For Applications with Metering and Relays. Proudly Made in the USA, the Specific Breaker Mounting Current Transformer Model SB6510 is  fully encapsulated for indoor and outdoor applications, with a window diameter of 6.50 and a standard 5-amp secondary. Others available. The SB6510 has a mechanical rating of 180 X Normal and a theraml rating of 80 X Rated Current, 1 Second. This transformers 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 wieghs in at approximately 31lbs.