Overview
The Schneider Electric ZCMD21 is a miniature limit switch body designed as the contact carrier half of the two-piece Telemecanique Limit switches XC Standard modular system. This snap action body pairs with XCMD actuator heads that remain mounted on machine structure during the equipment service life. The ZCMD21 body contains the electrical switching contacts and is engineered for field replacement without head removal or rewiring disruption. Built with Zamak alloy housing and silver-plated contacts, it delivers reliable position sensing for industrial automation, machine guards, and process interlocks.
Key Features
- Modular Design: Swap-in body designed to replace contacts while keeping XCMD head in place on machine structure
- Snap Action Contacts: Positive opening mechanism ensures reliable contact opening in safety-critical circuits; NC contact forced open by spring mechanism rather than released
- 1NC + 1NO Configuration: Two-pole contact set (one normally closed, one normally open) for versatile circuit logic and interlock applications
- Silver-Plated Contacts: Zamak alloy body with noble metal contacts for durability and low contact resistance in harsh environments
- Plug-In Connection: No pre-cabled or hardwired terminals; field-installable electrical connections simplify installation and inventory management
- IP66 Enclosure Rating: Sealed design protects against dust and water ingress in wet, dirty, or outdoor equipment applications
Technical Specifications
- Contact Configuration: 1NC + 1NO (two-pole)
- Contact Operation: Snap action (positive opening)
- Current Rating (AC): 1.5A maximum at AC-15 (IEC 60947-5-1)
- Voltage Rating (AC): 240V maximum
- Body Material: Zamak alloy with silver-plated contacts
- Design Type: Miniature, plug-in body
- Electrical Connection: Plug-in without pre-cabled connection
- Dimensions: Approximately 40mm W × 65mm H
- Degree of Protection: IP66
- Product Range: Telemecanique Limit switches XC Standard
- Minimum Actuation Speed: 0.01 m/s
- Rated Insulation Voltage: 300V
- Impulse Withstand Voltage: 6kV
Typical Applications
- Machine Safety Interlocks: Guard and access door interlock circuits where positive contact opening is required by safety standards
- Position Detection: End-of-stroke and intermediate position sensing on linear actuators, conveyors, and automated machinery
- Process Logic Control: Industrial control circuits using modular limit switch systems for flexibility and field serviceability
- Emergency Stop Integration: Limit switch logic feeding safety relay circuits or PLC discrete inputs in emergency shutdown sequences
- Field Replacement: Direct swap-in for worn or failed ZCMD21 bodies in existing XCMD modular switch installations
Compatibility & Replacements
Compatible With
- Schneider Electric XCMD series limit switch heads (verify XCMD label on actuator head before ordering—XC legacy heads are mechanically incompatible)
- Telemecanique modular switch systems
- OsiSense XC Standard product range industrial controllers
- Industrial electrical circuits using 1.5A AC-15 rated contacts
Replaces / Drop-In Replacement For
- Worn or failed ZCMD21 switch bodies in existing Telemecanique XCMD installations
- Original equipment manufacturer replacements for machines using Schneider Telemecanique limit switch systems
- Field service upgrades from older ZCMD21 units to new surplus stock
Works With
- Telemecanique XCMD actuator heads (ZCE series and compatible variants)
- Schneider Electric relay and PLC discrete input circuits
- Industrial safety systems requiring snap action positive opening
- Standard three-phase and single-phase industrial motor control circuits
