Siemens 3RT2936-1ER00 Surge Protection Device

Siemens 3RT2936-1ER00 Surge Suppressor is a diode-based surge protection device designed for 24 V DC coil circuits used with Siemens contactors 3RT2.3 and 3RT2.4, delivering targeted transient suppression for low-voltage automation applications in control cabinets, machine panels, and similar deployments. The diode combination clamps coil-generated voltage spikes when the coil is de-energized, limiting back-EMF and protecting downstream electronics, PLC inputs, and contacts from transient overvoltage. With clip-on mounting, the 3RT2936-1ER00 can be installed quickly on the contactor frame without rewiring, and it serves as a dedicated accessory within the 3RT2.3/3RT2.4 family, helping to keep maintenance simple and replacement fast. Specified for 24 V DC operation, this surge suppressor is documented by Siemens as compatible with the 3RT2.3/3RT2.4 coil configuration, and it appears in major distributors under the same model number, ensuring consistent part numbers across catalogs.