RJ31120-MDP SPACE AGE

Product Overview

The Space Age Electronics RJ31120-MDP is a high-performance, low-voltage Transient Voltage Surge Suppressor (TVSS) engineered explicitly to protect sensitive telecom equipment from transient voltage spikes and lightning-induced surges on RJ31X communication loops. Commonly deployed on fire and burglary 31X alarm dialers and building entrance telephone lines, this module implements multi-stage hybrid solid-state protection using a combination of Silicon Avalanche Diodes (SAD) and Metal Oxide Varistors (MOV). The "MDP" variant features integrated self-restoring current-limiting circuitry rated for a maximum continuous current of 150mA and a 120V clamping threshold. This modular, scalable design allows for efficient system modifications, preventing interruptions to Recurring Monthly Revenue (RMR) based monitoring systems and minimizing non-billable service calls.

Key Features

• Dedicated RJ31X Dialer Protection: Optimized for 2-wire RJ31X security and fire alarm digital communicator loops, as well as building entrance telephone paths.
• Low Voltage Architecture with 120V Clamping: Designed for low-voltage signal lines, utilizing a 120V clamping voltage threshold (144V MCOV). Note: Not rated for 120VAC mains power.
• Integrated Current Limiting (MDP): Equipped with self-restoring, active current-limiting protection pathing with a maximum continuous operating current of 150mA.
• Hybrid Multi-Stage Topology: Combines high-speed Silicon Avalanche Diodes (SAD) and high-energy Metal Oxide Varistors (MOV) for sub-picosecond clamping response times.
• Scalable and Field-Swappable: Part of a modular system layout that allows for rapid field moves, additions, and layout changes without rewiring the base footprint.
• Single-Point Grounding: Features dedicated single-point grounding paths to ensure reliable shunt performance away from delicate communication circuits.
• UL 497A Listed: Certified as an approved communications loop protector.