Breaker Locks

Keep maintenance personnel safe and prevent workplace accidents with the right lockout tagout circuit breaker locks. TRADESAFE has a premium-quality line of locks available for both miniature circuit breakers (MCBs) and standard circuit breakers.

Quickly and efficiently secure breaker switches - no need to worry about costly or dangerous operational or human errors. Because these locks are made of industrial-grade, non-conductive, and corrosion-resistant materials, they are guaranteed to be OSHA-compliant. They are also easy to install and won’t require the use of screwdrivers or any other kinds of tools.

Clamp-on circuit breaker locks can easily secure single-pole breaker toggles that are ⅝” to 2-¾” wide and ½” to 1” thick. Meanwhile, miniature circuit breakers (MCBs) come in variations, which include Pin-Out Wide, Pin-In Standard, Pin-Out Standard, and Tie Bar Lockout.

Breaker Locks FAQ

Electrical safety risks can include underground electrical wires, elevated electrical wires, electrical shocks or arc flashes from damaged wiring, and more. In industrial workplaces, it’s important to make sure that employees can reduce or even eliminate risks by executing proper lockout tagout procedures.

Lockout tagout procedures are designed to block hazardous energy from the source or, at the very least, physically prevent machines from accessing hazardous energy. Circuit breaker locks are made to cut off power at the source. Thus, if an employee happens to come by and plugs in a machine that’s under repair or maintenance, the machine will not re-energize. Any repair or maintenance personnel working on the machine will therefore be safe from harm.
Employees should use personal protective equipment as well as the proper lockout tagout devices to prevent electrical hazards and keep themselves safe from injury. Aside from PPE like the proper gloves, boots, suits, and more, employees should also use circuit breaker locks, plug locks, and other devices.

Plug locks can prevent specific machines from being plugged into an electric power source. However, electricity can still flow to other machines in the same area. A circuit breaker lockout, however, can shut off electricity in entire areas, thus ensuring that no electronic machines in those areas will be able to run.
A lockout tagout circuit breaker lock is a device that is used to prevent specific electrical circuits from being turned on or off when a machine is under repair or maintenance. The lock has to be installed on a circuit breaker, then locked and tagged appropriately.

Circuit breaker locks are designed to lock a circuit breaker switch into the off or on position. The switch will remain in that position for as long as the lock is installed. Once the lock is removed, the circuit breaker can then be engaged and turned on or off.

These locks are an essential part of lockout tagout procedures because they help effectively isolate sources of hazardous electrical energy. They also come in different sizes to accommodate circuit breakers of differing voltages.
In lockout tagout, the main purpose of locking out an electrical circuit is to prevent electricity from powering certain machinery or equipment. Typically, this is because a particular machine has to be repaired or serviced. Stopping the flow of electricity to the machine keeps it from turning on and potentially harming the repair or maintenance personnel working on it.

Once any repair or maintenance work is done, employees have to follow a set of procedures to remove the locks they installed. This includes removing electrical circuit breaker locks, which can only be removed by the authorized employees who installed them.
When a part of your body comes into contact with a source of electricity, an electrical shock can occur. Electrical currents can also travel through the air, which can then come into contact with your or other exposed body parts.

Not all electrical shocks are equal, and the severity can vary depending on the voltage of the electrical current. Electrical shocks caused by high-voltage electrical currents can cause severe injuries, even death. Thus, proper electrical lockout tagout using the right devices, such as circuit breaker locks, is important in making sure that employees are safe from electrical shocks.
You can lock a circuit breaker by using the right circuit breaker lock. Circuit breaker locks are typically easy to use and easy to secure. Clamp-on locks in particular can easily be clamped over a circuit breaker switch, then secured with a lockout tagout safety padlock.

It’s also important to make sure that these circuit breaker locks are correctly tagged. This way, other employees can be informed of why the circuit breaker is locked out, who installed the lock, when it was installed, and more.

Circuit breakers are the essential devices necessary to prevent any electrical fire in the workplace. They shut off power when an issue is detected on a circuit.

  1. Durable –  must be able to withstand exposure to weather conditions or wet and damp environments in the industrial workplace.
  2. Standardized– locks must be standardized according to color, shape, or size.
  3. Substantial – the lock must not simply be subverted or removed while in use to prevent access by non-authorized personnel.
  4. Identifiable– must be able to identify the employee who applied them. 
Exclusive for Safety – must be used for safety alone and not interfere with the normal intended operation of the circuit breaker or switch.

Depending on the size of the circuit breaker lockout device needed, there are different mechanisms used for the convenience of the authorized personnel. Clamp-on, push-button, and thumbscrew mechanisms are very easy to use.


Circuit Breaker Clamp-On Lock – the versatile type that can easily secure single-pole breaker toggles that are ⅝” to 2-¾” wide and ½” to 1” thick. Available for 120/277 Volt, 480/600 Volt, and 480/600 Volt (Oversized).


Miniature Circuit Breaker Lock – designed for single- and multi-pole circuit breakers. Available in Pin-Out Wide, Pin-In Standard, Pin-Out Standard, and Tie Bar.


Circuit Breaker Lockout Block Components –locks large and irregularly shaped circuit breaker switches and works best with most 480/600V circuit breakers.

Miniature Circuit Breakers (MCBs) are safety locks that prevent short circuits and overcurrents in electrical circuits. Several different MCB types are available – types A, B, C, D, K, and Z –  all of which are designed to respond to the expected power of electrical surges in different settings.

Below are the most commonly used Miniature Circuit Breaker (MCB) lockout devices:


Pin-Out Wide – designed for single- and multi-pole circuit breakers; accommodates up to ⅘” hole spacing.

Pin-In Standard – designed for single- and multi-pole circuit breakers; accommodates up to ½” hole spacing.

Pin-Out Standard – designed for single- and multi-pole circuit breakers; accommodates up to ½" hole spacing.

Tie Bar – designed for single- and multi-pole circuit breakers; best use for circuit breakers with tie bars.
Yes. Our circuit breaker locks work with most circuit breaker types. A certain breaker model may require a specific circuit breaker lockout. We recommend that you go through all of our circuit breaker lockout options here to determine which one works best for you.

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