Description
Progressive Dynamics 50 Amp 120/240 VAC Automatic Transfer Switch — PD52 (5200 Series)
The PD52 is a heavy-duty, RV-grade automatic transfer switch that cleanly switches your coach or tiny-home system between shore power and generator (or inverter) power. It uses interlocked 2-pole contactors to prevent backfeed and incorporates a time-delay start so the generator can stabilize before it is allowed to carry the load.
Once shore power returns and stabilizes, the unit re-transfers automatically with a brief delay to protect connected appliances. A rugged galvanized-steel enclosure, screw-type landing lugs, and a simple layout make installation straightforward for 120/240 V split-phase 50 A services.
The PD52 prioritizes safe, reliable transfer under high loads, supports auto-gen-start detection on select variants, and is built for years of service in motorhomes, fifth-wheels, and advanced van/RV conversions where code-compliant switching and uptime matter.
Technical Specifications
| Category | Specification |
|---|---|
| Model | PD52 / PD52V (5200 Series) |
| Service | 120/240 VAC split-phase (2 × 120 V legs) |
| Amperage rating | 50 A per leg (neutral commonly rated to 70 A) |
| Frequency | 60 Hz |
| Inputs | Shore (L1/L2/N/G), Generator or Inverter (L1/L2/N/G) |
| Output | To main AC distribution/breaker panel (L1/L2/N/G) |
| Transfer method | Dual mechanically interlocked contactors (switches L1 & L2; neutral solid) |
| Generator delay (typ.) | ~20–30 s on generator start before transfer |
| Re-transfer delay (typ.) | ~3–5 s when returning to shore |
| Priority | Generator (when present and stable) |
| Surge/AGS | “DCS/DCSV” variants add silent surge suppression & AC-detect for auto-gen-start systems |
| Wiring terminations | Heavy-duty screw lugs; copper conductors sized for 50 A service (e.g., 6 AWG Cu typical) |
| Enclosure | Galvanized steel, removable cover with internal wiring diagram |
| Knockouts | Multiple circular knockouts for conduit/strain-relief |
| Dimensions (approx.) | 10.3 in L × 6.9 in W × 4.5 in H |
| Weight (approx.) | 7–10 lb (by variant) |
| Operating temp | −20 °C to +50 °C typical RV environment |
| Listings | Designed to RV industry standards; components agency-recognized |
| Typical applications | RVs, fifth-wheels, toy haulers, mobile offices, tiny homes with 50 A split-phase |
Installation notes
-
De-energize all sources; follow NEC/RVIA and manufacturer torque specs.
-
Land conductors to labeled lugs (Shore, Gen/Inverter, Load) and verify bonding/neutral scheme per your panel.
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Maintain clearance for ventilation and service; keep wiring neat to reduce heat and simplify troubleshooting.
Specs & Info