Ohmite
Power Tap Switches and Knobs
Visit OhmiteÕs Website at www.ohmite.com
Switches
c
c
c
Slow-Break, Quick-Make
Non-Shorting Type
Single and Tandem Models
Ohmite power tap switches (high power rotary switches) are constructed to provide dependable, convenient
operation. All switches have ceramic arc-proof bodies (except 711), metal alloy contacts, and are of an
all-soldered and all-riveted construction which assures mechanical and operational integrity. The 711 Tap Switch
has a reinforced non-metal body and solid metal alloy contacts; a very small unit with high current handling
capability. These Tap Switches have a wide range of applications such as as arcwelders, battery chargers, motor
controls, X-ray equipment, etc. Additional number of taps, configurations, assemblies, and arrangements are
available as special order items. Call for pricing and delivery info.
Model 711 Miniature Switch
Single pole, non-shorting selector switch with stationary and movable solid silver alloy contacts. Common
contact is rounded for assured seating. Self-cleaning with built in wiping action. Slow-break, quick-make action
achieved with cam and cam follower. Breaks 7 amps at 125 VAC (for 20 VDC); carries 15 amps at 125 VAC/DC.
5
Molded melamine phenolic body 11/
8
" dia. ´
/16" depth behind panel; / " flatted shaft. Mounts by
13
1
4
3
/8-32 bushings and hex nut. Model number suffix indicates taps (711-3 = 3 taps). Use 5103 knob.
Ceramic High-Current Rotary Switches
Light Current Rotary Switches
Models 111, 212, 312, 412, 608.
Models T505 and T507.
Non-shorting, single pole, rotary, multi-position unit with single, dual and triple tandem units. Bodies are high
grade, arc proof ceramic bodies. Large, solid, silver alloy contacts. Positive cam and roller mechanism provides
slow-break, quick-make action. Shaft is insulated by strong ceramic hubs. Enclosed mechanism. Contacts and
mechanism are entirely enclosed and protected.
Rated at 7 amps max, but only 3 amps at 120 VAC should be interrupted. Current ratings are less for inductive
circuits, high voltages and all direct current circuits above 20 volts. Porcelain base and porcelain ring carrying
the fixed contacts are vitreous coated. Metal tap contacts. Brush is silver graphite for very low resistance. Body
dia. is 25/16". Behind panel depth is 13/8". Weight: .28 lb. Knob 5150 is recommended.
Depth Behind Panel
(Tandem)
Single Unit
Wt. (Lbs.)
Mfr.Õs
Type
Dia.
(In)
Shaft
Dia.
AC Rating
Single
Double
Triple
1
111
212
312
412
608
15 A 125 V
20 A 150 V
30 A 300 V*
50 A 300 V*
100 A 300 V
13/
21/
4
/
4
4
4
4
8
11/
13/
21/
8
4
4
23/
4
Ñ
Ñ
Ñ
.16
.40
.75
1.40
5.00
1
4
/
Ñ
Ñ
Ñ
613
1
315
/16
/
43/16
6
/
27/16
35/16
75/
8
1
3
/
/
16
105/16
* 150 V between taps
Model 111
Model 412
EACH
10-24
EACH
Stock
No.
Mfr.Õs
Type
Number
of Taps
Tandem
Sections
Rotation
Degrees
Stock
No.
Mfr.Õs
Type
Number
of Taps
Tandem
Sections
Rotation
Degrees
1-9
25-49
1-9
10-24
25-49
291-0820
291-0825
291-0830
291-0835
291-0840
291-0845
291-0850
291-0855
291-0860
291-0865
111-3
111-4
111-5
111-6
111-7
3
4
5
6
7
1
1
1
1
1
1
1
1
2
2
60
90
24.14
24.38
20.40
28.09
24.15
31.56
34.63
30.19
54.98
57.62
23.36
23.59
18.83
25.94
22.29
29.13
31.98
29.22
50.75
53.18
22.63
22.85
17.49
24.08
20.69
28.35
29.68
28.31
47.13
49.39
291-0920
291-0925
291-0930
291-0935
291-0940
291-0950
291-0955
291-0960
412-3
412-5
412-6
412-7
3
5
6
7
8
10
12
6
1
1
1
1
1
1
1
3
60
61.52
68.90
73.45
76.18
80.82
88.17
86.78
234.04
56.78
63.60
67.80
73.72
78.21
81.38
82.99
226.49
52.73
59.06
62.96
71.42
75.77
75.57
80.47
219.41
120
150
180
210
270
330
150
120
150
180
210
270
300
60
412-8
111-8
8
412-10
412-12
412-6-T3
111-10
111-11
111-3-T2
111-4-T2
10
11
3
4
90
Model 608
291-0970
291-0975
608-6
608-8
6
8
1
1
150
210
220.63
241.93
203.66
234.12
189.11
226.81
Model 212
291-0870
291-0875
212-6
212-12
6
12
1
1
150
330
50.48
54.33
46.60
50.15
43.27
46.57
Model 711
291-0985
291-0990
291-0995
291-1000
711-3
711-4
711-5
711-6
3
4
5
6
1
1
1
1
60
90
120
27.88
32.32
32.57
41.67
25.74
31.27
30.06
38.47
23.90
30.30
27.91
35.71
Model 312
150
291-0880
291-0885
291-0895
291-0905
291-0910
291-0915
312-3
312-6
312-8
312-10
312-11
312-12
3
6
8
10
11
12
1
1
1
1
1
1
60
150
210
270
300
330
66.67
74.12
68.35
73.22
77.03
83.33
61.55
68.43
63.09
70.86
72.65
76.92
57.13
63.53
58.58
68.64
70.38
71.44
Open Type
291-4545
291-4550
T505
T507
5
7
1
1
120
180
49.25
48.68
44.24
43.72
42.10
41.61
Knobs
EACH
EACH
Stock
No.
Mfr.Õs
Type
Knob Hole
Set
Stock
No.
Mfr.Õs
Type
Knob Hole
Set
Description
Description
Dia.
Dia. Screw
Dia.
Dia. Screw
1-9
10-24
25-49
50-99
1-9
10-24
25-49
50-99
1
1
296-1215 5103
296-1217 5104
296-1218 5104A Handwheel with pointer
296-1220 5105
296-1225 5109
Bar knob 11/
Handwheel with pointer
4
" long
Ñ
4
/
4
"
Slot
Slot
Hex
Slot
Slot
3.32
15.23
15.99
13.69
16.66
3.21
14.51
15.22
13.24
15.87
3.11
14.06
14.76
12.83
15.38
3.01
13.06
13.70
12.44
14.28
296-1227 5111
296-1230 5111A Finger-grip with pointer
296-1232 5116
296-1235 5150
296-1240 5151
Finger-grip with pointer
23/
23/
8
"
/
4
"
Slo
Hex
Slo
Slo
Slo
t15.63
17.68
t 6.04
t 4.70
t 3.49
14.89
17.11
5.84
4.49
3.37
14.43
16.57
5.66
4.36
3.27
13.40
16.07
5.49
4.23
3.17
3
1
/4"
1
31/
31/
"
"
"
"
/
8"
8"
3
4
/
8
"
8"
Bar knob 11/
Finger-grip
Finger-grip
2" long
Ñ
/4"
1
3
Handwheel without pointer 31/
Finger-grip with pointer
4
/
11/
2"
4"
/ "
1
8
4
1
3
15/
8
/
4"
/
/
"
246
b
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