© 2019 ASCO Power Technologies. All Rights Reserved
For troubleshooting, call technical assistance at 1-800-237-4567 or customercare@ascopower.com
3
IO-75065
12/2019
ASCO Model 277
Surge Protective Device (SPD) with Active Tracking Filter™
Introduction ASCO Model 277 with Active Tracking Filter technology offers high
frequency noise lter capabilities with surge protection for loads up to 20 A
of continuous current. The Model 277 is a DIN or ange mounted SPD/ATF
that helps to protect industrial critical loads.
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462.
• This equipment must only be installed and serviced by qualied electri-
cal personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to conrm power is off.
• Replace all devices, doors and covers before turning on power to this
equipment.
• This equipment must be effectively grounded per all applicable codes.
Use an equipment-grounding conductor to connect this equipment to the
power system ground.
• Do not supply more than 125VAC or 5 A AC to contacts.
• Conrm that the Surge Protective Device voltage rating on the module
or nameplate label is not less than the operating voltage.
Failure to follow these instructions will result in death or serious injury.
WARNING: This product can expose you to chemicals including
DINP, which is known to the State of California to cause cancer, and
DIDP which is known to the State of California to cause birth defects
or other reproductive harm. For more information go to: www.
P65Warnings.ca.gov.
NOTICE
LOSS OF SURGE SUPPRESSION
• Make certain that Surge Protective Device is disconnected from the
circuit it is protecting before conducting high potential insulation testing.
Failure to follow these instructions can result in equipment damage.
DANGER
Installation 1. Turn off all power supplying this equipment before working on or inside
equipment.
2. Conrm that the unit has the same voltage rating and conguration as
the power system voltage and power system voltage to which it will be
connected.
3. Install the unit and cables as close as possible to the protected equip-
ment and secure.
4. Connect the supply cables to the line side of the SPD/ATF.
5. Complete the circuit by connecting cables from the load of the SPD/ATF
to the protected equipment.
Note: A dry contact connection is available.
6. Check that all connections are secure. Remove all tools and discarded
hardware from the unit.
7. Replace the barrier, cover/door and/or trim to the equipment.
8. Equipment may be re-energized after all the above steps are complete.
