<p>The process of operation of modern vehicles, especially in the aviation and rocketry, is associated with significant static and dynamic loads. In the course of long-term operation, shock and vibration loads prove to be most dangerous, especially in the low-frequency case. This is explained by the absence of unified vibroprotective devices for this frequency band and the necessity of solving complicated engineering problems in each special case. As one of the interesting directions of vibroprotection, especially in the most difficult low-frequency range, we can mention vibroprotective systems with quasi-zero stiffness (QZS). Their characteristic feature is the possibility of elimination of the contradiction between the load-bearing capacity and the natural frequency of the vibroprotective system, which may (theoretically) approach zero. The nonlinearity of the characteristics of vibroprotective systems with QZS also guarantees the possibility of impact protection within a broad frequency range including low frequencies. The aim of the work is the comparative analysis of strength and stiffness characteristics of vibroprotective systems with QZS of two structural types.</p>