Best Breaker Lock Devices: Comprehensive Review and Tips

installing best breaker lock

Picture the scene: a maintenance team is preparing to service a high-powered industrial electrical panel, the heart of the factory's operations. It's a scenario fraught with risk, where one misstep or inadvertent power surge could lead to a catastrophe. In these critical moments, breaker lock devices are crucial safety tools.

This guide will not only illuminate the vital role these devices play in such high-stakes settings but will also provide you with the knowledge to select the best breaker lockout for ensuring that every maintenance check concludes with a safe and successful restoration of power.


What is a Circuit Breaker Lock?

A circuit breaker lock is an integral safety device that locks out circuit breakers, rendering them inoperable until they are intentionally reactivated. This device serves to prevent accidental re-energization of electrical circuits, protecting workers from the dangers of unexpected startups during critical tasks.


What is a Circuit Breaker?

A circuit breaker is an automated electrical switch designed to protect an electrical circuit from damage caused by excess current, typically resulting from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.

What are the different types of Circuit breakers?

Understanding the different types of circuit breakers is crucial in selecting the appropriate lockout device. Each type has its unique lockout requirements and device compatibility:

  1. Single-pole breakers: These are the most common type in residential applications, handling currents up to 120 volts. A single-pole breaker lockout device, typically a clamp-on or snap-on type, can be used to lock these breakers in the off position.
  2. Double-pole breakers: Used for large appliances and HVAC systems, they handle up to 240 volts. Double-pole breaker locks often come in a bar or clamp-style design to accommodate the breaker’s larger or tandem switches.
  3. GFCI (Ground Fault Circuit Interrupter) breakers: To prevent shock, these breakers cut off the circuit when a ground fault is detected. GFCI breaker locks are usually tailored to fit the unique size and shape of GFCI switches, often requiring a no-hole lockout device.
  4. AFCI (Arc Fault Circuit Interrupter) breakers: These breakers prevent fires by detecting dangerous arcs. They are locked out using specific AFCI lockout devices that allow for the unique button present on the breaker for test functions.


OSHA Requirements for Breaker Locks

When it comes to lockout tagout devices such as breaker lockout devices, OSHA has set forth specific criteria to ensure they are effective and reliable in preventing accidental energization:

  • Durable: Breaker locks must be robust enough to withstand the wear and tear of regular use. This means they should be made from materials that are resistant to corrosion, impact, and deterioration from environmental factors like extreme temperatures, chemicals, or UV light.
  • Standardized: To avoid confusion and ensure uniformity, these circuit breaker lockout devices should be consistent in color, shape, or size across a facility. Standardization helps in quick recognition and understanding, especially in emergencies.
  • Substantial: The lockouts must be sufficiently sturdy to prevent removal without the use of excessive force or special tools. Their design should be such that accidental or unauthorized removal is virtually impossible under normal conditions.
  • Identifiable: Each breaker lockout device should clearly indicate the identity of the worker who applied it, usually through tags or labels. This is crucial for accountability and ensures that lockout devices are only removed by authorized individuals.
  • Exclusive for Safety: The primary function of these devices should be for safety lockout. They should not be used for other purposes that could compromise their integrity or lead to confusion about their purpose.

These rules ensure that breaker lock devices are used effectively and safely across various industries.


Best Brands of Circuit Breaker Lock


TRADESAFE has established a commendable reputation in the realm of industrial safety, earning its place on this list through a steadfast commitment to quality and reliability. Their breaker locks are notable for their robust construction and top-class polypropylene and nylon materials, making them the preferred lockout tagout choice in diverse industrial settings.

TRADESAFE circuit breaker lockout collection offers a variety of types to meet the needs of any industry, including construction, manufacturing, mining, and oil and gas. The Clamp-On Circuit Breaker Locks come in different sizes to accommodate single-pole 120/277V and single/multi-pole 480/600V circuit breakers, including those 480/600V breakers with larger toggles. These breaker locks boast a rugged, impact-resistant build, with a quick thumb-turn installation, ensuring both durability and ease of use.

Additionally, TRADESAFE also offers a highly versatile breaker lock: the Universal Circuit Breaker Lockout. This device is crafted with the same premium quality materials as the clamp-on breaker lockout devices but it stands out for its capability of securing single, double, and even triple pole breakers.

The hallmark of TRADESAFE’s breaker lock collection is its ability to provide unwavering safety assurance in high-risk industrial applications while also keeping the facility compliant with OSHA standards.

Key Features:

  • Robust construction using top-grade materials, ensuring superior durability in various industrial environments.
  • Versatile range of types catering to industries like construction, manufacturing, mining, and oil and gas.
  • Quick thumb-turn installation for convenient application, enhancing operational efficiency.
  • Exceeds OSHA standards, providing reliable safety assurance in high-risk applications.


2. Master Lock

Master Lock is another well-known brand of safety products, including lockout tagout devices. Included in this list for their reliable and sturdy breaker locks, Master Lock products are designed with both quality and functionality in mind. The brand emphasizes creating lock out devices that are easy to use, making them ideal for a wide range of industrial applications.

Master Lock Grip Tight™ Circuit Breaker Lockout collection includes options for different types of circuit breakers, including 120 and 240V breakers and other hi-voltage/hi-amperage breakers. Their user-friendly design, secure hold, and overall performance make them a valuable addition to any electrician's toolkit.

Key Features:

  • Durable and reliable construction for industrial applications.
  • Wide range for different circuit breakers.
  • User-friendly design ensuring ease of use.



BRADY is also a popular brand in the safety equipment industry, known for its comprehensive approach to workplace safety. Their inclusion in this list is attributed to the high standards of quality and functionality seen in their circuit breaker lock devices. BRADY breaker locks are suitable for many industrial settings.

Their products are designed with a focus on visibility and ease of use, but some models may be more complex to install, such as the Clamp-On Breaker Lockout with Cable. BRADY breaker lock collection is designed to assist in lockout/tagout procedures of 120/277V breakers as well as breakers that do not have a hole in the switch tongue.

Key Features:

  • High-quality and functional, suitable for many industrial settings.
  • Designed for enhanced visibility and ease of use.
  • Suitable for breakers without a hole in the switch tongue.


How to Choose the Best Circuit Breaker Lock?

Selecting the right breaker lockout device requires careful consideration of several key factors:

  1. Compatibility: Ensure that the lockout device fits the specific type and size of the breaker lock it is intended for. Misfitting devices can lead to inadequate lockout and potential safety risks.
  2. Durability: Choose materials and designs that can endure the specific conditions of your workplace, including exposure to chemicals, moisture, and mechanical stress.
  3. Ease of Use: A good breaker lockout device should be straightforward to apply and remove, without requiring excessive time or effort. This not only improves efficiency but also ensures that workers are more likely to adhere to safety protocols.
  4. Visibility: Opt for circuit breaker lockout devices with high visibility (such as bright colors) to ensure they are easily noticeable. This reduces the risk of accidental energization by clearly signaling that maintenance is in progress.
  5. Compliance: Check that the device complies with or exceeds the relevant OSHA standards and guidelines. This compliance is not just about avoiding legal issues but more importantly about ensuring the highest level of safety in the workplace.


Frequently Asked Questions (FAQs)

Q1: Are all breaker lock devices one-size-fits-all?

A1: No, breaker lock devices come in various sizes and designs to fit different types of circuit breakers.

Q2: Can a breaker lock be used on a live circuit?

A2: No, breaker locks are designed to be applied to a de-energized circuit following proper lockout/tagout procedures.

Q3: How often should breaker lock devices be inspected?

A3: Regular inspections should be conducted according to the LOTO program guidelines, typically at least annually.

Q4: Are breaker locks required for all maintenance and repair work?

A4: Breaker locks should be used for any work where there is a risk of electrical energy being inadvertently restored.

Q5: Can breaker lock devices be customized for specific facilities?

A5: Yes, many manufacturers offer custom solutions to meet the specific needs of different facilities.

The material provided in this article is for general information purposes only. It is not intended to replace professional/legal advice or substitute government regulations, industry standards, or other requirements specific to any business/activity. While we made sure to provide accurate and reliable information, we make no representation that the details or sources are up-to-date, complete or remain available. Readers should consult with an industrial safety expert, qualified professional, or attorney for any specific concerns and questions.


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Author: Herbert Post

Born in the Philadelphia area and raised in Houston by a family who was predominately employed in heavy manufacturing. Herb took a liking to factory processes and later safety compliance where he has spent the last 13 years facilitating best practices and teaching updated regulations. He is married with two children and a St Bernard named Jose. Herb is a self-described compliance geek. When he isn’t studying safety reports and regulatory interpretations he enjoys racquetball and watching his favorite football team, the Dallas Cowboys.