B&K Precision 1900-1901-1902 - Manual - Manual (Page 9)

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3.2 Rear Panel
Figure 2 - Rear Panel
(7) Main Output Terminal (max 60 A for 1900 / 30 A for 1901 / 15 A for 1902)
Note: Please see 4.1.4 Using Both Main and Auxiliary Outputs for
more details on using both main and auxiliary output terminals
together.
(8) Remote Sensing Terminal (model 1900 only)
(9) Mode Selection Switch (Normal, Preset, Remote Control, Set Modes)
(10) Recall Preset Selection Switch
(11) Analog Remote Control Terminal
(12) Cooling Fan Air Intake Grille
(13) AC Input Plug and Fuse Compartment