This surge protector (56424) can be viewed as a basic model, simple light indicators for dual line circuit testing with surge protection.
Item# 56422 is from the same manufacturer but is microprocessor controlled, has a digital display that shows voltage(s), current frequency, error codes. High/Low voltage protection, time delay for A/C compressor etc.
A rough analogy would be a standard function calculator to a scientific graphing calculator. At the core, they perform the same task, but one has much more advanced features.
by Camping World – June 30, 2015
The Smart Surge 240V/50A provides 5-mode, 1,650 joules and a rating of 45,000-amp surge current.
If you wish to share feedback with us about product selection, pricing, ordering, delivery or other customer service issues, please do not submit this feedback through the Question & Answer Service. Please contact Customer Service at 1-888-626-7576.