Protege contra sobrecargas y cortocircuitos. Su símbolo combina un gancho (térmico) y una cruz o cuadro (magnético).

Asumo que te refieres a una guía, libro o recurso llamado "Simbología eléctrica industrial Best" (o bien buscas una reseña de recursos "best" sobre simbología). Proporciono una reseña práctica y estructurada basada en criterios útiles para profesionales y técnicos.

These symbols are primarily used in various types of technical diagrams, including:

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: Uses "box logic"—rectangular boxes with internal symbols to denote function. It is abstract, logical, and designed for clean, computer-aided layouts.