Limit Switches
⚡ Limit Switch
A limit switch
is an electromechanical position‑detection device
that uses a mechanical actuator(plunger, roller, lever, etc.) to open or close electrical contacts
when a moving machine part reaches a defined position.
It is one of the most widely used industrial sensors for presence, absence, end‑of‑travel, and positioning
detection.
Your uploaded XC document states:
“ Limit switches are used in all automated installations… presence/absence, passing, positioning, end of travel. ”
“ NC contacts with positive opening operation… high resistance to industrial conditions. ”
🔧 Key Features
- Electromechanical detection — Mechanical actuator + electrical contacts.
- Positive opening NC contacts — Guaranteed contact separation for safety (IEC 60947‑5‑1).
- Multiple actuator types — Plunger, roller plunger, roller lever, rod lever, multi‑directional.
- High durability — Millions of mechanical cycles depending on the model.
- High switching capacity — AC‑15 / DC‑13 categories (A300, B300, Q300, R300).
- Immunity to electromagnetic interference — Galvanic isolation.
- IP66/IP67 protection — Suitable for harsh industrial environments.
- Modular or complete versions — Replaceable heads, bodies, and contact blocks.
The catalogue confirms:
“ Total immunity to electromagnetic interference. ”
“ High resistance to ambient industrial conditions. ”
🧩 Telemecanique XC Limit Switch Families
Standard Range
- XCKP — Compact plastic, EN 50047
- XCKD — Compact metal, EN 50047
- XCKT — Compact plastic, 2 cable entries
- XCKM / XCKL — Classic metal format
- XCKJ — Industrial metal, EN 50041
- XCMD — Miniature metal
- XCMH — Miniature plastic
- XCMV — Mobile equipment, IP69
Safety Range
- XCS — Safety limit switches for guard doors and operator protection.
🏭 Typical Applications
- End‑of‑travel detection — Stops or reverses machine motion.
- Positioning — Detects the mechanical position of moving parts.
- Presence/absence detection — Confirms object arrival or departure.
- Safety interlocking — XCS range for guard doors.
- Conveyor systems — Jam detection, alignment, and diverter control.
- Cranes & hoists — Upper/lower travel limits.
- Packaging machines — Cam‑based actuation for timing and sequencing.
⭐ One‑line summary
A limit switch is an electromechanical device that detects mechanical position or end‑of‑travel using a physical actuator and electrical contacts, widely used for reliable industrial automation.
