Surge and Overcurrent SHORTS: UL 1077 vs. UL 489 – Phoenix Contact

http://www.phoenixcontact.com/shorts UL 1077 and UL 489 are two standards used to test overcurrent-protection devices. These products each have their own unique characteristics and use. This video explains some of these differences.

• #فناوری_و_رایانه
• #breaker
• #overcurrent
• #circuit_breaker