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Smallest Fuse Approved for Use in Space Applications

SMD Fuse for Space Applications is Approved according to ESA/SCC. SCHURTER's new SMD-fuse type MGA-S meets the standard of ESA/SCC Generic Specification No 4008 for space applications.

Based on the design of Schurter's existing MGA, the new version meets the requirements of the space industry and its demands for a fuse product with hermetic seal and robust construction, such that with a disconnection, no arcs or gasses can escape. The requirements also include additional pre-arcing times, consistency of over-current disconnects at rated voltage regardless of vacuum conditions, stable derating curves at higher ambient temperatures, and durability against mechanical vibration and shock.

The technology widely used for standard fuses today is not able to fulfil the requirements for a long-term reliability of 20 to 30 years. This long-term stability is influenced by leakage loss, ageing and ambient temperature in combination with thermal cycles, which are quite prevalent in satellite applications. This is mainly due to the ageing phenomena of the traditional tinned fuse links. The MGA-S with its thin film technology (metal sputter process) increases the long-term stability of the fuse through the homogeneous crystal structure of the metal layers.

Its small dimensions in a popular 1206 footprint [3.2 mm by 1.55 mm] make the MGA-S the smallest SMD fuse qualified for use in equipment for space. Applications include equipment that is launched into orbit with a specific focus on satellite power system architectures operating up to 125 VDC in vacuum environments. This includes protection of power supplies, batteries and solar arrays.

The MGA-S is the only European manufactured SMD fuse for space applications. It is built according to UL 248-14 and CSA 22.2 no. 248-14 and carries UL and CSA recognition. It is also tested according to Mil-Std 202, Method 108A, 103B, 106E, 107D, 211A & 215A.

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