The SENTRON 3VA1110-1AA46-0BF0 is a 4-pole switch disconnector rated at 100 A, built on the IEC frame 160 platform. It provides visible isolation for a circuit without overload or short-circuit protection — it's a disconnect, not a breaker. The integrated undervoltage release (24 V DC) drops the switch if control voltage is lost, and the auxiliary switch plus trip alarm switch give feedback for PLC or status lamp circuits.
What the ratings mean for fit
The 100 A continuous rating is the key selection number — it's sized for a 100 A feeder or branch disconnect. The 4-pole configuration (3 phases + neutral) suits TN or TT systems where the neutral needs switching. Clamp connections on the main circuit mean stranded or solid copper up to the terminal range, typical for panel feed-throughs. The undervoltage release at 24 V DC holds the switch closed; if the DC supply drops, the switch opens — common in emergency-stop chains or safety circuits where loss of control voltage must isolate the load.
Panel integration and mounting
This mounts on the standard DIN rail in the enclosure. The IEC frame 160 footprint is a known size — 4-pole unit occupies roughly 140 mm width. Clamp terminals face forward, so wiring from the gland plate is straightforward. The undervoltage release coil draws from the 24 V DC bus; verify the power supply can handle the inrush when multiple releases are paralleled. The auxiliary and alarm switch terminals are separate — wire them to the PLC input card or a status indicator.