Bourns 1250A General Duty AC Surge Protective Devices

Bourns 1250A General Duty AC Surge Protective Devices (SPDs) offer a 150V to 690V operating voltage range and large surge energy capability of up to 50kA per mode. These devices are designed to protect high-risk electrical service entrances and branch panels and are intended to be installed at the front end of the installation in the main switchboard. 1250A series devices can be configured for both common-mode and differential-mode protection in single- and three-phase applications. Bourns 1250A General Duty AC SPDs are suitable for all power circuits, heavy industrial applications, and EV charging stations.


  • High reliability protected MOV with advanced thermal disconnector (TD+)
  • Large surge energy capability up to 50kA per mode
  • Degradation failure indication
  • DIN rail mountable for easy installation
  • Pluggable module for easy replacement


  • Electrical service entrance
  • Branch panels
  • All power circuits
  • Heavy industrial
  • EV charging stations


  • Complies with UL 1449 and IEC/EN 61643-11 standards
  • UL recognized Type 4, Type 2 Location SPD
    • Passed short circuit current rating (SCCR) 200kA without external fuse or circuit breaker
  • 150V to 690V operating voltage range
  • <1mA leakage current rating
  • Thermoplastic UL 94V-0 enclosure material
  • ≤2000m operating altitude
  • IP20 environmental rating
  • -40°C to +85°C operating temperature range
Published: 2023-06-30 | Updated: 2023-07-18