United StatesChange

Rail Secondary Power Surge Protector, DC Circuits


  • Hybrid TVSS technology
  • High surge rating provides a high level of protection and long operational life
  • Internal patented thermal disconnect system designed specifically for operation of DC systems to assist safe disconnect at end of life
  • Low let-through voltage
  • Sine wave filter for RFI/EMI attenuation


Part Number EPD1224ATAAR1
Nominal System Voltage (Un) 12 VDC
24 VDC
Max Continuous Operating Voltage (Uc), 12 VDC 18 VDC
Max Continuous Operating Voltage (Uc), 24 VDC 36 VDC
Voltage Protection Level, 12 VDC (Up) 34 V @ 20 kA
Voltage Protection Level, 24 VDC (Up) 41 V @ 20 kA
Rated Load Current (IL) 30 A
60 A
Filtering -65 dB @ 100 kHz
Distribution System Two wire
Aggregate Surge Rating 20 kA 8/20 μs
Status Indication LED
Technology Metal Oxide Varistor (MOV)
Silicon Avalanche Diode (SAD)
In-line series filter
Connection Type AAR Terminals
Protection Modes -ve to +ve
Humidity 0 – 90 % RH
Temperature -40 to 158 °F
Enclosure Material UL® 94V-0 Thermoplastic
Enclosure Rating IP 20
Depth (D) 4.73"
Height (H) 2.37"
Width (W) 4.73"
Unit Weight 1.92 lb
Complies With ANSI®/IEEE® C62.41.2-2002 Cat A, Cat B, Cat C
AREMA® requirements

nVent, nVent CADDY, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without prior notice.

ANSI is a registered trademark of American National Standards Institute.
AREMA is a registered trademark of American Railway Engineering and Maintenance-of-Way Association, Inc.
IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
NEMA is a registered service mark of National Electrical Manufacturers Association.
UL, UR, cUL, cUR, cULus and cURus are registered certification marks of UL LLC.