In the industrial world, safety is paramount, and one of the most effective methods to ensure that workers are protected during maintenance, repairs, or service activities is the implementation of Lockout-Tagout (LoTo) procedures. LoToTo locks—commonly referred to in certain industries as “Lockout-Tagout-Tryout” locks—are a crucial part of this safety protocol. This article aims to explain the importance of LoToTo locks, how they work, and why they are essential for protecting workers from unexpected machine startup or the release of hazardous energy during maintenance work.

What are LoToTo Locks? At their core, LoToTo locks are tools used in industrial safety procedures designed to control hazardous energy sources during maintenance or repair work. These locks are part of a broader Lockout-Tagout (LoTo) system, which ensures that equipment or machinery is properly shut down, locked, and tagged with warning notices to prevent accidental activation or exposure to dangerous energy. The term LoToTo adds a critical layer to the safety procedure by incorporating a Tryout phase. This phase involves verifying that the machine or equipment is indeed in a de-energized state and cannot be inadvertently started while workers are present.