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ASCO Model 138 (Edco RJA-RJD Series) Surge Protective Device

Low Voltage DC | 0.200 kA

The ASCO Model 138 incorporates female jacks in and out. The ANALOGUE Model 138 voltage clamp is set for CO trunks and analogue telephone extensions (with ring in voltage), and the DIGITAL Model 138 voltage clamp is set for digital extensions (no ring in voltage).

ASCO Model 138 (Edco RJA-RJD Series) Surge Protective Device
  • Features

    • <1 nanosecond response time
    • Solid-state resettable fuses – PTCs
    • Silicon breakover technology
    • Low capacitance
    • Line-to-line protection
    • Accommodates RJ-11 jack
    • Tip and ring to ground protection
    • CAN/CSA C22.2, no. 226-92 compliant
    • UL 497A listed
    • Four-pair protection


    • Protects line-to-line, as well as tip and ring to ground.
    • Responds quickly to transients.
    • Exhibits low capacitance to support high-speed data rates
    • 5-year warranty


    • Education
    • Fire/Alarm/Security
    • Healthcare
    • Manufacturing
    • Telecom
    • Transportation
    • Water Supply/Sewage Disposal

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