ASCO 7000 Series Transfer Switch

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#

1. 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
2. Transition flexibility: open, closed, or delayed transition selectable per application within the same frame
3. Withstand ratings: 3-cycle standard, 18-cycle and 30-cycle options for high available fault current
4. Communications: native Modbus/SNMP/BACnet covers every BMS integration scenario
5. Accessories: bypass/isolation, load centers, programmatic load sequencing, ground fault — more options than any competitor

Sizing guide#

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.