Series MB2500 Snap-Action Pushbuttons General Specifications Electrical Capacity (Resistive Load) Power Level (code W): 3A 125V AC Logic Level (code G): 0.4VA maximum 28V AC/DC maximum (Applicable Range 0.1mA ~ 0.1A 20mV ~ 28V) Logic/Power Level (code A): Combines W & G ratings Note: See Supplement section to find explanation of operating range. C Other Ratings Contact Resistance: 20 milliohms maximum for silver 30 milliohms maximum for gold Insulation Resistance: 1,000 megohms minimum 500V DC Dielectric Strength: 1,000V AC minimum between contacts for 1minute minimum 1,500V AC minimum between contacts & case for 1minute minimum Mechanical Life: 200,000 operations minimum Electrical Life: 25,000 operations minimum for silver 100,000 operations minimum for gold Nominal Operating Force: Single pole 2.45N double pole 3.92N Travel: Pretravel .024 (0.6mm) Overtravel .016 (0.4mm) Total Travel .039 (1.0mm) Materials & Finishes Plunger: Brass with nickel plating Bushing: Brass with nickel plating Mounting & Body Frames: Stainless steel Support Bracket: Brass with tin plating Case: Polybutylene terephthalate (PBT) (UL94V-0) Base: Diallyl phthalate resin Movable Contactor: Phosphor bronze with silver or gold plating Movable Contacts: Silver alloy (code W) copper with gold plating (code G) Stationary Contacts: Silver with silver plating (code W) copper or brass with gold plating (code G) Terminals: Copper with silver plating copper or brass with gold plating Environmental Data Operating Temp Range: 30C through +85C (22F through +185F) Humidity: 90 ~ 95% humidity for 100 hours 40C (104F) 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 2 Shock: 50G (490m/s ) acceleration (tested in 6 right angled directions, with 5 shocks in each direction) Installation Mounting Torque: 1.5Nm (13 lbin) for double nut 0.7Nm (6 lbin) for single nut Cap Installation Force: 80N (18 lbf) maximum downward force on actuator Processing Soldering: Wave Soldering Recommended: See Profile B in Supplement section. Manual Soldering: See Profile B in Supplement section. Cleaning: These devices are not process sealed. Hand clean locally using alcohol based solution. Standards & Certifications Flammability Standards: UL94V-0 Case UL : File No. E44145 - Recognized only when ordered with marking on switch. Add /U or /CUL before dash in part number to order UL recognized switch. All single & double pole models recognized at 3A 125V AC or 0.4VA max. 28V AC/DC max. CSA: File No. 023535 0 000 - Certified only when ordered with marking on switch. Add /C before dash in part number to order CSA certified switch. Single pole & double pole models certified at 3A 125V AC or 0.4V A max. 28V AC/DC max. C116 www.nkkswitches.com 11/10/20 Supplement Accessories Indicators Touch Tilt Tactiles Slides Rotaries Keylocks Programmable Illuminated PB Pushbuttons Rockers TogglesSnap-Action Pushbuttons Series MB2500 Distinctive Characteristics Short stroke and light touch. Antijamming design protects contacts from damage due to excessive downward force on the actuator. C High torque bushing construction prevents rotation or separation from frame during installation. Stainless steel frame resists corrosion. Longer center solder lug terminal simplifies wiring and soldering. Patented silver contacts of specially composed alloy for hardness. Epoxy sealed terminals prevent entry of solder flux and other contaminants. Snap-acting mechanism gives smooth actuation and audible feedback. Prominent external insulating barriers increase insulation resistance and dielectric strength. Bushing Mount Page C118 Actual Size Bracket PC Mount Page C121 Snap-in Mount Page C124 www.nkkswitches.com C117 Supplement Accessories Indicators Touch Tilt Tactiles Slides Rotaries Keylocks Programmable Illuminated PB Pushbuttons Rockers Toggles