The WFCO T-30 and T-57R are automatic transfer switches designed for recreational vehicles (RVs) to manage power changeover between shore power and a generator. These devices ensure a smooth and safe transition of electrical power, preventing accidental coupling of power sources and protecting the RV's electrical system.
Function Description:
The primary function of both the T-30 and T-57R transfer switches is to automatically switch the RV's AC power source between an external shore power connection and an onboard generator. This automation eliminates the need for manual intervention, providing convenience and safety for RV users. The switches incorporate a "break before make" configuration, which means that the connection to one power source is completely disconnected before the connection to the other power source is established. This design is crucial for preventing short circuits, power surges, and other electrical hazards that could occur if both power sources were connected simultaneously.
A key feature of these transfer switches is the inclusion of DC coiled relays. These relays are specifically chosen to prevent AC "chatter" noise, which can be an annoying byproduct of some AC-powered relays, especially in low-voltage conditions. The DC coils also ensure that the relays do not "drop-out" or lose connection during periods of low voltage, maintaining a stable and reliable power supply to the RV's electrical system.
The transfer switches also feature a time delay mechanism for generator power. When the generator starts, there is a nominal 30-second delay before power is transferred to the RV. This delay allows the generator to complete its self-diagnostics and stabilize its output voltage and frequency before connecting to the RV's electrical load. This protects the RV's appliances and electronics from potential damage due to unstable power from a newly started generator.
Another important aspect of their functionality is that shore power is always available (pass-through) without needing to energize the relays. This means that when shore power is connected and active, it directly supplies power to the RV's distribution panel without engaging the transfer switch's internal relays, simplifying the power path and potentially reducing power losses.
Important Technical Specifications:
The WFCO T-30 and T-57R transfer switches differ primarily in their current capacity and input voltage configurations, catering to different RV electrical systems. Both models are ETL Certified to UL 1008 and CSA 22.2, ensuring they meet rigorous safety and performance standards.
T-30 Specifications:
- Input Voltage: 120 V ac / 60 Hz
- Current Capacity: 30 amps
- Time Delay: 30 Sec. (Nominal)
- Knockout Holes: 3
- Knockout Sizes: 1 x 1/2", 2 x 3/4"
- Outer Dimensions: 5 1/8"W x 6 1/4"H x 4 5/16"D
- Weight: 4.24 lb
- Environmental: 20 ~ 90% Non-condensing (non-condensing humidity)
- Certifications: ETL listed to UL 1008 and CSA 22.2
T-57R Specifications:
- Input Voltage: 120/240 V ac / 60 Hz
- Current Capacity: 50 amps
- Time Delay: 30 Sec. (Nominal)
- Knockout Holes: 10
- Knockout Sizes: 4 x 1/2", 4 x 3/4", 1 x 3/4" & 1-1/4" Concentric
- Outer Dimensions: 8 1/4"W x 9 1/4"H x 5"D
- Weight: 5 lb
- Environmental: 20 ~ 90% Non-condensing (non-condensing humidity)
- Certifications: ETL listed to UL 1008 and CSA 22.2
For both models, all field connections should be made using copper conductors. For the T-30, 10 AWG (minimum) solid or stranded copper wire rated 75°C (167°F) minimum is required, with ground bar terminals torqued to 35 in-lb maximum. For the T-57R, 8 AWG (minimum) solid or stranded copper wire rated 75°C (167°F) minimum is required, with terminal strip lugs and ground block terminals torqued to 35 in-lb maximum. Over-torquing can cause screw and wire damage.
Usage Features:
The WFCO transfer switches are designed for ease of installation and reliable performance in RV environments.
- Trouble-Free Changeover: The core benefit is the automatic and seamless transition between shore power and generator power, eliminating manual switching and potential errors.
- "Break Before Make" Configuration: This safety feature ensures that there is never a direct connection between the shore power and the generator, preventing electrical conflicts and damage.
- Generator Time Delay: The 30-second delay allows the generator to stabilize, protecting sensitive RV electronics and appliances from initial power fluctuations.
- Shore Power Always Available: When shore power is present, it flows directly to the RV's distribution panel without engaging the relays, ensuring a simple and efficient power path.
- DC Coiled Relays: These relays prevent "chatter" noise and ensure reliable operation even under low-voltage conditions, contributing to a quieter and more stable electrical system in the RV.
- Easy Mounting: Both models are designed to mount easily onto a flat surface. The T-30 offers additional flexibility with two mounting possibilities: it can be wall-mounted using included brackets or mounted to the back of a WF-8900 power center enclosure, saving wall space.
- Easy Ground Lug Accessibility: The T-57R specifically features built-in easy ground lug accessibility, simplifying the grounding process during installation.
Maintenance Features:
While the manual primarily focuses on installation and troubleshooting, some aspects relate to maintenance and safety during servicing:
- Installation and Servicing Precautions: The manual strongly emphasizes that installation and servicing should only be performed by a certified or licensed electrician familiar with applicable safety codes and installation requirements. This is a critical maintenance feature as it ensures that any work done on the device is safe and correct, preventing electrical shock or bodily injury.
- Disconnection of Power: A prominent warning advises disconnecting or isolating all power supplies before making electrical connections or performing any work on the transfer switch. This is a fundamental safety practice for maintenance, ensuring the equipment is de-energized to prevent electric shock.
- Wiring Conformance: All wiring must conform to local, national, and regional codes and regulations, and only copper conductors should be used. Adhering to these guidelines during installation and any subsequent maintenance ensures the long-term safety and proper functioning of the device.
- Spark Hazard Warning: The unit employs components that can produce arcs or sparks. Therefore, it must not be installed in compartments containing batteries or flammable materials (like LP gas) to prevent fire or explosion. This is a crucial consideration for both initial installation and any relocation or modification of the unit, impacting its "maintenance" environment.
- Warranty Information: WFCO provides a Two-Year Limited Product Warranty to the original owner, covering defects in material and workmanship under normal use. This warranty supports the product's longevity and provides recourse for manufacturing defects, reducing the burden of unexpected repairs for the consumer. The warranty process involves contacting an authorized OEM dealer or Arterra Distribution for assistance and obtaining a Return Goods Authorization (RGA) number for any defective product. This ensures that any necessary repairs or replacements are handled efficiently and correctly.
- Troubleshooting Instructions: The manual directs users to refer troubleshooting to a qualified service technician and provides contact information for Power PROs Technical Support, indicating that complex issues are best handled by experts rather than DIY attempts, which is a form of guided maintenance.
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