Master Circuit Breaker Lockout

Overview

The Master Circuit Breaker Lockout (470-493B) is designed for lockout/tagout (LOTO) procedures on standard toggle-style circuit breakers, providing a secure method to prevent unauthorized or accidental re-energization during electrical maintenance and servicing operations.

Technical Features

• 120/277 V voltage rating: Compatible with both standard 120 V residential and 277 V commercial/industrial single-pole toggle breakers, broadening application range across facility types.
• 3/4 in breaker width compatibility: Precisely sized to fit standard toggle-style circuit breakers, ensuring a secure grip-tight fit that resists unintended removal.
• Grip Tight design: Clamps firmly onto the breaker toggle to minimize movement and maintain a consistent lockout position throughout the duration of a maintenance procedure.
• Red color coding: Internationally recognized red coloration signals a locked-out, de-energized state, supporting visual identification and compliance with LOTO communication standards.
• Lightweight construction at 0.13 lb: Minimal weight makes the device easy to carry in a LOTO kit or tool bag without adding burden to technicians working across multiple lockout points.

Applications

• Lockout/tagout compliance procedures on standard toggle circuit breakers in residential, commercial, and light industrial electrical panels.
• Electrical maintenance and servicing where breakers rated at 120 V or 277 V must be isolated and secured against accidental re-energization.
• Use by electricians, maintenance technicians, and facility managers to meet OSHA 29 CFR 1910.147 control of hazardous energy requirements.
• Integration into portable LOTO kits where compact, lightweight lockout devices are required for multiple work locations.