Proudly Made in the USA, the Specific Breaker Mounting Current Transformer Model SB6510A is fully encapsulated for indoor and outdoor applications, with a window diameter of 6.50 and a standard 5-amp secondary. Others available. The SB6510A terminals are brass number 10-32 UNC with one flatwasher and lockwasher accessible from either side. CSA Optional. 3 Mounting holes with .560" Diameter. This model weighs in at approximately 31lbs.