DoorKing 1877-010 Telephone Line Surge Suppressor for Extreme Power Spikes

Protect critical communications and entry systems from destructive power surges with the DoorKing Systems Telephone Line Surge Suppressor (model 1877-010). Engineered to absorb extreme voltage spikes on telephone and dataline connections, this surge suppressor keeps intercoms, gate controllers and monitoring equipment online—reducing downtime and costly hardware replacement. The 1877-010 is optimized for 24V AC input power commonly used in intercom and access control installations, and includes a plastic mounting bracket for fast, tidy installation in equipment cabinets or control boxes.

Built for security professionals, the DoorKing surge protector integrates seamlessly into surveillance and monitoring networks to guard voice and control lines where general power devices can’t. Made in the US and designed specifically for telephone dataline protection, it provides targeted defense that helps extend the service life of connected intercom and entry equipment.

Ideal for commercial gates, multi-tenant entry systems and surveillance sites, the DoorKing 1877-010 is a simple, reliable addition to any security or access-control deployment. Add it to your next installation or retrofit to improve system resilience—order today.

• Guards telephone and dataline connections from extreme voltage spikes to reduce downtime and equipment failure
• Fast, tidy installation with included plastic mounting bracket for field or cabinet mounting
• Designed for 24V AC systems common to intercoms, gate controllers and access-control hardware
• Lowers maintenance and replacement costs by protecting critical security and monitoring components
• US-made DoorKing model 1877-010 for dependable performance in professional security deployments