ABB phase rails enable the safe and economical cross-wiring of circuit breakers, residual current protection devices and other modular installation devices. For correct phase rail selection, the following must be observed: Terminal type (double terminal or cage terminal), number of terminals (1, 2, 3, 4, 1+N or 3+N), Device type (circuit breakers, residual current protective devices or modular installation devices), combinations of the different device types, use of circuit breakers with auxiliary switches mounted on the right and bottom, phase rail cross-section (current carrying capacity), number of modules (selection of standard phase rails or abbreviated phase rails)
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