Reliance Electric 600686-33AA Surge Suppressor

The Reliance Electric 600686-33AA Surge Suppressor is an RC snubber network designed to tame coil transients across relay or contactor coils in DC control circuits. It combines a 0.5 µF capacitor in series with a 220 Ω resistor, rated at 600 VDC, with a 1/2 W power rating and a tolerance of ±10%. Cataloged as 600686-33AA (also listed as 600686-33A or 60068633AA in some sources), this part is associated with Reliance Electric’s drive and control line (now part of Baldor Reliance/ABB). The device is intended to be connected across coil terminals to absorb inductive energy when the coil is de-energized, reducing arcing, EMI, and wear on switches. Common applications include relays, contactors, and other inductive loads within industrial control circuits that use Reliance Electric or Baldor components. Note that several catalogs currently indicate the model is discontinued by the manufacturer, which can affect availability and sourcing from distributors. This compact RC network provides a straightforward retrofit for older systems where protecting coil drives from surge events is essential, without requiring changes to the coil or drive circuitry.