3RT1916-2EC21

The 3RT1916-2EC21 is a surge suppressor module from Siemens' SIRIUS 3RT1/3RH1 series, engineered to protect sensitive electronic control devices, PLCs, and solid-state outputs from destructive voltage spikes caused by contactor coil de-energization. Designed for direct mounting onto Size S00 contactors and control relays, this protective accessory suppresses inductive voltage transients across control circuits operating at . Electrically, the 3RT1916-2EC21 utilizes a varistor (MOV) network matched to control circuit requirements operating with a control supply. By clamping overvoltage transient spikes generated when the contactor coil drops out, it prevents electromagnetic interference on nearby control lines and protects sensitive semiconductor outputs from voltage breakdown, maintaining stable operation in automated control systems. Mechanically, the 3RT1916-2EC21 is housed in a compact, flame-retardant module featuring Spring-Type (cage clamp) terminals for fast, toolless, and vibration-resistant conductor connections. It clips securely onto designated mounting slots on Size S00 contactors, fitting flush within the contactor envelope to maximize panel space without interfering with power wiring or auxiliary contact blocks. Purchase the 3RT1916-2EC21 at Electrical.com, your reliable partner for industrial and commercial electrical products. Our selection includes trusted surge suppressors, contactor accessories, and motor controls from top manufacturers like Siemens, Eaton, Cutler-Hammer, and Schneider Electric, backed by a knowledgeable sales team ready to assist with technical questions, product selection, and support.