⚡ UL 1008 Open vs Closed Transition ATS (100A-4000A), Short Circuit Withstand kA

Automatic Transfer Switch (ATS) Calculator

Size commercial Automatic Transfer Switches (ATS) under UL 1008 & NEC Article 700: evaluate Open Transition (break-before-make) versus Closed Transition (make-before-break zero-interruption for hospitals and data centers), continuous frame ampacity (100A to 4000A), withstand closing ratings (WCR 65-100 kA), and electrical contracting profits.

1. Project & Operating Inputs

Emergency Connected Load (Amps e.g. 1,200A 480V 3-Phase)

Available Short Circuit Fault (kA RMS e.g. 65 kA Available Fault)

Customer Bid Price for Supplied & Connected ATS ($ e.g. $38,500)

UL 1008 ATS Switch, Microprocessor Controller, Power Cables & Labor ($)

2. Financial Breakdown & Yield

UL 1008 AUTOMATIC TRANSFER SWITCH

Turnkey ATS Installation Profit

Emergency Electrical Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost