FS140 | Siemens FirstSurge Pro 140kA Whole House Surge Protector

The Siemens FS140 FirstSurge™ Pro Surge Suppressor is a premium whole-home surge protection device designed to safeguard residential electrical systems from damaging voltage spikes. With an industry-leading 140kA surge capacity, this unit provides robust protection for sensitive electronics, appliances, and smart home systems. Engineered for maximum reliability, the FS140 features advanced monitoring with LED indicators and audible alarms to notify users of system status and potential issues. Its Ground Reference Monitoring (GRM) technology detects improper grounding conditions, enhancing overall electrical safety. Built with a durable Type 4 / NEMA-rated enclosure, this unit is suitable for both indoor and outdoor installations. Highlights 140kA surge protection capacity for maximum whole-home protection Ultra-fast response time (~1 nanosecond) Ground Reference Monitoring (GRM) detects wiring issues LED indicators and audible alarm for status monitoring Commercial-grade protection for residential applications Type 4 / NEMA enclosure for indoor or outdoor installation Protects entire electrical system including appliances and electronics Designed for panel-mounted installation Specifications SKU FS140 Manufacturer Siemens Product Whole House Surge Suppressor Series FirstSurge™ Pro Surge Capacity 140 kA Voltage 120/240V Phase 1 Phase Frequency 50/60 Hz Response Time ~1 Nanosecond Mounting Surface Mount (Panel Connected) Indicator Type LED + Audible Alarm Enclosure Rating Type 4 / NEMA Rated (Indoor/Outdoor) Temperature Range -40°C to +60°C Standards UL 1449 Listed Applications Residential homes, smart homes, sensitive electronics protection Documents FirstSurge SPD Canadian Datasheet