Snap-acting
Product Selection Guide
Snap-acting
Series
Switch Type
Poles/Throws
Maximum Current
Terminations
Solder
Turret
Quick Connect
Screw
Wire Leads
•
•
•
•
•
•
•
•
•
•
•
•
•
J–6
J-12 / J-16
J-20
J-26
J–32
J–36
•
•
•
•
•
•
J–40
•
J–44
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
TF
Miniature
SPST, SPDT
21 Amps
TFS
Sealed
Miniature
SPDT
10 Amps
TF2
Sealed
Miniature
SPDT
10 Amps
TM
Miniature
LC
LCA
LCS
LCW
Sealed
Subminiature
SPST
0.1 Amps
Sealed
Subminiature Subminiature
Subminiature
Precision
SPDT
SPST
SPST, SPDT SPST, SPDT
15 Amps
10.1 Amps
10 Amps
6 Amps
J
Snap-acting
PC
Formed PC
Extended
Operations
Sealed
Page No.
Snap-acting
Series
Switch Type
Poles/Throws
Maximum Current
Terminations
Solder
Quick Connect
Wire Leads
Screw
PCB Thru-hole
Flat & Step Base
Bushing
Sealed
Page No.
J–48
J–51
J–51
J–54
J–58
•
J–61
•
J-65
J–69
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
MM
MS
ZM
ZMA
ZMB
ZMS
ZMSM
Sealed
Subminiature
SPDT
3 Amps
MDS
Subminiature
SPDT
300 m Amps
Sealed
Subminiature Subminiature Subminiature Subminiature
Subminiature Subminiature
Precision
SPDT
7 Amps
SPDT
3 Amps
SPDT
3 Amps
SPDT
3 Amps
SPDT
0.1 Amps
SPDT
3 Amps
Dimensions are shown: Inch (mm)
Specifications and dimensions subject to change
J–2
www.ckswitches.com
Snap-acting
Product Selection Guide
Snap-acting
Series
Switch Type
Poles/Throws
Maximum Current
Terminations
Solder
Quick Connect
Wire Leads
Screw
PCB Thru-hole
Flat & Step Base
Bushing
Page No.
•
15/32-32
J–81
3/8-23
J–81
J-86
J-89
•
•
•
•
•
•
•
HB
Standard
Precision
SPST,
SPDT
20 Amps
A
General
Purpose
SPST,
SPDT, DP
30.1 Amps
TL
Door
Interlock
SPDT
15 Amps
DS
Door
Interlock
SPDT
DPDT
0.1, 10, 16A
J
Snap-acting
Dimensions are shown: Inches (mm)
Specifications and dimensions subject to change
J–3
www.ckswitches.com
Snap-acting
Technical Data
HOW TO CHOOSE PRECISION SNAP-ACTING SWITCHES AND ACTUATORS
This catalog describes electric switches that satisfy the following definition: “A precision snap-acting switch is a mechanically
operated electric switch having predetermined and accurately controlled characteristics and having contacts other than blade-
and-jaw, or mercury-type, where the maximum separation between any butting contacts is 1/8 inch.”
In choosing a switch, the first thing to consider is its electrical rating. As a basic part of an electric control system, the switch
must be able to carry the full load current in the system, to interrupt this current, and to handle any surge of current that may
occur when the switch contacts close or any transients that occur when contacts open.
The method of applying mechanical force to operate the switch influences the choice of actuator. Basic switches are provided
with leaf spring, levers, or other linkages between the switch plunger and the actuating device, which are typically used to pro-
vide additional overtravel and reduce the operating force. The differential travel measured at the free end of the leaf or lever is
considerably greater than that measured at the switch plunger and max. operating force is adequately smaller. Table 1 relates
types of actuators to means of applying operating force.
ACTUATOR
Overtravel
Plunger
D, Q, J
Roller
Plunger
R
Roller
Leaf
W
Hinged
Lever
T
Hinged
Roller Lever
A
Reverse-Acting
Hinged Lever
Y
Reverse-Acting
Hinged
Roller Lever
F
1
MOTION OF APPLIED
OPERATING FORCES
CAM
Rotary
LEVER
Angular
Pin
Basic
Leaf
L
√
√
√
2
√
√
√
√
√
√
√
√
√
√
√
√
1
√
2
√
√
√
J
Snap-acting
SLIDE
Wedge
PLUNGER
In-Line
BI-METAL
or BELLOWS
Slow In-Line
√
√
3
√
√
√
√
√
√
√
Suitable for this actuating method.
1
Where large overtravel is required.
2
Do not use when there is side thrust.
3
Use only where the actuating device contains provisions for absorbing excess over travel.
ELECTRICAL LIFE CHARACTERISTICS FOR SNAP-ACTING SWITCHES
The primary limitation to electrical life of a switch is wear of the contacts. In general, contacts wear out more quickly as current
or voltage is increased and as power-factor is decreased. This is indicated by the graph below, which shows electrical life of
switches tested under ordinary atmospheric conditions, operated 60 times a minute, with AC power handled on both the
normally open and the normally closed contacts. The high inrush current encountered in lamp loads and in motor or other
inductive loads is responsible for decreased contact life under such loading.
20
15
250 V AC, RESISTIVE
250 V AC, 0.5 P.F.
125 V AC, RESISTIVE
125 V AC, 0.5 P.F.
TYPICAL ELECTRICAL LIFE OF TYPE HB SWITCH
10
Amperes
5
.1
.2
.3
.4
.5
.7
1
Millions of Operations
2
3
4
5
7
Dimensions are shown: Inch (mm)
Specifications and dimensions subject to change
J–4
www.ckswitches.com
Snap-acting
Technical Data
MECHANICAL LIFE CHARACTERISTICS FOR SNAP-ACTING SWITCHES
Fatigue of the internal spring blade is the limiting factor in the mechanical life of a switch. This fatigue can often be reduced
and the life thereby extended, by reducing overtravel. One method is to use a leaf or lever actuator or a plunger containing an
overtravel-absorbing spring. Tests on switches of the types covered in this catalog indicate that the mechanical life of a lever
actuated switch is more than double that of a switch having the operating force applied directly on the pin.
Mechanical life is also affected by the combination of total travel and operating force. Thus a high-sensitivity switch which has
small travel and light force, has about twice the life expectancy of a high current type switch, in which the travel/ force
combination is relatively high. Experience indicates that million of operations is a reasonable mechanical life expectancy for a
basic snap switch.
For the best mechanical life, the applied overtravel force should not exceed three times the operating force.
AC RATINGS FOR SNAP-ACTING SWITCHES
Switches used to control alternating current loads, up to the ratings shown in this catalog, will maintain repeatability of charac-
teristics and provide long electrical life (refer to graph on page K-3). In special circumstances, higher currents or voltages
may be controlled, but changes in performance must be anticipated.
Switches used to control “dry circuits” can be furnished, but factory recommendations should be secured.
DC RATINGS FOR SNAP-ACTING SWITCHES
To use the table below, determine the contact separation of the switch and select the ratings from the appropriate line.
The maximum current rating must be limited to the current value listed for that switch type in the body of the catalog.
J
ACTUATOR
Heater Load
Lamp Load (tungsten)
INDUCTIVE
Snap-acting
Motor, Relay, or Solenoid Load
Sea Level
50,000 Feet
Normally
Open
Contact
Amperes
7.0
5.0
1.0
0.02
0.01
15.0
8.0
2.0
0.03
0.02
150
15.0
5.0
0.05
0.03
15.0
15.0
7.5
0.2
0.1
Normally
Closed
Contact
Amperes
7.0
5.0
1.0
0.02
0.01
15.0
8.0
2.0
0.03
0.02
150
15.0
5.0
0.05
0.03
15.0
15.0
7.5
0.2
0.1
CONTACT
SEPARATION
Inches
DIRECT
CURRENT
VOLTAGE
Volts
6-8
12-14
24-30
110-115
220-230
6-8
12-14
24-30
110-115
220-230
6-8
12-14
24-30
110-115
220-230
6-8
12-14
24-30
110-115
220-230
Normally
Open
Contact
Amperes
15.0
15.0
2.0
0.4
0.2
15.0
15.0
6.0
0.4
0.2
15.0
15.0
10.0
0.6
0.3
15.0
15.0
15.0
0.75
0.3
Normally
Closed
Contact
Amperes
20.0
20.0
2.0
0.4
0.2
20.0
20.0
6.0
0.4
0.2
20.0
20.0
10.0
0.6
0.3
20.0
20.0
20.0
0.75
0.3
Normally
Open
Contact
Amperes
1.5
1.5
1.5
0.4
0.2
1.5
1.5
1.5
0.4
0.2
1.5
1.5
1.5
0.6
0.3
1.5
1.5
1.5
0.75
0.3
Normally
Closed
Contact
Amperes
3.0
3.0
2.0
0.4
0.2
3.0
3.0
2.0
0.4
0.2
3.0
3.0
2.0
0.6
0.3
3.0
3.0
2.0
0.75
0.3
Normally
Open
Contact
Amperes
8.0
5.0
1.0
0.03
0.02
15.0
10.0
5.0
0.05
0.03
15.0
15.0
10.0
0.1
0.05
15.0
15.0
10.0
0.4
0.2
Normally
Closed
Contact
Amperes
8.0
5.0
1.0
0.03
0.02
20.0
10.0
5.0
0.05
0.03
20.0
20.0
10.0
0.1
0.05
20.0
20.0
10.0
0.4
0.2
.010
.020
.040
.070
Dimensions are shown: Inches (mm)
Specifications and dimensions subject to change
J–5
www.ckswitches.com
stm32/stm8
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