WATLOW MLS300 is a dedicated safety limit controller designed to protect industrial heating and thermal processing systems from excessive temperature conditions. It operates as an independent safety device, continuously monitoring process values and triggering protective actions when predefined limits are exceeded.
The MLS300 is engineered to support applications where temperature safety is critical to system integrity, process stability, and equipment protection. By providing reliable limit monitoring, it helps reduce the risk of overheating and associated damage to heating elements, machinery, and surrounding infrastructure.
This controller is designed to function separately from the main temperature control loop, ensuring that safety protection remains active even if the primary control system experiences faults or abnormal behavior. The independent safety function enhances overall system reliability in demanding industrial environments.
WATLOW MLS300 supports precise monitoring of temperature inputs and responds quickly when the configured safety threshold is reached. Upon detecting an over-limit condition, the controller initiates a shutdown or interruption of power to the heating system, helping prevent unsafe operating conditions.
The MLS300 is suitable for integration into a wide range of industrial heating applications, including ovens, furnaces, thermal processing equipment, and temperature-sensitive manufacturing systems. Its safety-oriented design supports compliance with industrial standards that require independent over-temperature protection.

Designed for consistent performance, the MLS300 provides stable operation across continuous and intermittent processes. Its control logic ensures predictable and repeatable responses to over-temperature events, supporting safe and controlled system behavior during both normal operation and fault conditions.
The controller features a clear operating concept that allows safety limits to be configured accurately according to process requirements. This flexibility enables it to support various thermal profiles and operating conditions while maintaining a high level of safety assurance.
WATLOW MLS300 is engineered to operate reliably in industrial electrical environments where noise, temperature variation, and continuous operation are common. Its robust design contributes to dependable monitoring performance and long-term stability.
By separating safety monitoring from standard temperature control, the MLS300 helps simplify system design while enhancing overall protection. This separation allows control systems to focus on process optimization while the MLS300 maintains continuous safety supervision.
The compact form factor of the MLS300 allows for efficient installation within control panels and electrical enclosures. Its layout supports straightforward integration alongside controllers, power devices, and automation components commonly used in industrial systems.
In applications where regulatory compliance and process safety are essential, the MLS300 serves as a critical component. It provides an additional layer of protection that helps prevent unsafe temperature conditions and supports stable production operations.
WATLOW MLS300 is designed to support long-term industrial use with consistent safety performance. Its reliable limit detection and protective response capabilities contribute to reduced downtime, enhanced equipment protection, and improved overall system confidence.
As part of WATLOW’s safety control portfolio, the MLS300 Limit Controller offers a dependable solution for industrial applications requiring accurate over-temperature protection. It supports safe operation of heating systems by ensuring that temperature limits are continuously monitored and enforced.



