Snap Switch Pushbuttons
GENERAL SPECIFICATIONS
Electrical Capacity
Other Ratings
Resistive Load:
Lamp Load:
15A &
1
⁄
2
HP @ 125 or 250V AC for high capacity models
5A @ 125V AC
Series SCB
Contact Resistance:
Insulation Resistance:
Dielectric Strength:
Mechanical Life:
Electrical Life:
Travel:
Operating Temp Range:
15 milliohms maximum
100 megohms minimum @ 500V DC
1,000V AC minimum between contacts for 1 minute minimum;
1,500V AC minimum between contacts & case for 1 minute minimum
1,000,000 operations minimum
50,000 operations minimum
Pretravel .047” (1.19mm); Overtravel .040” (1.01mm); Differential .011” (0.27mm)
–40°C through +85°C (–40°F through +185°F)
Polycarbonate with glossy finish or PBT
Polyacetal or brass with nickel plating
Steel with zinc plating or glass fiber reinforced polyamide
Polyester
Silver alloy
Brass with silver plating
Internal snap switch is UL recognized.
Internal snap switch is CSA certified.
Materials & Finishes
Caps & Shrouds:
Plunger:
Bushing:
Case:
Movable & Stationary Contacts:
Terminals:
UL Recognized:
CSA Certified:
Standards & Certifications
TYPICAL SWITCH ORDERING EXAMPLE
SCB
POLES
1
2
SPDT
DPDT
2
5
P
TERMINALS
15
A
1
2
3
4
5
4
CAPS & SHROUDS
For Momentary
.315” (8.0mm) Diameter Cap
.394” (10.0mm) Diameter Cap
.520” (13.2mm) Diameter Cap
Round Cap and Shroud
Rectangular Cap and Shroud
CA
A
.187” (4.75mm) Quick Connect
.250” (6.35mm) Quick Connect
CIRCUITS
5
6
ON
ON
(ON)
ON
B
Note: Contact factory for availability of
screw lug and solder lug models.
For Momentary & Alternate Action
( ) = Momentary
BUSHINGS
P
S
Plastic (with
momentary only)
Steel
DESCRIPTION FOR TYPICAL ORDERING EXAMPLE
SCB25P15A-4CA
Round Red Cap with
Black Shroud
Plastic Bushing
DPDT
ON-(ON) Circuit
15A Rating
.187” (4.75mm)
Quick Connect
Terminals
COLORS
Caps
A
B
C
F
G
H
Shrouds
Black
White
Red
Green
Blue
Gray
A
B
–
–
–
H
RATING
15
15A
Note: Standard hardware provided with caps. See Bushing detail for more information.
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
Snap Switch Pushbuttons
POLES & CIRCUITS
Plunger Position
( ) = Momentary
Normal
Keyway
Series SCB
Throw & Schematics
Connected Terminals
Normal
Keyway
Down
Down
Note:
Terminal numbers are
actually on the switch.
Pole
SP
Model
SCB15
SCB16
SCB25
SCB26
ON
ON
ON
ON
(ON)
ON
(ON)
ON
1-2
1-3
SPDT
1
2
3
DP
1-2 1-2
1-3 1-3
SP with
2 switches
1
1
2
3
2
3
BUSHINGS
P
Plastic
(for Momentary only)
(12.5) Dia
.492
(11.5)
.453
(1.5)
.060
A
S
Steel
(12.5) Dia
.492
(11.5)
.453
(1.5)
.060
(10.0)
.394
Max. Effective Panel Thickness:
.165” (4.2mm) without Shroud
.157” (4.0mm) with Shroud
“A” =
11.2mm
Momentary
15.5mm
Alternate Action
Max. Effective Panel Thickness:
Momentary: .177” (4.5mm) without Shroud
.157” (4.0mm) with Shroud
Alternate Action: .354” (9.0mm)
Standard Hardware Provided with Caps
Cap Options 1, 2, & 3: AT504M Knurled Face Nut, AT508 Lockwasher, AT527M Hex Mounting Nut
Cap Options 4 & 5: AT508 Lockwasher & AT527M Hex Mounting Nut
TERMINALS
A
.187” (4.75mm)
Quick Connect
(9.78)
.385
(3.18)
.125
(10.16)
.400
(4.75)
.187
Thk = (0.5)
.020
B
.250” (6.35mm)
Quick Connect
(8.38)
.330
(4.06)
.160
(10.54)
.415
(6.35)
.250
Thk = (0.81)
.032
TYPICAL SWITCH DIMENSION
.315” (8.0mm) Dia. Cap • .250” (6.35mm) Quick Connect
C
L
(0.81) Typ
.032
NC 2
(8.08)
.318
(1.02)
.040 (14.35)
.565
(8.38)
.330
(6.35)
.250
(4.06)
.160
(10.54)
.415
NO 3
M12 P1
(8.0) Dia
.315
Keyway
C
L
(14.0)
.551
COM
1
(22.23)
.875
(28.2)
1.110
(28.83)
1.135
SCB15P15B-1C
(6.5)
.256
(10.8)
.425
(0.6)
.024
(10.6)
.417
(10.3)
.406
(22.1)
.870
(7.85) Max
.309
(10.16)
.400
(18.0)
.709
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
Snap Switch Pushbuttons
TYPICAL SWITCH DIMENSIONS
.394” (10.0mm) Dia. Cap • .187” (4.75mm) Quick Connect
C
L
Series SCB
(4.75)
.187 (3.18)
.125
(9.78)
.385
(10.16)
.400
(0.5) Typ
.020
NC 2
(5.84)
.230
(1.02)
.040 (13.97)
.550
NO 3
M12 P1
(4.5)
.177
(10.0) Dia
.394
C
L
(8.0)
.315
(11.8)
.465
COM
1
(22.23)
.875
(28.0)
1.102
(28.83)
1.135
Keyway
SCB15S15A-2A
(11.2)
.441
(10.3)
.406
(21.6)
.850
(7.85) Max
.309
(10.16)
.400
(18.0)
.709
.520” (13.2mm) Dia. Cap • .187” (4.75mm) Quick Connect
C
L
(0.5) Typ
.020
NC 2
(5.84)
.230
(1.02)
.040 (13.97)
.550
(9.78)
.385
(4.75)
.187 (3.18)
.125
(10.16)
.400
NO 3
M12 P1
(4.5)
.177
(13.2) Dia
.520
(11.0)
.433
(14.2)
.559
COM
1
(22.23)
.875
(28.0)
1.102
(28.83)
1.135
C
L
Keyway
(11.2)
.441
SCB15S15A-3C
(10.3)
.406
(21.6)
.850
(7.85) Max
.309
(10.16)
.400
(18.0)
.709
Round Cap & Shroud • .187” (4.75mm) Quick Connect
(14.0)
.551
Shown with (4.0) Panel
.157
(0.5) Typ
.020
NC 2
(5.84)
.230
(1.02)
.040 (13.97)
.550
(4.75) Typ
.187
(3.18)
.125
(9.78)
.385
(10.16)
.400
NO 3
(17.7) Dia
.697
(24.0) Dia
.945
M12 P1 (10.3)
.406
(0.6)
.024
(22.1)
.870
COM
1
(22.23)
.875
(28.2)
1.110
(28.83)
1.135
(2.0)
.079
SCB25P15A-4CA
(12.0)
.472
(21.2)
.835
(7.85) Max
.309
(20.32)
.800
(27.0)
1.063
Rectangular Cap & Shroud • .250” (6.35mm) Quick Connect
(20.7)
.815
Shown with (4.0) Panel
.157
(0.81) Typ
.032
NC 2
(8.08)
.318
NO 3
(6.35) Typ
.250
(4.06)
.160
(1.02)
.040 (14.35)
.565
(8.38)
.330
(10.54)
.415
M12 P1
(19.4)
.764
(26.2)
1.031
Keyway
(15.4)
.606
(21.0)
.827
(2.0)
.079
(12.0)
.472
(48.1)
1.893
(10.3)
.406
(21.6)
.850
COM
1
(22.23)
.875
(28.4)
1.118
(28.83)
1.135
(7.85) Max
.309
(20.32)
.800
(27.0)
1.063
SCB26S15B-5CA
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
05-08
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