Rotary Handles – Interlocking Type To be fitted directly to the NZM1 range of MCCBs. To be used with an extension shaft for through panel operation Shafts are available separately: 454-8281 (400 mm) and 454-8297 (600 mm) Note Please check compatibility of accessory with MCCB. Moeller - MCCBs & Accessories All units have variable sensitivity and 3 pole control.