Circuit Breaker Lockout Device - Medium and Large Breakers - 20 Pack

TRADESAFE circuit breaker lockout devices provide a secure fit for compatible medium and large circuit breakers, including molded case circuit breakers (MCCBs), used in industrial and commercial electrical systems. This 20-pack is designed for qualifying single- and multi-pole breakers with handles up to 9/16" high and 3/8" thick, with no restriction on handle width, making the devices suitable for wider handles that may not fit conventional clamp-style breaker lockouts.

Each device combines an impact-resistant nylon body with a pointed brass thumbscrew, gripping jaw, and integrated anti-shift cleat. This configuration is designed to reach into deep or recessed toggle cavities and maintain a stable hold on compatible curved handles, flat handles with deep cavities, and long curved toggle strokes. Padlocks and hasps are sold separately.

Circuit Breaker Lockout Devices for Medium and Large Breakers

These circuit breaker lockout devices are engineered around breaker-handle dimensions rather than a fixed handle-width limit. They accommodate compatible handles up to 9/16" high and 3/8" thick while allowing wider breaker handles to pass through the open-sided body, making the design useful for qualifying medium and large breakers and MCCBs with challenging handle geometry.

Part number: TSMBRKR20. Similar industry part numbers: 873367, S2393, SFP110, 7110

Product specifications include:

• Quantity: 20 circuit breaker lockout devices
• Suitable for qualifying single-pole breakers
• Suitable for qualifying multi-pole breakers
• Compatible with qualifying molded case circuit breakers (MCCBs)
• Maximum breaker handle height: 9/16"
• Maximum breaker handle thickness: 3/8"
• No restriction on compatible handle width
• Jaw opening: 5/16"
• Premium impact-resistant nylon body
• Pointed brass thumbscrew tip
• Knurled brass screw for hand tightening
• Integrated anti-shift cleat
• Padlock or hasp hole diameter: 19/64"
• Operating temperature range: -49°F to 351°F (-45°C to 177°C)
• Padlocks and hasps sold separately

Breaker compatibility should still be verified before ordering because handle geometry can vary significantly even when nominal breaker size is similar. The device is particularly relevant for compatible curved handles, flat handles with recessed cavities, and longer curved toggle strokes where a conventional flat-jaw lockout may not establish a stable grip.

Lockout Devices for Circuit Breakers with Secure Screw-Clamp Design

These lockout devices for circuit breakers use a high-force screw-clamp mechanism to create a controlled grip on compatible breaker handles. The pointed brass thumbscrew reaches into deeper toggle cavities while the gripping jaw supports the opposite side, and the anti-shift cleat helps resist unwanted movement or pivoting after the device has been tightened.

Installation and retention features include:

• Tool-free hand-tightened thumbscrew
• Knurled brass screw head for easier grip
• Pointed screw tip for recessed toggle cavities
• Gripping jaw for controlled contact
• Integrated anti-shift cleat
• Open-sided design for wider compatible handles
• 19/64" shackle opening
• Compatible with qualifying LOTO padlocks or hasps
• Nonconductive nylon construction
• High-visibility red housing
• Designed for repeated installation and removal

To install the device, position it correctly on the compatible breaker handle and hand-tighten the brass thumbscrew until the lockout is firmly seated. The upper section can then be pivoted 90 degrees and secured through the 19/64" opening with the required padlock or hasp, preventing access to the clamping screw while the isolation point remains under lockout.

Circuit Breaker Lockout for Industrial Electrical Maintenance

This circuit breaker lockout is suited to electricians, maintenance departments, industrial facilities, commercial buildings, and service teams working with compatible medium and large breakers or MCCBs. Its open-sided construction and defined height and thickness limits make it especially useful where breaker handles are wider, curved, deeply recessed, or otherwise difficult to secure with more restrictive lockout designs.

The nylon body is designed for repeated use across a broad operating temperature range of -49°F to 351°F, while the brass screw and anti-shift mechanism provide a controlled mechanical connection at the breaker handle. Before each application, users should confirm the handle dimensions, breaker geometry, available clearance, and the correct isolation position required by the facility's established energy-control procedure.

Choose the TRADESAFE 20-pack when multiple compatible medium or large breaker isolation points need the same purpose-built lockout device. Verify the 9/16" height and 3/8" thickness limits before installation. Keep these circuit breaker lockouts stocked in electrical maintenance kits or lockout stations for recurring service work.

OSHA-Compliant LOTO Breaker Locks

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.