bids are invited for supply and installation of castle key interlocks in the incoming and bus coupler breaker panels for , paint the incoming and bus coupler panels for the 6.6kv hwx areval, which includes 3150a, 2500a, and , provide closing and tripping buffers and service for the 3150a2500a1250a hwx areva breaker. this inc , servicing of 3150a2500a1250a hwx areva breakers involves fixing the following issues that may arise servicing of 3150a2500a1250a hwx areva breakers involves fixing the following issues that may arise a problems with the breaker rack in. b problems with the breaker rack out. c issues with the closing spring not charging. d the breaker trips shortly after receiving a closing command. e the breaker turns on immediately after spring charging without a closing command. f the spring , circuit breakers for dc operation total quantity : 36