This switch offers a number of unique features, the highlight being the patented Contour Locking System, allowing it to be a stand alone unit, or locked together with other switches. The control knob can be removed by switching to an counterclockwise 45 degree position. This control knob also features an interchangeable labeling system allowing a full range of applications (Item # 713 or 715). Three removable side plates provide access of up to 1/0 cables. The rear cover insulating the rear terminals against any short circuits. This ensures that the switch meets ABYC requirements. BEP Marine Battery Switch Test Procedures (UL 1107) Continuous (1 hour), intermittent (5 minutes) and Cranking (engine starting - 10 seconds). The test is to determine the maximum current the switch can handle for the stated time, without the rear terminals exceeding 100 deg C (212 deg F) above the ambient temperature. The continuous and intermittent ratings are tested at 110 percent of specified ratings. All BEP switches are tested Independently to this specification by a 3rd party laboratory.