6
OVRHLD SERIES
SU R G E P R OT EC T I V E D E V I C E S
Monitoring
On some models the internal condition of this
device and its protective function are monitored by
green LEDs on the face of the unit. When the LEDs
are lit, the suppressor is functioning properly and
providing protection.
Replace the OVRHLD suppressor
if a light is out
At the end of life, the OVRHLD Surge Protective
Device (SPD) will generally fail open circuited and
not trip a dedicated breaker if used. If the breaker is
found tripped, it should be reset: If it retrips, replace
the suppressor. If it resets and the green LEDs
remain lit, the suppressor is sound and use may be
continued.
Model
Protetion Modes
Optimum application/location
OVRHLD-yy-xxx-1
L1–N, N–G (1 LED)
2 or 4-wire branch circuit (local lightning conditions)
OVRHLD-yy-xxx-2
L1–N, L2–N (2 LEDs)
3 or 4-wire service entry*
OVRHLD-yy-xxx-3
L1–G, L2–G (2 LEDs)
3-wire L-L branch circuit w/o neutral connected loads
OVRHLD-yy-xxx-4
L1–G, N–G (1 LED)
2-wire incoming branch circuit, common mode lightning protection
OVRHLD-yy-xxx-5
L1–N, L1–G (2 LEDs)
2-wire branch circuit (no local lightning)
OVRHLD-yy-xxx-6
L1–N (1 LED)
2-wire service entry*
OVRHLD-yy-xxx-7
L1–G (1 LED)
2-wire service entry*
OVRHLD-yy-xxx-8
N–G (0 LEDs)
Branch circuit, common mode lightning protection
OVRHLD-yy-xxx-9
L1–L2 (1 LED)
L-L Branch circuit
Where yy = 20, 25, 30
Where xxx= 120, 127, 230, 277
* Within 20m of service entry, minimal to moderate lightning enviroment
For poorly regulated 120 Vac circuits, and for 127–138 Vac L-N circuits, use LDPyy-127-z
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Operation
