The XTE/XLHP Series is a modular parallel suppressor designed for service entrance or downstream panelboard applications. The XTE/XLHP is a multi-stage suppression circuit consisting of field proven, fast acting 40mm MOVs. A triple 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 XTE/ XLHP 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
bulletRedundant Suppression Modules Per Phase (3 per phase)
bulletCopper Bus Bar Connection (1/4" Bus Bar)
bulletSolid State Bi-directional
bulletRedundant Operational Indicators (LED) to indicate loss of protection or curcuit fully operational
bulletHigh Energy Parallel Design for Category C3 applications for external mounting nnext to panelboards, switchgear or motor control centers
bulletFront Panel Alarm with Test/Silence Switch
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       N-G  
kA/phase      240k     160k
360kA/phase      360k     240k
480kA/phase      480k     320k
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: -40oC to +65oC
bulletExternal Mount NEMA 1 Standard
(Other NEMA enclosures are available)
bulletStandard Size: 21"x17"x4.5" (LxWxD)
bullet Weight: 35 Lbs.



Service Voltage






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

*Notes: "L-G voltage shown for /G option only.  XTE/9.91 not available with /CL Option  /G option not available on XTE/5.51, 6/61, 9.91 (3 wire DELTA).

Ordering information for Optional Features should be appended to the model number and seperated by a slash(/). Example: XTE/2XLHP/CL/DS/G

/CX Module Option increases the surge current capacity from 240kA/phase to 360kA/phase.

/CL Module Option increases the surge current capacity from 240kA/phase to 480kA/phase.

/DS Integral Disconnect Switch when a spare 3 pole breaker is not available for connecting the suppressor, order with an internal disconnect.

[Increases size to 24"x24"x7 (LxWxD)] Other disconnect options available.

/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 thesuppressor and is supplied with a lithium battery to provide power to the counter in the event of a power failure.

/2S Dual LCD Surge Counters (Separate counter for L-N and L-G modes).

/G Adds L-G mode of protection in WYE configurations.