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Modular TDX Panel Protector, 300 kA


  • Transient Discriminating (TD) Technology provides increased service life
  • Modular design allows easy replacement of surge modules
  • Built-in features include TD Technology, thermal protection, short circuit current cartridge fusing and a surge counter
  • Status indication flag per mode, voltage presence LEDs, audible alarm and voltage-free contacts providing remote status monitoring
  • 300 kA 8/20 μs maximum surge rating provides protection suitable for service entrance, main-distribution panels and highly exposed applications


Part Number TDX300S120/208 TDX300S120/240 TDX300S277/480
Nominal System Voltage (Un) 120/208 V 120/240 V 277/480 V
Distribution System 3Ph 4W+G 1Ph 3W+G 3Ph 4W+G
Max Continuous Operating Voltage (Uc) 170/276 VAC 320/550 VAC
Stand-off Voltage 240/415 V 240/480 V 480/831 V
Frequency 50 – 60 Hz
Short Circuit Current Rating (SCCR) 200 kA
Nominal Discharge Current (In), IEC 40 kA 8/20 μs
Nominal Discharge Current (In), UL 20 kA 8/20 μs
Max Discharge Current (Imax), Per Phase 300 kA 8/20 μs
Impulse Current (Iimp), Per Mode 23 kA 10/350 μs
Voltage Protection Rating (VPR), L-N 800 V @ 3 kA 1,200 V @ 3 kA
Protection Modes L-N
Status Indication LED
Mechanical flag
Audible alarm
Surge Counter Yes
Technology TD technology with thermal disconnect
Over-current replaceable cartridge fusing
Remote Contacts Yes
Lead Length 30"
Lead Size #10
Ground Lead Length 36"
Temperature -40 to 176 °F
Enclosure Material Metal
Enclosure Rating IP 20
Mounting 3/4” straight nipple
Depth (D) 3 1/4"
Height (H) 10.4"
Width (W) 10.32"
Unit Weight 13 lb
Certification Details UL® 1449 Edition 4 Type 1/2, 20 kA Mode
Complies With ANSI®/IEEE® C62.41.2-2002 Scenario II, Exposure 3, 100 kA 8/20 μs, 10 kA 10/350 μs
IEC® 61643-1 Class I, Class II
Replacement Module TDS150M150 TDS150M277

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ANSI is a registered trademark of American National Standards Institute.
IEC is a registered trademark of the International Electrotechnical Commission.
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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.


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