memory (impulse) switches, controlled by buttons for light switching from more places, are a practical replacement for three-way switches (No.6) and cross-bar switches (No.7)
thanks to control by buttons (unlimited number, connected in parallel by 2 wires), installation gets more transparent and faster for mounting
relay MR-41/UNI, MR-42/UNI remembers its state after re-energization in a way that it is always switched off, after energization it automatically returns into its state before de-energization
MR-41/UNI - output contact: 1x changeover/ SPDT 16 A
MR-42/UNI - options - 2x parallel contacts or the other relay is latching - function selected via external jumper between B1 - B2 - output contact: 2x changeover/ 2PDT 16 A
