20.21 20.22, 24, 26, 28 20.23 1 or 2 Pole 16 A Step relays for direct 35 mm rail (EN 60715) mounting with the following features: 17.4 mm wide, test button with mechanical indicators, 6 switching sequences available, AC coils and DC coils, identification label, possible to connect illuminated push buttons with the additional part 026.00, 35 mm rail (EN 60715) mount, cadmium free contact material