APEM · IS Series

IS15ABFP4ST

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MIL-DTL-3950 CE

IS 15mm Sealed Push Button MIL-SPEC

APEM IS Series Introduced circa 2000

APEM IS series sealed push button for military and aerospace applications.

Common Applications

Found on military aircraft instrument panels, naval command consoles, and armored vehicle dashboards. Sealed against sand, dust, salt fog, and temporary immersion. Designed to MIL-DTL-3950. If it needs to work in a war zone, this is the button.

Specifications

Actuator Function
Momentary
Certifications
MIL-DTL-3950, CE
Cutout Diameter
15mm
IP Rating
IP68
Material
Anodized aluminum
Mechanical Life
500,000 cycles
Max Operating Temp
85°C
Min Operating Temp
-55°C

Installation Quick Reference

Panel cutout: 15mm. Insert from the front of the panel, secure with mounting nut from behind (tighten to 2-3 Nm).

Contact block: Snap or screw the contact block onto the rear of the button body. Ensure the contact block orientation matches the wiring diagram — NO terminals are usually marked.

Wiring: Use 0.5-2.5mm² stranded wire with ferrules. Tighten screw terminals to 0.8 Nm. Test the button function before energizing the circuit.

Dimensions

Front 15mm cutout panel hole diameter Side panel contact ~45mm depth

Troubleshooting

Button doesn't respond when pressed

Check the contact block first — it's the most common failure point. Test continuity across the NO or NC terminals with a multimeter. If no click is felt, the return spring in the head may be broken.

Works intermittently

Contact block contacts are pitted or burned. Replace the contact block — don't try to file the contacts. Check if the rated cycle count has been exceeded.

Button feels mushy or doesn't click

The spring return mechanism in the button head is worn. Replace the head. The contact block can usually be reused if it tests OK.

Where to Buy

Price range

$3.56 — $48.63

across 2 distributors

Quick Specs

Actuator Function
Momentary
Certifications
MIL-DTL-3950, CE
Cutout Diameter
15mm
IP Rating
IP68
Material
Anodized aluminum

What People Are Saying

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“Found on military aircraft instrument panels, naval command consoles, and armored vehicle dashboards. Sealed against sand, dust, salt fog, and temporary immersion. Designed to MIL-DTL-3950. If it need”

Reddit r/MilitaryEngineering 35 upvotes View thread →