Snap-Action Pushbuttons
Series MB2400
Distinctive Characteristics
Snap-acting mechanism gives smooth actuation, short stroke,
light touch, and audible feedback. This mechanism also provides
long mechanical life.
High torque bushing construction prevents rotation or separation
from frame during installation.
Antijamming design protects contacts from damage due to
excessive downward force on the actuator.
Compatible companions with M series toggles. Body,
bushing, and footprint dimensions ideal for mounting
MB2400 pushbuttons and M toggles next to one another.
Stainless steel frame resists corrosion.
Longer center solder lug terminal simplifies wiring and
soldering.
Silver contacts of specially composed alloy for hardness.
Epoxy sealed terminals prevent entry of solder flux and other
contaminants.
Prominent external insulating barriers increase insulation resistance
and dielectric strength.
Actual Size
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
03-07
Snap-Action Pushbuttons
Series MB2400
General Specifications
Electrical Capacity (Resistive Load)
Power Level (code W):
Logic Level (code G):
Logic/Power Level (code A):
3A @ 125V AC
0.4VA maximum @ 28V AC/DC maximum (Applicable Range 0.1mA ~ 0.1A @ 20mV ~ 28V)
Combines W & G ratings
Note: Find additional explanation of dual rating & operating range in Supplement section.
Other Ratings
Contact Resistance:
Insulation Resistance:
Dielectric Strength:
Mechanical Life:
Electrical Life:
Nominal Operating Force:
Travel
20 milliohms maximum for silver; 30 milliohms maximum for gold
1,000 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
200,000 operations minimum
25,000 operations minimum for silver; 100,000 operations minimum for gold
Single pole 2.45N; double pole 3.92N
Pretravel .024” (0.6mm); Overtravel .016” (0.4mm); Total Travel .039” (1.0mm)
Materials & Finishes
Plunger:
Bushing:
Frame:
Case:
Base:
Movable Contactor:
Movable Contacts:
Stationary Contacts:
Terminals:
Brass with nickel plating
Brass with nickel plating
Stainless steel
Polybutylene terephthalate (PBT)
Diallyl phthalate resin
Phosphor bronze with silver or gold plating
Silver alloy (code W); copper with gold plating (code G); or silver alloy with gold plating (code A)
Silver alloy with silver plating (code W); copper or brass with gold plating (code G); or
silver with gold plating (code A)
Copper or brass with silver plating; copper or brass with gold plating
Environmental Data
Operating Temp Range:
Humidity:
Vibration:
Shock:
–30°C through +85°C (–22°F through +185°F)
90 ~ 95% humidity for 96 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 3 shocks in each direction)
Installation
Mounting Torque:
Cap Installation Force:
Soldering:
Cleaning:
1.5Nm (13.0 lb
•
in) for double nut; 0.7Nm (6.0 lb
•
in) for single nut
80.0N (18.0 lbf) maximum downward force on actuator
Wave Soldering (PC version): See Profile B in Supplement section.
Manual Soldering: See Profile B in Supplement section.
These devices are not process sealed. Hand clean locally using alcohol based solution.
See Cleaning Specifications in Supplement section.
Standards & Certifications
Flammability Standards:
UL & C-UL Recognized:
R
CSA Certified:
UL94V-0 available
All single and double pole models recognized at 3A @ 125V AC or 0.4VA max. @ 28V DC max;
UL File No. WOYR2.E44145; add “/U” to end of part number to order UL mark on switch
C-UL File No. WOYR8.E44145; add “/C-UL” to end of part number to order C-UL mark on switch.
Single pole models with PC, solder lug, or Wirewrap terminals & double pole with PC or
Wirewrap terminals certified at 3A @ 125V AC or 0.4VA @ 28V maximum;
CSA File No. 023535-0-000; add “/C” to end of part number to order CSA mark on switch.
03-07
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
Snap-Action Bushing Mount
Series MB2400
F
CAPS
F
H
.201” (5.1mm)
Diameter
.295” (7.5mm)
Diameter
TYPICAL SWITCH ORDERING EXAMPLE
MB24
POLES & CIRCUITS
11
61
SPDT
DPDT
ON
ON
11
E1
W
01
A
(ON)
(ON)
CONTACT MATERIALS
& RATINGS
W
G
Silver
Rated 3A @ 125V AC
Gold
Rated 0.4VA max @
28V AC/DC max
Gold over Silver
Rated 3A @ 125V AC
& 0.4VA max @ 28V
AC/DC max
( ) = Momentary
A
BUSHINGS
E1
E2
A1
A2
S1
S2
.285” (7.24mm)
Threaded with D Flat
.285” (7.24mm)
Smooth with D Flat
.280” (7.1mm)
Threaded with Keyway
.280” (7.1mm)
Smooth with Keyway
.350” (8.9mm)
Threaded with Keyway
.350” (8.9mm)
Smooth with Keyway
01
03
05
06
07
CAP COLORS
A
B
C
Black
White
Red
TERMINALS
Solder Lug
.250” (6.35mm) Straight PC
.425” (10.8mm) Wirewrap
.750” (19.05mm) Wirewrap
.964” (24.5mm) Wirewrap
IMPORTANT:
Switches are supplied without UL,
C-UL, & CSA markings unless
specified. Specific models & rat-
ings noted on General Specifica-
tions page.
DESCRIPTION FOR TYPICAL ORDERING EXAMPLE
MB2411E1W01-FA
Black .201” (5.1mm) Diameter Cap
.285” (7.24mm) Threaded Bushing
with D Flat
SPDT ON-(ON) Circuit
Silver Contacts with
3-Amp Rating
Solder Lug Terminals
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
03-07
Snap-Action Bushing Mount
POLES & CIRCUITS
Plunger Position
( ) = Momentary
Normal
Pole
SP
Model
MB2411
Keyway
Series MB2400
Throw & Switch Schematics
Note: Terminal numbers are
not actually on the switch.
1 (COM)
Connected Terminals
Normal
Keyway
Down
Down
ON
(ON)
1-3
1-2
SPDT
3
1 (COM)
3
2
6
2
4
5
DP
MB2461
ON
(ON)
1-3 4-6
1-2 4-5
DPDT
BUSHINGS
Note: Plunger selection is not required for MB2400 pushbuttons. The plunger can be used with or without a cap.
E1
.285” (7.24mm)
Threaded with D Flat
A1
.280” (7.1mm)
Threaded with Keyway
(0.8)
.031
S1
(0.8)
.031
(8.0) Dia
.315
(0.9)
.035
.350” (8.9mm)
Threaded with Keyway
1/4-40 Thd
(2.84) Dia
.112
(8.0) Dia
.315
(2.5)
.098
(0.9)
.035
1/4-40 Thd
(2.84) Dia
.112
(2.5)
.098
(5.54) (7.1)
.218 .280
1/4-40 Thd
(2.84) Dia
.112
(2.5)
.098
(5.54)
.218
(8.9)
.350
(0.9)
.035
(8.0) Dia
.315
(5.54) (7.24)
.218 .285
Maximum Panel Thickness with
Standard Hardware: .068” (1.74mm)
.285” (7.24mm)
Smooth with D Flat
Maximum Panel Thickness with
Standard Hardware: .068” (1.74mm)
.280” (7.1mm)
Smooth with Keyway
(6.2) Dia
.244
(2.84) Dia
.112
(2.5)
.098
(5.54) (7.1)
.218 .280
(0.9)
.035
Maximum Panel Thickness with
Standard Hardware: .134” (3.40mm)
.350” (8.9mm)
Smooth with Keyway
E2
A2
S2
(0.8)
.031
(8.0) Dia
.315
(6.2) Dia
.244
(2.84) Dia
.112
(8.0) Dia
.315
(2.5)
.098
(0.9)
.035
(0.8)
.031
(8.0) Dia
.315
(6.2) Dia
.244
(2.84) Dia
.112
(2.5)
.098
(5.54)
.218
(8.9)
.350
(0.9)
.035
(5.54) (7.24)
.218 .285
Panel Cutouts
For A1, A2, S1, or S2 Bushing
with Keyway
For E1 or E2 Bushing
with D Flat
With
Optional Locking Ring
(5.6)
.220
(6.5) Dia
.256
(0.6)
.024
(6.5) Dia
.256
(5.8)
.228
Standard hardware includes 2 hex nuts & 1 lockwasher.
Hardware is illustrated following the Typical Switch Dimension drawings.
(6.5) Dia
.256
(2.2) Dia
.087
(6.5)
.256
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
03-07
Snap-Action Bushing Mount
CONTACT MATERIALS & RATINGS
W
G
Silver over Silver
Power Level
Series MB2400
3A @ 125V AC
Gold over Brass or Copper
Logic Level
0.4VA maximum @ 28V AC/DC maximum
Note: Complete explanation of operating range in Supplement section.
A
Gold over Silver
Power Level
or Logic Level
3A @ 125V AC
or 0.4VA maximum @ 28V AC/DC maximum
Note: This dual rated option is suitable when two or more identical switches are used in logic and in power circuits
within the same application. See Supplement section for complete explanation of dual rating and operating range.
TERMINALS
01
Solder Lug
03
.250” (6.35mm)
Straight PC
05
06
07
.425” (10.8mm)
Wirewrap or Extended PC
.750” (19.05mm)
Wirewrap or Extended PC
.964” (24.5mm)
Wirewrap or Extended PC
Epoxy Seal
(2.0)
.079
(4.0)
.157
Epoxy Seal
(6.35)
(4.8) .250
.189
(2.0)
(1.1) .079
.043
Thk = (0.8)
.031
(1.17)
.046
Thk = (0.8)
.031
3
2
1
3
(4.8)
.189
6
5
4
(4.7) Typ
.185
(1.8) Dia Typ
.073
2
1
(4.7) Typ
.185
Refer to the
footprints if using
as extended PC
terminal.
Dimension A =
terminal lengths as
shown beside the
code boxes above.
Epoxy Seal
A
(1.27)
.050
Thk = (0.8)
.031
(1.8) Dia Typ
.073
Single Pole
Double Pole
CAPS & CAP COLORS
F
AT475
.201” (5.1mm)
Diameter Cap
H
(5.1) Dia
.201
(6.4)
.253
(4.0)
.157
AT496
.295” (7.5mm)
Diameter Cap
(7.5) Dia
.295
(6.4)
.253
(4.0)
.157
Material: Polyamide
Finish: Glossy
Material: Polyamide
Finish: Glossy
Cap Colors
Available:
A
Black
B
White
C
Red
NKK Switches • email: sales@nkkswitches.com • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
03-07
