1. Introduction
The Esco ES50M-65N is an automatic transfer switch designed to manage power sources between a shore power connection, a generator, and an inverter. This device ensures a seamless and automatic transition of electrical load, providing continuous power to your system. It is engineered for rigorous use, handling a 50 amp power cord and generators up to 12kW. The unit transfers both hot and neutral legs simultaneously and includes features for monitoring low generator voltage.
Please read this manual thoroughly before installation or operation to ensure proper function and safety.
2. Important Safety Information
WARNING: This device operates with high voltage electricity. Improper installation or use can result in serious injury, death, or property damage. All electrical work should be performed by a qualified electrician or certified technician in accordance with all applicable electrical codes and standards.
- Always disconnect all power sources (shore power, generator, inverter) before installing, servicing, or inspecting the transfer switch.
- Ensure proper grounding of the unit.
- Do not operate the unit if it appears damaged or if any wiring is exposed.
- Verify all connections are secure and correctly wired before restoring power.
- Keep children and unauthorized personnel away from the installation area.
- Wear appropriate personal protective equipment (PPE) when working with electrical systems.
3. Product Overview
The Esco ES50M-65N Automatic Transfer Switch is housed in a durable gray enclosure, designed for pole mounting. It features heavy-duty contactor assemblies for reliable power transfer.
Figure 1: Internal view of the Esco ES50M-65N Automatic Transfer Switch. The image displays the robust internal components, including the contactors and wiring connections, within its gray metal housing. This view illustrates the primary electrical pathways for power transfer.
Key Features:
- Automatic switching between shore power, generator, and inverter.
- Heavy-duty contactor assembly for demanding applications.
- Handles 50 amp power cords and generators up to 12kW.
- Simultaneous transfer of hot and neutral legs.
- Economical and reliable time delay for automatic switching.
- Capable of monitoring for low generator voltage.
4. Installation
IMPORTANT: Installation of the Esco ES50M-65N Automatic Transfer Switch must be performed by a qualified and licensed electrician. Incorrect installation can lead to electrical hazards, equipment damage, and void the product warranty.
General Guidelines:
- Mounting: Securely mount the transfer switch in a dry, protected location, away from direct weather exposure. The unit is designed for pole mounting. Ensure adequate ventilation around the unit.
- Wiring:
- Identify and label all incoming power lines (shore power, generator, inverter) and the outgoing load line.
- Connect the shore power input to the designated terminals.
- Connect the generator input to the designated terminals.
- Connect the inverter input (if applicable) to the designated terminals.
- Connect the main load output to the designated terminals.
- Ensure all connections are tight and use appropriate wire gauges for 50 amp service and 12kW generator capacity.
- Properly ground the unit according to local electrical codes.
- Testing: After installation, carefully test the transfer switch operation with a qualified electrician to ensure correct functionality and safety before full use.
5. Operating Instructions
The Esco ES50M-65N is designed for automatic operation, requiring minimal user intervention once properly installed.
- Automatic Power Source Prioritization: The transfer switch is typically configured to prioritize one power source (e.g., shore power or inverter) over others. When the primary source is available, the switch will connect the load to it.
- Generator Activation: When the primary power source is lost, the transfer switch will detect the absence of power. If a generator is connected and starts, the switch will automatically transfer the load to the generator after a pre-set time delay. This delay allows the generator to stabilize before connecting the load.
- Return to Primary Source: Once the primary power source is restored, the transfer switch will detect its presence and, after another time delay, automatically transfer the load back to the primary source. The generator will then shut down (if configured to do so).
- Low Generator Voltage Monitoring: The unit monitors generator voltage. If the generator voltage drops below an acceptable level, the switch may prevent transfer to the generator or disconnect from it to protect connected appliances.
No manual intervention is typically required for routine power transfers. Ensure all power sources are functioning correctly and are properly connected to the transfer switch.
6. Maintenance
Regular inspection and maintenance can extend the life of your Esco ES50M-65N Automatic Transfer Switch and ensure reliable operation. Always disconnect all power sources before performing any maintenance.
- Annual Inspection: Have a qualified electrician inspect the unit annually.
- Check Connections: Verify that all electrical connections are tight and free from corrosion. Loose connections can cause overheating and poor performance.
- Cleanliness: Keep the interior of the enclosure clean and free from dust, debris, and insects. Use a dry, non-conductive brush or vacuum.
- Physical Damage: Inspect the enclosure for any signs of physical damage, cracks, or corrosion. Ensure all seals are intact to prevent moisture ingress.
- Functionality Test: Periodically test the automatic transfer function by simulating a power outage (e.g., by disconnecting shore power) to ensure the generator starts and the switch transfers correctly.
7. Troubleshooting
If you experience issues with your Esco ES50M-65N, refer to the following common problems and solutions. For complex issues, contact a qualified electrician.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power to load from any source. | No incoming power (shore, generator, inverter). Tripped circuit breaker. Faulty wiring. | Verify power availability from all sources. Check and reset circuit breakers at the source and load. Inspect wiring for loose connections or damage (qualified electrician only). |
| Switch does not transfer to generator. | Generator not running or not producing power. Low generator voltage detected. Time delay setting. Faulty control board. | Ensure generator is running and producing stable power. Check generator output voltage. Allow sufficient time for the transfer delay. Contact a qualified electrician for inspection. |
| Switch does not transfer back to shore power. | Shore power not restored or unstable. Time delay setting. Faulty control board. | Verify shore power is stable and available. Allow sufficient time for the transfer delay. Contact a qualified electrician for inspection. |
| Humming noise from the unit. | Normal operation of contactors. Loose components. | A slight humming is normal for contactor-based switches. If excessively loud or new, have a qualified electrician inspect for loose components. |
8. Specifications
| Feature | Detail |
|---|---|
| Model | ES50M-65N |
| Operation Mode | Automatic |
| Current Rating | 50 Amps |
| Operating Voltage | 240 Volts AC |
| Contact Type | Normally Open (N.O.) |
| Connector Type | Crimp |
| Terminal Type | Spade |
| Circuit Type | 3-way |
| Mounting Type | Pole |
| Actuator Type | Rotary |
| Contact Material | Copper |
| International Protection Rating | IP54 |
| Number of Positions | 3 |
| Control Method | Touch (referring to internal controls/settings) |
| Connectivity Protocol | X-10 (Note: This might be a generic specification, actual implementation may vary or be for specific models) |
| Color | Gray |
| Wattage | 12000 watts (12kW) |
| Product Dimensions (L x W x H) | 12 x 12 x 12 inches |
| Item Weight | 9 pounds |
| Manufacturer | Esco |
9. Warranty and Support
For specific warranty information and technical support, please refer to the documentation provided with your purchase or contact Esco customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
It is recommended to register your product with Esco to receive updates and facilitate support.
