What Is a Transfer Switch?
A transfer switch is an electrical switching device that transfers power supply from one source to another, typically from grid power to a generator or inverter, or from an inverter back to grid power. Transfer switches prevent two power sources from connecting simultaneously, which would create dangerous back-feeding conditions. Every off-grid system with a backup generator, every grid-tied system with battery backup, and every commercial or residential standby generator installation in Canada requires a transfer switch for safe and legal operation.
Types of Transfer Switches at Volts Energies
Automatic Transfer Switches
Automatic transfer switches (ATS) detect a loss of primary power and switch to the backup source without any manual intervention. When primary power is restored, the ATS automatically transfers back. Automatic transfer switches are essential for off-grid cabins, remote properties, and medical or commercial facilities where uninterrupted power is critical.
Manual Transfer Switches
Manual transfer switches require a physical switching action to transfer between power sources. They are simpler, lower cost, and suitable for installations where an operator is always present to manage power source changes.
Transfer Switches for Canadian Off-Grid and Backup Power Systems
Transfer switches are a critical component in two common Canadian power scenarios:
Off-Grid Systems with Generator Backup
Canadian off-grid properties, cabins, farms, and remote homes in Ontario, BC, Alberta, and Northern Canada, typically run on solar panels with battery storage as the primary power source and a diesel or propane generator as backup. A transfer switch connects both sources to the load panel, ensuring the generator can take over automatically when the battery state of charge drops below a set threshold during extended low-sun periods.
Grid-Tied Systems with Backup Power
Urban and suburban Canadian homes with grid-tied solar and battery backup systems use transfer switches to disconnect from the grid during an outage and switch to inverter power. This is required by the Canadian Electrical Code for grid-tied battery backup systems to prevent back-feeding power onto the utility grid.
FAQs
Do I Need A Transfer Switch For A Generator In Canada?
Yes. Canadian Electrical Code requires a transfer switch for any generator connected to a home or building wiring system. Without a transfer switch, generator power can back-feed onto the utility grid, creating a lethal hazard for utility workers restoring power after an outage.
What Is The Difference Between The Victron Filax 2 And The VE Transfer Switch?
The Filax 2 is a fast-acting transfer switch rated up to 16A, designed for direct connection to Victron inverter AC outputs for switching between inverter and shore power or generator at 120V or 240V. The VE Transfer Switch handles higher power loads at 5KVA or 10KVA and is designed for larger Victron MultiPlus and Quattro installations at 200V to 250V.
Can I Use A Cummins Transfer Switch With A Non-Cummins Generator?
The Cummins RSS and RA Series transfer switches are electrically compatible with most standby generators. However, automatic start and stop signaling between the transfer switch and generator is optimized for Cummins Onan generator sets. Check compatibility with your specific generator before ordering.
How Fast Does The Victron Filax 2 Transfer Between Power Sources?
The Filax 2 transfers in under 20 milliseconds, which is fast enough to maintain operation of most sensitive electronics and prevent connected devices from resetting or losing data during the switchover.
What Size Transfer Switch Do I Need For A Whole-Home Standby System In Canada?
A typical Canadian home with a 200A electrical service requires a 200A transfer switch. Larger homes, farms, and small commercial buildings with higher load requirements should use a 400A transfer switch such as the Cummins RA412N3.
Does Volts Energies Ship Transfer Switches Across Canada?
Yes. All transfer switches ship nationwide across Canada. Free shipping applies on orders over $297.
