Snap-Action Pushbuttons
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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:
[email protected] • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
03-07
Snap-Action Pushbuttons
Series MB2400
General Specifications
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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/s2) 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:
[email protected] • Phone (480) 991-0942 • Fax (480) 998-1435 • www.nkkswitches.com
Snap-Action Bushing Mount
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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” (19.0.