The Allen-Bradley 1336-RFB-150-D filter is a passive electronic Input RFI filter accessory module for the Allen-Bradley 1336 PLUS, PLUS II, FORCE, and IMPACT variable frequency drives that is recommended for applications where considerably high levels of Radio Frequency Interference (RFI) are expected to affect the correct performance of the electrical circuits. The 1336-RFB-150-D filter is to be installed as an accessory to protect the installation and is electrically connected between the AC supply line and the variable frequency drive input terminals to suppress conducted EMI/RFI emissions into the main supply lines and ground wiring, but it is not intended to protect devices against radiated emissions in free space. If the electromagnetic noise or interference affecting an application is generated at radiated frequencies (generally higher than 30 MHz), it means that the users need additional shielding and input/output isolation on their devices.

Typical applications where EMI/RFI filters such as the Allen-Bradley 1336-RFB-150-D filter are used include energy management systems, factory automation equipment, motion control for industrial conveyors, heavy industrial machinery such as palletizers, and mills applications. Some installation procedures for guaranteeing effective RFI protection for the circuits are to mount both the filter and the VFD to a common backplane with a positive electrical bond, use specially armored wiring inside the conduits for all the electrical connections of the filter (with a power supply to the input and output to the AC drive), secure shielding or armor connections to the metal bottom plate, and to connect the ground conductor and the shield to the motor case ground at the motor end.