Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
Type 304 and 304L Electrical Position
Switches
The Type 304 and 304L electrical position switches
are normally mounted on a control valve actuator to
operate alarms, signal lights, relays, motors,
solenoid valves, or other equipment when valve
travel reaches predetermined points.
The Type 304 position switch (see figure 1) is for
applications that require only one or two switches.
The Type 304L position switch is for applications
that require three or more switches with a maximum
of six switches. The individual switches can be
adjusted to operate at any point of travel within the
90 degrees of cam rod rotation.
W5939 / IL
Figure 1. Type 304 Electrical Position Switch
with Cover Removed
When the position switch is used with sliding-stem
valves, the operating arm (see figure 2) converts
linear valve travel to rotary motion of the cam rod.
When the position switch is used on many of the
rotary shaft actuator applications, a coupler links the
position switch and actuator directly.
Use of the Type 304 and 304L position switches is
not limited to FisherR actuators or equipment. The
position switches can be used wherever linear or
rotary motion can be transmitted to them.
Note
D Protection From Harsh Environments—
Housing meets CSA Enclosure 4 and NEMA 4X
specifications.
D Easy to Adjust— Point of actuation of each
switch is easily adjusted by rotating the cam on the
cam rod; a spring washer retains the cam in the
desired position.
D Application Versatility— The switch mounts
on most Fisher sliding stem or rotary actuators, or on
other mechanical devices. Switch ratings (see tables
2 and 3) are compatible with a variety of power
supplies and loads. The switches can be wired either
normally open or normally closed.
D Easy Maintenance— The position switch is
screwed to its mounting and coupled to the device.
Also, individual switches can be removed from the
housing without removing the position switch
housing from its mounting.
D200068X012
Neither Emerson, Emerson Process
Management, nor any of their affiliated
entities assumes responsibility for the
selection, use, or maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end-user.
Features
www.Fisher.com
Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
Specifications
Operative Temperature Range
Available Configurations
J Type 304 Switch: Unit contains one or two
switches
J Type 304L Switch: Unit contains three, four,
five, or six switches
Maximum Cam Rotation
90 degrees between point of actuation of first
switch and point of actuation of last switch
−40 to +82°C (−40 to +180°F)
Construction Materials
Base and Cover: Aluminum
Cams and Cam Rod: Stainless steel
Operating Arm: Plated steel
Flexible Coupling: Polyurethane and steel hub
Cam Gears: Plated steel
O-Rings: Nitrile
Adjustment
Point of activation of each switch is adjusted by
rotating the cam with the geared nut (see figure 2)
Switch Type
Single-pole, double-throw
Mounting
Parts are available for mounting on most Fisher
actuators
Switch Electrical Ratings
Service Ratings (when wired at the factory):
See tables 2 and 3.
Maximum Continuous Current: 20 amperes
Maximum Inrush Current: 30 amperes with
normally-closed contacts; 25 amperes with
normally-open contacts
Electric Motor Rating: Capable of switching a
3/4 horsepower electric motor at 125 VAC or a
1-1/2 horsepower motor at 250 VAC
Hazardous Area Classification
Conduit Connection
With Bushing: 3/4 NPT internal connection
accepts a maximum of six 14-gauge wires
Without Bushing: 1-1/4 NPT internal connection
accepts a maximum of eighteen 14-gauge wires
For Explosion Proof Installation: Appropriate
conduit seal is required 460 mm (18-inches) from
housing
Approximate Weight
Type 304 Switch (with two switches and
cover): 2.3 kg (5 pounds)
Type 304L Switch (with six switches and long
cover): 4.5 kg (10 pounds)
Explosion proof,
Explosion proof
Options
APPROVED
Refer to table 1 for additional information
Terminal strip(s)
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 − Process Instrument Terminology.
Table 1. Hazardous Area Classifications—CSA (Canada) and FM (United States)
CERTIFICATION
BODY
CSA
FM
2
CERTIFICATION OBTAINED
(Explosion Proof)
Class/Division
Class I, Division 1 GP C,D
(Explosion Proof)
Class/Division
Class I, Division 1 GP C,D
TEMPERATURE CODE
ENCLOSURE RATING
T5 (Tamb = 82°C)
CSA ENC 4X
T5 (Tamb = 82°C)
NEMA 4X
Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
SWITCH 1 ACTUATES AT VALVE
CLOSED POSITION
OPERATING
ARM
ACTUATOR
STEM UP
2
OPTIONAL SWITCHES
ARE SET AS REQUIRED
CAM
GEARED
NUT
CAM
ROD
1
TERMINAL STRIPS
ARE OPTIONAL
ACTUATOR
STEM DOWN
NOTES:
1 SWITCHES ACTUATE AS ACTUATOR STEM TRAVELS DOWN OR AS ROTARY
VALVE SHAFT ROTATES COUNTERCLOCKWISE.
2 SWITCH FARTHEST FROM BASE ACTUATES AT FULLY OPEN VALVE POSITRON,
UNLESS SPECIFIED OTHERWISE.
42A0105-D
A1313-4 / IL
Figure 2. Cam and Switch Details
Table 2. Direct-Current Service Ratings
NON-INDUCTIVE
DIRECT
CURRENT
Heater
Load
Volts
Normally
Open
Contact
Amperes
Normally
Closed
Contact
Amperes
6-8
12-14
24-30
110-115
220-230
15
15
6
0.4
0.2
20
20
6
0.4
0.2
INDUCTIVE
Lamp Load
(Tungsten)
Normally
Normally
Open
Closed
Contact
Contact
Amperes
Amperes
1.5
1.5
1.5
0.4
0.2
3
3
3
0.4
0.2
Motor, Relay, or
Solenoid Load
Normally
Normally
Closed
Open
Contact
Contact
Amperes
Amperes
20
10
5
0.05
0.03
15
10
5
0.05
0.03
Table 3. Alternating-Current Service Ratings
ALTERNATING
CURRENT
HEATER
LOAD
Volts
Normally
Open
Contact
Amperes
Normally
Closed
Contact
Amperes
110-125
220-250
440-480
20
20
20
20
20
20
LAMP LOAD
(TUNGSTEN)
Normally
Normally
Open
Closed
Contact
Contact
Amperes
Amperes
2.5
1.25
0.75
3
2.5
1
MOTOR, RELAY, OR
SOLENOID LOAD
Normally
Normally
Open
Closed
Contact
Contact
Amperes
Amperes
15
15
2.5
15
15
2.5
3
Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
44
(1.75)
35
(1.35)
1
2
33
(1.28)
117
(4.63)
130 DIA
(5.12)
11
(0.44)
73
(2.88)
1/4-INCH 20 UNC
4 HOLES
1 1/4 NPT
REAR VIEW
3
SIDE VIEW
mm
(INCH)
NOTES:
1
TYPE 304 SWITCH COVER SIZE 184 mm (7.25 INCHES).
TYPE 304L SWITCH COVER SIZE 251 mm (9.88 INCHES).
2
SWITCH COVER REMOVAL CLEARANCE:
SFOR TYPE 304 SWITCH COVER, 95 mm (3.7 INCHES).
SFOR TYPE 304L SWITCH COVER, 165 mm (6.5 INCHES).
3
CONDUIT BUSHING PROVIDES 3/4 NPT OPENING.
22A2326-C
B0682-3 / IL
Figure 3. Exterior Dimensions
Installation
Complete mounting parts are available for mounting
on most Fisher actuators. For other applications,
provide suitable mounting parts to transmit input
motion to the cam rod. Electrical connections are
made directly to individual switches if the unit is not
equipped with the optional terminal strip. Or, the
connections are made to the optional terminal strip
that is factory wired to the switches. The individual
switches or optional terminal strip are marked so the
switch circuits can be wired for normally-open or
normally-closed operation. A suitable conduit
connector should be installed in the conduit
connection. Dimensions are shown in figures 3, 4,
and 5 and tables 4 and 5.
3. If the 304 switch is ordered mounted on a control
valve assembly, the cam and switch nearest the
switch base (switch 1) are adjusted at the factory so
that this switch actuates at the valve closed position.
For units with two switches, the switch farthest from
the base actuates at the valve fully open position. If
other action is desired, or if three or more switches
are ordered, specify the valve travel at which these
switches are to actuate.
4. Optional terminal strip if desired.
Note
Ordering Information
When ordering, please specify:
1. Number of individual switches desired.
2. If mounting parts for a Fisher actuator are
ordered, specify actuator type, size, and travel.
4
Neither Emerson, Emerson Process
Management, nor any of their affiliated
entities assumes responsibility for the
selection, use, or maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end-user.
Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
Table 4. Dimension A for Sliding-Stem Valves (see figure 4)
DIMENSION A, mm
ACTUATOR
350 and
470 Series
SWITCH
TYPE
DIMENSION A, INCHES
Actuator Size
304
236
40, 43,
46
256
304L
303
322
30
60, 63,
64, 68
260
80, 86,
100, 130
298
327
365
Actuator Size
−−−
−−−
−−−
−−−
9.31
40, 43,
46
10.06
−−−
−−−
11.94
12.69
30
Actuator Size
304
40, 43,
46
264
304L
353
Type 478
60, 64
68
−−−
−−−
−−−
260
282
−−−
−−−
−−−
40, 43,
46
10.38
−−−
−−−
−−−
327
331
−−−
−−−
−−−
13.88
−−−
−−−
10.25
11.12
−−−
−−−
−−−
12.88
13.25
−−−
−−−
−−−
Actuator Size
60, 68
80, 100
−−−
−−−
−−−
−−−
60, 68
80, 100
−−−
−−−
−−−
−−−
304
260
298
−−−
−−−
−−−
−−−
10.25
11.75
−−−
−−−
−−−
−−−
304L
327
365
−−−
−−−
−−−
−−−
12.88
14.38
−−−
−−−
−−−
−−−
Actuator Size
20, 32
−−−
−−−
−−−
−−−
−−−
20, 32
−−−
−−−
−−−
−−−
−−−
304
362
−−−
−−−
−−−
−−−
−−−
14.25
−−−
−−−
−−−
−−−
−−−
304L
402
--
−−−
−−−
−−−
−−−
15.81
−−−
−−−
−−−
−−−
−−−
Actuator Size
25, 50
100
−−−
−−−
−−−
−−−
25, 50
100
−−−
−−−
−−−
−−−
304
248
289
−−−
−−−
−−−
−−−
9.75
11.38
−−−
−−−
−−−
−−−
304L
314
356
−−−
−−−
−−−
−−−
12.38
14.00
−−−
−−−
−−−
−−−
304
254
40, 45,
46
256
304L
319
322
30, 34
Actuator Size
50, 60
70
80
87
30, 34
260
319
302
298
10.00
40, 45,
46
10.06
327
388
368
365
12.56
12.69
Actuator Size
Type 1250
and 1250R
−−−
−−−
Actuator Size
657 and
667 Series
14.38
−−−
68
Actuator Size
Type 585
and 585R
12.88
−−−
60, 64
Actuator Size
Type 513
and 513R
80, 86,
100, 130
11.75
Actuator Size
Actuator Size
Type 478-16
60, 63,
64, 68
10.25
304
225,
450
265
304L
288
50, 60
70
80
87
10.25
12.56
11.88
11.75
12.88
15.19
14.50
14.38
Actuator Size
675
−−−
−−−
−−−
−−−
−−−
225,
450
10.42
11.33
−−−
−−−
−−−
−−−
−−−
13.05
13.96
−−−
−−−
−−−
−−−
675
−−−
−−−
−−−
−−−
332
−−−
−−−
−−−
355
−−−
−−−
−−−
A
187
(7.38)
A
21A8707-B
15A6785-A
A2313-1 / IL
SWITCH MOUNTED ON
TYPE 657 ACTUATOR
CONDUIT CONNECTION
SWITCH MOUNTED ON
TYPE 513 ACTUATOR
mm
(INCH)
Figure 4. Dimensions When Used With Actuators Mounted on Sliding Stem Valves (see table 4)
5
Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
A
A
SWITCH MOUNTED ON
TYPE 1051 ROTARY ACTUATOR
SWITCH MOUNTED ON
TYPE 1061 ROTARY ACTUATOR
A
165.1
(6.50)
A
SWITCH MOUNTED ON
TYPE 1076 HANDWHEEL ACTUATOR (SIZES 1 AND 2)
B1209-2 / IL
SWITCH MOUNTED ON
TYPE 1076 HANDWHEEL ACTUATOR (SIZE 3)
Figure 5. Dimensions When Used With Actuators Mounted on Rotary-Shaft Valves (see table 5)
6
mm
(INCH)
Product Bulletin
62.3:304
November 2007
304 and 304L Position Switches
Table 5. Dimension A for Rotary Valves (see figure 5)
DIMENSION A, mm
ACTUATOR
Types 1051, 1052
SWITCH
TYPE
DIMENSION A, INCHES
Actuator Size
Actuator Size
20
33, 40, 60, 70
20
33, 40, 60, 70
304
273
265
10.75
10.44
304L
340
332
13.38
Actuator Size
Type 1061
304
304L
Type 1066 & 1066SR
All
10.44
332
13.06
Actuator Size
304
All
All
260
10.25
327
12.88
Actuator Size
Actuator Size
304
304L
Type 1076
All
265
Actuator Size
304L
Type 1069
All
All
260
10.25
327
12.88
Actuator Size
Actuator Size
1
2
3
1
2
3
304
276
279
184
10.88
11.00
7.25
304L
343
346
251
13.50
13.62
9.88
Actuator Size
Type 1077
13.06
Actuator Size
Actuator Size
0-KE, 2-KE
6-KE
7-KE, 9-KE
0-KE, 2-KE
5-KE
7-KE, 9-KE
304
327
265
272
12.88
10.44
10.69
304L
394
332
338
15.50
13.06
13.31
7
Product Bulletin
304 and 304L Position Switches
62.3:304
November 2007
Fisher is a mark owned by Fisher Controls International LLC, a member of the Emerson Process Management business division of Emerson
Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.
All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are
not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability.
We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and
maintenance of any product. Responsibility for the selection, use and maintenance of any product remains with the purchaser and end-user.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
www.Fisher.com
8
EFisher
Controls International LLC 1984, 2007; All Rights Reserved
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