Building Entrance 5Pin Modules

Asymmetrical Operation





The CT3BS/HD "Heavy Duty" series of 5 pin solid state protector modules are designed to provide "Heavy Duty" transient and power fault protection for most standard telephone line applications. A specially designed semiconductor substrate offers substantially higher surge current handling capability and meets the requirements of Bellcore TR-NWT-001089, "First and Second Level Lightning Surge Test." The characteristics of the solid state protector are far superior to gas tube technology in speed of response to faults and are virtually immune to overshoot, aging, and repeated tripping within rated limits. Nominal breakdown voltage for the CT3B1S/HD is 300V.

Where extra protection against over current or "sneak current" conditions is desired, PTC or "self resetting" polymer fused versions are available.


The CT3B1S/HD "Heavy Duty Series" are well suited to applications with building entrance terminals as well as central office protectors where extra current handling capability might be required due to higher exposure conditions.

Features & Benefits

bulletSolid state technology provides nanosecond response time
bulletMeets Bellcore First and Second Level Surge Test TR-NWT-001089
bulletLonger lifespan than conventional gas tube and carbon arrestors
bulletExternal failsafe mechanism which permanently grounds module under sustained high current conditions
bulletReduced "let through" of dangerous transients
bulletOptimum protection for higher exposure locations
bulletReduced service calls
bulletSafe mode operation in adverse situations
bulletUL listed Documented safe performance






  DC Breakdown (nominal)





1Vrms@1KHZ, 50VDC



  Peak Pulse Current (max)11


  Insulation Resistance


 @ 10 x 1000 Ásec (1000V)



>100M ohms

@2 x 10 Ásec (2500V)



@2 x 10 Ásec (5000V)


Fail-safe Operation


@1.0 A

<50 sec

  Holding Current


 @5.0 A

<15 sec


@20 A

>10 sec

Surge life
(min operations)2


@60 A

<3 sec

@10A, 10 x 1000 Ásec



@100A, 10 x 1000 Ásec



@1Arms, 1 sec



@10 Arms, 1 sec


1total surge rating is 2x listed with respect to ground during a simultaneous surge
2service life requirement as per Bellcore TR-NWT-000974
3pin alloy refers to tip and ring pins. Unless otherwise noted, all ground pins are tin

Return to Comm-Omni Home Page


To speak to one of our consultants, please call us at 1-800-543-8790