Circuit Breaker Lockout Device - Medium and Large Breakers - 5 Pack

TRADESAFE circuit breaker lockout devices are designed for compatible medium- and large-sized circuit breakers, including molded case circuit breakers (MCCBs), used across industrial and commercial electrical systems. This 5-pack accommodates qualifying single- and multi-pole breaker handles up to 9/16" high and 3/8" thick without imposing a handle-width restriction, making the design useful for wider breaker handles that may not fit more restrictive lockout styles.

Each device combines an impact-resistant nylon body with a pointed brass thumbscrew, gripping jaw, and integrated anti-shift cleat. The screw-clamp configuration is designed to reach into deep or recessed toggle cavities and maintain controlled contact 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 designed around the height and thickness of the breaker handle rather than its overall width. The open-sided construction accommodates compatible handles up to 9/16" high and 3/8" thick with no specified width restriction, giving maintenance teams an option for qualifying medium and large breakers and MCCBs with wider or more complex handle geometry.

Part number: TSMBRKR5. Similar industry part numbers: 873367, S2393, SFP110, 7110

Product specifications include:

• Quantity: 5 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"
• 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 checked before ordering because handle shape, cavity depth, toggle travel, and surrounding panel clearance can vary between breaker models. This design is particularly relevant for compatible curved handles, recessed toggles, and wider breaker handles that are difficult to secure with conventional flat-jaw lockout devices.

Lockout Devices for Circuit Breakers with Screw-Clamp Design

These lockout devices for circuit breakers use a hand-tightened screw-clamp mechanism to establish a controlled grip around compatible breaker handles. The pointed brass thumbscrew can reach into deeper toggle cavities, while the gripping jaw and anti-shift cleat work together to help reduce unwanted shifting or pivoting after the device has been correctly positioned.

Installation and retention features include:

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

To install the device, position it on the compatible breaker handle and tighten the brass thumbscrew by hand until the lockout is firmly seated. The upper section can then be pivoted 90 degrees before the required padlock or hasp is inserted through the shackle opening, restricting access to the clamping screw while the breaker remains under lockout.

Circuit Breaker Lockout for Industrial Electrical Maintenance

This circuit breaker lockout is suited to electricians, maintenance technicians, industrial facilities, commercial buildings, and service teams working with compatible medium and large breakers or MCCBs. The combination of an open-sided body, defined height and thickness limits, and a pointed screw-clamp mechanism makes it particularly useful for breaker handles with curved surfaces, recessed cavities, or wider profiles.

The 5-pack is a practical option for maintenance kits, smaller electrical teams, or facilities that need several identical devices without stocking a larger bulk package. Before each use, verify the breaker-handle dimensions, geometry, available clearance, and the required isolation position specified by the facility’s established procedure.

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 5-pack when compatible medium or large breaker handles require a purpose-built screw-clamp lockout with no stated handle-width restriction. Verify the 9/16" height and 3/8" thickness limits before installation, then keep the devices available with the rest of your electrical lockout equipment for recurring maintenance 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.