The Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly stands out as a durable, versatile, and globally certified pilot light solution designed for high-performance industrial environments. As part of the renowned Harmony XB4 series, this 22 mm metal pilot light body integrates exceptional design and electrical safety, ensuring reliable visual indication in control panels, machinery, and automation systems.
Whether you are designing a control system, upgrading operator interfaces, or maintaining electrical panels, understanding the full potential of this product helps maximize reliability, compliance, and user safety.
What is the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly?
The Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly is a complete pilot light module composed of a metal fixing collar, light block, and transformer. Engineered for a 22 mm panel cutout, it serves as the essential base and lamp-holder for Harmony XB4 pilot light heads. The assembly’s integrated step-down transformer enables it to operate directly from high-voltage AC sources (up to 400 VAC) while maintaining a safe 6 V bulb circuit—a unique feature that enhances safety and lamp longevity.
This component is ideal for environments requiring robust construction, easy maintenance, and high ingress protection. Designed from Zamak (zinc alloy) metal, the assembly combines mechanical strength with corrosion resistance, ensuring dependable performance even in harsh or humid industrial settings.
Technical Features of the Harmony XB4 ZB4BV5 Light Block Assembly
The Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly is part of the Harmony XB4 22 mm metal pushbutton and pilot device range, renowned for its modularity and industrial-grade endurance. Below are its key specifications and features that define its superior design and reliability.
Construction and Design
- Series and Type: Harmony XB4 metal range (22 mm)
- Assembly Includes: Light block, metal fixing collar, and lamp-holder
- Material: Zamak (zinc alloy) for durability and secure panel mounting
- Mounting: Fits standard 22 mm panel holes; front mounting with rear locking collar
- Dimensions: 30 mm (width) × 47 mm (height) × 60 mm (depth)
- Weight: Approximately 0.13 kg
This compact yet rugged structure ensures compatibility with a wide range of operator heads and pilot light lenses, making it an integral component in modern control panels.
Electrical and Mechanical Specifications
- Rated Operational Voltage (Us): 400 VAC (via internal transformer)
- Rated Insulation Voltage (Ui): 600 V
- Impulse Withstand Voltage (Uimp): 6 kV (compliant with IEC 60947-1)
- Transformer Power: 1.2 VA, stepping down to 6 V lamp voltage
- Light Source: Replaceable BA9s miniature bulb (6 V incandescent or LED)
- Terminal Type: Screw clamp (accepts up to 2×1.5 mm² conductors)
- Recommended Torque: 0.8–1.2 N·m
- Finger-Safe Rating: IP20 (wiring side)
The internal transformer design is especially advantageous—it allows the device to be wired directly into 400 VAC mains systems, eliminating the need for a separate control transformer.
Environmental Resistance and Safety Compliance
Reliability under extreme conditions is a hallmark of the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly. The unit operates efficiently between -40°C and +55°C, with a storage capacity up to +70°C. It carries TH tropicalization treatment, providing excellent humidity resistance.
Its resistance to vibration (up to 5 g) and shock (up to 30 g) ensures dependable operation in high-vibration industrial or transport environments. When combined with compatible lens heads, the front face of the assembly achieves IP66, IP67, and IP69K protection—making it suitable for outdoor or washdown applications.
As Class I equipment under IEC 60536, all exposed metal parts must be grounded. A dedicated grounding screw ensures electrical safety and electromagnetic compatibility (EMC) protection.
Certifications and Global Approvals
The Harmony XB4 ZB4BV5 Light Block Assembly meets a wide array of international safety and performance standards, ensuring it can be deployed confidently in industrial systems worldwide.
- Compliance: Low-voltage switchgear and controlgear – Part 1: General rules (IEC 60947‑1)
- UL Listing: UL 508 (File #E164353)
- CSA Certification: C22.2 No.14
- CE Marked (European Union conformity)
- JIS C8201 Standard (Japan)
- Marine Certifications: Lloyd’s Register, DNV, Bureau Veritas, GL, RINA
- Green Premium Certified: RoHS compliant and eco-designed
- Warranty: 18 months (manufacturer-backed)
These certifications confirm that the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly is not only rugged but environmentally responsible, supporting sustainability goals while meeting industrial-grade reliability.
Compatible Accessories and Components
The Harmony XB4 range is modular, allowing seamless integration of components. The ZB4BV5 light block can be paired with various accessories for customized applications.
Pilot Light Heads
Attach a 22 mm Harmony XB4 pilot light head (lens) to the front of the panel to complete the assembly. These are available in multiple colors—red, green, amber, blue, and white—and styles, such as flush or protruding. A common compatible option is ZB4BV03 (green lens head).
Light Bulbs
The unit supports BA9s miniature bulbs, typically 6 V, 1.2 W incandescent. Users can also install 6 V BA9s LED replacements for energy efficiency and longer lifespan.
Replacement and Mounting Accessories
- Fixing Collar: ZB4BZ009 (metal mounting collar replacement)
- Legend Plates: Optional snap-on labels for function identification
- Protective Covers: Added for enhanced front protection and labeling clarity
All components within the Schneider Electric Harmony XB4 system share uniform mounting dimensions, ensuring easy upgrades or replacements.
Alternative Models and Voltage Options
Schneider Electric offers several variants of the Harmony XB4 light block assembly to suit different electrical configurations:
- ZB4BV3: For 110–120 VAC systems with integrated transformer
- ZB4BV4: For 230–240 VAC systems
- ZB4BV6: Full-voltage model (no transformer) for direct 24–250 VAC operation
- LED Models (ZBVB1, ZBVM6): LED-illuminated variants for higher efficiency and longevity
- Plastic Series (XB5): Cost-effective, non-metal alternative using similar 22 mm cutouts
These models allow users to adapt the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly family to a wide variety of voltage standards and application preferences.
Installation and Wiring Guide
Mounting the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly is designed for simplicity and safety. Follow these steps for proper installation:
- Prepare the Panel: Drill a 22.5 mm hole in the panel. Ensure power is isolated.
- Insert the Head: Fit the pilot light head from the front side of the panel.
- Attach the Collar: From behind, snap the ZB4BV5’s metal collar onto the head until it locks.
- Secure and Ground: Tighten the locking/ground screw (~0.8 N·m torque).
- Attach the Light Block: Engage the lower lug into the collar slot, then pivot upward until it clicks.
- Install the Bulb: Insert the 6 V BA9s lamp or LED equivalent.
- Connect the Wires: Terminals accept 1 or 2 wires (up to 2×1.5 mm²). Connect L and N terminals (non-polarized for AC).
- Test the Unit: Energize the circuit and confirm proper illumination.
The assembly’s snap-fit mechanism enables tool-free maintenance, allowing for quick bulb replacement or block detachment without removing the front head.
Industrial Applications of the Harmony XB4 ZB4BV5 Light Block Assembly
The Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly is a trusted choice across numerous industrial sectors thanks to its high voltage handling and environmental durability.
1. Control Panels and Operator Consoles
Used for visual indication in automated systems—status lights, power ON indicators, and fault alerts. Its high ingress protection ensures long-term reliability even in outdoor or dusty environments.
2. Motor Starters and MCCs
Commonly used in Motor Control Centers to display motor running status, faults, or phase presence on 380–415 VAC systems.
3. Switchgear and Distribution Boards
Ideal for main voltage indication or feeder presence without external transformers—especially suitable for retrofits.
4. Transportation and Marine Applications
Certified for shipboard and offshore use, making it reliable for marine control systems and mobile industrial platforms.
5. OEM Machine Building
Preferred by machinery manufacturers for its modularity, aesthetics, and quick maintenance design.
Why Choose the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly?
When selecting pilot lights, engineers prioritize durability, compatibility, and safety. The Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly excels in all three:
- Built with metal construction for superior strength and industrial aesthetics
- Direct connection to 400 VAC without additional transformers
- Compliance with major global certifications
- Modular Harmony design for ease of customization
- LED compatibility for sustainable performance
This combination of features provides exceptional value for professionals seeking long-lasting performance in industrial control and automation systems.
Related Product Collections ➜
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Upgrade your automation systems with our range of PLCs, modules, and control accessories—perfect for building smarter, interconnected control panels.
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Conclusion: Building Reliable Control Panels with Harmony XB4
The Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly represents the perfect blend of safety, design, and functionality. Whether you’re upgrading your facility’s control panels, building new automation systems, or replacing outdated indicator lights, this Harmony module offers an easy-to-install, globally compliant, and environmentally responsible solution.
Learn more about pilot lights and indicator lights in industrial automation to understand how the Schneider Electric Harmony XB4 ZB4BV5 Light Block Assembly can enhance your next industrial project.
