- 1Normal source
- 2Emergency source
- 3Transfer controller
- 4Load terminals
Automatic Transfer Switch
Transfer switches that hand the load from utility to generator and back, automatically. Open, delayed or closed transition, with bypass-isolation for maintenance. 100 – 4,000 A.
From Utility to Generator, Hands-Free
The transfer switch is the decision-maker in a standby system. Its controller watches voltage and frequency on both sources. When the utility fails, it signals the generator to start, waits for it to come up to speed, then transfers the load. When the utility returns and stays steady, it transfers back and lets the generator cool down. Delayed transition protects motors from out-of-phase reclosing; closed transition avoids any blink on the return.
- Microprocessor controller with event log
- Open, delayed or closed transition
- Generator start contacts and exercise timer
- 3-pole or 4-pole (switched neutral)
- Bypass-isolation option for maintenance without outage
- Stand-alone or built into a switchboard
Automatic Transfer Switch in plain words
What it does
Watches the utility supply and, when it fails, starts the generator and switches the load over — then switches back when the utility returns.
Pick it when
- You have a standby generator
- Emergency or life-safety loads must come back within seconds
- The building code or CSA C282 applies to your emergency power
Better choice if…
You have two utility sources rather than utility plus generator
See the Main-Tie-Main →What's Included
- Mechanically held, double-throw transfer mechanism
- Source sensing on all phases
- Adjustable time delays
- Manual operating handle
- Remote annunciation contacts
- ANSI 61 light grey powder coat (custom colours available)
- +Bypass-isolation construction
- +Closed-transition transfer
- +Integral overcurrent protection (service-entrance rated)
- +Load-shed contacts
- +Communications to BMS
Full Specifications
| Parameter | Value |
|---|---|
| Rating | 100 – 4,000 A |
| Voltage | Up to 600 V, three-phase |
| Poles | 3-pole or 4-pole |
| Transition | Open, delayed or closed |
| Enclosure | Type 1, 3R or 12 |
| Tests | Full transfer and re-transfer sequence tested before shipment |
Built to Standard
Where It's Used
- Hospitals and long-term care
- High-rise residential life-safety systems
- Data centres and telecom
- Water and wastewater
- Commercial standby power
From design and specification through factory testing, commissioning, and ongoing maintenance — CANDRON delivers at every phase.
- Engineering drawings and coordination studies
- Factory acceptance testing (FAT) with full reports
- Site commissioning and protection settings
- Spare parts, training, and maintenance support
Common Questions
Use a 4-pole (switched-neutral) switch when the generator is a separately derived system with its own neutral-to-ground bond, so ground-fault protection works correctly on both sources. Your engineer’s single-line will tell us which.
Ready to Spec
Your Project?
Our engineering team responds with specs, lead times, and pricing the same day. Tell us what you need:
- Ampere rating and voltage
- Number of poles
- Transition type
- Service-entrance rated or not
- Generator size
Send us your project details and we'll respond with a price, lead time, and any clarifying questions — typically within a few hours.
Request a Quote →Or call +1 (647) 616-2595Often Compared With
Jump to any product
- Distribution Switchboard400 – 4,000 A · 600 V
- Service-Entrance Switchboard400 – 4,000 A · 600 V
- Main-Tie-Main1,200 – 4,000 A per main · 600 V
- Utility-Metered400 – 4,000 A · 600 V
- Integrated SwitchboardUp to 4,000 A · 15 – 500 kVA transformers
- Transfer Switch100 – 4,000 A · 600 V
- LV SwitchgearUp to 6,000 A · 600 V