SIEMENS Auxiliary Switch Block 3RH1921-1HA31 by Siemens Save Liquid error (product-badge line 32): -Infinity% $34.00 4 IN STOCK 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart SIEMENS Auxiliary Switch Block 3RH1921-1HA31 4-Pole; Screw Terminal 3NO+1NC