Blown Fuse Indicator & Trip
All bolted EJ-2 type fuses have inherent blown fuse in-
dication because the striker pin at the top of the fuse
protrudes out when the fuse is blown. In the CR194
two-high, the striker pin drives the blown fuse indica-
tor and trip bar which operates the blown fuse trip
(BFT) contact block. The BFT contact block can be
wired to trip the controller off line to prevent single
phasing of the connected load (anti-single phase pro-
tection). It can also be wired to an optional blown fuse
indicator mounted on the low-voltage door. Figure 14
shows the top of the bolted power fuse assembly with
the center blown fuse indicator in the “blown” posi-
tion and the two outside blown fuse indicators in the
“normal” position. Figure 15 shows the BFT contact
block, with wiring removed for clarity.
CR194 Two-High Vacuum Limitamp@ Control
Figure 15. Blown fuse trip (BIT) contact block
with wiring removed for clarity
Figure 14. Blown fuse indicators with center phase indicating
“blown” and outside phases indicating “normal”
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