments on critical applications
for more than 65 years.
POTENTIAL APPLICATIONS
• Landing gear systems for commercial and military aircraft
including helicopters
- WOW switch (Weight-on-Wheels) for landing gear
- Up-lock and down-lock sensing
- Landing gear bay doors closed/locked
• External doors and hatches for commercial and military
aircraft including helicopters
- Closed and locked indication for passenger entry/exit doors,
cargo bay doors, and/or other doors or hatches (refueling
door, APU air inlet door)
• Military ground vehicles
- Doors or hatches closed/locked or open
• Off-road construction equipment
- Doors or panels present/closed/open
- Up-stop or down-stop limits
VALUE TO CUSTOMERS
• Precise and reliable position indication of critical applications
on aircraft and military systems
DIFFERENTIATION
• MICRO SWITCH™ EN Series’ products are highly
configurable; offering a variety of integral actuators, electrical
circuitries, and electrical terminations
PORTFOLIO
Honeywell offers many Series of MICRO SWITCH™ sealed
switches including the
HM Series, SE Series, XE Series,
HS Series, HE Series,
and
HR Series.
Sensing and Productivity Solutions
MICRO SWITCH™ Environmentally Sealed Limit Switches, EN Series
Table 1. Specifications
Characteristic
Description
Housing & bushing material
Contact material
Mechanical endurance
Electrical endurance
Circuitry
Electrical rating
Dielectric strength (initial)
Insulation resistance (initial)
Environmental sealing
Temperature range (std.)
Temperature range (opt.)
Shock
Vibration
Standards
Table 2. Electrical Ratings
Rating
Code
Parameter
Environmentally sealed military qualified limit switch series (MIL-PRF-8805)
300 Series stainless steel
Silver alloy, gold plated, gold bifurcated
25,000 cycles min.
25,000 cycles min. @ rated load
1PST (one-pole single throw) to 6PDT (six-pole double throw); reference Figure 2, page 3
Up to 15 A @ 28 Vdc; reference Table 2, page 2
1000 V RMS; 500 μA max. leakage
500 Vdc; 1000 Megohms min.
Symbol 4, resilient seal per MIL-PRF-8805
-54 °C to 85 °C [-65 °F to 185 °F]
-54 °C to 125 °C [-65 °F to 257 °F]
Symbol M (100 g) per MIL-PRF-8805
Symbol 1, 10 g peak (10 Hz to 500 Hz)
Design conforms to MIL-PRF-8805
Sea Level @ 28 Vdc
Inrush
Motor
Res.
Ind.
Inrush
Altitude 50,000 ft
Motor²
Res.
Ind.
A
B
C
D
E
F
1
24
36
30
24
–
N/A
4
6
5
4
4
4
10
15
5
1
7
2
3
10
3
0.5
4
24
36
30
–
N/A
4
6
5
–
4¹
10
15
1
2
3
10
0.5
2.5
4
7
5 A for rotary switches.
² Application information only.
²
APPLICATION INFORMATION ONLY
2
sensing.honeywell.com
MICRO SWITCH™ Environmentally Sealed Limit Switches, EN Series
STANDARD SWITCHES
(see pages 4 and 5)
While the standard EN Series provides a wide variety of products,
Honeywell offers a miniature EN Series and a special EN Series
per the following descriptions.
TERMINATION
Termination is specified in the order guides. Leadwires are
generally six feet long, and of the gage and military specifications
noted in the order guides.
MINIATURE SWITCHES
(see pages 6 through 8)
Miniature type EN switches meet the demand for smaller size
and lighter weight without sacrificing performance or electrical
capacity. These types are of the same construction, seal, and
materials as the standard size EN switches.
Type 400EN switches are directly interchangeable with their
standard size EN counterpart, yet the housings are smaller in
diameter and lighter in weight. The miniature-size housing is 7,92
mm [0.312 in] smaller in diameter, and the switch weighs 9,1 g
[0.3 oz] less.
MOUNTING
Plunger actuator switches mount through 5⁄8 in [Ø 0.625 in] or
15⁄32 in [Ø 0.469 in] holes. Lock washer, keyed washer, and wire
lock hexagon mounting nuts lock the switches in their mounting
holes.
Rotary-actuated switches mount through 15⁄32 in [Ø 0.469 in]
holes. A lock washer, wire lock hexagon nut, and locating pins on
the top of the housing prevent switch rotation.
Figure 1. Typical EN Switch Construction
SWITCHES WITH SPECIAL REQUIREMENTS
(see page 9)
High velocity actuation
This switch (1EN231-6) is designed to withstand near ‘‘hammer-
blow’’ actuation as is found in over-center locking mechanisms. It
is dimensionally interchangeable with standard listing 1EN1-6.
Low force operation
Special spring construction within this switch (1EN51-6) reduces
the normal 6 lb to 12 lb (26,7 N to 53,4 N) EN operating force to
3 lb to 6 lb (13,3 N to 26,7 N). This switch is also dimensionally
interchangeable with the standard size 1EN1-6.
Increased overtravel
A longer plunger and bushing on the switch (1EN61-6) extends
the EN overtravel capabilities from the normal 6,35 mm to
21,8 mm [0.25 in to 0.86 in]. The longer bushing also permits
additional adjustment of the plunger position or installations
where an increased bushing length is required.
High impact shock
Catalog listing, 1EN75-R3 (M8805/65-001), has been qualified
to MIL-PRF-8805, including high impact shock class H. Other
switches rated for high impact shock applications incorporate
the same plunger mechanism and internal switch design as
used in the 1EN75-R3 and are expected to conform to the same
requirements.
Figure 2. Circuitry Diagrams
Honeywell Sensing and Productivity Solutions
3
MICRO SWITCH™ Environmentally Sealed Limit Switches, EN Series
Table 3. EN Series Order Guide - Standard Series
Housing Diameter or
Length mm [in]
Ø 25,4
[1.0]
Ø 25,4
[1.0]
61,0
[2.4]
Ø 25,4
[1.0]
Ø 38,1
[1.50]
Ø 38,1
[1.50]
Ø 38,1
[1.50]
Ø 38,1
[1.50]
Ø 25,4
[1.0]
Ø 25,4
[1.0]
Ø 38,1
[1.5]
Ø 38,1
[1.50]
Ø 38,1
[1.50]
Bushing Thread Size
2PDT
Leadwire #20
AWG (side
exit) MIL-
DTL-22759/7
Screw (4-48
thread)
Connector
(side exit)
Connector
(bottom exit)
Leadwire #18
AWG (side
exit) MIL-
DTL-22759/7
Leadwire #18
AWG (side
exit) MIL-
DTL-22759/7
Leadwire #18
AWG (side
exit) MIL-
DTL-22759/7
Leadwire #20
AWG (side
exit) MIL-
DTL-22759/7
Leadwire #20
AWG (side
exit) MIL-
DTL-22759/7
Leadwire #20
AWG (side
exit) MIL-
DTL-22759/7
A [4 A]
1EN1-6
MS24331-1
(8805/40)
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
17,8 [4]
35,0
[1.38]
1,02
[0.040]
6,35
[0.250]
0,51
[0.020]
0.625-24
UNEF
24,9
[0.980]
2PDT
A [4 A]
1EN1-S
–
17,8 [4]
35,0
[1.38]
35,0
[1.38]
35,0
[1.38]
1,02
[0.040]
1,02
[0.040]
1,02
[0.040]
6,35
[0.250]
6,35
[0.250]
6,35
[0.250]
0,51
[0.020]
0,51
[0.020]
0,51
[0.020]
0.625-24
UNEF
0.625-24
UNEF
0.625-24
UNEF
38,2
[1.51]
27,9
[1.10]
53,3
[2.1]
2PDT
A [4 A]
1EN42-R
–
17,8 [4]
2PDT
PIN PLUNGER
A [4 A]
1EN43-R
–
17,8 [4]
2PDT
B [10 A]
2EN1-6
MS24331-2
(8805/40)
22,3 [5]
35,0
[1.38]
1,27
[0.050]
6,35
[0.250]
0,89
[0.035]
0.625-24
UNEF
38,1
[1.50]
1PDT-
DB
C [15 A]
3EN1-6
MS24331-3
(8805/40)
22,3 [5]
35,0
[1.38]
1,52
[0.060]
6,35
[0.250]
0,89
[0.035]
0.625-24
UNEF
33,3
[1.31]
2PDT-
DB
C [15 A]
4EN1-6
MS24331-4
(8805/40)
22,3 [5]
35,0
[1.38]
1,78
[0.070]
6,35
[0.250]
1,14
[0.045]
0.625-24
UNEF
43,2
[1.70]
4PDT
A [4 A]
5EN1-6
–
17,8 [4]
35,0
[1.38]
1,02
[0.040]
6,35
[0.250]
0,76
[0.030]
0.625-24
UNEF
30,5
[1.20]
BALL BEARING
PLUNGER
2PDT
A [4 A]
2001EN1-6
–
26,7 to
53,4
[6 to 12]
17,8 [4]
39,1
[1.54]
1,02
[0.040]
6,35
[0.250]
0,51
[0.020]
0.625-24
UNEF
24,9
[0.980]
2PDT
ROLLER PLUNGER*
A [4 A]
21EN9-6*
FAA-PMA
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
26,7 to
53,4
[6 to 12]
17,8 [4]
45,2
[1.78]
1,02
[0.040]
6,35
[0.250]
0,51
[0.020]
0.625-24
UNEF
24,9
[0.980]
2PDT
Leadwire #18
AWG (side exit) B [10 A]
MIL-W-22759/7
22EN9-6*
–
22,3 [5]
45,2
[1.78]
45,2
[1.78]
45,2
[1.78]
1,27
[0.050]
1,78
[0.070]
1,02
[0.040]
6,35
[0.250]
6,35
[0.250]
6,35
[0.250]
0,89
[0.035]
1,14
[0.045]
0,76
[0.030]
0.625-24
UNEF
0.625-24
UNEF
0.625-24
UNEF
38,1
[1.5]
43,2
[1.70]
30,5
[1.20]
Leadwire #18
2PDT-
AWG (side exit) C [15 A]
DB
MIL-W-22759/7
4PDT
Leadwire #20
AWG (side exit)
MIL-W-22759/7
A [4 A]
24EN9-6*
–
22,3 [5]
25EN9-6*
FAA-PMA
17,8 [4]
O.F.- Operating Force; R.F.- Release Force; F.P.-Free Position; P.T.-Pretravel; O.T.-Overtravel; D.T.-Differential Travel
* Roller plunger field adjustable in 45° increments.
** Reference Table 2, page 2, for additional detail.
4
sensing.honeywell.com
Replacement
Mounting Hardware
Packet
19PA8
19PA78-
EN
19PA78-
EN
19PA78-
EN
19PA8
19PA8
19PA8
19PA78-
EN
19PA8
19PA115-
EN
19PA115-
EN
19PA115-
EN
19PA115-
EN
Military Number or
Note
D.T. max. mm [in]
F.P. nom. mm [in]
P.T. max. mm [in]
O.T. min. mm [in]
Electrical Rating
Code**
Housing Height
mm [in]
Catalog Listing
R.F. min. N [lb]
Termination
O.F. N [lb]
Actuator
Circuitry
MICRO SWITCH™ Environmentally Sealed Limit Switches, EN Series
Table 3. EN Series Order Guide - Standard Series, continued
Housing Diameter or
Length mm [in]
Ø 25,4
[1.0]
Ø 25,4
[1.0]
Ø 38,1
[1.5]
Ø 38,1
[1.5]
Ø38,1
[1.5]
Ø 38,1
[1.5]
Ø 38,1
[1.5]
Ø 38,1
[1.5]
Ø 25,4
[1.0]
Ø 38,1
[1.5]
Ø 38,1
[1.5]
Bushing Thread Size
2PDT
Leadwire #20 AWG
(side exit)
MIL-W-22759/7
Leadwire #20 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit) MIL-
W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
Leadwire #20 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
Leadwire #18 AWG
(side exit)
MIL-W-22759/7
D [5 A]
31EN11-6
(CW)
31EN1-6
(CCW)
32EN11-6
(CW)
32EN1-6
(CCW)
34EN11-6
(CW)
34EN1-6
(CCW)
35EN27-4
(CW)
MS21320-1
(8805/48)
MS21320-2
(8805/48)
MS21320-3
(8805/48)
MS21320-4
(8805/48)
MS21320-7
(8805/48)
MS21320-8
(8805/48)
Gold-
bifurcated
contacts
FAA-PMA,
Gold-
bifurcated
contacts
MS24420-1
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,36 to
2,82 [12
to 25]
1,02 [9]
13°
45°
4°
0.469-32
UNS
0.469-32
UNS
0.469-32
UNS
0.469-32
UNS
0.469-32
UNS
0.469-32
UNS
0.469-32
UNS
54,8
[2.16]
54,8
[2.16]
68,6
[2.70]
68,6
[2.70]
71,6
[2.82]
71,6
[2.82]
60,7
[2.39]
2PDT
D [5 A]
1,02 [9]
13°
45°
4°
2PDT
ROTARY ROLLER LEVER
B [10 A]
1,02 [9]
20°
45°
6°
2PDT
B [10 A]
1,02 [9]
20°
45°
6°
2PDT-
DB
2PDT-
DB
C [15 A]
0,9 [8]
15°
45°
10°
C [15 A]
0,9 [8]
15°
45°
10°
2PDT
E [1 A]
1,02 [9]
20°
45°
6°
2PDT
E [1 A]
35EN24-4
(CCW)
1,02 [9]
20°
45°
6°
0.469-32
UNS
60,7
[2.39]
ROTARY LINKAGE LEVER
1
2PDT
A [4 A]
41EN1-6
1
0,34 [3]
–
Nom. 35° actuation
in 360° rotation
Nom. 35° actuation
in 360° rotation
Nom. 35° actuation
in 360° rotation
12°
0.469-32
UNS
0.469-32
UNS
0.469-32
UNS
26,7
[1.05]
42,7
[1.68]
46,2
[1.82]
2PDT
B [10 A]
42EN1-6
1
MS24420-2
0,56 [5]
–
12°
2PDT-
DB
C [15 A]
44EN1-6
1
MS24420-4
1,13 [10]
–
20°
O.T.- Operating Torque; R.T.- Release Torque; P.T.-Pretravel; T.T.-Total Travel; D.T.-Differential Travel
1
These rotary linkage lever switches are continous rotation CW or CCW.
** Reference Table 2, page 2, for additional detail.
Honeywell Sensing and Productivity Solutions
Replacement
Mounting Hardware
Packet
19PA10
19PA10
19PA10
19PA10
19PA10
19PA10
19PA10
19PA10
19PA10
19PA10
19PA10
R.T. min. Nm [in-lb]
P.T. degrees [nom.]
T.T. degrees [nom.]
Military Number or
Note
D.T. max. degrees
Electrical Rating
Code**
Housing Height
mm [in]
Catalog Listing
O.T. Nm [in-lb]
Termination
Actuator
Circuitry
5
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