Overview#
The ASCO 7000 Series is the most widely specified automatic transfer switch in North American commercial/industrial power. Manufactured by ASCO Power Technologies (now Schneider Electric), it covers 30A through 4000A in a single product family — from small retail loads to hospital mains and data center distribution.
When an engineer writes "transfer switch" on a spec sheet without a brand preference, the electrical contractor quotes an ASCO 7000. It's the default for a reason: universal familiarity, broadest accessory catalog, proven field history across millions of installations.
Why the 7000 dominates#
- Range: 30-4000A from one product family means one spec, one training program, one parts ecosystem for an entire facility regardless of how many ATS it needs
- Transition flexibility: open, closed, or delayed transition selectable per application within the same frame
- Withstand ratings: 3-cycle standard, 18-cycle and 30-cycle options for high available fault current
- Communications: native Modbus/SNMP/BACnet covers every BMS integration scenario
- Accessories: bypass/isolation, load centers, programmatic load sequencing, ground fault — more options than any competitor
Sizing guide#
| Application | Typical size | Transition type |
|---|---|---|
| Small commercial (restaurant, retail) | 100-200A | Open |
| Medium commercial (office, multi-family) | 200-600A | Open |
| Hospital (emergency branch) | 400-1600A | Closed |
| Data center (distribution) | 800-3000A | Closed |
| High-rise (life safety) | 400-1200A | Open or closed |
| Industrial (process) | 600-4000A | Application-dependent |
Selection criteria#
- Amperage: match to generator output amperage at operating voltage
- Voltage class: 480V is standard commercial; 208V for smaller; 600V for industrial
- Transition type: closed transition costs more but provides zero-interruption transfer
- Withstand/closing: must exceed available fault current at ATS location
- Bypass/isolation: required for mission-critical (hospital, data center) where maintenance can't interrupt power
- Communications: Modbus minimum for modern BMS integration
Our service experience#
The ASCO 7000 is installed at the majority of our commercial service accounts. We exercise these switches during annual preventive maintenance: verify transfer timing, check contact condition, test controls, and verify communication with the generator controller. The most common service issue: contact erosion on high-cycle switches (monthly exercising over many years wears contacts) and occasional solenoid coil replacement. Parts are always available — ASCO maintains the largest ATS parts inventory in the industry.