The TE/XT Series is a parallel suppressor designed for service entrance or downstream panelboard applications. The TE/XT is a multi-stage suppression circuit consisting of field proven, fast acting 40mm MOVs. A redundant surge suppression path is provided for each mode (L-N or L-L, L-G, N-G) guaranteeing continuous service. Each surge suppression module is individually fused and utilizes APT’s Patent Pending TranSafe ™ circuitry with thermal cutout to ensure safe operation during severe over-voltages and high fault current conditions. The suppression elements are encapsulated in UL Listed and Patented Ceramgard ® providing another level of safety. A filter network is added to provide wave shape smoothing and a high level of EMI/RFI noise attenuation. 

On-line diagnostics continuously monitor the unit status and feature redundant LEDs to signal a reduction in surge capacity or loss of a suppression circuit. An audible alarm with test and silence features is included in the standard diagnostic package. All APT products are designed and tested in accordance with the recommendations and procedures of ANSI/IEEE C62.41 and C62.45. The TE/XHP is UL 1449 Second Edition Listed, and qualified for service entrance applications under Section 37.3 for their most severe, 25kA, fault current test.

Design Features

bulletIndividually Fused Suppression Modules
bulletThermal Cutout
bulletSolid State Bi-directional
bulletOperational Indicators (LED) to indicate loss of protection or circuit fully operational
bulletHigh Energy Parallel Design for Category A, B, and C3 applications
bulletFor External Mounting next to panelboards, switchgear or motor control centers
bulletAC Tracking Filter with EMI/RFI Filtering up to -50dB from 100kHz to 100MHz


bulletFive Year Warranty: Includes unlimited module replacement
bulletBurn-in Tested Prior to Shipment
bulletShort Circuit Withstand Tested to 100KAIC 

Performance Features

bulletSurge Capacity    L-N     L-G     N-G
120kA/phase        80k     40k    120k
160kA/phase        60k     80k    120k
240kA/phase       120k   120k   120k
bulletUL 1449 Second Edition Listed, 1283 recognized and CUL
bullet200KAIC Rated Fusing
bulletLess than 1/2 Nanosecond Response Time
bullet5000 Category C3 Impulses with <10% Drift

Environmental Features

bulletRelative Humidity Range: 0 - 95% non-condensing
bulletOperating Frequency: 47 - 63 Hz
bulletOperating Temperature: 0oC to +60oC
bullet External Mount NEMA 1 Standard (other NEMA enclosures are available)
Standard Size: 8.25"x 8.25"x 5.5" (LxWxD)
bulletWeight: 21 Lbs.



Service Voltage






TE/1XT 120/240V Split Phase 330 330 330 700 150
TE/11XT 120V Single Phase 330 330 330 150
TE/12XT 240V Single Phase 600 600 600 275
TE/2XT 120/208V 3-Phase, Wye 330 400 330 600 150
TE/3XT 120/240V 3-Phase hi-leg Delta 330/
330 700/
TE/4XT 277/480 3-Phase WYE 700 7 600 1200 320
TE/5 480V 3-Phase De;ta   1500   1500 575
TE/51XT 480V 3-Phase corner grnd Delta   1500   1500 575
TE/6XT 240V 3-Phase Delta   700   700 275
TE/61XT 240V 3-Phase Corner grnd Delta   700   700 275
TE/7XT 220/380V 3-Phase Wye 700 700 600 1200 320
TE/8XT 347/600V 3-phase Wye 1000 1000 900 1800 420
TE/9XT 600V 3-Phase Delta   1500   1800 750
TE/91XT 600V 3-Phase corner grnd Delta   1500   1800 750


Ordering information for Optional Features should be appended to the model number and seperated by a slash(/).

Example: TE/2XT/240/DC

/160 Module Option increases the surge current capacity from 120kA/phase to 160kA/phase.

/240 Module Option increases the surge current capacity from 120kA/phase to 240kA/phase.

/DC The Dry Contacts monitor each phase providing a summary alarm. The contacts are terminated in a DB-9 connector.

/RM Remote Monitor with indicator lights and audible alarm is available for use with the Dry Contact Option.

/SC Surge Counter option monitors the occurrence of transients entering the facility through the suppressor and is supplied with a lithium battery to provide power to counter in the event of a power failure.

/FM Flush Mount option replaces the standard surface mount enclosure.

/04 NEMA 4/3R enclosure. Requires customer installed liquid tight conduit fittings for input wiring.

/12 NEMA 12 enclosure.