The ELFD Controller Carrier provides a mounting platform for up to two SafetyNet Controllers (8851-LC-MT) .

It can also accommodate a Power Supply Monitor module (8410-NS-PS)

which can monitor the health of up to two 8913-PS-AC,

four 8914-PS-AC power supplies and the 12V supply to Intrinsically Safe Modules (when these are used) .

For each Controller there is a serial port connector and a manually operated ““Change State” button .

The Carrier also provides terminals that are used when earth leakage fault detection is required.