Black Box 240V 4-Wire elco RJ-11 Data Surge Protector

The Black Box SP365A-R2 is a data surge protector engineered for RJ-11 telephone lines, giving your communication devices reliable defense against sudden voltage spikes. It is an easy way to safeguard fax machines, standard telephones, dial-up modems, and point-of-sale terminals that cannot afford unexpected downtime.

A 240 volt clamping circuit reacts quickly to divert excess energy, while a 75 amp surge rating provides generous headroom for lightning strikes or power irregularities. The design introduces very little shunt capacitance, so voice calls stay clear and data connections keep their expected speed.

Installation takes only a moment. Connect the cable from the wall jack to the protector’s female RJ-11 port, attach your device to the male lead, and you are ready to go. The pass-through layout supports four-wire pinouts while shielding the two active signal conductors, making it suitable for both single-line and multi-line systems without re-terminating cables.

A compact housing slips behind desks, inside wiring closets, or next to reception counters without adding clutter. CE approval confirms that the unit meets recognized safety standards, providing peace of mind for offices, retail stores, call centers, and home workspaces that rely on uninterrupted phone or modem service.

Highlights:

• 240 volt clamping voltage limits damaging spikes
• Handles surges up to 75 amps
• RJ-11 interface with four-wire pass-through for quick installation
• Low shunt capacitance helps maintain clear voice and data signals
• Works with fax machines, telephones, dial-up modems, and POS terminals
• CE approved for safety compliance