3 HARDWARE 3.1 DESCRIPTION
The relay is available as a 19-inch rack horizontal mount unit or as a reduced size (¾) vertical mount unit, with a removable
faceplate. The modular design allows the relay to be easily upgraded or repaired by a qualified service person. The face-
plate is hinged to allow easy access to the removable modules, and is itself removable to allow mounting on doors with lim-
ited rear depth. There is also a removable dust cover that fits over the faceplate, which must be removed when attempting
to access the keypad or RS232 communications port.
The vertical and horizontal case dimensions are shown below, along with panel cutout details for panel mounting. When
planning the location of your panel cutout, ensure that provision is made for the faceplate to swing open without interfer-
ence to or from adjacent equipment.
The relay must be mounted such that the faceplate sits semi-flush with the panel or switchgear door, allowing the operator
access to the keypad and the RS232 communications port. The relay is secured to the panel with the use of four screws
supplied with the relay.
GE Power Management
Figure 3–1: L90 VERTICAL MOUNTING AND DIMENSIONS
L90 Line Differential Relay
3.1.1 PANEL CUTOUT