CB Pluggable Circuit Breakers Phoenix Contact CB Pluggable DIN Rail Circuit Breakers offer thermal-magnetic and electronic circuit breakers designed to plug into a DIN Rail mounted base. The compact design features push-in wire termination technology and precise nominal current levels. A Selective Fuse Blow (SFB) trip option is available for the thermal-magnetic type, and visual status with remote reset / On-Off controls are available for electronic type. SFB technology triggers standard circuit breakers magnetically and quickly to provide up to six times the nominal current for 12ms. Supply / remote signaling can be bridged with CLIPLINE complete accessories. The bases are also available with a UT screw termination.