This document describes the electrical and mechanical specifications of the keyboard membrane products from apem.fr, including maximum voltage, maximum current, contact resistance, dielectric strength, insulation resistance, etc. It also includes static and dynamic mechanical specifications, as well as the dust and water resistance rating and lifespan of the products.
APEM offers five series of stainless‑steel keypads and keyboards designed for harsh environments. The series differ in key shape, size, and optional features such as laser marking, chemical etching, backlighting, and modular construction.
The document provides mechanical and electrical specifications—including contact force, travel, voltage, current, IP sealing, dielectric strength, and operating temperature—as well as configuration details like supply voltage options and LED backlight current limits.
| Contact force | 0.4‑0.5 N |
|---|---|
| Contact travel | 0.5 mm |
| Maximum voltage | 24 V |
| Maximum current | 50 mA |
| Contact resistance | < 10 Ω |
| Sealing (IP rating) | IP 5 |
| Dielectric strength | 250 V |
| Insulation resistance | > 100 MΩ |
| Operating temperature | -20 °C to +70 °C |
| Supply voltage options | 5 V, 12 V, 24 V DC |
| Backlit key max current (8 series) | 10‑40 mA |
| Backlit key max current (9 series) | 10‑20 mA |
The keypads are sealed to IP 5, and the track‑ball version meets IP 65.
Contact force ranges from 0.4‑0.5 N for some series, 1.5‑2 N for others, and up to 2.5‑4 N for the highest‑force models.
The devices can be powered from 5 V, 12 V, or 24 V DC.
For the 8 series the maximum is 10‑40 mA per key, while the 9 series allows 10‑20 mA.