Square D Meter Centres provide a compact and versatile metering and distribution centre for today's residential, commercial, and industrial markets. Meter centres now feature new combined 125/200A stacks in one sub-service as well as 3-high 125A 4 and 5 Jaw stacks. No other metering system provides the same advantages of in stallation convenience and subsequent time-saving economy. All meter stacks are designed for CSA Type A “cold metering” in which the individual sub-service breakers are connected on the line side of the meter sockets thereby protecting the meter and all electrical equipment installed subsequent to it. This replacement meter socket kit is for use with 7-jaw 100 ampere meter sockets. Square D meter centres are CSA listed.