If your facility runs electrical maintenance, you already know that a electrical LOTO kit is more than a box of padlocks. It is the practical toolkit your technicians use to isolate energy before they open a panel, service a machine, or reset a breaker. The challenge for most EHS managers and procurement buyers is not deciding whether to buy a kit—it is deciding what should go inside and how the device mix should change from one panel type to another.
This guide walks through the contents of an electrical lockout kit by panel type, from circuit breaker panels and plug-connected equipment to control panels and mixed-voltage facilities. You will also find a configuration reference table you can share with your procurement team or safety officer before placing an order.
At minimum, an electrical LOTO kit should contain devices that physically prevent the re-energization of isolated electrical equipment while maintenance is underway. The exact contents depend on where your employees will apply the lockout. A circuit breaker panel needs breaker lockouts that match the breaker profile and trip mechanism. Plug-connected equipment needs plug lockouts that fit the plug body and cord gauge. Control panels with push buttons, selector switches, or emergency stops need button covers and rotary switch lockouts.
Because each isolation point has a different physical shape, voltage exposure, and access pattern, your business gets better protection and faster procedure compliance when the kit is configured by panel type rather than by generic device count. If you are still unsure about the basics, read our earlier overview of what a lockout kit contains before moving on to the panel-specific recommendations below.
Different electrical isolation points expose workers to different energy hazards and physical layouts. A miniature circuit breaker uses a small toggle that a snap-on lockout can hold in the OFF position. A molded-case breaker has a larger handle and may need a clamp-on or grip-tight device. A plug is outside the panel and must be physically surrounded so it cannot be reinserted into a receptacle. A control station may have multiple start buttons, each needing its own cover.
Regulatory frameworks such as OSHA 29 CFR 1910.147 and NFPA 70E both emphasize that energy control procedures must be specific to the equipment and energy source. Using the wrong device for the panel type can lead to a false sense of security, delays at shift handover, or a lock that does not seat properly under vibration. That is why lockout tagout kits designed for electrical work are usually organized by isolation point rather than by a single universal device.
A circuit breaker panel kit is built around devices that secure individual breakers in the OFF position. Start with miniature circuit breaker lockouts for lighting and small-motor circuits, add molded-case circuit breaker lockouts for larger feeders, and consider a multi-functional or large breaker lockout for main breakers. Each device should be paired with a safety padlock per authorized employee and a lockout tag that records the worker’s name, date, and reason for isolation.
When you select breaker lockouts, look closely at the breaker toggle width, frame size, and whether the handle is a single toggle or a multi-pole assembly. For example, a circuit breaker lockout that fits a standard MCB may not fit a large molded-case breaker without an adapter. For a deeper comparison of device shapes, see our guide to circuit breaker lockout devices and the article on circuit breaker lockout types by panel design.
Typical circuit breaker panel kit contents: three to five MCB lockouts, one or two molded-case breaker lockouts, six to ten keyed-different or keyed-alike safety padlocks, an equal number of danger tags, and a permanent marker for filling out the tags. If your crews work in pairs or groups, add lockout hasps so multiple personal locks can secure one breaker point.
This kit targets machines that receive power through a detachable cord and plug. A plug lockout surrounds the plug body or locks the plug to the receptacle so the cord cannot be reconnected. Plug lockouts are common on portable tools, welders, bench grinders, food-processing equipment, and any machine where the disconnect point is the plug rather than a breaker.
Use lockout hasps when multiple technicians need to apply their own padlocks to one isolation point, especially on shared test benches or production lines. Include padlocks with distinct colors or keying schemes to support group lockout and reduce the chance of a worker removing the wrong lock. You can learn more about how hasps support shared isolation points in our article on the role of lockout hasps in workplace security.
Typical plug-connected equipment kit contents: two to four plug lockouts sized for your largest plug bodies, one or two group lockout hasps, six to eight safety padlocks, matching tags, and a small pouch or portable lockout bag so technicians can carry the kit to the machine.
Control panels isolate energy at the operator interface, not the distribution path. You need push button lockouts and emergency-stop button covers that prevent accidental or intentional restart. Rotary switch lockouts handle selector switches, while wall-switch covers protect toggle or rocker switches that control lighting or small motors.
For panels with several start points, a group lockout hasp lets each technician add a personal padlock while a single cover protects the button. Because control panels often operate at lower voltages than feeder panels, the lockout device still needs to be durable enough for industrial temperatures, dust, and occasional chemical exposure.
Typical control panel kit contents: four to six push button or emergency-stop covers, two rotary switch lockouts, one wall-switch cover, a small group lockout hasp, six to eight safety padlocks, and matching tags. If your panels include variable-frequency drives or programmable logic controllers, remember that software interlocks and control circuit lockout must be part of the overall energy control plan, even if they are not handled by physical devices alone.
Facilities with both low-voltage control circuits and high-voltage feeders should combine device types rather than doubling up on one type. Use breaker lockouts for the distribution panel, plug lockouts for cord-connected tools, and button covers for operator stations. Organize devices by voltage class and panel location in a portable lockout bag or wall-mounted station so crews do not have to return to the tool crib between jobs.
When you mix voltages, pay attention to the materials used in the devices. Nylon and glass-filled polymers are common for general electrical lockouts, while some high-voltage applications may call for devices that are clearly marked and rated for the expected exposure.
Before configuring the kit, walk the floor and list every electrical isolation point your technicians will lock out. Record panel type, breaker brand and frame size, plug configurations, and control station layouts. Confirm the facility voltage range and whether arc-flash boundaries affect who can apply the lockout. Estimate how many technicians work per crew so you order enough padlocks, tags, and hasps for each authorized employee.
Count the number of each device you will need based on concurrent maintenance tasks, not total breakers. A facility with fifty breakers rarely needs fifty breaker lockouts at the same time. It needs enough to cover the largest planned maintenance window. Also confirm whether your site prefers keyed-alike padlocks for a single department, keyed-different padlocks for individual accountability, or master-keyed systems that let supervisors open locks in an emergency without removing every technician’s lock.
| Panel Type | Primary Device | Supporting Devices | Typical Quantity Notes |
|---|---|---|---|
| Circuit breaker panel (MCB) | Miniature circuit breaker lockout | Safety padlocks, danger tags | 1 padlock + tag per authorized worker per breaker |
| Circuit breaker panel (MCCB) | Molded-case / clamp-on breaker lockout | Safety padlocks, danger tags, marker | Match breaker frame size and handle profile |
| Plug-connected equipment | Plug lockout | Group lockout hasps, padlocks, tags | One per cord; add hasp for group work |
| Control panel / push button | Push button / E-stop cover, rotary switch lockout | Safety padlocks, tags, group hasps | One cover per start point or selector switch |
| Mixed-voltage facility | Combination of devices above | Portable lockout bag or wall station, voltage-rated padlocks | Scale by crew size and concurrent jobs |
An electrical LOTO kit should include the lockout devices that match your isolation points, plus safety padlocks, danger tags, and a way to carry or store the equipment. For breaker panels, that means breaker lockouts. For plug-connected equipment, that means plug lockouts. For control panels, that means button covers and rotary switch lockouts. The exact device count depends on how many technicians work at the same time and how many isolation points are active during a typical maintenance window.
Each panel type has a different physical shape, voltage exposure, and access pattern. A breaker toggle, a plug body, and a push button require different mechanical devices to prevent re-energization. A device that works on a miniature breaker will not fit a plug, and a plug lockout will not secure a control station start button. Configuring by panel type ensures the device can be installed correctly and will stay in place during the job.
A circuit breaker panel kit needs breaker lockouts sized for the breakers in the panel, safety padlocks, and danger tags. MCB panels need snap-on or miniature breaker lockouts. MCCB panels need clamp-on, grip-tight, or large molded-case breaker lockouts. If more than one technician will lock out the same breaker, add a group lockout hasp so each person can attach a personal padlock.
A plug-connected equipment kit needs plug lockouts that fit the plug body, safety padlocks, danger tags, and group lockout hasps for shared equipment. Some kits also include a portable lockout bag so technicians can carry the devices to wherever the machine is located on the shop floor.
Yes. Control panels and push buttons need button covers, emergency-stop covers, and rotary switch lockouts rather than breaker lockouts. These devices protect the operator interface so the equipment cannot be restarted accidentally or intentionally while maintenance is in progress. They are often used together with a group lockout hasp when multiple technicians share the isolation point.
One kit can cover multiple voltage levels if it contains the right mix of device types. The key is to match the lockout device to the isolation point, not to the voltage alone. Low-voltage control panels need button covers and small breaker lockouts, while high-voltage feeders need larger breaker lockouts and possibly devices rated for the expected exposure. Always follow site-specific energy control procedures and applicable electrical safety standards when selecting devices for high-voltage work.
Plan for one padlock and one danger tag per authorized employee. For breaker lockouts, plug lockouts, and button covers, plan based on the maximum number of concurrent isolation points, not the total number of devices in the facility. A common starting point is three to five breaker lockouts, two to four plug lockouts, and four to six button covers per crew, adjusted for your actual maintenance schedule and panel types.
Before configuring a kit, gather the panel types on site, breaker brands and frame sizes, plug configurations, control station layouts, the facility voltage range, the number of technicians per crew, and the number of concurrent maintenance tasks. This information lets you select the right device types and quantities instead of ordering a generic kit that may leave some isolation points uncovered.
| Not sure which electrical LOTO kit fits your panels? Configuring an electrical LOTO kit for your facility? Share your panel types (breaker, plug-connected, control panel) and voltage range with Prolockey, and we can recommend a suitable device configuration. |
About Prolockey — Prolockey is the lockout/tagout brand of Lockey Safety Products Co., Ltd., founded in 2015 in Yueqing, Zhejiang, China. The company operates an 8,000 m² facility, has 100+ employees and serves customers in 140+ countries.
Disclaimer: Prolockey provides lockout tagout devices; employers are responsible for establishing and implementing site-specific energy control procedures.
