8537 series safety switches have a rotary handle to disconnect frequency-controlled motors from the mains without an electrician. Rated operational currents are 12/16 A, 25 A, 40 A or 63/80 A. The units have switching contacts with individual flameproof encapsulation, are available as 3-pole and 6-pole models, and are qualified for international use through ATEX/IECEx certifications and further explosion-protection classifications for various regions.