Series M
Miniature Pushbuttons
General Specifications
Electrical Capacity (Resistive Load)
Power Level (silver):
Logic Level (gold):
3A @ 125V AC & 2A @ 250V AC or 2A @ 30V DC
0.4VA maximum @ 28V AC/DC maximum (Applicable Range 0.1mA ~ 0.1A @ 20mV ~ 28V)
C
Other Ratings
Contact Resistance:
Insulation Resistance:
Dielectric Strength:
10 milliohms maximum for silver; 20 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
50,000 operations minimum
Mechanical Life:
Electrical Life:
25,000 operations minimum for silver; 50,000 operations minimum for gold
Nominal Operating Force:
Momentary Action: 1-pole 9.32N; 2-pole 16.18N; 4-pole 25.54N;
Alternate Action: 1-pole 4.41N; 2-pole 7.06N; 4-pole 11.77N
Slow make, slow break
Contact Timing:
Plunger Travel:
Pretravel:
Screw-on Cap (Mom.)
.028” (0.71mm)
.043” (1.09mm)
.071” (1.80mm)
Screw-on Cap (Alt.)
.110” (2.80mm)
.043” (1.09mm)
.153” (3.90mm)
Snap-on Cap (Mom. & Alt.)
.125” (3.19mm)
.050” (1.26mm)
Overtravel:
Total Travel
.175” (4.45mm)
Materials & Finishes
Plunger:
Bushing:
Brass w/nickel plating; polyacetal w/B1 bushing
Brass with nickel plating
Frame:
Stainless steel
Case:
Diallyl phthalate resin (UL94V-0)
Phosphor bronze with silver or gold plating
Silver alloy (code W); copper with gold plating (code G)
Silver with silver plating (code W); copper or brass with gold plating (code G)
Copper or brass with silver plating; copper or brass with gold plating
Movable Contactor:
Movable Contacts:
Stationary Contacts:
Terminals:
Environmental Data
Operating Temp Range:
Humidity:
–30°C through +85°C (–22°F through +185°F)
90 ~ 95% humidity for 96 hours @ 40°C (104°F)
Vibration:
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 5 shocks in each direction)
B3 & D3 bushing options equivalent to IP67
Shock:
Sealing:
Installation
Mounting Torque:
Cap Installation Force:
Soldering Time & Temp:
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 A in Supplement section.
Manual Soldering: See Profile A in Supplement section.
Process Seal:
These devices are not process sealed. Hand clean locally using alcohol based solution.
Standards & Certifications
Flammability Standards:
UL:
UL94V-0 case
Contact NKK Switches for UL or CUL marking option requirements.
C72
www.nkkswitches.com
11/17/23