Modular TDX Panel Protector- 100kA – 277/480 V Un – 3Ph 4W+G

The TDX100 series of Transient Voltage Surge Suppressors is designed for critical protection applications. The 100 kA 8/20 μs of surge protection meets the IEEE C62.41.2 Scenario II single shot surge rating requirements for exposed service entrance locations- Exposure 3.

The NEMA-4 weather tight housign 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 ti 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.

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

Main Features

  • Transient Discriminating (TD) Technology provides increased service life
  • Modular design allows easy replacement of surge modules
  • Built-in features include TD Technology, thermal protection and short circuit current fusing
  • Compact NEMA®-4 enclosure design can be flush mounted or installed in a small space
  • Status indication flag per mode, voltage presence LEDs, audible alarm and voltage-free contacts providing remote status monitoring
  • 100 kA 8/20 μs maximum surge rating provides protection suitable for main-distribution panels and an extended operational life


Part NumberTDX100M277/480TT
Nominal System Voltage (Un)277/480 V
Distribution System3Ph 4W+G
Max Continuous Operating Voltage (Uc)320/550 VAC
Stand-off Voltage480/831 VAC
Frequency50 – 60 Hz
Protection ModesL-N
Short Circuit Current Rating (SCCR)200 kA
Nominal Discharge Current (In)40 kA 8/20 μs
Max Discharge Current (Imax), Per Phase100 kA 8/20 μs
Impulse Current (Iimp), Per Mode12.5 kA 10/350 μs
25.0 kA 10/350 μs N-PE
Voltage Protection Rating (VPR), L-N1,200 V @ 3 kA
1,800 V @ 20 kA
Status IndicationLED
Mechanical flag
Audible alarm
Surge CounterNo
TechnologyTD technology with thermal disconnect
Over-current replaceable cartridge fusing
Remote ContactsYes
Lead Length762 mm
Lead Size5.26 mm²
Ground Lead Length914 mm
Temperature-40 to 80 °C
Enclosure MaterialMetal
Enclosure RatingIP 65
Mounting3/4” straight nipple
Depth (D)78 mm
Height (H)240 mm
Width (W)84 mm
Unit Weight1.41 kg
Certification DetailsUL® 1449 Edition 4 Type 1/2, 20 kA Mode
Complies WithANSI®/IEEE® C62.41.2-2002 Cat A, Cat B, Cat C
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 ModuleTDS150M277
Standard Packaging Quantity1 pc



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