Product Description
Benefits & Applications
The Schneider Electric ZB4BZ102 is a reliable 1NC (Normally Closed) auxiliary contact block designed for use with Harmony XB4 metal pushbuttons, selector switches, and operator devices. Engineered for durability and long electrical life, the ZB4BZ102 provides dependable signal switching in safety circuits, stop functions, interlocks, and PLC input logic where a normally closed contact is required.
The unit easily snaps onto the back of compatible XB4 operator heads, enabling quick installation or replacement without modifying the main device. This makes it ideal for OEM machine builders, panel manufacturers, and maintenance technicians working in industrial automation and building control environments.
Typical Applications
- Stop functions and safety interlocks
- PLC input and automation feedback circuits
- Motor starter auxiliary signaling
- Industrial control stations and OEM operator panels
- Emergency stop and mushroom-head operator assemblies
Technical Advantages
- 1 Normally Closed (1NC) auxiliary contact
- High mechanical endurance for demanding applications
- Tool-free snap-on installation
- Reliable switching for low-voltage PLC and control circuits
- Robust construction suitable for industrial environments
- Compatible with XB4 and XB5 operator families
Compatibility Notes
The ZB4BZ102 is designed to integrate with Schneider Electric’s Harmony XB4 metal operator range, and is also compatible with:
- Harmony XB5 plastic operator heads (with adapter)
- Pushbuttons and selector switches (illuminated and non-illuminated)
- Key switches and emergency stop units
- Control stations and modular operator panels
If your application requires a robust 1NC auxiliary contact for XB4/XB5 operators, the ZB4BZ102 is the correct Schneider OEM accessory.
Frequently Asked Questions
Q: What does “1NC” mean for the ZB4BZ102?
“1NC” means the contact is Normally Closed — it opens when the pushbutton or switch is actuated. This configuration is commonly used for stop and safety circuits.
Q: Is the ZB4BZ102 compatible with Harmony XB4 operators?
Yes. It is designed specifically for Harmony XB4 metal pushbuttons and selector switches.
Q: Can I use this with XB5 operators?
Yes. The ZB4BZ102 works with Harmony XB5 plastic operators when used with the appropriate mounting adapter.
Q: Can multiple auxiliary contacts be stacked?
Yes. Schneider allows stacking ZB4BZ101 (NO) and ZB4BZ102 (NC) blocks to build multi-contact control logic.
Q: What is the difference between ZB4BZ101 and ZB4BZ102?
ZB4BZ101 provides a 1NO (Normally Open) contact.
ZB4BZ102 provides a 1NC (Normally Closed) contact.
They are often paired together in start/stop or safety applications.
