S&C Electric Company
Type XL Regulator Bypass Switches

The Type XL Regulator Bypass Switch is a station-type device featuring an S&C interrupter for breaking the magnetizing current of the regulator. Current interruption takes place within the interrupter, without external arc or flame.

The disconnect, interrupter, and bypass blades are all of double-member hard-drawn copper construction. Silver-to-silver contacts are utilized throughout the switch. Silver-alloy buttons are brazed into the bypass blade; disconnect and interrupter blades are clad with extra-thick high-density low-porosity silver. Stationary contacts employ brazed silver-nickel overlays or are heavily clad with silver by S&C's Silver-Weld process. Surface structure of the stationary contacts differs from that of the blade contacts-preventing sticking, galling, or seizing. Contacts won’t weld, burn, or pit onovercurrents.

Stainless-steel loading springs behind the contact areas of the blades, including the hinged end, provide a smooth, positive wiping action and keep the contacts under constant pressure. This feature is particularly important in the case of the bypass blade, which is normally in the open position and must carry full load current after long periods of exposure of contact surfaces to atmospheric conditions.

Special attention has been given to the operation and alignment of the disconnect blade through the use of stainless-steel hardware and rigid anchoring of the disconnect blade to the interrupter blade. Ease of operation is assured by floating contact alignment and a carefully positioned and proportioned hook ring.

Type XL Regulator Bypass Switches are offered with a choice of Cypoxy® or porcelain station post insulators. Cypoxy station post insulators are nontracking, self-scouring, nonweathering, and meet or exceed the electrical and mechanical-strength requirements established in ANSI Standard C29.9 (1983) for porcelain standard-strength station post insulators.