Clamp-on Circuit Breaker Lockout Device – 120/277 Volt – 10 Pack

TRADESAFE clamp-on circuit breaker lockout devices provide a straightforward way to secure compatible single-pole 120/277V breakers in the off position during maintenance, repair, inspection, and electrical service work. This 10-pack is designed for breaker toggles measuring up to 5/8" wide by 1/2" thick, making it suitable for facilities that need multiple devices for recurring electrical isolation tasks.

Each device combines an impact-resistant, non-conductive nylon body with a clamp-style construction and extra-thick stainless steel clamping teeth that bite onto compatible breaker toggles to resist slipping and shifting. A steel thumbscrew with a nylon knob tightens by hand for tool-free installation. The integrated 19/64" shackle hole accommodates a compatible lockout padlock or hasp; padlock and hasp are sold separately. Cleats are included, while safety padlocks and hasps are sold separately.

Clamp-On Circuit Breaker Lockout for 120/277V Breakers

This clamp-on circuit breaker lockout is designed specifically for compatible single-pole breakers within the stated toggle dimensions. The thumbscrew mechanism allows the device to be tightened directly onto the breaker handle without additional installation tools, while the included cleat supports a secure fit on wider-spaced breaker poles.

Part number: TSMBRKR. Similar industry part number: 65396

Product specifications include:

• Quantity: 10 clamp-on breaker lockout devices
• Breaker compatibility: standard 120/277V single-pole circuit breakers
• Maximum compatible toggle width: 5/8"
• Maximum compatible toggle thickness: 1/2"
• Non-conductive nylon body
• Steel thumbscrew
• Cleats included
• Tool-free clamp-on installation
• Shackle hole diameter: 19/64"; use a compatible padlock or hasp
• LOTO padlocks and hasps are sold separately

Confirm the breaker type and toggle dimensions before ordering to ensure compatibility. This 10-pack is particularly useful for maintenance departments, electrical teams, and facilities that need identical lockout devices available across several panels or isolation points.

Single Pole Circuit Breaker Lockout with Tool-Free Thumbscrew

This clamp-on breaker lockout uses a steel thumbscrew with a nylon knob to tighten firmly around a compatible breaker toggle by hand, without a screwdriver or separate installation tool. The flip-up cover and built-in notch hold the device open during installation, while a stainless steel pivot supports smooth cover movement through repeated use. Once the cover is closed and secured with a personal safety padlock or hasp, the security shield limits access to the clamping screw during lockout.

Construction and installation features include:

• Tool-free steel thumbscrew mechanism
• Included cleat for wider-spaced breaker poles
• Impact-resistant nylon body
• Nonconductive construction
• Clamp-style attachment
• One integrated lockout point
• 19/64" shackle hole for a compatible padlock or hasp
• Compact format for electrical panels and maintenance kits

The combination of the clamp body, cleat, and thumbscrew allows the lockout to be tightened firmly onto compatible breaker handles before a padlock is applied. Because breaker designs and toggle dimensions vary, users should always verify the breaker configuration and measurements rather than selecting the device based on voltage alone.

Circuit Breaker Lockout for Electrical Maintenance and Isolation

These circuit breaker lockout devices are suited to maintenance departments, industrial facilities, commercial buildings, electrical service teams, and other workplaces where compatible 120/277V single-pole breakers need to remain secured during servicing. The compact design makes the devices easy to keep in a lockout station, electrical maintenance kit, service cart, or portable LOTO bag.

Installation starts by confirming the breaker type, toggle dimensions, and panel layout. Position the device over the compatible handle, tighten the thumbscrew until firmly seated, and close the cover. Then insert a compatible lockout padlock or hasp through the 19/64" shackle hole to restrict breaker operation until the authorized employee completes the work and removes the lock. Using a hasp allows multiple workers to secure the same breaker with individual locks. Padlocks and hasps are sold separately. The impact-resistant, non-conductive nylon body is built for the rough handling of daily industrial use. Its high-visibility safety-red color improves recognition of the lockout device at the isolation point.

To ensure compatibility, check out our Breaker Lock Solution Guidelines to find the right TRADESAFE Breaker Lockout Device for your specific breaker model and number of poles.

Choose the TRADESAFE 10-pack when you need multiple clamp-on devices for compatible single-pole circuit breakers across several panels or work areas. Verify the breaker toggle dimensions before use and pair each device with the safety padlock required by your facility. Keep electrical isolation equipment organized and ready for recurring maintenance tasks.

OSHA-Compliant Circuit Breaker Lockout Device

Compliance with the OSHA Standard for the Control of Hazardous Energy (Lockout/Tagout) (29 CFR 1910.147) is vital to the safety of every employee on site. That’s why we make sure that all of our products help workplaces remain OSHA-compliant.

TRADESAFE products are made with the requirements for lockout tagout devices in mind. These are the requirements pursuant to OSHA Standard 1910.147:

• Durable: Devices must be able to withstand exposure to the environment in which they will be used for as long as necessary.
• Standardized: Devices used in a facility must be standardized according to color, shape, or size.
• Substantial: Devices must be difficult to remove without the use of excessive force or techniques that are not typically used to remove the devices. They should also be able to prevent accidental removal.
• Identifiable: Devices must be able to identify the employee who applied them.
• Exclusive for Safety: Devices must not be used for any purpose other than controlling energy.

TRADESAFE: A Trusted USA-Based Partner in Lockout Tagout

• TRADESAFE is a USA-based company well-versed in OSHA regulations
• People-centered supplier of safety products
• High-quality products made of heavy-duty and durable materials
• Constant innovation and continuous adaptation to new standards

TRADESAFE is your partner in safety and we always keep the seriousness of that role in mind. That’s why all of our lockout tagout products are industrial-grade and meet regulatory standards. They are all ideal for use in the lockout of electrical and many other energy applications.

We don’t want to just be your supplier. We want to be your partner. For this reason, we approach things differently. Each and every day our team works to improve our products and the services we provide to the great people and businesses that put so much faith in us.

TRADESAFE is a USA-based company. This helps us stay up to date on the latest OSHA safety standards. We are inspired by the American worker and we are honored to help keep you safe from harm and hazards.