Delta Surge Arrestor
Helps prevent Lightning & Surge Damage
Replaces: Surge Suppressors, Surge Protectors, and other Surge Protective Devices



 MO 603 

Type of design Metal Oxide Varistor

Case Dimensions:
 4-1/2" High
 2-1/4" Diameter

NEMA 4 Weatherproof Enclosure
1/2" Locknut & 1/2" x 1" reducing washer
1/2" Standard Pipe Thread Nipple
Case Material: PVC
Type of Design SPD Metal Oxide Varistor
Firing Voltage
Sparkover Voltage
VPR Voltage
L-L 2000V
L-N 1000V
Maximum Current L-N 20,000 AMPS
Maximum Joules L-N 800 Joules
Tested to NEMA C62.11
Category B & C and Type 1 & 2
Leads 36" #12 THHN
Response Time 5 nanoseconds
SCCR 10k Amps
Locknut and Washer furnished 1/2" Nipple Washer & Locknut



Fasten arrestor in place. Use a Delta mounting bracket, part # MB, a pipe strap, or a knockout hole. Connect the black wires to the hot lines at any convenience point load-side of an existing fuse or circuit breaker. Connect the white wire to an existing ground system, the grounded metal frame work of the equipment to be protected, or make a ground source per NEC Article 250.

For DC Installation connect red wire to positive, black wire to negative and green wire to ground. Electrical work is hazardous. Bad connections can result in fire, injury or death. Installation must only be done by qualified electricians.

In the event that a lightning discharge is so powerful that something has to be destroyed, the arrestor will take the damage. When sufficient heat and stress causes failure, a one inch hole will open at the bottom of the enclosure. Hot silica and plastic bits will be expelled. Installing the arrestor in any approved electrical box will prevent accidental contact with a damaged unit.


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