A switching assembly for transferring trains of pulses, comprising: a first assembly terminal and a second assembly terminal; a first plurality of first relays (110A, 110B) connected in parallel, whereby the first relays have respective first contacts (110A1C1, 110A2C1, 110B1C1, 110B2C1) connected together and have respective second contacts (110A1C2, 110A2C2, 110B1C2, 110B2C2) connected together, and wherein the respective first contacts are connected to the first assembly terminal; a first capacitor connected in parallel with the first plurality of first relays; a second plurality of second relays (130A, 130B) connected in parallel, whereby the second relays have respective third contacts (130A1C1, 130A2C1, 130B1C1, 130B2C1) connected together and have respective fourth contacts (130A1C2, 130A2C2, 130B1C2, 130B2C2) connected together, and wherein the respective fourth contacts are connected to the second assembly terminal; a second capacitor connected in parallel with the second plurality of second relays; and a connection, having a first termination connected to the respective second contacts and a second termination connected to the respective third contacts, so that the first plurality of first relays and the second plurality of second relays are connected in series, wherein the pulses have amplitudes of at least 2 kilovolts, and whereby on activation of the first plurality of first relays and the second plurality of second relays the respective first and second contacts connect and the respective third and the fourth contacts connect, thereby connecting the first and second assembly terminals, and on deactivation of the first plurality of first relays and the second plurality of second relays the respective first and second contacts disconnect and the respective third and the fourth contacts disconnect, thereby disconnecting the first and second assembly terminals, wherein the capacitances of the first and second capacitors are equal and larger, by at least a factor of five, than a capacitance of the contacts of the plurality of relays with which they are connected in parallel, when open. a first assembly terminal and a second assembly terminal; a first plurality of first relays (110A, 110B) connected in parallel, whereby the first relays have respective first contacts (110A1C1, 110A2C1, 110B1C1, 110B2C1) connected together and have respective second contacts (110A1C2, 110A2C2, 110B1C2, 110B2C2) connected together, and wherein the respective first contacts are connected to the first assembly terminal; a first capacitor connected in parallel with the first plurality of first relays; a second plurality of second relays (130A, 130B) connected in parallel, whereby the second relays have respective third contacts (130A1C1, 130A2C1, 130B1C1, 130B2C1) connected together and have respective fourth contacts (130A1C2, 130A2C2, 130B1C2, 130B2C2) connected together, and wherein the respective fourth contacts are connected to the second assembly terminal; a second capacitor connected in parallel with the second plurality of second relays; and a connection, having a first termination connected to the respective second contacts and a second termination connected to the respective third contacts, so that the first plurality of first relays and the second plurality of second relays are connected in series, wherein the pulses have amplitudes of at least 2 kilovolts, and whereby on activation of the first plurality of first relays and the second plurality of second relays the respective first and second contacts connect and the respective third and the fourth contacts connect, thereby connecting the first and second assembly terminals, and on deactivation of the first plurality of first relays and the second plurality of second relays the respective first and second contacts disconnect and the respective third and the fourth contacts disconnect, thereby disconnecting the first and second assembly terminals, wherein the capacitances of the first and second capacitors are equal and larger, by at least a factor of five, than a capacitance of the contacts of the plurality of relays with which they are connected in parallel, when open.