Cylindrical fuse insert CH-10 10x38mm aM 16A 500VAC LF316M

Short-circuit protection for motor circuits

The 10x38 mm cylindrical fuse link is a key component in industrial installations where rapid disconnection of short-circuit current is a priority, while maintaining resistance to short-term current surges. The LF316M model, manufactured by Hager, is specifically designed for aM applications (partial motor protection). This means it does not provide protection against long-term overloads—other components are required for that—but focuses on instantaneous response in the event of a short circuit. Consequently, it is ideally suited for circuits supplying electric motors, which generate high inrush currents during startup that a standard fuse might incorrectly interpret as a fault.

Application and operating characteristics

The primary function of this fuse link is to ensure installation safety at a rated voltage of 500 V AC. Its ceramic construction and high breaking capacity of 120 kA enable it to safely interrupt even very powerful short-circuit currents without the risk of explosion or damage to the surroundings. It is important to note the specificity of the aM characteristic: it allows motor starting current to flow without tripping the fuse, thereby eliminating false alarms and machine downtime. In the event of a short circuit, this component reacts immediately, protecting more expensive electrical components from destruction.

For installers, precision of manufacture and low energy losses are also critical. At a rated current of 16 A, the fuse link dissipates only 0.92 W of power. This small value translates into reduced housing heating and energy savings within the system. This fuse is designed for installation in standard cylindrical holders with dimensions 10x38 mm, ensuring compatibility with most industrial distribution boards and control cabinets.

Key features and application areas

The selection of this model is due to its dedication to circuits requiring a specific tripping curve. In practice, this means the fuse link is used primarily for protecting control circuits of electric motors and in industrial installations where it is necessary to distinguish between starting current and short-circuit current. The high breaking capacity of 120 kA makes it a suitable choice where the risk of large short-circuit currents is real.

Thanks to compliance with the IEC 60269 standard and meeting the requirements for category aM, this product guarantees predictable performance in the harsh environmental conditions typical of production halls or mechanical workshops. Parameters such as 500 V AC voltage or the ceramic housing material are fixed and defined by the manufacturer, eliminating the need for additional calibration or selection of accessories—the fuse link operates according to its specifications immediately after installation in the appropriate holder.