120/240 VAC Three wire
F ound at S ervice entrances and
Meter C ans.
Line
Line
G rounded/
Neutral
120 v
120 v
240 v
WHIT E
B LAC K
B LAC K
120/240 VAC Three wire plus Ground
F ound in Main Disconnect S witches,
Main Distribution panels, Load C enters
S ub panels and equipment locations.
Line
Line
Neutral
G round
120 v
120 v
240 v
120 v
120 v
B LAC K
B LAC K
240 VAC Two wire plus Ground
from a single phase panel
F ound at connections for individual
pieces of equipment such as motors,
water heaters and parking lot lights.
Line
Line
G round
240 v
B LAC K
B LAC K
120 v
WHIT E
WHIT E
WARNING:
Intermatic Incorporated recommends that the UG and IG series Secondary Surge Arresters be
installed by a licensed electrician. Hazardous voltages may be present. These units are not
intended to protect against direct lightning strikes.
MAINTENANCE:
Inspect periodically to be sure that the Red indicator LED is on. If it not, unit is no longer providing
surge protection and should be replaced.
APPLICATION
This model is designed specifically for 120 / 240 VAC single phase or split phase applications. If
your application does not match one of the diagrams shown below, call your supplier or Intermatic.
INTERMATIC INCORPORATED
PLAZA, SPRING GROVE, ILLINOIS 60081-9698
© Copyright
2007 Intermatic Inc.
Model UG240R and IG250LA
Secondary Surge Arresters
INSTALLATION
INSTRUCTIONS
