APC PMP3XS-B 사용자 설명서

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 elements 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. Mitigate the tripping 
of the branch circuit breaker or fuse feeding the SPD by coordinating the surge 
suppression elements with the branch circuits.

For the purposes of coordination, the SPD is equipped with overcurrent 
components that will limit the per phase I

2

t, I

apparent

, I

p

, and I

th

 values to those 

listed in table 1 when connected to a power system with a short-circuit current 
rating not exceeding 200,000 A.

• Apply appropriate personal protective equipment (PPE) and follow safe 

electrical work practices. See NFPA 70E.

• This equipment must only be installed and serviced by qualified 

electrical personnel.

• Turn off all power supplying this equipment before working on or inside 

equipment.

• Always use a properly rated voltage sensing device to confirm 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.

• Ensure that the branch circuit breaker or fuse trip characteristic has 

been coordinated with the overcurrent components inside the SPD 
(See Table 1).

• Perform periodic inspection of the SPD status indicator lights as part of 

the preventative maintenance schedule. 

• Promptly service the SPD when an alarm state exists.

• Use dry contacts to signal an alarm state to the central supervisory 

system for unmanned, inaccessible, or critical installations.

• Use multiple SPDs to achieve redundancy for critical applications.