Modular TDX Transient Voltage Surge Suppressors  – 200kA – 277/480 V Un – 3Ph 4W+G

The TDX200 series of Transient Voltage Surge Suppressors is designed for critical protection applications. The 200 kA 8/20 μs 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 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.

200kA 8/20μs maximum surge rating provides protection suitable for service entrance, main-distribution panels and highly exposed applications.

Transient Voltage Surge Suppresors Installations New Zealand


  • 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.
  • 200kA 8/20μs maximum surge rating provides protection suitable for service entrance, main-distribution panels and highly exposed applications.

Frequently Asked Question

Q: What is the recommended protection size (fuse) for the TDX200M277480TT?

A: Circuit breakers or HRC fuses are to be used as external protection, and existing protection may be used if it meets the following requirements. HRC fusing or D-curve breakers are less likely than C-curve breakers to suffer from nuisance tripping. This external fusing is primarily for protection against fault of the surge protection circuit wiring rather than failure of the surge diverter, so it is important to remember that the fuses/circuit breakers rating are limited by the connection wiring size as per standard wiring regulations. As TDX models are supplied with 5.26mm2 leads pre-fitted then 32A fusing would be typical.


Part NumberTDX200M277/480TT
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
Short Circuit Current Rating (SCCR)200 kA
Nominal Discharge Current (In)80 kA 8/20 μs
Max Discharge Current (Imax), Per Phase200 kA 8/20 μs
Impulse Current (Iimp), Per Mode25 kA 10/350 μs
50 kA 10/350 μs N-PE
Voltage Protection Rating (VPR)1,000.0 V @ 3 kA L-N
1,800.0 V @ 20 kA L-N
Protection ModesL-N
Status IndicationLED
Mechanical flag
Audible alarm
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
Surge CounterNo
Depth (D)78 mm
Height (H)240 mm
Width (W)130 mm
Unit Weight2 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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