Contact us for an immediate quote at

RMSP-DT-12 - 19" Rack Mount 12-Line Hi-Power Telephone/DSL/T1 Lightning Surge Protector - RJ11 Jacks




Due to new Brexit EU Trading rules from 1st January 2021, we are no longer able to process small orders for delivery to EU countries less than Euro 150 (£135). This will be a temporary situation until our web site and accounting systems are updated.

In the meantime, for all orders, please contact our technical sales team at or phone us on +44 1202 872771 to discuss your requirements.

We apologise for any inconvenience this may cause.

Also please note that import duties, taxes and any additional delivery or clearance charges, are not included in the item price or the quoted shipping cost. These charges are the responsibility of the Buyer. Please check with your local customs office to determine any additional charges prior to purchase.

Continue Shopping or View Cart

The RMSP-DT-12 is a high performance 3-stage lightning protector that provides superior protection for up to 12 DSL, Telephone and T1 lines from transients and surges. Failsafe Feature. The RMSP-DT-12 is designed to convert into a failsafe mode in the rare case of a catastrophic surge or lightning event. For this mode, the resistors in the second stage will fuse and portions of the diode array will short. This effectively disconnects the line from sensitive equipment thus limiting damage. The individual protector modules are field replaceable. The RMSP-DT-12 features 24 RJ11 jacks for ease of installation. The 2U rack panel features a clean, system wide mounting of the circuit protectors and may be installed in the rear of the 19 inch rack where they are normally required for line in and out. For additional information and complete specifications, see data sheet below. This protector is also available in a 4-line rack mount version, see RMSP-DT-4.