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W 601 (NGC 6611 601) is one of the handful of known magnetic Herbig Ae/Bestars. We report the analysis of a large dataset of high-resolutionspectropolarimetry. The star is a previously unreported spectroscopic binary,consisting of 2 B2 stars with a mass ratio of 1.8, masses of 12 M$_\odot$ and6.2 $M_\odot$, in an eccentric 110-day orbit. The magnetic field belongs to thesecondary, W 601 B. The H$\alpha$ emission is consistent with an origin in W601 B's centrifugal magnetosphere; the star is therefore not a classical HerbigBe star in the sense that its emission is not formed in an accretion disk.However, the low value of $\log{g} = 3.8$ determined via spectroscopicanalysis, and the star's membership in the young NGC 6611 cluster, are mostconsistent with it being on the pre-main sequence. The rotational periodinferred from the variability of the H$\alpha$ line and the longitudinalmagnetic field $\langle B_z \rangle$ is 1.13 d. Modelling of Stokes $V$ and$\langle B_z \rangle$ indicates a surface dipolar magnetic field $B_{\rm d}$between 6 and $11$ kG. With its strong emission, rapid rotation, and strongsurface magnetic field, W 601 B is likely a precursor to H$\alpha$-brightmagnetic B-type stars such as $\sigma$ Ori E. By contrast, the primary is anapparently non-magnetic ($B_{\rm d} < 300$ G) pre-main sequence early B-typestar. In accordance with expectations from magnetic braking, the non-magneticprimary is apparently more rapidly rotating than the magnetic star.

NGC 6611 601: A hot pre-main sequence spectroscopic binary containing a centrifugal magnetosphere host star