Process Sealed Keylocks
Series SK
Distinctive Characteristics
Sealed body construction plus disposable boot protect contacts
and allow automated processing.
Molded-in terminals seal out flux, solvents, and
other contaminants.
Short body size for space-saving, behind panel
dimensions.
Detent mechanism, with its spring-operated
steel ball, gives crisp, positive action for
accurate switch setting.
Bifurcated, self-wiping contact mechanism
provides unequalled logic-level reliability
and smoother, positive detent actuation.
Crimped bracket legs ensure secure PCB
mounting and prevent dislodging during
automated wave soldering.
.100” x .100” (2.54mm x 2.54mm) terminal
spacing conforms to standard PC board grid
spacing.
Actual Size
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
Process Sealed Keylocks
Series SK
General Specifications
Electrical Capacity (Resistive Load)
Logic Level:
0.4VA maximum @ 28V AC/DC maximum
(Applicable Range 0.1mA ~ 0.1A @ 20mV ~ 28V)
See Supplement section to find explanation of operating range
Other Ratings
Contact Resistance:
Insulation Resistance:
Dielectric Strength:
Mechanical Life:
Electrical Life:
Nominal Operating Torque:
Contact Timing:
Angle of Throw:
80 milliohms maximum
100 megohms minimum @ 500V DC
500V AC minimum for 1 minute minimum
30,000 cycles minimum
10,000 cycles minimum
.026Nm (.234 lb
•
in) for momentary action models
.020Nm (.182 lb
•
in) for maintained action models
Break-before-make
90° for 2-position & 45° for 3-position
Materials & Finishes
Boot:
Key:
Tumbler Barrel:
Bushing:
Bracket:
Base:
Movable Contactor:
Stationary Contacts:
Terminals:
Polyvinyl chloride
Brass alloy with bright nickel plating;
brass alloy with bright nickel plating & ABS resin handle
Polyacetal
Zinc alloy with nickel plating
Steel with tin plating
Glass fiber reinforced polyamide
Beryllium copper with gold plating
Copper with gold plating
Brass with tin plating
Environmental Data
Operating Temperature Range:
Humidity:
Vibration:
Shock:
–25°C through +70°C (–13°F through +158°F)
90 ~ 95% humidity for 240 hours @ 40°C (104°F)
10 ~ 55Hz with peak-to-peak amplitude of 1.5mm traversing the frequency range & returning
in 1 minute; 3 right angled directions for 2 hours
50G (490m/s
2
) acceleration (tested in 6 right angled directions, with 5 shocks in each direction)
PCB Processing
Soldering:
Cleaning:
Wave Soldering recommended: See Profile B in Supplement section.
Manual Soldering: See Profile B in Supplement section.
Automated cleaning. Boot must be on switch during processing.
See Cleaning specifications in Supplement section.
Standards & Certifications
UL Recognition
CSA Certification:
These SK Series devices have not been tested for UL recognition or CSA certification.
These switches are designed for use in a low-voltage, low-current, logic-level circuit.
When used as intended in a logic-level circuit, the results do not produce hazardous energy.
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
Process Sealed Keylocks
TYPICAL SWITCH ORDERING EXAMPLE
Series SK
SK
POLES
1
2
SPDT
SP3T
DPDT
DP3T
2
4E
G
CONTACT MATERIAL
G
Gold Rated 0.4VA
@ 28V AC/DC
30
CIRCUITS & KEY-REMOVABLE POSITIONS
Code
2A
2B
5B
*4D
*4E
Pos. 1
ON
ON
ON
ON
ON
Pos. 2
NONE
NONE
NONE
ON
ON
Pos. 3
ON
ON
(ON)
ON
ON
Key Removes
Positions 1 and 3
Position 1
Position 1
Positions 1, 2, 3
Position 2
13
30
PC TERMINALS
Straight with Bracket
Right Angle
( ) = Momentary
*Can be used as ON-OFF-ON circuit
DESCRIPTION FOR TYPICAL ORDERING EXAMPLE
SK24EG30
Gold Contacts Rated 0.4VA
DP3T ON-ON-ON Circuit
Key Removable in Position 2
Supplied with
Polyvinyl Chloride Boot
Right Angle PC Terminals
2 keys supplied
with each switch
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
Process Sealed Keylocks
POLES, CIRCUITS & KEY-REMOVABLE POSITIONS
Pole &
Throw
SPDT
SPDT
SPDT
DPDT
DPDT
DPDT
SP3T
SP3T
DP3T
DP3T
Key Positions
Model
SK12A
SK12B
SK15B
SK22A
SK22B
SK25B
SK14D
SK14E
SK24D
SK24E
Pos 1
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
Pos 2
NONE
NONE
NONE
NONE
NONE
NONE
ON
ON
ON
ON
Pos 3
ON
ON
(ON)
ON
ON
(ON)
ON
ON
ON
ON
Connected Terminals
(Terminal numbers are not on switch)
Series SK
•
= Key Removable
= Not Removable
= Maximum Arc
POS 1
Pos 1
C1-1
C1-1
C1-1
C2-4
C1-1
C2-4
C1-1
C1-1
C1-1
C2-4
C1-1
C2-4
Pos 2
____
____
____
Pos 3
C1-2
C1-2
C1-2
C2-5
C1-2
C2-5
C1-3
C1-3
C1-3
C2-6
C1-3
C2-6
1
1
Schematic
C1
3
POS 1
1
2
POS 1
C1
C2
3
POS 1
2
4 5
3
C1
POS 1
2
3
3
____
C1-2
C1-2
C1-2
C2-5
C1-2
C2-5
2
1
2 3
POS 1
3
C1
C2
POS 1
2
3
2
2 3
4 5 6
POS 1
3
KEY REMOVABLE
A
Positions 1 & 3
90° Angular Throw
B
Position 1
90° Angular Throw
D
Positions 1, 2 & 3
45° Angular Throw
E
Position 2
45° Angular Throw
CONTACT MATERIAL & RATING
G
Gold over Copper
Logic Level
0.4VA maximum @ 28V AC/DC maximum
TERMINALS
13
Straight PC Terminals with Bracket
Double Throw Model
Three Throw Model
30
Right Angle PC Terminals
Double Throw Model
Three Throw Model
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
Process Sealed Keylocks
KEYS
AT4080 Standard
Antistatic Plastic Handle
Brass Alloy with
Bright Nickel Plating
& ABS Resin Handle
2 keys supplied
with each switch
(5.0)
.197
(20.0)
.787
Series SK
(1.5)
.059
(14.5)
.571
(10.1)
.398
PCB
Suitable for all Straight PCB mount and for Right Angle
PCB mount where clearance for key is obtainable.
AT4079 for Right Angle Mid-board Mounting (Optional)
All Metal
Brass Alloy with
Bright Nickel Plating
Contact factory if
metal keys needed
(16.0)
.630
(14.0)
.551
(1.5)
.059
(8.8)
.346
(2.0)
.079
PCB
TYPICAL SWITCH DIMENSIONS
Straight PC with Bracket • Double Throw
Single & Double Pole
POS 1
90ϒ
(12.0) Dia
.472
(1.0)
.039
POS 3
(20.0)
.787
(0.5) Typ
.020
(2.54)
.100
1
2
(0.7) Dia Typ
.028
4
5
(5.08) Typ
.200
(2.54) Typ
.100
(10.5)
.413
(3.5)
.138
(15.74)
.620
C1
C2
(3.0)
.118
(14.5)
.571
(14.8)
.583
(0.3)
.012
(10.5)
.413
(0.7) Typ
.028
(10.16)
.400
SK12AG13
Single Pole models have only terminals 1, 2 & C1
Straight PC with Bracket • Three Throw
Single & Double Pole
POS 2
45ϒ
POS 1
(12.0) Dia
.472
45ϒ
POS 3
(1.0)
.039
(20.0)
.787
(0.5) Typ
.020
(2.54)
.100
1
2
(0.7) Dia Typ
.028
4
5
6
C2
(5.08) Typ
.200
(2.54) Typ
.100
(10.5)
.413
(3.5)
.138
3
C1
(15.74)
.620
(14.5)
.571
(3.0)
.118
(14.8)
.583
(0.3)
.012
(10.5)
.413
(0.7) Typ
.028
(10.16)
.400
SK24DG13
Single Pole models have only terminals 1, 2, 3 & C1
05-08
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
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