TDX SPD Modular Series of Surge Protection Devices


TDX SPD Modular Series Surge Protection

The TDX Modular Series of Surge Protection Devices are designed for critical protection applications. The 100kA to 400kA 8/20µs (depending on model) of surge protection exceeds the IEEE®C62.41.2 Scenario II single shot surge rating requirements for exposed service entrance locations – Exposure 3.

The NEMA®-4 weather-tight housing allows the TDX to be installed on indoor or outdoor service panels. The preconfigured connecting leads simplify installation. The unique narrow construction allows the SPD to fit between adjacent panel boards and connect via a 90-degree elbow. A flush mounting kit is also available for installing the SPD in drywall applications for the 100 & 200 models.

Listed as a Type 1 SPD to UL®1449 3rd Edition, the TDX Modular Series can be installed within a Type 1 or 2 location in accordance with the NEC®2008.


  • Transient Discriminating (TD) Technology provides increased service life
  • Modular design allows individual modes to be field replaceable, built-in disconnect and fusing eliminates need for external fusing
  • Built-in safety features include TD Technology, thermal protection and short circuit current cartridge fusing
  • Compact NEMA-4 enclosure design can be flush mounted or installed in a small space
  • Status indication flag per mode, voltage presence LED’s, audible alarm and voltage-free contacts providing remote status monitoring
  • 100kA 8/20µs, 200kA 8/20µs, 300kA 8/20µs or 400kA 8/20µs (depending on model) maximum surge rating provides protection suitable for service entrance, main-distribution panels and highly exposed applications
  • Available in various operating voltages to suit most common power distribution systems
  • CE, UL®1449 Edition 3 Listed
  • ERICO Surge Products are covered by an extended warranty; see the attached document for more information
  • USA Approval
  • Canadian Approval


  • Designed for critical protection applications
  • Ideal for retrofit to indoor or outdoor service panels


TDX SPD Modular Series Surge Protection TDX SPD Modular Series Surge Protection TDX SPD Modular Series Surge Protection
TDX Replaceable Modules TDX Replaceable
Cartridge overcurrent
fuse protection
Typical installation

More Information

Part Number
TDX100M120/208 100kA/Phase, 120/208V, 3Ph, 4W+G
TDX100M120/240 100kA/Phase, 120/240V, 1Ph, 3W+G
TDX100M120/240D 100kA/Phase, 120/240V, 3Ph DELTA, 4W+G*
TDX100M240D 100kA/Phase, 240V, 3Ph DELTA, 3W+G*
TDX100M277/480 100kA/Phase, 277/480V, 3Ph, 4W+G
TDX100M277/480TT 100kA/Phase, 277/480V, 3Ph, 4W+G, TT System
TDX100M347/600 100kA/Phase, 347/600V, 3Ph, 4W+G
TDX100M480D 100kA/Phase, 480V, 3Ph DELTA, 3W+G*
TDX200M120/208 200kA/Phase, 120/208V, 3Ph, 4W+G
TDX200M120/240 200kA/Phase, 120/240V, 1Ph, 3W+G
TDX200M120/240D 200kA/Phase, 120/240V, 3Ph DELTA, 4W+G*
TDX200M240D 200kA/Phase, 240V, 3Ph DELTA, 3W+G*
TDX200M277/480 200kA/Phase, 277/480V, 3Ph, 4W+G
TDX200M277/480TT 200kA/Phase, 277/480V, 3Ph, 4W+G, TT System
TDX200M347/600 200kA/Phase, 247/600V, 3Ph, 4W+G
TDX200M480D 200kA/Phase, 480V, 3Ph DELTA, 3W+G*
TDX300S120/208 300kA/Phase, 120/208V, 3Ph, 4W+G
TDX300S120/240 300kA/Phase, 120/240V, 1Ph, 3W+G
TDX300S277/480 300kA/Phase, 277/480V, 3Ph, 4W+G
TDX400S120/208 400kA/Phase, 120/208V, 3Ph, 4W+G
TDX400S120/240 400kA/Phase, 120/240V, 1Ph, 3W+G
TDX400S277/480 400kA/Phase, 277/480V, 3Ph, 4W+G
TDX400S277/480T 400kA/Phase, 277/480V, 3Ph, 4W+G

* All S models are listed to UL1449 Ed 3 through Intertek (ETL).
** Replace M with S in part number for Surge Counter Option

IEC 61643-1
UL®1449 Ed 3 Listed

Surge Rated to Meet:
ANSI®/IEEE®C62.41.2-2002 Cat A, Cat B, Cat C
ANSI®/IEEE®C62.41.2-2002 Scenario II, Exposure 3, 100 kA 8/20µs, 10 kA 10/350µs
IEC 61643-1 Class I, Class II
UL®1449 Edition 3 In 20kA mode

ANSI is a registered trademark of the American National Standards Institute. cULus is a registered certification mark of UL LLC. ETL is a registered trademark of Intertek Testing Services NA, Inc. IEEE is a registered trademark of the Institute of Electrical and Electronics Engineers, Incorporated. NEC is a registered trademark of, and National Electric Code (NEC) standard is a copyright of the National Fire Protection Association, Inc. NEMA is a registered service mark of the National Electrical Manufacturers Association. UL is a registered trademark of UL LLC.


Coordinated Facility Protection Catalog

TDX Modular Diagnostic Sheet

Surge 10 Year Warranty