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I. SPECIFICATIONS
APPLICATION:
Voltage Rating Line-to-Neutral
Power Rating
Varistor Voltage, @ 1 mA dc,
Clamping Voltage at Protector Terminals with
3 kA 8/20 ms
10 kA 8/20 ms
20 kA 8/20 ms
Minimum Life with 10 kA, 8/20 msec, per phase
Maximum Surge Current Rating, per phase
Operating Temperature Range
Maximum Operating Altitude
Power Consumption
Remote Monitoring Circuit Contact Rating
II. INSTALLATION
JOSLYN
The
AC Surge Protector MODEL 1456-85-L is intended for installation on
power systems of 480Y/277 Vac, 4 wires plus ground, 3 phase, grounded wye, 50-60 Hz,
unlimited kVA rating. It is intended to be installed at the service entrance.
Location: Locate the protector on or as close to the service entrance cabinet as possible. It
should be short-nippled directly to the service cabinet and located so that the wires used
to connect to the bus are as short as possible. (The inductance of the wiring, about
1 microhenry per 3 feet, results in every 4 inches adding about 100 volts to the
suppression voltage of the protector on a typical 10 kA lightning surge.) If the wire
length exceeds 1 foot and very sensitive electronic equipment is to be protected, a sub-
panel rated surge suppressor should be connected 30 feet or more downstream.
Mounting: The protector may be mounted in any position using the four 5/16" (7.8 mm)
mounting holes. See Figure 1 for protector dimensions.
Connections: Use the shortest and straightest path possible to connect the protector to the
power system, avoiding sharp bends or loops in the wire. Twist the wires together if
possible. See Figure 2 for connection diagram. The protector should be connected
directly to the bus on the load side of the main service disconnect. If no tap is available
on the bus, it may be connected to a 100 amp circuit breaker.
MAG/MNL145685L(NC)
480Y/277 Vac, 3φ, 4 Wire plus
Ground, Grounded Wye
277 Vac
Unlimited
420-520 V
730 V
820 V
1270 V
4,000 Operations
200 kA 8/20 ms
-40° C to +85° C
4,000 Meters
Less Than 9 Watts
3 A @ 240 Vac
3 A @ 32 Vdc
3
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