Gemco 2000 Series Catalog Page
Application
Gemco’s Rotary Limit Switches are primarily used for machine tools,
handling devices, and rotary operators where motion is expressed in
shaft rotation. The primary purpose of the switch is to control the
intermediate or end limits of a linear or rotary motion. The switch is
often used as a safety device to protect against accidental damage to
equipment.
Description
Quality parts make each Rotary Limit Switch highly dependable.
• The 1/2” input shaft (includes Woodruff Key) drives a bronze gear
which rotates the cam block. The cam block houses independently
adjustable cams that actuate the precision type snap action
switches.
• Each switch can be provided with one to four single pole, double
throw switches or a maximum of two double pole, double throw
switches for versatility of control circuits.
• No minimum speed is specified because snap action contacts are
used. Maximum rated speed of the worm shaft is 1000 RPM and
can be rotated clockwise or counterclockwise.
• Gemco’s Rotary Limit Switch offers the broadest range of standard
gear selections of any switch available. Standard ratios range from
5:1 through 5333.3:1.
• Max. Operating Temperature 180°F
Enclosures
NEMA Type 1 and 12 (General Purpose) enclosures are molded from
FIBRALLOY® a special fiber glass material that is resistant to acids,
alcohols, hydro carbons and heat. A tight fitting synthetic gasket
prevents the entrance of oil and coolants. External mounting holes
enable switch mounting without internal interference. (See Figures 1
and 2.)
NEMA Type 4 (Watertight) enclosures are made of cast aluminum;
cast iron or cast bronze enclosures can be provided upon request.
NEMA Type 7 & 9 (Hazardous Location) enclosures are designed to
meet the requirements of the National Electrical Code for Class 1,
Group D, and Class 2.
Groups E, F & G. The enclosures are made of
cast aluminum; cast iron or bronze enclosures
can be provided upon request. (See Figure 3.)
Rotary Limit Switches
often pays for itself by eliminating cost of stampings
When the cam rotates, the switches "E" and "F" are actuated and the contacts
check these advantages.... worm gear type
The GEMCO Rotary Limit Switch
• reduces hazards to inexperienced users.
• removes danger of terminal shorting from water,
corrosion, or accidental shorting from other metal
objects because of its insulating properties.
• enclosures are made of FIBRALLOY® -- an electrical
insulator.
The GEMCO Rotary Limit Switch.
• reduces design time.
• reduces machine work on special cams and gears
for different operating ratios.
• cams are all standard regardless of ratios.
• offers special cams upon request.
The GEMCO Rotary Limit Switch.
•
and machined bushings in linkages.
• reduces assembly time.
Mounting
The switch may be mounted in any convenient position. An "L" shaped mounting bracket which permits innumerable
mounting positions for all enclosures, can be supplied upon request.
Adjustment
• Front cam "A"actuates switch "F";
rear cam "0" actuates switch "E".
• Both switches "E" and "F" have
independent adjustable cams.
• To adjust cam "A" loosen Allen
Screw "B".
• To adjust cam "0" loosen Allen
Screw "C".
change from the normally closed to open position and normally open to the
closed position.
worm gear type
.....plus a broad range of application
mechanical presses
Both die and press, worth thousands
the cost of the Gemco Rotary Limit
Switch, are safely protected when the
connecting rod length is adjusted.
loaders
You can control travel of
pushers, grabs, and other
reciprocating parts
handlers directly from
drive shafts.
One or more open and close
limits on pipe line, pumping
station and machinery valves
are accurately controlled with
Gemco Rotary Limit
Switches.
door operators
The Gemco Rotary Limit Switch is mounted on
the drive unit, with gear take-off from the main
drive shaft. Much wiring is eliminated. Cam
accuracy maintains door closing to practical limits.
valves
handling fixtures
Assures accurate movement
and placement of parts, plus
control of mechanical
clamping in welding,
induction heating or
machining fixtures.
hoists
Gemco switches on this line of hoists
protect power unit from damage by
controlling critical upper and lower limit.
windows
Gemco Rotary Limit Switches
are used for window
operators in skylights and
monitors, for central station
control.
motor operated valves
packaging machinery
tapping heads
elevating mechanisms
pipe threading machines
index tables
transformer tap changers
conveyors
Max Speed — 1000 RPM worm gear type
Input
Shaft
Rev.
Cam
Block
Rev.
5
10
20
30
40
50
60
80
100
150
250
300
500
600
1000
2000
4000
53333
Input
Shaft
Rev.
Cam
Block
Rev.
5
10
20
30
40
50
60
80
100
150
250
300
500
600
1000
2000
4000
5333.3
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
1 2000-1B
2000-38B
2000-2B
1 2000-3B
2000-4B
2000-5B
1 2000-6B
2000-7B
2000-8B
1 2000-129B
2000-28B
2000-130B
1 2000-29B
2000-131B
2000-30B
1 2000-292B
2000-279B
2000-281B
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
1 2000-137B
2000-138B
2000-25B
1 2000-47B
2000-139B
2000-73B
1 2000-75B
2000-77B
2000-43B
1 2000-1130B
2000-140B
2000-1133B
1 2000-141B
2000-1136B
2000-142B
1 2000-1139B
2000-1142B
2000-1145B
NEMA 4 Encl.
(1)
2000-98
2000-39B
2000-10B
2000-11B
2000-12B
2000-13B
2000-14B
2000-15B
2000-16B
2000-132B
2000-31B
2000-133B
2000-32B
2000-134B
2000-33B
2000-299B
2000-127B
2000-157B
NEMA 4 Encl.
(1)
2000-145B
2000-146B
2000-147B
2000-148B
2000-149B
2000-1508
2000-151B
2000-152B
2000-153B
2000-1131B
2000-154B
2000-1134B
2000-155B
2000-1137B
2000-156B
2000-1140B
2000-1143B
2000-1146B
NEMA 7 Encl.
(1)
2000-17B
2000-40B
2000-18B
2000-198
2000-20B
2000-21B
2000-22B
2000-23B
2000-24B
2000-135B
2000-34B
2000-136B
2000-35B
2000-43B
2000-36B
2000-291B
2000-128B
2000-158B
NEMA 7 Encl.
(1)
2000-159B
2000-160B
2000-161B
2000-60B
2000-1628
2000-163B
2000-164B
2000-165B
2000-166B
2000-1132B
2000-167B
2000-1135B
2000-168B
2000-1138B
2000-169B
2000-1141B
2000-1144B
2000-1147B
Input Shaft
Turns****
Setting
4 1/2
9 1/4
18
28
37
46
58
77
94
135
230
265
460
555
920
Consult
Factory
Input Shaft
Turns****
Setting
4 3/4
9 1/4
19
28 1/2
37 3/4
46 3/4
58
75
95
135
237
265
460
555
920
Consult
Factory
To
Reset
1/16
18
1/8
1/4
1/4
1/4
1 1/2
3/4
3/4
4
6
6 1/2
15 1/4
16
29
To
Reset
1/8
1/4
1/2
1/2
3/4
3/4
1 1/2
1 3/4
2
4
6
61 1/2
15 1/4
16
29
Input
Shaft
Rev.
Cam
Block
Rev.
5
10
20
30
40
60
80
100
150
250
300
500
600
1000
2000
4000
5333.3
Input
Shaft
Rev.
Cam
Block
Rev.
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
1 2000-174B
2000-175B
2000-176B
1 2000 177B
2000 178B
2000 179B
1 2000-180B
2000-181B
2000-182B
1 2000-170B
2000-183B
2000-187B
1 2000 184B
2000-1100B
2000-185B
1 2000-1103B
2000-1106B
2000-1109B
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
*Switch capacities: 125V. - 15 amps. AC., 1/2 amp. D.C.
15 amps. AC.. 1/4 amp. D.C.
460V. 15 amps. AC.
**Switch capacities: 125 or 250V. AC. - 10 amps.
125V. D.C. - 1/2 amp.
250V. D.C. - 1/4 amp.
(1) — For Cast Iron or Bronze Enclosure Contact Factory.
5
10
20
30
40
50
60
80
100
150
250
300
500
600
1000
2000
4000
5333.3
1 2000-89B
2000-90B
2000-91B
1 2000-92B
2000-93B
2000 94B
1 2000-95B
2000-96B
2000-97B
1 2000-1112B
2000-98B
2000-1115B
1 2000-99B
2000-1118B
2000-100B
1 2000-1121B
2000-1124B
2000-1127B
NEMA 4 Encl.
(1)
NEMA 7 Encl.
(1)
Input Shaft
Turns****
To
2000-188B
2000-189B
2000-190B
2000-191B
2000 192B
2000 193B
2000-194B
2000-195B
2000-196B
2000-171B
2000-197B
2000-300B
2000 198B
2000-1101B
2000-199B
2000-104B
2000-1107B
2000-11108
NEMA 4 Encl.
(1)
2000-263B
2000-264B
2000-265B
2000-266B
2000 267B
2000 268B
2000-269B
2000-270B
2000-271B
2000-186B
2000-272B
2000-301B
2000 273B
2000-1102B
2000-274B
2000-1105B
2000-1108B
2000-1111B
NEMA 7 Encl.
(1)
Setting
4 3/4
9 1/2
19 1/4
28 1/2
38
47
57 12
76 3/4
96 1/4
135
234
265
460
555
920
Input Shaft
Reset
1/16
116
1/8
1/4
1/2
1/2
12
12
1 12
4
2
6 1/2
7
16
10
Consult
Factory
Turns****
To
Setting
2000-101B
2000-102B
2000-103B
2000-104B
2000-105B
2000 106B
2000-107B
2000-1 088
2000-109B
2000-1113B
2000-110B
2000-1116B
2000-111B
2000-1119B
2000-112B
2000-1122B
2000-1125B
2000-1128B
***Switch capacities: 250V.
Mechanical rating - 20 million cycles
Electrical rating - 125V. AC. - 10 amps. resistive load.
250V. AC. - 10 amps. resistive load
30V. D.C. - 7 amps. inductive load
****Figures are based on a switch using a standard 25' cam:
maximum setting between limits.
2000-113B
2000-114B
2000-115B
2000-1 1 6B
2000-117B
2000-118B
2000-119B
2000-1 20B
2000-121B
2000-1114B
2000-122B
2000-1117B
2000-123B
2000-1120B
2000-124B
2000-1123B
2000-1 126B
2000-1129B
434
9 12
19 14
28 1/2
36
47
57 1/2
76 3/4
96 1/4
135
234
265
460
555
920
Reset
1/16
1/16
18
1
12
1 2
1/2
1/2
1 1/2
4
2
61/2
7
16
10
Consult
Factory
worm gear type
not listed, can be furnished on special order. When ordering, please
recommend the most suitable Gemco Rotary Limit Switch for your needs. Custom designed switches are
Special Cams*
Cam**
Part No.
S-55-A Standard 25° or 335°
S-68-A Special 540° or 306°
S-84-A Special 75° or 285°
S-69-A Special 90° or 270°
S-85-A Special 105° or 255°
S-86-A Special 135° or 225°
S-87-A Special 150° or 210°
S-70-A Special 180°
S-71-A Special 240° or 120°
S-127-A Special 360° Blank Cam
*Special cams
Ordering
When ordering desired switch, specify:
1. Catalog Number
3. Desired Gear Ratio
2. Number of Cams
4. Type of Enclosure
Example: If a four circuit standard enclosure, 5:1, is required with four 900 cams, order Catalog No.
2000-89 with four Part No. S-69-A Cams. See Special Cam Chart above.
specify cam angle.
Period for which switch contacts
are opened or closed
In selecting a gear ratio, maximum accuracy and ease of adjustment are more easily obtained if full
travel of drive equals, or is less than maximum setting between limits.
Example: If 90 revolutions of a window drive opens a window, a gear ratio of 100:1 should be selected.
Design Service
Gemco Design Engineers will be pleased to assist in the solution of any special control problems and to
available to specifications.
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