Overcurrent circuit breaker Icu=50kA 1P C 16A HMX116

High short-circuit capacity in a compact housing

This single-pole circuit breaker stands out from standard solutions in distribution boards thanks to its very high rated short-circuit breaking capacity (Icu) of 50 kA. This parameter means the device can safely disconnect the circuit even under very high short-circuit currents, which is crucial in installations powered directly from transformers or in locations with high short-circuit power. Thanks to the C tripping characteristic, the device is ideally suited for circuits with short-term current surges, such as the starting of electric motors or the supply of lighting with fluorescent lamps and LEDs.

It is worth noting the terminal construction, which allows for the connection of conductors with a cross-section up to 70 mm² (for rigid conductors) and up to 50 mm² (for flexible conductors). This wide range facilitates installation in both small domestic distribution boards and larger industrial cabinets where thicker cables are often used. The device occupies only 1.5 modules of width on a DIN rail, allowing for space savings in the fuse box without compromising high performance.

Application and mounting flexibility

The device is designed for flush mounting and DIN rail installation, making it a universal component of electrical installations. Thanks to the IP20 degree of protection and energy limitation class 3, it ensures safety against electric shock and minimizes the effects of overvoltages. Mechanical durability of 20 000 cycles and electrical durability of 4 000 cycles guarantee a long service life even with frequent switching or network failures.

For installers, the possibility of system expansion is significant – the circuit breaker allows for the connection of additional accessories, such as auxiliary contacts or releases. Aligned upper and lower terminals facilitate quick series connection with other modular devices, speeding up work when creating a distribution board. The device operates correctly in a wide ambient temperature range: from -25 °C to 70 °C, allowing its use in unheated utility rooms or production halls.

Technical details and operating conditions

The basic technical data for this model are a rated current of 16 A with a C tripping characteristic, defining its main application in circuits with moderate starting currents. The rated insulation voltage is 500 V, and surge withstand capability reaches 6 kV, ensuring solid protection against atmospheric or switching overvoltages. The device handles a network voltage up to 415 V and operates in a frequency range of 50–60 Hz.

Regarding installation and operation, several important aspects should be highlighted: the cross-section of connected conductors ranges from 1 to 70 mm² for rigid conductors and from 1 to 50 mm² for flexible conductors, eliminating the need for additional end fittings for thin cables or reducing their number for thick conductors. The tightening torque of the terminals is in the range of 3.5 to 5.0 Nm, ensuring a durable connection resistant to vibrations. Total power losses at rated current are approximately 3.46 W, resulting in less heating of the device during continuous operation. The open state is visually signaled by a green indicator above the operating lever – simply check the indicator position to know if the circuit is disconnected during maintenance work. The device width is only 27 mm (1.5 modules), and the installation depth is 70 mm, allowing for compact arrangement of components in flush-mounted or surface-mounted distribution boards.