ABB O4LE 1KHL015545R0001: Optical Arc Flash Sensor

Use Scenarios & Purpose

The ABB O4LE (1KHL015545R0001) is an optical arc flash sensor designed to provide ultra-fast detection of arc faults in electrical switchgear and power distribution systems. It plays a critical role in arc flash protection schemes by identifying intense light generated during an arc event and immediately triggering protective relays to minimize equipment damage and personal injury.

Typical use cases include:

Medium- and low-voltage switchgear

Motor control centers (MCCs)

Power distribution panels

Industrial substations

Critical infrastructure electrical rooms

Product Overview

The ABB O4LE is part of ABB’s arc protection sensor portfolio and is engineered for high sensitivity and reliability. Using optical detection technology, it responds to arc flash light within milliseconds, enabling rapid isolation of faults. Its compact and rugged design allows flexible installation even in confined electrical enclosures.

Key Advantages

Extremely fast arc flash detection for enhanced personnel safety

Optical sensing immune to electromagnetic interference

Compact design suitable for dense switchgear layouts

Seamless integration with ABB arc protection relays

Reliable operation in harsh industrial environments

Technical Characteristics 

The O4LE sensor detects visible light emitted by arc faults and transmits the signal via fiber optic or sensor cable to the arc protection relay. It operates without the need for external power at the sensing point, improving system safety and reliability. The sensor housing is designed to withstand high temperatures and mechanical stress typically present during electrical fault conditions.

Structure & Design

The sensor consists of a robust optical detection head enclosed in an industrial-grade casing. Its design allows directional or wide-area light detection depending on installation orientation. The connection interface ensures secure signal transmission to compatible ABB arc protection systems while maintaining high noise immunity.

Installation & Maintenance

Installation: The O4LE is mounted inside switchgear compartments using brackets or clips, positioned to ensure clear visibility of potential arc zones. Multiple sensors can be installed to provide complete coverage.

Maintenance: The sensor requires minimal maintenance. Periodic visual inspection to ensure cleanliness and correct positioning is recommended. No calibration is typically required during its service life.

Applications in Protection Systems

Arc flash protection schemes in industrial plants

Personnel safety enhancement in electrical installations

Fast fault clearance in power distribution networks

Retrofit projects upgrading legacy switchgear with arc protection

Why Choose ABB O4LE

Proven ABB technology for arc flash mitigation

Enhances safety compliance and reduces arc energy exposure

Easy integration into new or existing protection systems

Long service life with low total cost of ownership