The Siemens 3RV1975-5GA0 is a set of phase barriers designed for SIRIUS 3RV1 motor-protective circuit breakers in sizes 6 and 7. Each barrier is 100 mm long, and the pack contains 6 units — enough to isolate phases across two 3-pole breakers or one 6-pole arrangement. They snap into the breaker footprint to maintain air-gap creepage distances between phases after wiring, which is critical for maintaining the rated insulation voltage of the host breaker.
Integration Note
These barriers mount directly onto the 3RV1 breaker terminal area — no additional hardware. They separate the incoming and outgoing conductors, which is especially relevant when using ring-tongue or fork terminals that could otherwise creep toward an adjacent phase. For a panel builder wiring a bank of SIRIUS breakers on a DIN rail, fitting these barriers before torquing the terminals saves rework.