Southwire 50A RV Automatic Transfer Switch | 40101-001 | 120/240V

Automate the power switchover in your dual-source RV electrical system with the Southwire 40101-001 50 Amp Reverse Polarity Automatic Transfer Switch. This permanent-install ATS seamlessly handles the switch between shore power and generator power — automatically prioritizing your generator when it's running and reverting to shore power when the generator shuts down. The right component for any RV that needs reliable, hands-off transitions between shore and generator power sources, with the added safety of integrated reverse polarity and open ground monitoring. How the 40101-001 Manages Your Power Sources The Southwire 40101-001 is a generator-dominant automatic transfer switch — meaning when both shore power AND generator power are available simultaneously, the generator takes precedence. Here's how it operates in real-world use: Shore power only: The ATS routes shore power to your RV's electrical loads Generator starts up: After a 30-second delay (allowing the generator to stabilize), the ATS transfers the load from shore to generator Generator shuts down: After a 3-4 second delay, the ATS transfers the load back to shore power for continuous, uninterrupted operation Generator only: The ATS routes generator power directly to your RV That generator-dominant logic is the typical preference for RV owners — when you fire up the generator, you generally want it to take over (often because shore power is unreliable, you've moved off-grid, or you need additional capacity). The 40101-001 handles all of this automatically, with no manual switching required. 50 Amp Service with 80A UL-Listed Capacity The 40101-001 is engineered for 50 amp RV electrical service — the standard for larger RVs, fifth wheels, and motorhomes. However, the unit is UL-listed for up to 80 amps capacity, providing meaningful headroom over its rated service level: 50A rated continuous service — sized for typical 50A RV loads 80A UL-listed capacity — handles transient inrush currents and high-demand cycling without strain Dual contactor arrangement for reliable load switching Mechanical interlocking contactors — prevents both contactors from closing simultaneously (critical safety feature) Integrated Reverse Polarity Detection The 40101-001 includes LED indicators for reverse polarity and open ground conditions — meaningful safety features for buyers connecting to unfamiliar shore power pedestals: Reverse polarity LED — warns when shore power has incorrect line/neutral wiring (a real safety hazard at older or improperly maintained campgrounds) Open ground LED — warns when shore power lacks proper ground connection Visual at-a-glance status — see immediately if the pedestal you're plugged into has wiring problems before powering up sensitive electronics Reverse polarity is particularly important for RV electrical safety — when line and neutral are swapped, components that should be at neutral voltage become live, creating shock hazards even when appliances appear "off." The 40101-001's monitoring catches this before damage or injury can occur. Time Delay at Power Up — Component Protection The 40101-001 features time delay at power up — preventing immediate load transfer when power sources energize. This protects sensitive electronics in your RV by allowing power sources to stabilize before connecting them to load. ⚠️ NOT a Surge Protector Important clarification: the 40101-001 is an automatic transfer switch — NOT a surge protector. It does not provide surge protection or voltage stabilization. If your RV electrical system needs surge protection, you should install a dedicated RV surge protector at the shore power connection — separate from this ATS. The 40101-001's job is power source switching, not voltage event protection. Both serve important but different roles in a complete RV electrical safety setup. 120V / 240V Compatibility The 40101-001 operates on standard RV 120V/240V electrical service at 60 Hz — compatible with both shore power pedestals and standard RV generator output configurations. Permanent Installation Design The 40101-001 is engineered for permanent installation in your RV's electrical compartment — not a temporary or portable transfer switch. Once installed, it provides automated power source management for the life of the RV without requiring manual intervention. Dimensions and Specifications Length/Depth: 10.75" Width: 8.48" Height: 5.19" Weight: 8.78 lbs Voltage: 120V/240V Frequency: 60 Hz Contactor Rating: 50A FLA (Full Load Amps) UL Capacity: Up to 80A ⚠️ Professional Installation Required Automatic transfer switch installation involves working with high-current AC electrical wiring (50A service is substantial), connecting both shore power and generator power feeds, and integrating with the RV's main electrical panel. Improper installation can result in fire hazards, electrical damage, electrocution risk, or non-compliant electrical work. Installation should be performed by a qualified RV electrician or service technician with experience working on 50A RV electrical systems. Limited Lifetime Manufacturer Warranty The 40101-001 is backed by Southwire's limited lifetime manufacturer warranty — meaningful protection for a component that should provide many years of reliable service. ⚠️ California Proposition 65 Warning This product may contain materials cautioned by California Proposition 65. Buyers in California should review applicable Prop 65 disclosures. Genuine Southwire OEM As a Southwire factory unit, the 40101-001 delivers OEM engineering and quality for permanent RV electrical installations. Key Features Genuine Southwire 50A automatic transfer switch Generator-dominant switching logic — generator takes priority over shore when both available 30-second delay on transfer to generator (allows stabilization) 3-4 second delay on transfer back to shore power UL-listed up to 80A capacity — meaningful headroom over 50A rated service Reverse polarity LED indicator — safety warning for incorrect shore wiring Open ground LED indicator — safety warning for missing ground Mechanical interlocking contactors — prevents simultaneous closure (safety) Dual contactor arrangement Time delay at power up for sensitive component protection 120V/240V, 60Hz compatibility Permanent installation design Does NOT provide surge protection (use a separate dedicated surge protector for that) Limited lifetime manufacturer warranty Dimensions: 10.75" L × 8.48" W × 5.19" H Weight: 8.78 lbs Specifications Brand: Southwire Part Number: 40101-001 Type: 50 Amp Reverse Polarity Automatic Transfer Switch Amperage: 50A rated, UL-listed up to 80A Contactor Rating: 50A FLA Voltage: 120V/240V Frequency: 60 Hz Polarity Type: Reverse (with monitoring) Generator-Dominant: Yes Time Delay to Generator: 30 seconds Time Delay to Shore: 3-4 seconds Time Delay at Power Up: Yes Indicators: Reverse polarity LED, Open ground LED Contactor Arrangement: Dual, mechanically interlocked Surge Protection: NOT included (separate surge protector required for voltage event protection) Installation: Permanent UL Listed: Yes Dimensions: 10.75" L × 8.48" W × 5.19" H Weight: 8.78 lbs Warranty: Limited lifetime manufacturer warranty California Proposition 65: Product may contain Prop 65 cautioned materials