Alarm, Sound Video Surge Protection

PB Series for Intercom/Speakers

PB modules are solid-state surge protectors for Intercom Extension Pairs. As a new alternative to the "OPX", our standard intercom surge protector, the PB adds fusing and a new component layout. These hybrid protectors are intended to be used in conjunction with the MGB ground rail and a standard M1-50 punch-down block. (See Technical Bulletin 2017 for installation.) The PB modules feature solid-state resettable fuses (PTCs) between the protected equipment and the over voltage clamping components. This unique design prevents problems with "All-Call" in the event of catastrophic surge protector failure.

PB CLN modules provide internal bridging and are intended for use on call-in circuits.
PB-SPK modules provide internal bridging and are intended for use on speaker circuits.


bulletOver-current protection - resettable fuses
bulletReplaces bridging Clips on M-50 block
bulletUL 497B Listed
bulletUtilizes MGB grounding rail
bulletTest point

Part No. Max Signal V Nominal
Max Peak
Pulse Current
Ip 10x1000Ás
Max Clamp
Voltage @ Ip
Typ Cap
12 Vdc 15 21 124 25 2100
35 Vrms 56 70 200 105 1800

CAUTION: The hybrid design of this product includes series resistance. Do not place this product in service on any signal lines capable of supplying more than 150mA continuously.

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