
© 2020 ASCO Power Technologies. All Rights Reserved
5
IO-70071
01/2020
For access to self-service tools and chat support visit se.com/us/en/work/support or call 1-888-778-2733 for technical assistance
ASCO Model 950 Surge Protective Device (SPD) and Fuse Box
Precautions
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Do not energize the surge protective device until the electrical system is
completely installed, inspected and tested.
• Ensure all conductors are connected and functional.
• Verify the voltage rating of the device and system prior to energizing.
• Perform high-potential insulation testing, or any other tests where surge
protective device components will be subjected to voltages higher than
their rated turn-on voltage, with the neutral and surge protective device
disconnected from the power source
Failure to follow these instructions will result in death or serious injury.
DANGER
At end-of-life conditions, Surge Protective Devices (SPDs) can lose their
ability to block power system voltage and attempt to draw excessive current
from the line. This SPD is equipped with overcurrent and overtemperature
components that will automatically disconnect the surge suppression ele-
ments from the mains should the surge suppression elements reach end of
life. Tripping of the branch circuit breaker or fuse feeding the SPD can occur
when the surge suppression elements reach end of life.