The CBCT-310-1 from Altech is chasis mount closed toroid (310mm) for current leakage protection with 30A current rating and wire leads termination. This toroid has 1000 primary : 1 secondary turns ratio and 1:1000 current ratio. Dimensions of this toroid are: 14.843" L x 2.559" W x 14.961" H (377.00mm x 65.00mm x 380.00mm). Operating temperature range is from 0 to 55°C (32 to 131°F).