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The PROSeries is your best option for protecting incoming AC lines in Intelligent Transportation Systems applications. The unit offers 50kA protection and low voltage protection ratings.

The unit also incorporates the use of warning/failure indicators in addition to optional remote sensing for monitoring by a central computer. If random data base memory loss or any other transient interference is effecting the safe operation of one or more of your intersections, the PROSeries surge protector will quickly and effectively eliminate the problem.

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Maximum Surge Current Rating 50kA per Phase
UL Type Designation Type 1 and 2
UL 1449 I-nominal Rating 20kA
UL 1449 Short Circuit Current Rating 200kA
Repetitive Impulse 10,000 hits per mode
Response Time <1 ns
Humidity Range 0-95% non-condensing
Operating Frequency 0-600 Hz
Operating Temperature -25°C to +85°C
Typical Connection #18", 12 AWG (pre-wired) 30 A Breaker
Optional Remote Monitoring Form C Dry Contact, 240V, 2A

Ordering Information

Hesco/RLS PN Sys. Voltage L-N L-G N-G L-L SCCR MCOV
PRO120-1P-A* 120V Single 1∅ 700 1400 700 -- 200kA 150
PRO120-2S-A* 240/120 Split∅ 700 1400 700 1400 200kA 150
PRO277-2S-A* 480Y/277 or 480/240 1200 2400 1200 2400 200kA 320

If dry relay contacts and audible alarm is required, include the "1" suffix to the part number. Example: PRO120-1P-A1 or PRO120-2S-A1


  • 50kA per Phase
  • UL 1449 Listed
  • Stacked MOV Design
  • Low Voltage Protection Ratings
  • 20kA I-nominal Rating
  • 200kA SCCR
  • Optional Remote Monitoring and Audible Alarm
  • Standard 10 Year Warranty


Wiring Configurations