Basic Description

• Switch Type: Momentary push button (returns to the original position when released)

• Contact Configuration: Usually SPST (Single Pole Single Throw), Normally Open (NO)

• Actuator: Round plastic/plastic‑metal mix button cap

• Mounting Method: Panel‑mount (commonly press-in or threaded bushing, depending on variant)

• Terminals: Solder lugs or quick‑connect tabs (some variants may have PCB pins)

Typical Electrical Ratings

These ratings can vary slightly by manufacturer. Always consult the datasheet from the specific vendor for exact values.

• Rated Voltage (AC): 125 VAC or 250 VAC (common ratings are 125 VAC @ 6 A, 250 VAC @ 3 A)

• Rated Voltage (DC): Often specified up to 12 VDC or 24 VDC at a few amps (e.g., 12 VDC @ 6 A max is common for many push buttons)

• Contact Resistance: Typically ≤ 50 mΩ (milliohms) initial

• Insulation Resistance: ≥ 100 MΩ at 500 VDC

• Dielectric Strength: Around 1000–1500 VAC for 1 minute (between terminals and housing)

Mechanical Specifications

• Mounting Hole Diameter: Commonly 10 mm or 12 mm (sometimes called “12 mm push button”), though smaller or larger variants exist

• Panel Thickness Support: Typically up to ~2–4 mm depending on the retaining mechanism

• Actuator Shape: Round, slightly domed head

• Switch Operation: Momentary (push to make, release to break)

• Mechanical Life: Often 10,000 – 50,000 cycles (minimum) for budget-friendly switches; higher-quality switches may specify 100,000+ cycles

Dimensions

While the exact dimensions differ by manufacturer, the following approximate values apply to many PBS‑111‑style switches:

• Overall Diameter (Top): ~ 13–14 mm

• Button (Actuator) Diameter: ~ 7–9 mm

• Bushing/Collar Diameter: ~ 10–12 mm (designed for a 10–12 mm mounting hole)

• Switch Body Length (Behind Panel): ~ 25–30 mm (depending on terminal type)